[ABDL, Diaper Use, Mental Regression, Diaper TF]

After saving Humanity from being incinerated by the machinations of the Demon God King Goetia, the Chaldea Security Organization was in a bit of a pickle. Not because they weren’t effective at what they did, but precisely because of that.

Due to everything they had encountered, going from one Beast to the next and having several smaller singularities appear after they disposed of the main threat, it never seemed like they were in the clear. They always had something to do, and since they had done such a swell job of it all, they were the first ones anybody thought of when new issues arose.

“Aaaah… Mordred…” Not that it concerned Fujimaru Ritsuka, the young Master who had been at the front lines the entire time that much. He was too busy daydreaming about one of the beautiful Servants that had helped him during his journey, especially the body underneath that wicked armor she wore…

Walking carefully at his side was a brown-haired woman, who just shook her head in response to his idle dreaming. “Ritsuka, you really have to start getting your head outta the gutter. You’ve been trying for how long to get her to come to your side, and she still hasn’t appeared?” The woman sighed as she pushed her small spectacles up on the bridge of her nose…

“But Da Vinci, I really want Mordred! Didn’t you see what happened in London, how we got saved by her reckless use of Clarent?” The black-haired young man’s fist clenched in frustration, a bit of quartz-dust falling out of the cracks between his fingers. “I just want these to pay off and give me the chance to see…”

The Caster-class Servant that accompanied him, Leonardo Da Vinci, continued shaking her head in response. “Breaking your Quartz won’t make her come out faster. It’ll make them even less durable and prone to summoning the wrong Servant. Especially since Mash’s shield is in its current condition…”  She mused, the glasses on her face growing foggy to hide her worried eyes.

“But I really, really want Mordred, Da Vinci! Can’t we do something to get her guaranteed? I’ve spent so much money, so many quartz, and all I’ve got to show for it are all these tittied girls that aren’t Mordred! Come on, you’re a genius inventor, surely you must have an idea or three to make it happen?” Ritsuka bemoaned the situation as he wrapped his arms around the busty woman, squeezing into her side as he pouted like a needy puppy. “Pleaaaaase? Pretty please with sprinkles on top?”

Da Vinci let out the deepest sigh that she could as she looked down at him. She had a soft spot for utterly useless boys like him, especially the ones that came begging at her feet for a hand or an invention that could turn their life upside down. Back in her day, when she was still a man, she had frequently done whenever she wasn’t trying to paint. So to return to the oldest profession she had and doing good with it… Eh, it was worth a shot.

“I may have something that can help, but you have to promise that you’ll help me with something in exchange, Ritsuka. Only then will I help you summon Mordred, alright?” The brunette Servant said, slowly removing his arms from her body before bopping him on the nose in an affectionately teasing fashion. “And just because you buttered me up, I’ll even do it with you needing to use a single Quartz. How’s that sound?”

Ritsuka’s eyes lit up with glee as he nodded rapidly. “I’ll do anything, Da Vinci! Just tell me how and I’ll do everything I can to help!” He chimed, rapidly bouncing up and down like an overly excited child who finally got to try the toy that he always wanted to play with. One of the quirks that had admittedly endeared a lot of Servants towards him was his honesty and how happy he was whenever things went his way, just like this.

“Very well!” Da Vinci announced with gusto as she pulled the boy along, yanking him into a special hallway that only she knew about. “To attain the presence of your beloved Knight of Betrayal, I must first request that you lend me your Command Seals, so that we may summon something beyond the power of a regular Servant! Something that can protect this world from any threats that may arise!” Her words boomed as they approached a very special door, crudely covered up by a lot of different signs…

The boy blinked a couple of times as he looked at the extravagant Caster. “Ooookaaaay? What do you need them for? How’s it going to help me try and get Mordred?” He asked the obvious question, though not before holding out his hand so that she could temporarily borrow those seals.

“Be patient, and all of your questions will be answered!” The Caster laughed as she ripped the shoddy signs off the door, before entering with the boy in tow. Almost immediately after they stepped into the room, the floor and walls started to flash brightly, revealing leyline-like patterns that made it look like an almost identical replica to the normal room that was powered by the Shielder Servant’s shield…

Ritsuka looked around a little, wowed by the appearance of the room. “You made a second summoning room? But how? Don’t you need a place for heroes to gather or something, like the round table that Mordred’s at? That’s what Dr. Roman said when he was around, and…” He paused, feeling a little sad over bringing up bad memories.

Not that he was allowed to stay sad for long, as a hand fell upon his shoulder. “Not to worry, this doesn’t need that in the slightest! This is merely a replica of the design with only about 75% of the functionality!” Da Vinci explained as she held her gauntlet-covered hand forth, a small glyph building on the palm. “Thanks to my potent research on the subject of Mash’s shield, I’ve been able to come up with a device that works in a similar fashion. But with a key difference in terms of the internal logic. Instead of the magic powering it serving to light a beacon for heroes to gather, it is more like a conveyor putting the parts together to form a complete product!”

All of that information went straight in through one ear and out the other, as the black-haired Master just stared at the excited brunette. “Aaaand all of that meaaaans, in plain human speak?” He asked her to simplify it, since he never did understand her words whenever she got too in depth. It was basically a bunch of nonsense.

“In essence, this manufactures a Servant instead of summoning it. All of the body and strength that comes with it, none of the will that steers it. We’ll be able to protect ourselves with autonomous and easily controlled copies of Servants, just in case we end up fighting another Beast! Heck, because of the particulars with this system, we might even be able to summon one! Doesn’t that sound fantastic, Ritsuka? Endless firepower, none of the stress!” The Caster explained it all in detail that he could understand this time around, a light shining in her eyes.

He just kept on staring at her, not very impressed. Or rather, he was, but it still didn’t give him what he wanted. “So you could make a Mordred with none of the bits that make Mordred great.” He said with a dull tone, as he slowly started turning towards the door, the color draining from his face. “Why’d I get my hopes up…”

“Now now, you can’t just brush me off like that, Ritsuka! You promised that you'd help! Besides, this isn’t how I’d summon Mordred, I know you’re attached to the personality and the gusto, not just the power!” Da Vinci grabbed him by the shoulder and yanked him back, causing the boy to spin around from the power in her grip. “Listen. Just stay here while I activate it, and I’ll help you afterwards. Got it?”

Ritsuka nodded with his expression still permanently stuck in disappointed and downtrodden as he thought it really wasn’t worth all of that. Even if they did manage to summon a Servant, it’d just be a mockery of one that didn’t know left from right. Because it was a machine, not a genuine person.

The Caster pushed her glasses up once more as the glyph on the palm of her hand activated, a glint piercing through the fogged part of the lens. “VULCAN, ACTIVATE!” She cried out, as the ‘forge’ that was the summoning room started glowing with even more power than it already was.

All while the boy thought it was far too bright for him. He had given the woman what she needed, so he didn’t need to be there. He just quietly slinked his way out of the room, not looking back as the sounds of the machinery in the room intensified…

Da Vinci didn’t even notice that he disappeared, as she was far too busy admiring all of the magic swirling around her. The seals that made up the glyph on her hand were powering it all, doing much more than any shield would be able to. With all of this Mana gathered, it would be easy for her to mass produce Servants. She just needed to keep it running, and then-

Just as she thought she had it, the glyph disappeared. Because of the boy leaving the room, the seals returned to him as the rental range was too small compared to the distance between the two. And because everything was already in motion, it couldn’t stop. Thankfully, the main part of the machine that the glyph controlled was the parts that maintained the process, not the process itself.

A look of worry coated the brown-haired woman’s face as she pushed her glasses up, the lights in the summoning room quickly turning red and dangerous as the machine started going haywire. “Maybe I should’ve just summoned Mordred for him first, so he would’ve been a good boy and listened to me…” She mused as she was consumed by the light…

“ERROR, ERROR, ERROR, ERROR, ERRO-”

The machinery whirred to a halt, not because it had been broken, but rather because it had finished what it needed to do. All while the creator of the machine remained partly blinded, thanks to the light still lingering. Judging by the air inside the machine however, it had managed to do exactly what she wanted it to, as she could feel the presence of another being, one much stronger and more solidly incarnated than herself…

Upon opening up her eyes, Da Vinci felt a bunch of emotions swirling together into an incomprehensible cocktail. Worry, fear, delight, astonishment… But most importantly, pride. She was proud that her machine had worked, especially as she looked up at the being in front of her.

Standing tall with massive horns that reached all the way down to her hips was a woman that she had once faced off against. A woman that had given her and Ritsuka way more trouble than any other Servant that they had ever faced off against. Arguably more so than the Demon God King himself.

Tiamat. The Mother of Monsters, but more appropriately, the Beast of Regression. Beast II, the same woman that had submerged most of Babylonia in her essence, turning its inhabitants back to primordial beastly forms that were barely recognizable as anything close to an animal. The teeth and those elongated tentacle-like limbs… It wasn’t a fun time to think back on.

But there was something wrong about this horned lass in front of her. Not only was she a bit taller than she was supposed to be, not as much an issue as she wasn’t in her proper full-sized beast form, but she was also completely covered in a metallic sheen. In fact, she wasn’t fleshy at all. Every part of her was made out of various metals smashed together to make a robotic shell that looked just like the real thing.

“Well then. That wasn’t what I planned, but I’ll take it! One Beast, ready to be used as we see fit!” Da Vinci exclaimed as she knocked her finger against the metallic Beast’s knee, amused as it sounded as thick as it should. It was just as thick as it should sound, meaning that it wasn’t just a hollow shell proper. Everything was filled out, which would lend itself great in proper combat.

Of course, there was a nagging sound in the back of her mind. Namely, why did she turn into a robot? More than that, were those cross-shaped irises of hers following her? Nah, she had to be seeing things. There couldn’t be a will inside that thing, she was sure it was just artificially created using the machine! There was absolutely no way that this could’ve backfired on her in some spectacular fashion.

“Now, how do I get you out of here, without breaking you or causing the others to think you might be a threat to us…” The inventor muttered to herself as she rubbed away at her chin with her mechanically-augmented hand, stroking those fingers along her cheeks. “Hmmm. You’re too big to fit out of the door, something I should fix for any future summons, and you…” She paused as the light turned on inside her head, causing her to giggle.

Of course, she had forgotten the most important part of it all. She could just check the big gal’s stats and see if she had some sort of nice ability that would help her move around. She was a machine after all, and the Caster had made plenty of machines in her lifetime. Sure, none of them had seen proper use and only served to conceptualize the further development of technology, but that still meant she had the proper mind for this kind of stuff.

Da Vinci brought up a screen depicting the larger Beast’s stats, quickly scrolling through them to try and find what she needed, only to find that most of her stats were either nil values or outright bugged. “What? Oh, come on. You can’t tell me this is where everything screwed up? She’s just a big hunk of metal that can’t do anything?” The inventor’s mood immediately went down the shitter as she kept scrolling, flipping through tab after tab as she tried to find something to tie all of this together. She needed this, she needed to prove that all of her research and development hadn’t just been for nothing.

As she kept on scrolling through the options, she swore she heard a different whisper echo through her ears. Something soothing, much more pleasant compared to the worried voice in the back of her head. So soothing that she almost felt her eyes close right then and there, before she quickly whipped back to attention, a bit of sweat running down her face…

“What was that?” She asked, looking around the room to try and find the source of the sound that just disappeared. Was it the harmonics of the machine malfunctioning, playing some sort of tune so that it could turn her into mana and refuel itself? She had included something like that in the design, just in case they ever needed to go to some extra extreme length, but that couldn’t be it, there was no sign that the machine had started back up.

Da Vinci’s eyes then turned towards the mechanical Beast, eyeing it with a suspicious glint peering through her glasses. “Was that you, Tiamat? Are you actually aware of your surroundings or something? Or are you just…” She mused aloud, punching the oversized woman’s thigh… only to wince as the metal was definitely too hard for her to handle. Leave it to Servant enhancements to make something way worse than it was in life. “D-Damnit, should’ve just slapped it instead…”

The Caster blew on her throbbing knuckles, only for that strange melody to grace her ears once more. It was calm, almost like the song of a sea animal. The kind that lured you out to the waves and drowned you in the depths of the ocean, once you lost your footing on reality. She had heard it once before, it managed to lure in a couple of other Servants during the excursio…

Her eyes widened and flickered between wide awake and nearly about to pass out. She realized what the source was. It was Tiamat! It really was her! She was somehow producing the Whale Song, but this time it was even more potent! Even as she tried to cover up her ears with her hands, it managed to slip straight into her mind, bypassing her senses and captivating her in mere moments. “N-No, I can’t…”

She knew better than to let this happen. Because of her attempts to mess around with the summoning system, she had called upon a variant of a Beast. Not one without an ego, to her dismay, but one with a full replica of that wicked creature’s self. She had to do something, she had to escape and call upon her Master, but…

The more Da Vinci tried to walk towards the exit, the less her body responded to her. Slow steps turned into an ordeal, forcing her onto her knees as she desperately tried to waddle like some sort of penguin or stumpy-legged creature. Even that didn’t last, as it exhausted her further and further, forcing her to get down on all fours and abandon her attempts to shield her ears.

It seemed so far away, yet it also seemed like she had been crawling for what felt like eons. Eventually, the Whale Song reached her mind and wrapped around it completely, causing all resistance to leave her as her eyes lulled themselves closed, the woman carefully laying down on the pristine floor below, with only a single word leaving her lips…

“Ritsuka…”

---

Slowly but surely, Da Vinci felt her energy returning to her. After everything that had just occurred, she was surprised that she could move at all. That Song had managed to drain her energy to its very limits, and she never imagined that she would move again.

Of course, as she looked down at the floor and noticed that it was decidedly softer than it probably should be, she realized that she wasn’t in the clear. Far from it. Especially as her hand nearly sunk into the floor, almost as if it was made out of some sort of pillow-y material instead of being firmly secured with wood or stone underneath to give it some sort of foundation…

“Where… Where am I?” She muttered as her senses slowly returned to her, being careful the next time she put her hand down on the floor. She made sure that she used the least amount of pressure that she possibly could while taking a look around her, squinting since her glasses were currently gone. She didn’t need them, but she did need to readjust…

She could feel a touch of worry filling her heart as everything around her had a decidedly cheery and pastel look to it. It was very unlike the summoning machine that she had passed out inside. In fact, she was sure that there wasn’t anything like this in any part of the complex that she had spent the last two years inside, so…

“Good morning, little one.” A soothing voice, comparable to the Whale Song that had drained her, rushed through her ears. It prompted the brunette to quickly lose her grip, falling onto her tummy as she tried to spin around and peer straight up at the source of the voice…

It was Tiamat. But this one wasn’t made of metal, this one was the real deal. So real that she could actually speak, and even smile down at her with the maternal aura that one would expect from a mother of her fame. Even the look in her cross-irised eyes was warm and loving, totally unlike the enemy that she had once faced in Babylonia. She wore a warm apron too, one that had a bit of adorable yet utterly foreboding text written on it. ‘Kiss the Mommy’…

“T-Tiamat… It really is you!” Da Vinci chimed, feeling the excitement and pride fill her heart once more. Even though she was in immediate danger, it was time to celebrate! She had summoned a Beast, and even improved upon her! She could speak! That was way better than the weird thing they fought in the past!

As she celebrated by rolling around on the floor like a little excited flea, the horned Mother nodded slowly. “You’ve done a most wondrous feat, little one. You’ve managed to incarnate me into the present, with my mind intact.” She chimed, every word that left her delicate lips having just as much of a soothing effect as her song, though a little less potent thanks to the non-continuous stream of her speech. “However…” She paused, as her gaze turned a little less warm.

“Girls like you should know much better than to disobey the rules of the world.” She said firmly, floating gently towards the girl as her voice hid a tinge of disappointment. “You know the dangers of my kind. Beasts are not to be summoned by Humanity, as they are threats to be vanquished. Yet you’ve tried to do just that. Without even thinking about the consequences.”

Tiamat’s words fell on deaf ears as the girl underneath was too busy rolling, despite the cold chill that her glare gave her. “I can’t wait to tell Ritsuka that it actually worked! We’ve got the original Mother on our side, we’ll be able to defend humanity no matter what the world might try and throw at us! It’s just what I always wanted!”

“...So, you embrace your own terrible pursuit. Regardless of where it may lead you. No matter who might try to dissuade you.” The gentle voice’s hidden anger slowly bubbled its way to the surface, as she landed firmly on the ground below, with her hands in reach of the girl.

Da Vinci was quickly scooped up into those large, maternal arms. Something that would’ve been wonderful, if not for what came right after. Her pants being yanked down, bringing a blush to her face before a firm and flat hand met her cheeks with so much strength that both flushed red as they throbbed. “W-Wh-OW! D-Don’t do that!”

“Please listen, the next time I scold you for actions you should’ve never thought about taking.” Tiamat explained as she slowly rubbed her fingers along those painfully throbbing surfaces, humming softly to keep the girl from doing much to fight back. That calm overwhelmed her, keeping her exactly where the Mother wanted her…

As more and more of that song sunk into her head, it mixed together with the painful sensations piercing through her from her butt. Sensations that slowly but surely dulled, thanks to the healing effects of the maternal Beast’s abilities. There was just one tiny caveat about that healing process…

“...H-How’d I…” And it didn’t take long before Da Vinci realized what was wrong, as she tried to think about how she ended up in this mess in the first place. In fact, everything she had worked on for the last month or so had drained into her bottom, serving as the magical salve that repaired the damage. A small price to pay for a lack of pain, and a show of the power that the Mother had at her disposal…

Tiamat looked down at the young woman in her arms, smiling serenely. “The punishment fits the crime. You will no longer be able to summon anything you shouldn’t. Lest you accidently saddle our Master with something he wouldn’t be able to deal with.” She explained very carefully, as she bopped the inventor on the nose with her pointer finger. “Be glad that I did not go farther than that. Unless you wish to test my patience, I would suggest that you act on your best behavior…”

It would be an understatement to say that the brunette considered this any sort of proper arrangement. She was basically a toy for the Beast to play with at this point. How could she trust her? She could eat her or turn her into a monster in a second if she wished, so there was no point in staying allied with her in any capacity!

Da Vinci did her best to try and struggle free from the larger woman’s grip, but that only caused her to tighten it instead, which in turn made the air leave her lungs rather quickly. “Oh, you wish to be a difficult child? Very well. I know how to deal with problem children. Kingu knew that much, even back in Babylonia.” She said as her gentle tone was replaced with a barely contained veneer of disgust for the woman, now that she had proven that she wouldn’t accept her gentler behavior…

Instead of getting a chance to go free or getting a second to breathe and think things through, the poor woman was forced over to a changing table, which also made things click for the brunette. She was in a nursery. Tiamat’s personal nursery. Why did she have one? It didn’t matter, she just didn’t want to be there! She wanted to be free and call on her Master, the young man who had done so much. Surely he could help her, right?

Her attempts to escape died down quickly as the maternal Beast’s Whale Song went through her ears once more, draining her of just enough energy that she couldn’t move her limbs. Her eyes remained open, as there was still enough for her to stay awake. Though, she would’ve probably preferred if they were closed at this rate.

The older Beast carefully ran a hand through her hair as she laid her down on the table, while the other hand reached for something even more embarrassing than all of this treatment. A thick-looking diaper, decorated with a bunch of adorable little Lahmu. As expected of their mother, she loved those children even if they were basically beasts in their own right.

Once again the young woman’s choice to resist was taken away from her, as Tiamat openly hummed her Whale Song as she lifted her legs into the air. With those things out of the way, and with her energy at an all time low, it was especially easy for her makeshift caretaker to slide the diaper underneath her butt, before then wearing the middle through the gap between her legs and then shutting it snugly with the tapes…

“S-Stahp…” Da Vinci tried to protest, but thanks to the numbing and energy draining effects of the Whale Song, all she could muster was a bit of a weak and drooling protest. She couldn’t even swing her arms, and her legs were far too spread apart by the diaper that reached all the way down to her knees. She looked utterly pathetic, no matter what she tried to do.

Her maternal Beast caretaker shook her head. She just kept on singing, keeping the poor girl subdued as she removed the rest of her clothes, since a baby like her who was excited to ruin the life of everyone around her just to try and pursue a lucky break… She needed to be punished appropriately and shown that she wasn’t anywhere close to being a real big girl.

Instead of the existing and ornate steampunk-ish dress that she wore, she was given a much simpler and frill-heavy dress that exposed everything despite how big it was. It had a cute cleavage window near the top, because babies didn’t care about their breasts being out in the open, and the skirt itself was far too small to actually cover up her enormous diaper. She needed to understand that this was all meant for her sake, to make her feel that shame and internalize it. If she didn’t, she’d just end up ruining things for everyone once again…

To complete the look with the cute dress that left nothing to the imagination, her caretaker put a couple of booties and mittens on her feet and hands respectively. Now she wouldn’t be able to get any sort of articulate grip on anything, much less walk. So if she wanted to play with something, she had to be careful and use both hands.

“What a wonderful look for you, little one. You look like I could scoop you up right now, and then we could play so many fun games together…” Tiamat mused, blushing a little as she let her imagination run wild. Ah, playing together with her babies. If only the Lahmu were as cute and as agreeable as this little girl was turning out to be, then people would’ve fallen to them much easier…

Da Vinci slowly but surely tried to stand up on the table, pointing directly at the woman who stood taller than her. “P-Please let me go, I don’t… I’m sorry for disturbing you, I really am. Can’t you just… Please forgive me and let me go…? I promise not to do this again, I really do…”

The maternal Beast looked upon her as she rubbed away at her cheek, humming as her dangerous eyes locked on… Only to giggle, those very same eyes gleaming ever slightly. The smile on her face wasn’t encouraging in any way.

Her little baby tried to back away, just as she felt the effects of gravity growing quite stronger on her frame. She could barely take a single step before her legs gave way, causing her to fall down onto her padded butt and let out a surprised gasp, a blush quickly spreading across her expression…

“You’ve been a difficult child, truly beyond compare. I cannot allow you to leave, not as long as you don’t see things like your Mother does.” Tiamat explained as she slowly wrapped her arms around the grounded girl, lifting her with utter ease. It was too clear that the gravity that weighed her down was something that the Beast had at her disposal, though it was too hard to properly articulate how it worked… Especially as she felt surprisingly warm in the older woman’s arms…

Da Vinci was slowly let onto the ground below, all while her maternal ‘caretaker’ watched her. “As long as you stay in here, you may do anything. Play with the toys that fit your new role, as one of my beloved children.” The older woman said, as she slowly took a seat, a lahmu-themed rocking chair forming out of nowhere. She had to keep a close eye on her, after all…

The Caster-class Servant and world-renowned engineer, reduced to a little girl in a dress that was fit for an infant, complete with an oversized diaper that really dug into her feminine curves. It didn’t give her any kind of confidence, but she didn’t want to risk another punishment. Especially considering the sheer power that was at the ‘caretaker’s disposal.

‘I have to find a way out of here, by any means necessary…’ It wouldn’t keep her down, however. As much as she knew that her actions could bring her a swift punishment, one that might even be worse than what she had already endured, she wasn’t about to take it lying down. If she could sneak out, perhaps while Momm- Tiamat was sleeping, then she’d be in the clear.

Da Vinci slowly crawled around on the floor, feeling the diaper squishing between her legs and the crinkling reaching into her ears to endlessly remind her of her current predicament. It didn’t help that she had to be very careful with where she put her hands either, because if she as much as put her palm at a wrong angle, the soft-yet-slippery mittens that she wore would give way and cause her to plop her face straight down towards the softly decorated floor below…

As she decided to sit up for a bit instead of crawling around, she looked around at her surroundings. She could see plenty of toys, whether they were rattles, small rings and a peg they were supposed to go onto, boxes with shapes that could go into holes in the boxes… and a cute plush bird in the shape of a comfy and happy looking owl, ready to be snuggled…

“I have a lot of tools at my disposal, and yet nothing that could hold them together…” She mused aloud, subconsciously grabbing the owl and pulling it closer to her. She instinctively gave it a couple of hugs, squeezing it close to her. Not only did it make her feel happy to have some sort of companion, but she could discuss her plans with it, just like when she was trying to build real inventions.

Da Vinci picked up a couple of the blocks, stacking them on top of the boxes with holes in them. She could already see one of her plans coming to fruition, caution her to squeeze her plushie friend harder. “If I just find a way to fire the shapes out of the holes, I could hit Mommy in the head and knock her out, and then quickly run out and get Master! But how do I fire it?” The brown-headed baby girl muttered, rubbing her face against her owl friend a bit more to try and use that brain of hers…

The more she thought, the harder it became to think coherently. Every time her train of thought got going, it would crash off the tracks as she pushed her face into the plush at her side. But she knew it couldn’t be because of that, Mr. Owl made her thoughts take off, so… So…

She blinked ever slightly, looking at the owl at her side. There was something off about it. Whenever she worked on a formula or a schematic during her time at Chaldea, she had a bird at her side, and… this was like that bird, but… A much more childish counterpart, if she had to try and guess. That’s the best explanation her mind could come up with, especially as she did her best to resist snuggling it like the toy that it was.

Da Vinci quickly put the bird away, huffing as she pushed her butt down assertively. She could do better, she could do it without that weird mockery of her favorite avian. She could… Stack! She could stack like nothing else! Stack all the boxes and the blocks and the shapes on top of one another, stack them all the way up until they’re bigger than her!

With infantile determination in her eyes, she stood up on her tippy toes, trying to put the star-shaped block on the top of one of the stacks she had made in a hurry, feeling the ground underneath her getting a bit wobbly. Or maybe it was her body, thrown off balance by the diaper hanging from her waist? Whichever was the case, as soon as she leaned even slightly off to the side-

*Pomf*

She fell onto the padded floor below, her head ending up cushioned by her owl friend. Ah. Why’d she try to stop playing with it, it felt so nice to rub up against, and tell all sorts of fun stories to, and hug and cuddle and trust with all of her heart…

The girl who did her best to avoid the temptation of the plush was falling yet again, as she instinctively gave it all the cuddles and snuggles that it ever could want, if it could even think of loving that sort of stuff. Only as the slightly hard beak brushed up against her cheek did she realize what she was doing, prompting her to look at the towers she had stacked up…

It had distracted her from what was really important! Getting out of here! She couldn’t just focus on making a big pretty tower that actually reached up to the ceiling, because she needed to get out of here faster than ever! If she spent even another second in here, she’d just get dragged straight back in, and… and..!

Da Vinci, in her childish frustration, grabbed one of the blocks from the tower causing the entire thing to topple onto the ground below. She held it with both her hands, making sure that she had a good grip for one, before throwing it as hard as she could in a random direction, not caring who or what she’d hit…

*Bonk*

...That wasn’t the sound of the block hitting a piece of furniture. That was the sound of it hitting somebody on a fleshy bit. Like a tummy. Only to bounce off harmlessly. But that still wasn’t good, because the crinkle-making baby girl knew that there was only one other person in this room, and she wasn’t nice! She wasn’t nice at all!

“Even when I show you the tiniest bit of mercy, you still behave like a naughty one who doesn’t understand consequences.” Mommy Tiamat sighed as she got up from her comfortable rocking chair, causing it to disappear just as quickly as it had appeared. “Little baby, perhaps you’re too small for toys. I will take them off your adorable hands, to ensure that you don’t hurt yourself or others.

Da Vinci’s lips quivered in surprise and shock as several of the blocks disappeared in an instant, with the bigger boxes slowly sinking into the holes, giving her the false sense of hope that she could stop one of them from disappearing. She even tried to hold onto one of the boxes, but it just slipped out of her mittened grasp, leaving her to slowly sob as she watched the fun… t-the distractions… disappear…

Wait. No, there was something much more important than them. And if they were disappearing, then it’d disappear too!

The young-minded girl quickly looked towards her owl friend, only for her eyes to grow wide and wet as she saw it slowly sinking into the floor below. “No! Don’t take away Mr. Owl! He’s my friend!” She cried out in shock, trying to wrestle it out of the hole before it disappeared for good. Her tears even dribbled down her outfit, soaking into her diaper once they got that far down…

Her caretaker noticed the desperation in her eyes as she clung to the sinking plush, smiling as it popped back out of the ground. She was happy with how childish she was acting, it emboldened her actions. Because if this genius couldn’t pull herself together and act like an adult, then people really wouldn’t be able to save themselves.

Of course, what the little girl hadn’t noticed was that the gravity effect on her was still active, but her childish mind growing more ignorant of the things around her made her ignore it. If she just wandered out on her own, without consciously thinking of it, she would’ve probably been able to leave this dream-like world with some of her adulthood still intact…

“Mr. Owl!” Da Vinci happily shed tears for her plushie, snuggling and hugging as much as she possibly could, losing more awareness of the world around her as she did so. It had formed a parasitic bond with her, one that made her more and more dependent on it, and she couldn’t resist. Who could resist such a cute owl plush?

Tiamat giggled as she watched her little baby girl play around with the owl, slowly musing to herself. “If only the rest of Humanity in its current state was like you, the question of ‘if they could protect themselves’ would be so easy to answer... “ She muttered. She wasn’t about to let them all wander around without their parents’ guidance, especially when she could be protecting them and loving them until the end.

Still, she needed to make sure that she rewarded good behavior. As the little-minded girl continued to snuggle away with her toy, she slowly scooped her hands underneath her arms, lifting her up as another toy materialized underneath her. A bigger one, which she could sit down on and fit in snugly. Something made for infants, which she definitely looked like, outside of those oversized boobies sticking out on her chest.

A bouncer. A bouncer that she tried to squirm around in, not because it was unfit for her, but because it was something she was wholly unfamiliar with. It didn’t take long before she became utterly blissful in it however, as she looked up at the cute animals hanging off a pole up above. Something she could push her fingers up against and see them jingle and wriggle and all sorts of cute things like that.

Tiamat smiled as the girl slowly lost herself in her playtime again, taking a seat in her rocking chair as she slowly closed her eyes. She didn’t need to worry about keeping an eye on her, not when she really couldn’t move anywhere. Something that’d become all-too-true the longer she spent in the bouncer…

Da Vinci carelessly started pawing at the toys hanging off the bouncer’s bar, giggling as the jingling sound resounded through her head. It enhanced the feeling of unawareness, completely dulling her to the fact that she was quickly growing on all sides. She wasn’t going to stay fit for the seat for long, especially since she had been such a naughty baby.

Her arms were the first and most obvious to go, as the slenderness and delicacy of those limbs were quickly ruined as pound upon pound of fat started sagging its way down. Not only that, but her fingers, which she had taken meticulous care of ever since she started tinkering with painting and engineering, were now as thick as sausages, ensuring that she had no way of properly holding anything ever again, even if her mittens came off.

Looking further down, the engineer and Caster-class Servant’s legs were the next part of her that had to succumb to the maternal woman’s influence over her. Both of them were pushing out thickly, leaving as little a gap between her thighs as they possibly could. The only thing that kept her from getting even closer was the squishy white crinkly garment hanging off her waist, which also conveniently kept her from causing any part of the bouncer to tear in the process…

Da Vinci drooled a little as she hugged away at Mr. Owl, enjoying the sounds of her toys as she snuggled away. All while her midsection started pushing out, as if a bread was being baked inside. The way it quickly sagged down, as if the dough inside deflated in turn, made it too obvious that it was just a bunch of baby fat that wasn’t going to go anywhere anytime soon. Both because of her Mommy’s magic doing a number on her, and because there was no way she was going to get up and run any time soon. Not with how much she loved the plushie in her arms…

The last piece of her that had avoided a humiliating bout of growth was her breasts, and they pushed out so hard that they had trouble staying inside her outfit. Both of her nipples quickly poked out from the cleavage, as much as they were allowed to at any rate. Both of them had receded, causing the inward nipples to cutely peek out as they grew bigger. Not filled with milk, like the ones hanging off Mommy’s chest, but fat that would be a lot harder to squish into…

After snuggling with Mr. Owl for a long time, the young-minded girl started whispering into its ‘ear’. “Listen, Mr. Owl. We have to get out of here. I’m just playing along until Mom- Tiamat stops looking, and then we’ll make a break for it. We’ll… We’ll run down to the kitchen, grab all the snacks we can fit in you, and then we go! Maybe we’ll find Master and he can give us some nice hugs…”

She wasn’t really whispering. Tiamat could hear her loud and clear. She just didn’t bother trying to stop her this time, because there’d be no way that her little baby girl could get out of her jumper with the kind of physique she now had. Ah, she was a little envious of how well it was going for her. None of her Lahmu, the precious children that they were, could ever end up as cute as she was getting… Maybe she’d have to try and see the next time she materialized, feeding them as much food as she could…

Time ticked on by, Da Vinci’s attempts to discuss her plans with Mr. Owl becoming less and less frequent. The more she thought about trying to get out of her jumper, the more she instinctively sabotaged herself by bumping her plushie’s head up against one of the toys, making her drool and giggle as she heard the funny and cozy tunes from the toys. This process repeated again and again, her drool only growing in abundance as she went through the motions.

All of that changed as she felt a spike of pain rush through her body, causing her to gasp out and groan. It was her tummy, that big thing, trying to scream and shout. All of that growth hadn’t just made her bigger, no, something internally had multiplied just the same. And all of it wanted out, right now. Even if she couldn’t get it out. And she didn’t know how to either, her regressed mind having trouble understanding cause and effect…

Her eyes flew all over the place as she tried to put two and two together, only to notice the Beast rocking back and forth in her chair. “Mommy! Mommy! Help!” She cried out, bouncing up and down in her chair as she tried to get it to stop. But that just made it worse, the pressure slowly pushing out of her tummy and further down…

Tiamat opened her eyes as she heard her beloved baby call for her, causing her to giggle and smile as she stepped closer. “Oh, poor little thing. You’ve got an upset tummy, one waiting for it all to come out…” She mused, correctly identifying the issue. But instead of helping her directly… She just began to make her bounce more, wanting to shake it all loose instead of giving her the comfort she desired. The baby girl was still a naughty baby after all.

Da Vinci could feel it all shaking around down below, and it made her groan and moan and do all sorts of babyish noises, making her genuine discomfort ring out as the pressure kept on increasing. Everything was being tossed around, forced into her infinitely tiny bowels as it slithered further and further downward the more it was teased by her maternal caretaker…

She didn’t want this! She really didn’t want this! Not like this, anyway! She wanted it to stop so she could go back to playing with Mr. Owl and her toys! She didn’t want to make big stinkies! Only babies made stinkies! And she wasn’t a baby, no matter how diapered she was or how much she loved M- N-No, she didn’t love mommy, that wasn’t...

Her mind caught up with her, but it was too late. It was the worst possible time for her maturity to return, as she quickly shut her eyes as the dam was broken down below, a weak squeal leaving her lips as her adulthood was crushed into pieces by the terrifying bowel movement…

The poopy that had been building in her tummy pushed its way out of her hole, spreading that tiny ring as far as it could go. It wasn’t just a little bit of poop, it was a bunch of it, shit sliding out of her hole with wild abandon. At first it was only coiling out like a serpent would, but as soon as the hardest parts of it all fell out, it was more like an enormous slurry of filth that just made the back of her diaper sag as quickly as it possibly could, the stench filling the air around them.

Not that the girl could focus on her own stink, the sheer sensation of filling her diaper was enough to give her an internal crisis. The more she pushed, entirely instinctually, the harder it was to see straight. Partly because of the tears of humiliation and pain running down her cheeks, partly because her mind was turning into a fog of humiliated pleasure. She wasn’t just shitting herself either, she was breaking any reasonable chance of her being called an adult ever again. The more of that slid out, the less of a chance she’d have to stand on her two legs without wearing a diaper.

Tiamat watched her little baby girl slowly sob, groans turning into moans in between those tears running down her cheeks. Not only that, but she couldn’t help herself from smiling as she watched that diaper being spread apart by the seat of the jumper, making the two opposing sides sink even further down as the weight of her own filth made her so easy to tease. And she had so much more to give too, given what the Beast had done to her body.

Da Vinci’s torture slowly but surely came to an end as the bottom of both sides of her diaper reached the floor, with her entire former bodyweight in pure waste filling the padding. Every little crevice, every little inch, completely packed and unable to be disposed of any time soon. Nor was it safe to get it off her, considering the stink that it contained. She just had to deal with this much poopy hanging off her waist, making her diaper nearly the size of the rest of her...

“N-No more poopies… P-Poopies bad…” The brunette muttered as she slowly brought her mittened hands up to her face, wiping away her tears as she sniffled and sobbed a little more. Her pride as a woman was broken into pieces, and the thing she wanted more above anything else today… Was to just lie down and pass out. This was all a bad dream, she could wake up if she tried hard enough…

Unfortunately for the young girl, her time as a baby had only truly begun, as she felt her body being lifted into the arms of her caretaker. “M-Mommy... “ She muttered under her breath, trying to wipe away her tears. She knew she wasn’t Mommy, or at least wasn’t supposed to be. But at the same time, her fragile heart couldn’t figure out what else to call her. She took care of her, and she was the only person that could stomach what she did from now on…

“There there. There there.” Tiamat whispered into her ear, rocking her back and forth as she held one hand on the back of her head, the other supporting that oversized load inside her diaper. Despite how much the girl had grown, lifting her was easy. At least, for a girl like her, it was the easiest thing.

Da Vinci slowly but surely listened to the words coming from the older woman, only to blink a couple of times as something didn’t add up. How could she possibly make that much of a mess without eating anything? More than that, how’d she fit in that jumper so snugly? It was big, and she wasn’t exactly big, so how did she…

She finally put two and two together, an incredibly difficult feat considering the current state of her mind, causing her to shriek internally. She could see the flab dangling off every single part of her body. It wasn’t even the loose kind of flab either, despite the way it wobbled when she moved her arms. It was actually pretty firm, which actually made it worse. Because that meant her body wasn’t going to easily lose it, as it was a proper part of her…

As much as the little baby girl wanted to cry out and throw a fit about all of this, she knew better. If she threw another fit, she’d just arouse more anger from the Beast. So she just kept her screaming and whining to her mind, hoping that all of this would be over soon. If not, she wouldn’t know what to do…

Tiamat took her time carrying her to the kitchen, letting the smell of her mess soak into her. A smell that the caretaker loved, but definitely made the baby’s face compress as she tried her best to not get another whiff of it. It was truly and utterly horrendous, to the point where she couldn’t believe she hadn’t gotten a change yet. And she wouldn’t get one any time soon either, knowing the cruel woman that held her.

When they finally made it to the kitchen, it was just as childish as the rest of her surroundings. She hadn’t even bothered trying to keep track of the hallways that they had just been through. She didn’t when she was an adult, and she didn’t now that she had the mental issues of a toddler. She just wanted this to be done! Or if not that, at least to have some din-din so she could let her tummy rest after all that got pushed out…

Of course since the little girl had been so horribly naughty, she didn’t get the chance to sit in a chair meant for big girls. No, she got to sit in a high chair. And you best believe it made her fussy, to the point where she almost started throwing her arms around in an attempt to get her will and way. But the more she tried to struggle around, the more she felt the weight of her body working its debilitating effects on her body, causing her to gasp and pant out of exhaustion mere moments after she started…

While her little baby was busy recovering from her weak attempt at flailing around, Tiamat locked her in, spreading the mess in her diaper into two halves, while the girl was allowed to sit down the best she could. There was still a lot of poopy underneath her butt, so sitting wasn’t exactly easy. And because she was so messy, there was one extra thing that she had to wear, while her stubby legs kicked around here and there.

A bib. A very big one. One that was so big that it actually managed to cover up much of her now-oversized body, and it even had a cute picture of her imprinted on it. Like it had appeared out of magic, showing a fitter version of herself… Which just served to humiliate her so much more, knowing how big she had gotten. She had been so beautiful just a little while ago, and then she ended up like this…

“Look at you, little one. You’re so adorable. Even my self-grown children can’t compare to you. You are the most beautiful little baby that I’ve ever had the pleasure of raising.” Tiamat chimed, her eyes gleaming with every word that left her mouth, the words digging into the fat frame of her beloved little baby. “And you can get so much bigger too, almost as big as your dearest Mother. I can’t wait to see how cute you’d be then…”

Da Vinci didn’t like the sound of getting bigger. But she did like the sound of food, drooling onto her bib and staining the image of herself that had been carefully imprinted. Already she was desecrating her own image, and she hadn’t even started spilling food onto it.

As she slowly saw the older woman bring a spoon close to her mouth, the ‘adult’ parts of her mind wrestled control back. Instead of letting it fly on in and park its cold butt on her sensitive tongue, she kept her lips closed, not wanting a single bite to slip on in. She wasn't going to eat a single bite! Not! One!

“Come now, little one. You know what happens to naughty girls. Surely you don’t want Mr. Owl to disappear again, do you?” Tiamat threatened her like before, hanging the life and fate of her most beloved little toy overhead. If she didn’t obey, then… Then she’d lose her favorite partner! Her lil’ owly friend who listened to her ramble on and on!

But! She had to hold out! She had her principles on the line! If she ate even a single bite, then she’d lose all adult privileges… Ever! Ever ever! She had to keep the fortress that was her mouth closed, no matter how tempting that food was! No matter how delicious it looked or how good it smelled compared to the mess between her thighs! She couldn’t eat a single miniscule speck of it, no way!

Her maternal caretaker looked at the young girl who tried to put up a good fight, her gaze locking on as her eyes started glowing. “You’re really going to do this? Did you not learn?” She muttered, absolutely disappointed. Incredibly so as she tried to force it in despite the closed lips, only for the girl to turn her head and get some of that warm and soft food on her cheek instead, serving to further aroused the mild and worrying anger of the caretaker.

It was working. That’s what the girl thought at least. She even looked a little proud as that food dripped off her cheek and onto the bib below, while she crossed her arms like a bratty girl would. She’d win this war of attrition! She could make it through, and she’d get the chance to escape, and she’d make it to Master, and she’d get a change, and-

Why’d her gums feel funny?

The girl slowly opened up her mouth, as the maternal caretaker was kind enough to show her the result of her effort to keep being a bad and naughty little baby. She could see her teeth, those pristine things that she had done such a good job of maintaining ever since she got to incarnate into the modern age… Shrinking. Sinking inward, without even a single bit of pain to go with it. She could just feel weird tingling flowing through her, making her spine shiver…

Before long, every single tooth had disappeared. Leaving her with gums that couldn’t clamp together, preventing her from fighting back against the Beastly caretaker ever again. And it made her sob. Because of course it did, what kind of girl wouldn’t sob at the fact that her teeth disappeared? Now she’d be unable to eat anything, not even the soft stuff that was still running down her cheek…

“I told you that you’d face consequences for what you had done, little one. Hopefully you understand this from now on.” Tiamat explained, every word dripping with pure disappointment. Still, she had to give her little girl some sort of dinner, as she slowly but surely undid the single apron she wore, letting it fall onto the ground to reveal the bounty that had been hidden behind for so long…

An almighty pair of boobs. Huge ones. So big that they were even bigger than the young girl’s head. Not just that, they were arguably bigger than her belly, and that was beyond huge. And unlike the boobies that were hidden behind the now-toothless baby’s bib, these ones were absolutely filled with nothing but an ambrosia for girls like her. Milk, and lots of it…

Da Vinci couldn’t stop herself from drooling. She literally couldn’t, it all kept being made and quickly ran down her cheeks thanks to the utter lack of anything to stop it. No teeth, no true control over her lips, nothing to make it seem like she didn’t crave those enormous mountains with all of her might. She wanted them beyond anything else in the world, she wanted to suckle all of their bountiful nectar down and satiate the emptiness in her tummy…

That need only grew as she saw the faintest droplet of milk run down, making her gasp and pant even more so. She wanted it so desperately that she almost started reaching out towards them… Only for her mind to kick itself back into gear, making her notice how utterly infantile she was acting. She quickly drew her arms back, hoping that she’d avoid being fed.

Not that she’d have a chance, because the older woman lifted her out of the high chair. Since she had no intention of staying still when locked into her seat, she just had to keep hold of her the old fashioned way. With one hand on her head, pushing her towards the enormous mountain of a breast, and the other firmly pressed against her crotch, while she laid her down on her lap…

“Drink, young one. You must grow strong. Strong in body, not in mind. Without Mother’s protection, that strength will falter even more than it already has.” Tiamat’s gentle song-like voice was hard to resist, and the allure of those breasts was far too tantalizing. The little girl’s lips instinctively got closer, so close that she could smell the milk dripping down and along her body…

But she’d tear her head back, refusing to latch on. She wasn’t going to give in, no matter how badly she had fallen. Her connection to her Master was going to keep her from falling victim to every single little way that the Beast wanted to regress her. No matter how delicious, rich or sweet the milk was, or how it’d satiate her tummy, she was going to resist! She had to, otherwise she’d just be another baby. And she definitely, absolutely, wasn’t a baby..!

Not that her dearest Mommy cared about her resistance. This time, she had a proper plan as to how she’d feed her. And it started with the nipple her baby was closest to, which was almost as big as the young girl’s nose, expanding and opening up to allow some more of that milk to pour on out by dripping down her body. But it wasn’t just dripping, oh no.

It was levitating. Like a snake, a serpent trying to aim for the hole it deserved to slip down through. It slithered around through the air, coiling its way towards her lips, which she couldn’t keep closed. This time, she had no way of preventing it from slipping in and heading straight down her throat, forcing her to drink it all up and enjoy the taste. Even as she closed her eyes and tried to focus on anything but the change…

The taste was, simply put, absolutely divine. There was no way for her to ignore the facts as they were laid out in front of her. She could feel every little droplet being wrung out for all its possible flavor, her taste buds experiencing literal and proverbial heaven all at the same time, making her cheeks grow nice and warm as she could feel it all plopping into her tummy in a matter of moments…

Da Vinci’s expression, which had been bratty and defensive, melted into nothing more than happy smiles and warm red tones covering her cheeks. Oh, it was the best thing she had ever tasted. Even better than the food when she was alive. It was even better than the good doctor’s cooking, which she missed more than anything. Or she would’ve, if not for this milk being so good that it actively started eroding her memories, making her droop and hunger for more…

She quickly latched her lips onto the breast where all of that wonderful stuff came from, slurping as much of it down as she could. Yet again her adult side had been subdued, and any attempt to prove herself as anything but a baby had fallen apart. She just had to deal with it and accept that this was how things were going to be, as she just kept on swallowing literal gallons of that delicious stuff…

As the little baby girl continued to drink more and more of it, she could feel a pressure in the front of her diaper. She was about to make a big puddle of pee. And while she’d normally press her thighs together and try to stop it, she instead just kept on drinking and closed her eyes, letting nature take its course.

Her thoroughly soiled diaper quickly grew soaked, more so than it already had gotten from the drool earlier, as her dearest Mommy started pushing her hand into the warm surface, bringing her more than a little pleasure from the act. Because her act of giving into her baser pleasures was enough to earn her a reward, as a sign that her fall was going naturally. A little moan even slipped out from the gap between the baby’s lips and the enormous breast, showing that she liked it.

Da Vinci’s mind, of course, wasn’t very pleased with this. The adult parts of her were fuming in response to this attempt to pleasure her while she was busy trying to drink herself to the point where she’d pass out. Now she couldn’t help but think about the wet mess down below, especially as all the pee that didn’t get soaked up by the super absorbent padding quickly mixed together with the enormous mountain of filth that had built up in there. It made the mushy mess even mushier, which would’ve been a problem if she was still sitting in the chair…

She now had a more important goal than escaping. A much more realistic goal too. She had to get changed. Get out of the diaper and hope that she could avoid the fate of sleeping in it, because it was really, REALLY stinky! A lot of her thoughts, at least the ones that were adult in nature, were being snuffed out by it! So she couldn’t even complain coherently, because it’d all turn into a bunch of babble, which was even worse considering the current state of her teeth…

Eventually, the milk came to an end. So did the nice squishies in front that made her feel all warm inside. And her mind could very carefully climb its way back to the forefront, even as she remained nearly glued onto that breast. She could see the scenery around them changing, making it clear that they were in motion, but her heavy body and her even heavier diaper made it hard to distinguish one part of the dream from another. Especially since her vision was so utterly blocked by the breast in front of her.

But they did get back to the nursery. And just like before, it was time for her to leave her Mommy’s arms. But not because she went down on the floor like before. This time, she was put straight down into an undersized crib, one that was comfortable for a girl of her size, but utterly unprepared for her diaper. Which meant that a lot of the overfilled plush padding was leaking out between the incredibly wide looking bars. If she was just a little thinner, and didn’t have this thing around her waist, maybe she could make it out…

“Now, little one. You’ve had your dinner, and plenty of it too.” Tiamat giggled as she put one hand into the crib, pushing down on the oversized fat baby’s belly, making her acutely aware that she had grown another couple inches outward from all of that milk. “It is time for you to rest. When you awaken, it will be playtime once more. And I will allow you to play with your toys to your heart’s content.”

Da Vinci looked up at her, listening to every word that she said. The whale song that hovered after every word made it hard to keep her eyes open, but she still had her willpower. She was going to get through this one way or another, as she slowly reached up with her hands…

Only for Mr. Owl to get dropped onto her belly, bouncing into her arms and quickly doing its best to pacify her. Her favorite owl wasn’t gone! She hadn’t been a bad enough girl to get that punished! She’d cuddle it and snuggle it and she’d… she’d…

N-No, she had to focus. “T-Twiamat…” She mumbled, having trouble really getting a feel for pronunciation now that she lacked teeth. She had a lisp, and a rather terrible one too. It didn’t help that she was drooling once more either, making it really hard to properly understand her…

“Hmmm? Little one, you know better than to call me by my name. Especially after everything you’ve gone through.” Tiamat replied, smiling from ear to ear as she kneeled down, making it easier for the little girl to reach up to her. “What do you wish for, little one? Another plush? I suppose that even if you have been naughty, if you promise to stay quiet during your sleep, I may give you the tiniest bit of freedom…”

The little girl in the crib shook her head as fast as her chubby cheeks would let her, as she did her very best to mutter out yet another word… “C-Chwange, Mwommy…” It wasn’t hard to understand what she was trying to get at, especially as she squeezed her stinky thighs together. She just hoped she’d get it. Even if she had been very naughty… Even if she had been a very bad baby girl!

Her Mommy looked down at her, eyes locking onto her as usual. Whenever she had the height advantage like this, it really did make her feel so utterly small. So absolutely tiny that there was no way that she‘d ever grow big enough to be able to challenge Mommy. But she hoped she’d listen. She really, truly hoped that she’d-

“No. You’ve been far too naughty to get changed, little one. You must wait until you wake up, and only then may you get the change that you desire.”

Da Vinci’s heart sank as she heard those words, causing tears to run down her cheeks incredibly quickly. It was like her heart shattered into a thousand pieces, and the only thing she could think of doing in response was point up at the one that had hurt her feelings this badly, before shouting in her lispy voice. “Mwommy! Bwad! Bweast! Bwad Bweast!” She shouted as loudly as she could, only for it to feel like she had lost her breath thanks to the fat on her body tiring out like usual.

...She shouldn’t have said any of that, as the older woman’s locked-on gaze suddenly turned absurdly deadly. She had just earned herself a one-way ticket to the worst punishment the woman could think of. “Still, you remain naughty. Very well. Pay naughtiness onto naughtiness.” The woman towering over her said, as she rather firmly grasped her sides, yanking her out of that comfortable crib.

The little girl dreaded what came next as she was lifted towards the changing table. She knew that it was going to be bad, but the childish part of her was winning out. That part of her thought that she’d get her way! She’d get to sleep in a clean nappy and avoid a rash and she’d thank Mommy and tell her that Mr. Owl thanks her too, it was going to be perfect..!

As she was laid down on the changing table, she squirmed. Not the bad kind of squirming, the excited kind of squirming. The kind that you’d do when you knew you were going to get a present, and you were so super excited that you just couldn’t keep still. That’s the kind of look that rested on the brunette’s face, giggling as she waited for her change.

It started out okay. The tapes on her diaper were undone and slowly the soggy front was undone. She could feel the butt sliding off, leaving a thorough skidmark on both the seat of the diaper and the table underneath as she was pulled out of it slightly, with no regard to how absurdly dirty the fat baby was between those cheeks.

Then she got turned onto her front. And the dread settled in once more. But it was far too late to dread what was already guaranteed, as an ear-piercingly loud *SMACK* echoed through the air, and nothing but pure pain coursed through her body…

It wasn’t just one spank. It was several. And they came so fast that her mind had trouble processing all of them. Her flabby body wobbled and jiggled with every slap that went through her, and she couldn’t help but scream and scream in utter agony, wanting it to stop. But this was the punishment she had earned. She had called her Mommy bad words, and now she had to pay the price.

Tears ran down Da Vinci’s cheeks as she did her best to try and crawl away, but she was far too heavy. Not only that, but the spell that had made her artificially heavier was active once again, making it utterly impossible to move much more than an inch. She had to lay there and take every single slap across both of her cheeks, turning them crimson in a matter of moments. All while the tears and the pain intensified, making her feel utterly miserable. She wished that she never called her a Beast, as a puddle had formed from her liquified sadness right underneath her chin. And some of her drool, because of course she hadn’t stopped drooling…

After both of those cheeks of hers started stinging so badly that it’d make anybody pass out from the pain, her dearest Mommy finally stopped. But she wasn’t entirely done. There was still one more thing to apply, one tiny thumb-sized thing that needed to go in through those shit-smeared cheeks, and nestle into the hole hiding in there. A suppository, one that her baby girl wouldn’t find out about until it had taken the effect it needed to.

Pain was the only thing that the little girl could feel at this point. There was way too much of it to ignore, and every time she even tried to move, that butt of hers would sting so hard it caused the other cheek to sting too. She was stuck in a painful, miserable experience. She just hoped it would all be over soon, so she could cry herself to sleep.

Her diaper was quietly taped back on after she was turned onto her back, the girl crying out in pain every time something rubbed up against her bottom. The only time it didn’t was when the mess within started brushing up against it. The wet filth was actually soothing, making her sobbing die down as she was carefully carried over to the crib once more with her head safely and securely landing on dear Mr. Owl to try and calm her down.

Tiamat, for her part, didn’t exactly enjoy much of this. She didn’t like bullying her baby this badly. She just wanted her to understand that if she kept being naughty, she’d get punished. The tears being shed, the utter pain she had inflicted upon her… It was something that she’d have to punish herself for in the future. But hopefully, the suppository would help her. All she needed now was to sleep, and then everything would be alright.

Mommy quietly left the crib as she readjusted her apron once more, taking a seat in her rocking chair as she’d quietly hum herself back to sleep. All while the girl in the crib continued silently sobbing, some parts of the horrendous pain having been dulled at this point. There was still so much more she had to ignore, but at least this wasn’t the worst experience any longer…

Still, she had been punished so badly that she had to hug away at her plushie for support. Her ever-loving and ever-watchful Mr. Owl, who always brought her joy when she hugged him. Hugging him made all the pain be nothing more than a bad thought in the back of her mind, as she sobbingly giggled thanks to his soft fur and feathers rubbing into her. It really did work wonders, considering how quickly her frown turned upside down.

“Oh, Mr. Owl… What would I do without you…” Da Vinci muttered, unable to perceive her own lisp as she talked to the plushie, honestly just happy to have somebody to talk to. Happy to have somebody she could trust with her secrets. Somebody that always looked at her and made her smile with his infinite patience and utter love for her. Whenever she squeezed him tight, she felt right at home…

She looked into the stuffed owl’s eyes and smiled as the glass-like beads reflected her own, her thumb slowly drifting towards her mouth, only for her to stop it by hugging the plushie tighter. “This… This has to have all been some sort of utterly awful dream. I’m going to wake up tomorrow in my bed, and I’m going to see that it’s been a mess because of everything, and... “ She muttered, a few tears streaming down her cheeks. She could already imagine the utter mess on her bed and how badly it’d smell. Probably just as badly as the mess on her butt right now…

The more she thought about it, the harder her thumb tried to drift towards her lips, and every time it crept close enough for her to nearly suckle on it, she pulled it back. She could feel the near-magnetic pull her lips had towards it, and she refused to give into it. “What’s… No, I don’t wanna suck on my thumb…” She mumbled, trying to pull herself away from her own hand, but it just kept on drifting back towards her.

She tried to wrack her teeny milk-addicted brain, not knowing what could’ve caused her body to act this way. Only as she focused on that addiction, and the burp that left her mouth after having been caught in her tummy for so long, did she realize the connection. It was the milk… She still wanted more. And the only thing that she could do to stifle that desire for the rich white stuff, was to stick her finger into her mouth and hope it’d all go away by itself.

Da Vinci tried. She really did. But she couldn’t. The thumb went straight into her mouth, now overpowering her will to be an adult as she was forced to suckle on it. And it did calm her, even if only slightly. It was weird and gross to suck on compared to her Mommy’s boob, but it had to do for now…

Her gaze fell upon Mr. Owl. She couldn’t say a thing to it with her mouth full of thumb, but the panicked expression on her face was easy to translate. She didn't want this. She wanted milk. And she wanted it more than anything else, wanting to throw away a few of her plans just to get more of that milk…

But it wasn’t just milk that she craved! She craved something more important than milk, even more important than escaping… Because she’d need the energy to overcome her fat baby body and sprint all the way to Master’s room!

She needed her beddy byes. She needed to sleep, and she needed to sleep so long that Mommy wouldn’t notice her not waking up. Then, when she’d wake up, she’d sprint straight out! She’d jump out of her crib, or break it if she had to, and then she’d sprint until she couldn’t sprint any more!

For once, Mr. Owl seemed to react to her desire. Its beady eyes started glowing, and one of its wings started to rise into the air, only to then point back down towards the floor, drawing the infantile thumb-sucking girl’s attention towards the spot it pointed at.

As it turned out, Mommy had left her a little gift. A pacifier laid at the edge of the crib, waiting for a good mouth to suckle on it. And wouldn’t you know it, she had the best mouth around for suckling, considering how much drool kept pouring out and around her thumb. She didn’t hesitate, ignoring the absurdity of her plush actually moving, as she grabbed ahold of the pacifier with her free hand…

Da Vinci pulled her thumb out of her mouth and quickly stuffed the pacifier into her mouth, suckling on it out of necessity. And she was rewarded, as her eyes quickly lit up. It tasted just like Mommy’s milk! And no matter how hard or how much she sucked on it, the taste didn’t go away! It was like infinite milk, without the milk filling her tummy and making her need to go potty!

“Twanks, Mr. Owl!” The lisp poked out through her pacifier as she snuggled away at that lovable owl, squeezing it real tight as she slowly but surely started yawning. She had finally run out of energy. It was time for a little girl like her, who loved nothing more than to get out of here and away from Mommy so that everything would go back to normal… to get her Beddy Byes.

She yawned one more time as she laid her head down and closed her eyes, drifting off to sleep as she snuggled her beloved Mr. Owl. “Da Winci go Bweddy Bwye…” She muttered, suckling her way off to the land of a dream within a dream.

Unaware of the Suppository taking effect within her…

---

The next time the young girl opened her eyes, things felt ever so slightly off. Not because it felt bad, far from it! She felt super refreshed, like she went through the best beddy byes one could’ve ever wanted. But, there was still something really, really weird about how she was feeling.

She didn’t have Mr. Owl. But honestly, she had forgotten all about him while she slept, so she wasn’t too distraught about that. A testament to her regressing mind, more than anything.

What did provoke confusion from her was the way that her diaper seemed less… full? It was wet and messy, yes, but it seemed like a new diaper. Had she been changed in her sleep? Maybe Mommy was nice after all. But the fact that she messed herself in the first place really did show that she was nothing more than a baby, didn’t it…

Da Vinci slowly squished her thighs together, making the brown lump in the back of her diaper move around as the space allotted to it shrank. It felt really nice to have it move around, more so than the bigger mess ever did. Not only that, but the extra soaky bits near the front of her padding made it really squishy, which made it feel even better.

The more she played around with her diaper, the more she noticed that the strange comfort she experienced was a result of how warm the mess was. It wasn’t dry or anything, and the smell was… not actually that bad. Maybe she had just gotten used to it. Or maybe… Nah, it was just kinda nice to play with it, and that’s all she needed to know.

As she continued to squish her fingertips into the soaked and messy pamper, she noticed that her head felt a little off balance. When she tilted it one way, it tilted faster than normal. The same if she tilted it the other way, leading her to try and put her stinky hands all over her head to try and figure out what the cause was. After all, she was just a baby who had used her diaper in her sleep, she couldn’t put two and two together to try and think her way to a solution. She had to feel for it!

Once little Da Vinci felt a bump or two on top of her head, she tried to look up. Which wasn’t easy, considering that the bumps were pretty small, and she was still lying down in her crib. So she had to think creatively. She pushed down and lifted herself up onto her diaper, using it as a seat as she tried to look for a mirror, something to try and identify herself…

It didn’t take long to spot the obvious full-height mirror, letting her catch a glimpse at her reflection. And when she saw it, oh boy did she start shivering and worrying. Because growing from her head, her precious little noggin that could never do anything wrong, the same head that had previously been filled with so many clever thoughts…

Were a pair of stubby little horns, curled around themselves like a ram’s would. And judging by the ends, this was hardly going to be the last bit of growth they’d go through. But more importantly, it signified that something terrible had happened to her. She had been changed in her sleep, and not the good kind where she ended up in a clean diapy! The kind where she wasn’t human any longer, probably leaving her as some sort of beastling!

Tears quickly started rolling down the regressed horny girl’s cheeks as she started sobbing like any little girl would when faced with a problem they couldn’t understand. What was she supposed to do when faced with her growing lack of maturity, and the fact that she was transforming?

As if it couldn’t get any worse, the sobbing girl, who wasn’t playing around with her diaper at the moment, could feel the mess inside her diaper actively wriggling around. It was slithering about as it tried to reach out of its containment, almost as if it was alive. Just… Just what had happened to her!?

Da Vinci cried and cried, unable to see anything thanks to her tears filling her eyes and obscuring her vision. She couldn’t stop crying for anything, hoping that somebody, anybody could come save her. Hopefully her Master, but she’d even take her Mommy at this point! She’d tell her that it’d be alright, and as long as she’d obey, things wouldn’t end up that bad…

“Oh dear, oh dear. You’ve woken up already…” The voice of Mommy rang out in her head as the Beast appeared from a portal, having left the room for just a few minutes. “I thought you’d sleep until midday, but I guess you’ve still got room to grow there…” She mused, putting a hand on her chin…

The little girl couldn’t hear her dearest Mommy speak, preferring to just cry and cry until everything went right with the world once more. And only once the older woman actually scooped her up into her arms did she realize that she had come back. She tried to call out to her, tried to say anything, but a horrible realization came with it…

She was babbling. She couldn’t get a real proper word to leave her lips, her lack of teeth making it hard enough to enunciate anything, but now her tongue was feeling extra numb too. Anything she tried to say turned into pure drooling babble that absolutely nobody could properly understand...

“How utterly adorable, the sounds you make with that little mouth of yours…” Mommy chimed as she slowly ran a hand through the girl’s hair, letting the sides brush up against those adorable horns. “Your medicine’s been working well. I didn’t imagine it could change a little baby like yourself this quickly, but you’ve certainly proven me wrong before, what with how naughty you’ve been.” The words that left her mouth were as kind and as song-like as always, keeping the girl calm despite everything that indicated that she should be fighting back in some way…

Da Vinci listened to everything that Mommy said, but it was really hard to pay attention. The more she spoke, the sleepier she got. Yet at the same time, the more she referenced those horns, the more she worried about them! “M… Maaa… Maaamaaaa…” She tried to drag out her words this time, trying to get her attention so she could focus on those dangerous nubs and help her get them off her head, but all she could do was say such an infantile corruption of an already childish nickname…

“That’s right, little one. I’m your Mama. Now and forever.” Mommy giggled as she walked towards the changing table like usual, her hand squishing into her diaper causing the mess within to wriggle like it had already been doing. “Such lively messes, just as a proper baby of mine should have…” She whispered, keeping it quiet so as to not alarm the girl more than she already had been…

Once the little girl was laid down on the changing table, she didn’t try to struggle. She knew better at this point. She just hoped that everything would be alright, as she carefully suckled on her milk-flavored pacifier. It was enough to make her relax, especially as the diaper around her waist was undone, revealing the healthy messes packed inside…

“Such a wonderful smell…” Mommy muttered as she leaned very close to the visibly wriggling mess that had been trapped within the padding while licking her lips, a gesture that the seemingly living poopy returned by wriggling more affectionately. “You’re healthy as can be, little one. But beyond that, there’s something I want to check…”

Her hands fell onto the flat parts of the diaper, as she leaned really close to the young girl’s crotch, wanting to examine something. And in that very moment, the adult mind inside Da Vinci, which had seemingly been buried by how badly she had been humiliated, finally clawed her way right back to the top. What was the first thing that the restored psyche of the Caster did..?

Why, it was to spring up onto her chubby legs, her fat frame wobbling all over as she jumped off the changing table without even a care for how risky this plan was. She had one shot, and she was going to take it!

“Little one-” Tiamat tried to cry out, but it was too late. She had been outpaced by the fat infant’s movement, letting the latter run straight into the portal that she had deemed unimportant. The same portal that she had entered through, and the portal that a little baby girl like her really shouldn’t go into…

Da Vinci thought that she would end up home as she jumped through the portal. She thought she’d get to see her Master, and even though she was as naked as could be and definitely super messy down below, she hoped she could get a chance to be loved by him and everyone else once more. But unfortunately, her dreams were dashed as she looked around.

Everything around her seemed to wriggle. It was cramped too, like the world around her was trying to push down on her. And it was hard to breathe too, like she was underwater trying to blow past all the liquid and catch a proper breath of fresh air…

And yet, despite that, she felt… calm? She could hear a powerful heartbeat, one that would make anybody calm with how the rhythm pierced through them. She could feel her eyes slowly closing, as something started wrapping around her legs, trying to pull her further into the strange realm she had just wandered into. A realm that she was definitely meant for, if the heartbeat was right…

Just as she was about to completely lose herself in the beat of that distant heart, the young girl was yanked right back out of the portal she came through, landing in the arms of her beloved Mommy once more. And this time, the expression on her face was not one of outright anger at her disobedience, but rather disappointment. She was so disappointed, having hoped that the little baby would obey after having had her beddy byes.

“Little one. Oh, little one.” She muttered, but it was very clear to her that the young girl could barely understand anything, given the fact that her expression was one of pure bliss. That, and all the drool that quickly ran down her chin, a result of how utterly exhausted she had gotten in a matter of mere seconds. “...I suppose punishing you as a human wouldn’t do. No, you’ve earned a punishment beyond that. All for looking into a place you should’ve never gone into...”

While Da Vinci quietly blinked and gurgled, trying to claw her way back to an energetic state, she could hear the sound of singing ringing through her ears. It was the whale song, and yet it was… different? It didn’t bring her calm, and it seemed to do something nice to her just like the wriggling poopy had made her feel nice.

As she looked down for just a brief second, she noticed that her belly was turning a deep white, making her blink several times as her mind tried to catch up with what was going on. She pushed her fingertips into the changed part of her, only for them to spring back. Not like when she touched fat, but more like when she really pushed her fingers deep into her padding…

The little baby girl’s mind was doing its best to catch up as the white stuff travelled up her body, turning more of her into the same plush material. “M-Mama…” Her lisp plus the difficulty of actually saying anything meant that every single word that left her mouth was trailing in some fashion…

“Don’t fret, little one. You’re becoming something much better than a naughty girl. You’ll be at home around a good girl’s waist, being filled with all sorts of fun messies. Then they’ll play with you, squish you and fill you with their pee until you start bursting at the seams… Not that you’ll break. You’re such a pretty little girl, after all. And your sisters, as many as you’ll have, will need the prettiest diaper to keep their messes in check…” Mommy explained, outlining why the girl’s body was changing as it was. And the more she spoke, the quicker the process became…

Every word that left Mommy’s mouth was one that made the little girl more relaxed. But the adult mind, the one that had clawed her way to the top before and managed to escape if only for a moment, didn’t like the fact that most of her torso had turned completely plush. Whether it was her breasts or her tummy, it had gotten mostly flat with some amount of squish to them. This wasn’t right, she had to do something.

Da Vinci tried to struggle against this. She really did. She tried to squirm against the older woman’s grip, she tried to jump from her arms and onto the floor, but as the transformation spread down to her legs and fused them together, there didn’t seem to be a way for her to actually bounce. Neither was there a way to push herself off, as her arms were quickly slimming and curving, with her hands turning into simple tapes that would keep her properly wrapped around a waist, ready to snuggle away at her wearer…

If she could, she would’ve screamed. But she just kept on drooling, her body disobeying everything that her mind tried to make it do. It was frustrating, it was aggravating… And it was exactly what she wanted… Wait, no! She didn’t want to be used! She wanted to go home to Master, and… and…

‘M-Mmmph…’ A single, moan-like thought rushed through the diaperfying girl’s mind. She could just imagine herself in the form of a common diaper, one with no significant pattern or anything, wrapped around her Master’s waist. She could imagine him squatting down and filling her up, squishing his butt up against the floor and playing with himself. Those thoughts weren’t her own, and yet they were taking over quicker than ever. They were disgusting, invasive, and… and…

She loved it. She couldn’t explain why the feeling of having her mind invaded by thoughts that weren’t her own was turning her on so much, but it was doing a number on her. The more she thought about it and gave into it, the more she accepted that she should just be nothing more than a diaper, ready to be worn and played around in. She was a garment for everyone to enjoy, especially Master…

Da Vinci’s consciousness grew weaker and weaker thanks to these intrusive thoughts, with her legs having turned completely plush and her feet turning into a second set of tapes, making it even harder for her bond around a fitting waist to be broken. Not only that, but she her thoughts of wrapping around somebody was now replaced with the sensation of a certain mess rubbing around inside her midsection…

Those wriggly messy worms, her own mess made into some sort of living entity… She could imagine the way that they’d rub up against her, turning her on as they manipulated their wearer. Probably by making them mess harder and more often, giving them more room to grow by combining with the other filth…

Most of the older girl’s thoughts had been completely buried at this point, and the only thing that remained were the thoughts of an eager diaper. A diaper that could move, if even just slightly, to the point where she squeezed herself together at the thought of being coiled around just like what happened right before she was pulled out of Mommy’s special little portal place. It felt really nice, and if that meant she’d get used by somebody that wanted to test her to her utmost capabilities, then it’d be exactly what a diaper like her was supposed to…

That’s right. She wasn’t a girl! She wasn’t supposed to be a girl at all either, what was she thinking? She was a diaper! A diaper that was meant to be used and discarded, but she wasn’t just going to be discarded, because she was a living one! She could get cleaned and filled to the brim again and again… Or they could fill her up so much that she’d always have lots and lots of messy stuff wriggling around in her, if the babies that Mommy talked about were anywhere near the kind of baby that she had been!

As her mind gave in and totally accepted her role as a garment, the diaper that had once been Da Vinci quietly fell onto the floor below, the inner padding facing the ground. With that ultimate submission, the pattern on the outside had properly formed, taking on the design of her original dress, before the older woman had forced her to wear a humiliating babyish outfit. Now, people could dress like her to their heart’s content, and wear her to complete the look!

The needy living diaper flexed back and forth, her wings trying to wrap around anything as she floated into the air. She was happy! Really, really really happy! But there was nobody to wrap around! Nobody to shower in her love for messies! Nobody to fill her with wriggly stuff and pee so she’d be soaked and stinky… What was a diaper like her going to do?

Mommy smiled as she watched the excited diaper flap and flex around in the air, waiting for somebody that could wear her. Considering a lot of that mass that she had accumulated from all of her meals had turned into pure fluff inside the diaper, it was going to be hard for anybody to wear her and not look like a complete baby. Which was entirely the point, why wouldn’t you want to be a baby that filled her to the brim when you wore her?

The horned Beast grabbed ahold of the Da Vinci diaper, kissing her on both the inside and the outside to calm her down. While licking the inner surface ever slightly to soak it up, giggling all the while. “Such a wonderful little one you’ve become. More plush than anything humans could’ve thought up, and a sign of their eternal fate…” She mused, pulling back as she licked around her lips before licking her finger just the same.

“A fate that has been ordained for them for so long, ever since they tried to fight back against me. A fate that has caught up with them, by choosing to summon me… A fate that promises their eternal protection, underneath my loving gaze…” Tiamat mused to herself as she hugged the ecstatic diaper tight, causing her to vibrate with love in response…

It was their fate to be her babies. And with her summoner turned into a diaper, she was now free to act out that fate…

---

Despite everything that had happened to the girl, despite how much she had gone through… in reality, barely any time had passed. At most a single hour, and yet on the floor laid the results of everything that had transpired within that dream.

A diaper. The final form of Da Vinci, the dress-themed padding that the tall robotic Beast picked up, a smile slowly forming on the manifested matron’s sleek expression…

She slowly made her way out of the machine that had summoned her, humming her whale song to herself. There was so much still to do, and it would all start with the Master of her ‘Master’...

Humanity would be hers to cherish and baby soon enough.