[ABDL, Reality Shift, Soiling, Humiliation]

"From one Foreigner to another..?"

Abigail Williams was a girl that, by all accounts, should not exist. And yet thanks to the machinations of one lingering Demon God, she had become a vessel to an Outer God's power. Thanks to the efforts of Chaldea, however, she was able to use that power for good instead of turning it on humanity.

And yet one fact remained. She was still a rather young girl. And thus she couldn't help but be carried away once her curiosity was piqued. Which had happened, courtesy of this strange notebook that had appeared on her bed one fateful morning.

Abigail looked at the note very carefully, wondering what Foreigner would give her something like this, before shrugging her shoulders and removing the note so she could examine the book itself. "...Baby Note?" She muttered to herself. What a strange book. What kind of baby would be able to write in a book? More importantly, what was a baby going to write in there?

The young girl opened the book, and was greeted by the foreword. "Anything written in the pages of this book will come true. Just write down the name of the Baby you want to toy with, and you can make them your adorable plaything..." She read it out loud, as she slowly started to think about what it might be implying.

It was then that her curious look turned into a devious one. She was on Humanity's side for sure, but she was still so young. And that meant that she could very easily get carried away. And if this book was truly able to do what it said it could, then... Then she could prank all sorts of people around Chaldea!

Oh, there were so many different Servants that needed a good prank! The serious types, the rude types, the cute types, and especially the stuck-up types! She could hardly contain herself as she thought about all the possible victims...

So she didn't even try. She ran straight out of the room, with her arms wrapped around the notebook. A great big smile was on her face, and her mind had been made up.

It was time to carry out a bunch of pranks!

---

"I wonder if she will... No, she wouldn't want to go there... And yet at the same time, she's made it clear that she's more than happy to go wherever with me... Oh, goodness..."

Lanling Wang, a Saber-class Servant and beautiful boy who had to hide his beauty from the world with a mask, was currently pacing back and forth in one of the many meeting rooms. Right now, he was using it to plan his outing with his Master. She had asked him on a date, and asked him to try and pick out a place for them to visit. They could traverse the stream of time, so it was easy to get to anywhere they wanted. It was just a matter of picking the right place...

But he was an indecisive person by nature. Or rather, he just wanted to make his Master happy, and he wanted her to be as happy as possible. Which meant that he just ended up pacing back and forth, unable to pick one option over the other. What was he supposed to pick..?

As he continued to pace back and forth, the door to his room slowly but surely pushed open. And the devious Foreigner poked her way in, grinning from ear to ear while doing so. A worrywart like him was going to be the perfect subject for her first prank. He'd probably end up extremely flustered by what she did. Assuming it actually worked like intended.

With a pen in hand and her eyes on Lanling, Abigail wrote his name on one of the pages within the Baby Note, and started to write down several statements that were to become truth.

Lanling Wang

-Lanling Wang is diaper dependent, never going without his diaper because of his sensitivity.

-Lanling Wang wears a soft onesie that keeps him protected from harm.

-Lanling Wang's face is so adorable that anybody that sees it can't help but baby him.

-Lanling Wang can't decide anything for himself.

-Lanling Wang feels happiest with a Mommy by his side.

She narrowed her eyes a little as she finished writing down the rules. She had gone through a few basic ideas if she had to be honest. But it was worth being basic, just to test things out. And with her eyes firmly locked on the young Saber pacing back and forth, she hoped that it would all take effect. Hopefully sometime soon...

Lanling quietly muttered to himself as he paced back and forth. Perhaps he should just head to one of the many beautiful lakes that dotted China, and then enjoy the view. Master had always told him that she would love to see the sights when she didn't have to worry about the world about to cave in on itself.

Besides, being with Mommy, having his head rest on her lap while she breastfed him... That'd be really nice...

The masked young man blinked as the stray thought drifted through his head. "...I-I must be getting delirious. I've been thinking for far too long. What will Master think if she saw me like this?" He muttered, as he went to take a seat on his bed. Just so he could try and clear his head a bit.

Not that he got the chance. As soon as he took a seat, a crinkling sound echoed through his ears. And while he blushed, he also felt a certain kind of relief and comfort. Which just made him blush even further. The sheer bewilderment and shame running through him was juxtaposed by how 'normal' it felt to hear a crinkle.

Looking down, Lanling could easily notice a diaper wrapped around his waist. A rather thick looking one too, that just happened to be a little soggy in the front. How had it started to grow soggy? For that matter, why did it feel like something so ordinary?

Just thinking about it for too long prompted Lanling to tremble and whine, as the faintest hiss echoed from his nethers. All while the front of his brand new diaper started to grow yellow as it soaked up the pee that poured out. "T-This can't be real..." He didn't know what to do now.

Slowly but surely, Lanling hugged himself for a kind of comfort. Completely ignoring the fact that a bunny-themed onesie had wrapped around him. Leaving him with mittens and booties, ensuring that he wouldn't be able to fight ever again. Especially not with his current nature. All he could do was just sit there and shiver and worry, not knowing what to do.

"W-What's M-Mommy going to think when she sees me?" Lanling muttered, hugging himself more and more as the faintest hiss echoed out more and more. He was peeing himself in small bursts. Which was arguably more humiliating than just peeing once and getting it over with. It reflected his nervous nature. And how much he really needed somebody to hug him and tell him that everything was going to be alright...

It was then that a knock echoed through his room, before the door opened and revealed his Master. Ritsuka, who couldn't help but smile upon seeing the onesie-clad Saber. "M-Mas- Mommy!" Lanling cried out, trying to pull down the hood of his adorable onesie. "D-Don't look, I-I'm... I-I..!" He really couldn't muster up the courage to tell her what was going on.

Ritsuka didn't say a thing as she watched the adorable Baby melt thanks to how nervous he was. She just walked over with a soft smile on her face, looking right past the hood that he was trying to pull over his eyes. "Oh, Lanling. You know Mommy wouldn't blame her most adorable little Baby. You should've told me that you couldn't handle picking a place for our date." She giggled, not at all bothered by what he was doing or wearing.

Lanling blinked a few times as he slowly let go of his hood, before gasping as Mommy snatched the mask right off him. "M-Mommy! I-I need that!" He cried out in shock, as he tried to reach for his mask.

Only for Ritsuka to pull him close to her chest, causing him to yelp and gasp and wet himself a little more. "Sssssh. Ssssssh. It's okay. Mommy thinks you need to learn to go without the mask for a little while. Besides, you know how much everyone loves their little Baby Prince. Isn't that right?" She giggled, all while smiling down at him.

It felt humiliating for Mommy to treat him like this. And yet at the same time, it felt comforting. Mommy was always there for him. Mommy was always there to make sure that he felt good. So even as the hissing sound between his thighs grew stronger and stronger, he just closed his eyes and leaned into her chest.

"There there..." Mommy Ritsuka said, lifting the adorable baby into her arms while kissing him on the cheek. She really did have to do everything for him. Not that he was the only one that needed her, but he was definitely one of her favorites. It was why she had agreed to go on a date with him. Even if he was just a sweet little baby. "For now, we'll just enjoy our date in the Daycare. Alright, dear?"

Lanling nodded softly, not able to choose any better places for them to spend time together. If Mommy thought it was best for him to be in Daycare, then that's just how it was going to be. As he snuggled nice and close to her chest, he closed his eyes and giggled a little, the soggy little baby beyond humiliated and yet accepting that this was all that he was. A pissy baby that couldn't help himself...

Of course, neither Ritsuka nor Lanling noticed that Abigail had been watching, nor that she had been beyond amused with the results of her first prank.

If she was able to change Lanling that much, then her next few pranks were going to be even better...

---

"Trimmau. Another."

"As you wish, Miss."

Abigail was strolling through Chaldea, trying to find more people that would be fun to mess with. And yet she hadn't quite been able to find any. Mostly because a lot of them were currently busy with missions that Master had given them. Ironic, considering what Master was currently doing. What would they think once they saw her taking care of that big baby?

But as she passed by the cafeteria, she overheard something. And she could even smell something really nice. It was rich in flavor. So rich that she immediately poked her head in. Who had been making such delicious sweets? It couldn't be Semiraimis, despite how delicious her chocolates were. That valentine's day was so chaotic that she swore off making them ever again, except for very special occasions.

Abigail's expression then soured as she saw the source of that wonderful smell. It was a tray full of extra delicate chocolates, currently being held by a maid made of mercury. All while said maid's mistress was currently plucking one piece of chocolate at a time from the plate, enjoying the taste of having the chocolate melt on her tongue.

The mistress in question was Reines... El... What was it again? Abigail never really did bother trying to learn her full name, because she was a really rotten girl. She had tricked her countless times. Which was simply rude, tricks were her thing, she wasn't supposed to be tricked. And her maid was... A mystic code of sorts. Trimmau was what her name was, but it was hard to think of her as anything but a living mass of movie references. What with all the quotes she spouted, and how she insisted on being a technological marvel.

Even though she wanted to teach her a lesson, Abigail knew that if she tried it... She would probably have a way to turn it around on her. If not that, she'd be paying her back ten times over in the future. That girl could hold a grudge well. So she had to make sure that her trick was impossible to counter. Otherwise...

"My my. You're staring, Abigail. Are you jealous?"

Reines had noticed her. Not that it was hard to notice Abigail, since she was blatantly sticking her head into the cafeteria, which was otherwise completely empty. She couldn't hide from the Magus' deceptive gaze.

"Nope, not at all!" Abigail said as she walked inside. "Can I have a piece?" She was definitely jealous. Especially since the chocolate had such a special fragrance. It made her shiver a bit just from letting it reach her... It was a very adult fragrance, one that she wanted to indulge in. She wasn't that young, and it was just chocolate!

Reines grinned as she watched Abigail try her best to appear as adult and as reasonable as she could. All while failing miserably. She was so, so easy to read. Then again, it was hard for her not to read her opponents and her fellow allies. Being summoned and merged with a Heroic Spirit until they had truly saved the world happened to enhance her abilities, especially when said Heroic Spirit decided to let her run the show most of the time.

"Are you sure you're old enough, Abigail?" Reines's grin widened a little further as she plucked another piece from the tray. One shaped like a heart, which she gently put onto her tongue. "Trimmau added a hint of wine while making these. You could end up drunk in seconds. And you know what Master might think if she sees you like that."

It was ironic that she spoke of being an adult, when she looked almost as young as Abigail did. The difference was solely in the way that they carried themselves. Which really just meant that... If Abigail wanted to turn the tables, then she needed to prove that the mocking girl was just as young as she looked. Maybe even younger.

At this point, she didn't even want one of those chocolates. No, Abigail couldn't stop herself from pulling out the Baby Note, as she very rapidly started to scribble within it. She even made sure to write down her full name. Reines El-Melloi Archisorte. Such a complicated name compared to her own, but she was in just the right mood now. Something so complex wouldn't stand in her way, because she was going to not only prank Reines but also teach her a lesson!

"My my. Are you writing your frustrations into a journal, Abigail?" Reines said, as she plucked another chocolate from the plate, letting it melt on her tongue before she swallowed it. "Maybe you should show it to Master. I'm sure she'd love to see what you've written. If you've even managed to write something coherent. You are a little girl, after all. I'm sure you have trouble with big words and complex concepts." So smug. So unbearably condescending and venomous...

Abigail took a look at everything she had written for Reines, and she began to grin...

Reines El-Melloi Archisorte

-Reines El-Melloi Archisorte may look like an adult, but she's actually the biggest baby of all.

-Reines El-Melloi Archisorte is only allowed to eat baby food and drink milk, like the baby she is.

-Reines El-Melloi Archisorte starts to wet herself whenever she consumes alcohol.

-Reines El-Melloi Archisorte always has her caretaker by her side.

-Reines El-Melloi Archisorte cannot command her caretaker, because babies cannot give commands.

-Reines El-Melloi Archisorte's caretaker takes commands from others, because she can always learn more about caretaking.

-Reines El-Melloi Archisorte's caretaker will not intervene if anybody else wants to punish her baby.

This time, when Reines tried to reach for another chocolate on the plate, she couldn't grab one. In fact, she couldn't even feel one of the chocolates as she tried to reach for them. Which prompted her to turn her head towards Trimmau, a single eyebrow raised. "Trimmau, what is the meaning of this?"

"Babies do not eat chocolate, Baby Reines. You know this." Trimmau's tone was suddenly a lot more maternal than ever before. Not only that, but she sounded a lot more strict. As if she had any sort of authority in their relationship as Master and Maid. Of course, Reines couldn't know that the Baby Note had irreversibly altered that relationship.

"...Baby?" Reines looked utterly shocked, before laughing as she leaned back in her chair. "You've got to be kidding me. I'm not a baby, Trimmau. What kind of movies have you been watching? Hopefully nothing too perverted, because this kind of insubordination... It's just ridiculous!" She shouted, her shock turning to anger. "Give me my chocolate, Trimmau!"

"Throwing a tantrum will not make me give you chocolate, Baby Reines." Trimmau's robotic and maternal tone reprimanded the young girl, as she continued to hold the delicious treats right out of her range. "You know what they do to your stomach as well."

"They do nothing to my stomach, you broken maid!" Reines shouted as she tried to reach for the plate. "Give! Me! My! Chocolate!" Just as the note implied, she really was the biggest baby. She was trying so hard to look like an adult, and now she was revealed to be the biggest and brattiest baby of all...

Abigail was enjoying the sight of what was happening in front of her. Sure, she had to cause it by using the Baby Note, but the fact that Reines was finally acting like the brat she truly was... It was blissful. And it was the best prank of all too, because there's no way that she'd put two and two together and realize it was her fault. "What's the matter, Baby Reines? Aren't you supposed to listen to your caretaker?"

Reines could feel her blood boiling as she glared at Abigail. She had to have done something. And yet she didn't know exactly what. She was a Foreigner, so it wasn't impossible to assume that she had altered Trimmau's mind. But she hadn't done anything except scribble in that book. "Shut up, I'm not a baby! I'm not!" So she settled for just asserting that she wasn't a baby. Because what else could a baby do if she couldn't figure out the solution?

"Please calm down, Baby Reines." Trimmau said, gazing towards Abigail. "Miss Abigail. You have experience with babies? Is it possible you could help?" Like clockwork, she tried to get advice from others. Because as advanced and as impressive as she was, she was nowhere near good enough to handle a baby all on her own. Especially since she was literally just altered a few minutes ago.

"Just wait." Abigail grinned from ear to ear. All while she watched Reines just continue to throw a tantrum. It wouldn't be long before she'd put a stop to it. And all because of one of the rules that was taking a little while to activate...

Reines struggled and writhed and shouted as she restlessly kicked her legs around. And then her tongue finally pressed against the roof of her mouth, and she got to taste the chocolate still lingering there. In an instant, the Baby Note's powers activated, and she heard a faint hiss. A hiss that then grew louder as Reines stopped thrashing around, stunned by the sheer shock of what was happening.

She... She was wetting herself. She was peeing her panties and making a mess of her chair, as well as quickly forming a puddle on the floor. How? How was she wetting herself? It should be impossible. She had control over her bladder. She was... She wasn't a baby. She wasn't! She wasn't!!

Tears slowly started to run down Reines' cheeks as she continued peeing herself. The chocolate, having faint traces of alcohol, served to trigger one of those rules. And as such, the poor girl's panties were ruined. Soaked beyond belief. And the Baby Note made sure that she was as full as she could be, resulting in quite the accident.

"That's why she was crying and throwing a tantrum, Trimmau. She needed to pee. She just didn't know how to say it." Abigail chimed, as she leaned closer. "Here, this is how you deal with her. You just have to..." She whispered instructions into the maid's ear. All for the sake of the Big Baby in front of them, who was probably going to throw a bigger fit if she heard what she was telling her.

Trimmau listened carefully and slowly nodded as she started to take in what she was being told. Of course. All of that made sense. She really should've thought about it earlier. It would've made all of this so much easier. "Thank you, Miss Abigail." She said, nodding slightly as she looked back towards Reines. She now knew what to do...

Reines was still too shocked to do anything. She had wet herself. She had done something that only babies did. Which was why she initially didn't struggle when Trimmau picked her up and put her on the nearby table, only realizing that something was dangerously wrong as she also removed her panties. "W-what are you doing!? Stop! I demand yo-"

Trimmau had learned how to deal with her. And to quiet her down, the mercurial maid quietly materialized a pacifier using a bit of magic. Using it, she shut the Big Baby up, reducing her tantrums and her whining to little more than shocked sucks. Which was much appreciated. It cleared the air, and let her think straight.

After that, she started to wipe her down. Almost as if she had always been configured to be a caretaker, it was easy for the maid to reach into her dress and pull out everything she needed. Carefully wiping down her former mistress and leaving her nethers nice and spotless, with nary a drop of pee remaining...

It was humiliating to be wiped down like this. But it was also... C-Comforting? Reines didn't understand what the emotions rushing through her were like. Just that they were doing a number on her. So she blushed. She blushed very hard, trying to ignore what was happening to her at all costs. She couldn't... She couldn't afford to grow addicted or anything. She wasn't a baby, after all.

Once the Big Baby was clean, the next step was putting on her diaper. And Trimmau made sure to help her put on one of the thickest diapers in all of Chaldea. After all, she was a big bratty baby. It was paramount that nobody mistook her for anything else.

The thick diaper, which had a cute version of Trimmau printed on the front, slid underneath Reines' rear. She wanted to kick and struggle, but the pacifier in her mouth kept her nice and calm. There would be no more tantrums coming out of her. Especially not as the diaper was woven through the gap between her thighs, and then snugly secured around her waist.

It was... It was so thick that she couldn't close her legs. And not only that, but she felt even more comfortable wearing it. It was like she was... it really was like she was a big baby. But she wasn't. She was sure that she wasn't. If there was anybody that was a baby, then it was Abigail..!

Speaking of the Foreigner, her eyes lit up in delight as Trimmau turned Reines onto her stomach, so her padded rear was now facing Abigail. And with that target in her sight, the devious blonde raised her hand, and made sure to rear it back as much as she could. Before slamming it down on that butt, spanking the troublesome brat!

"No! More! Being! A! Brat!" Abigail emphasized every spank that landed on the Big Baby's padded butt with another loud word. Because she was going to spank her lesson into her. She really needed to learn it. Because otherwise, she might be a big annoying brat again. And then Abigail would have to make more rules in her book.

Reines felt every spank. She was lucky that she was wearing a diaper now, because otherwise her butt was going to be extremely red. But she still felt the sting. It still hurt. And she still started to sob a little, which made her suck her pacifier even more.

Eventually, another hiss started to echo out. And that's when Abigail finally stopped, a grin on her face. With that, she could step away and let Trimmau lift the naughty baby onto her lap. "Take good care of her, Trimmau. And make sure to tell me if she starts throwing tantrums again. Okay?"

"I will, Miss Abigail." Trimmau noted, as she looked down at Baby Reines. "Wave goodbye to Miss Abigail, Baby Reines." She said, all while gently patting her on the head and rocking her back and forth to make sure that she could slowly recover from the sting of being spanked.

Reines sniffled, and slowly looked towards Abigail. She waved, as Trimmau had said that she should. Not because she liked Abigail, but because she feared she would get another spanking. She really was a big baby, as all of that adulthood had been wiped away and replaced by a compliant infant. An infant whose diaper was nice and soggy, really showing how little control she had.

Satisfied with the results of this prank, Abigail decided to pluck a piece of chocolate from the plate that Trimmau now left alone, and then wander off by her lonesome.

Another one down, so many more to go!

---

"AAAAACHHHIIIILLEEESSSS!"

Abigail was wandering down the halls of Chaldea once again, pouring through her mind as she tried to figure out who she should prank next. It really wasn't easy. Because a lot of her fellow Servants were actually kind of nice. And while she had used Lanling to experiment, and Reines had honestly deserved it, there were very few that really seemed like they deserved to be pranked. Maybe she should just-

"Excuse me, Abigail! Watch out for Penthesilea!"

Just as she thought that she wouldn't have anybody to prank, she saw Achilles run right past her. Oh dear. He had angered that Amazon again, hadn't h-

"ACHILLES!"

One moment, Abigail was standing there. The next, she was on the ground. She had been rammed into by Penthesilea, who hadn't even tried to look before she ran. Not that anybody would expect her to look where she was going when she was busy rampaging. It still hurt to get knocked down, though!

"Ow..." Abigail pouted as she looked at herself. Nope, no real damage. Just a smidge of dizziness from being knocked off her feet. And as she looked back up, Penthesilea had stopped. There was a slight blush on the Berserker's face, as if she realized that something was wrong, but she hadn't tried to help the girl up just yet.

She was really too angry for her own good. That was more than enough reason for Abigail to prank her. And teach her a lesson at the same time. So she started to write in the Baby Note, writing really quickly so she was sure that Penthesilea wouldn't try and run off again before the effects kicked in.

"Are you alright, Abigail?" Finally, Penthesilea actually said something. Though at that point, she wasn't sure what the girl was doing. "I'm... I'm sorry if I hurt you. It's just-" She paused, as veins started to pop. Oh. Oh yes, she was chasing that bastard! Why had she stopped!?

Abigail finished scribbling, exhaling deeply as she stared at all the rules on the page...

Penthesilea

-Penthesilea needs diapers. Always.

-Penthesilea fills her diapers whenever she gets mad.

-Penthesilea can't stop filling her diaper in anger whenever she thinks about Achilles.

-Penthesilea babbles like a baby whenever she gets too angry.

It was a simple set of rules, but they were going to be more than enough. After all, she was a simple and angry kind of girl. It was practically impossible for her to avoid triggering one of them.

"ACHILLLEEEEEESSSS!" Penthesilea roared as she tried to sprint down the hall. She had delayed long enough. This time, he was going to pay. For every single thing he had ever done to her, or would later do!

At least, that's what she was going to do. Then she felt something thick between her thighs. Something extra puffy. Strange, what was stopping her from running? Not only that, but an obnoxious crinkling sound started to ring out. It was very frustrating to hear. Maybe if she looked down, then...

Shock filled Penthesilea's eyes as she saw what was wrapped around her waist. It was a diaper. But... Was it... Shocking? The shock of wearing it quickly faded away as the words written in the Baby Note became part of reality. She always needed diapers. It was just something that Master had recommended to her. After all, she had notoriously terrible control over her bowels. But it wasn't her fault that she always needed to go poopy. It was him! It was...

"ACHILLEEEEESSS!" Her anger was stoked once more. And as soon as it did, she felt the tiniest tremble inside her stomach. Barely even aware that she had triggered yet another rule before it was too late.

The mushy sound of her bowels evacuating themselves echoed through her ears, accompanied by yet more of that annoying crinkling. And by the time she noticed it, it was already far too late. Her diaper had gone from pristine white to a deep shade of brown that would make it utterly impossible to hide what she had done. And it was all thanks to her anger...

And yet despite the fact that she had just filled her diaper, despite the fact that it was very obviously sagging behind her, she couldn't stop being angry. Because Achilles was that much of an infuriating presence in her mind. "AWILLEWSS!" It was getting to the point where she was lisping while screaming, because she was nothing more than a big angry baby who had to babble when she got angry.

The angrier she got, the more she filled her diaper. To the point where she was completely grounded within a few minutes, the sound and smell of her diaper grew more and more intense. Squelching drowned out the fluffy crinkles from before, as she tried to futilely push herself along the ground. Even as she just kept packing more and more poopy into her diapy...

Abigail grinned as she watched it unfold. It was beyond embarrassing to watch. But that was what made it so enjoyable. "What's the matter, Penthesilea? Is the Big Baby throwing a tantrum because of that big meanie?" She asked, stepping over as she gently pushed her foot up against that big stinky diaper. Goodness, how was she able to endure that..?

Penthesilea rapidly nodded. "Achilles... Bwad!" She couldn't really muster up an angry scream at this point. She was well and truly pooped. No matter how much she wanted to hunt him down, her body still had some form of limit. And the way she was weighed down by her diaper certainly didn't help. "Diapy... Stinky..!" At least she was aware of her current condition. Good. Her prank wouldn't have any merit if the babies she made weren't aware of what was going on.

"That's right. Diapy stinky." Abigail said, patting the stinky amazon on the head. "But you know, maybe if you weren't as angry at that big meany as often, you wouldn't make as many stinkies. Remember what Master told you? You make reaaaally big poopies if you get reaaaally mad." She was having a lot of fun rubbing it in. Especially since there was no way for Penthesilea to avoid it.

"Bwut... Bwad!" Penthesilea tried to imply that her situation was acceptable, because Achilles was a bad man. Which just resulted in her diaper audibly squelching as she was forced to push out another log. The Baby Note made sure that she could just keep pushing as long as she remained angry. Which just served to add to her humiliation. She didn't like being poopy. What kind of Baby actually liked being poopy?

Abigail grinned as she continued to condescendingly pat the adorable Baby on the head. "Well, if you're going to keep throwing a fit, then you're just going to have to stay stinky. Once Master's back from her date with Lanling, maybe she'll give you a change." She snickered. Oh, it was fun to tease and prank people. Honestly, pranking Penthesilea was exactly what she needed. Now she knew exactly what she had to do. Now she had one more victim in mind...

"Nooooo!" Penthesilea wasn't satisfied with that answer. She wasn't even close to satisfied. But as she kept getting angrier and angrier, she just kept filling her diaper more and more. It was less like a diaper at this point, and more like a beanbag. How it was able to handle that much mess was probably due to the Baby Note...

Either way, she'd be stuck in it until somebody stopped by and tried to help her. Because Abigail was much more interested in satiating her own whims and needs. And that meant going off to check on one of her fellow Foreigners. One that definitely needed time in diapers, since it'd suit her a lot.

Abigail skipped off, giggling as the sound of poopies filled the air once more...

---

"Hmmm... Is this... right..?"

Van Gogh muttered as she put her brush to the canvas. She had only just started to pick up the habits of the one she had been merged with, so she was still inexperienced in a sense. Sure, she could use his skills and knowledge and memories during battle because she was in a much more dangerous situation. But painting for leisure..?

It was something that she still needed to get a hang of. Especially since she was a mere nymph in her original life. So this was something mostly alien to her, despite what her memories were telling her.

And little did the painter-nymph cross know, but a certain devious girl was currently watching her with a careful eye. Of course Abigail wanted to check in on one of her Foreigner friends. Because they were very good friends of hers. She wanted to help them just as much as she wanted to prank them.

Van Gogh? She was probably one of the ones that needed help the most. And by helping her, she could help some of the others as well. In a way, they were all minions of those outer gods. So it was a good idea for them to stick together, so they could break that minionship and become independent in some way.

"Let's see... What'd be good for her..?" Abigail muttered to herself as she wrote down the girl's name on the page. All while thinking to herself. What could she do, what could she do... Was she stumped, because her prank was going to be a bit more well-natured?

She kept on thinking to herself for a bit as she gazed towards the painter, who was having just as much trouble. It seemed as if they had hit a mutual roadblock. Abigail couldn't figure out what kind of rules to write down, and Van Gogh couldn't figure out what to paint. It was something that they both had to get over...

It was then that it hit her. One of the things that painters painted lots of was... Portraits, right? Then, if Van Gogh was to paint a portrait of herself, maybe she'd get some inspiration. Heh, that was a great idea. She just had to write down a few rules, and then...

"It's no use... What should I paint..?" Van Gogh muttered to herself, truly in a rut. She didn't have any idea about what she should paint. Maybe... Maybe just herself..? No, that wouldn't be enough...

Abigail looked down at the Baby Note, and let her grin spread far and wide...

Van Gogh

-Van Gogh is a big baby and loves it too.

-Van Gogh is very good at painting with her fingers.

-Van Gogh is very talented with her paintings.

-Van Gogh really loves painting herself and her big diaper.

-Van Gogh starts to use her diaper whenever she gets too happy.

-Van Gogh sucks on her thumb whenever she can.

The rules were very skewed, but they helped a lot too. After all, a girl like Van Gogh who was naturally inclined towards depressing moods due to the nature of her existence... She could really just use a bit of blissful happiness. And that meant that it was best for her to just lose herself in the act of painting. And what better way to lose herself in painting than to be a big baby? It was the best prank and the best king of help that Abigail could think of. Now she just needed to watch.

Suddenly, Van Gogh felt a shock of inspiration pierce through her. Maybe... Maybe she had thought wrong. Maybe she really did just need to paint a picture of herself. All she had to do was put the brush to the canvas and start painting, and the rest would come naturally, wouldn't it?

With a deep breath, the artist stuffed... her finger... into the paint that was lined up in front of her. She didn't think much of it, especially not as she started to paint on the canvas in front of her.

Sure, her fingers being used as her brush made it a lot harder to paint precisely. But she couldn't help but giggle slightly as she did so. It was really fun to just rub her finger up against the white and make it change colors. It was really, really fun. So fun that she couldn't stop herself from painting more and more...

She didn't notice any of the changes that were happening to her. Whether it was the diaper wrapping its way around her waist, or the fact that her hair looked a lot messier, or the fact that her clothes were disappearing and a few paint splotches were appearing on her body. She was like a carefree baby that just liked playing with paint. It was completely normal to her...

Only as the colors on the canvas started to take shape did something click in her mind. Despite the seemingly random way that she was coloring on the canvas, the colors were lined up in such a way that they kinda looked like her if she squinted hard enough. But something felt like it was missing. Her clothes, perhaps..?

Why would she paint herself without any clothes? And for that matter, she hadn't really colored in her waist either. It was like... Hold on, why did she feel a draft?

"Ah! W-What's going on!?" Van Gogh cried out as she finally took a look at herself and realized the truth. She was naked. Well, just mostly. She was wearing nothing except for a diaper. A very cute diaper that was covered in several splotches of paint, no doubt due to how she had been fingerpainting. At least the diaper wasn't used...

As she stared at her diaper, she couldn't stop herself from putting her thumb in her mouth. It gave her a lot of comfort. Perhaps too much. Either way, she had to do something. Things were going way, way too wrong. She wasn't supposed to be naked, and she wasn't supposed to be wearing a diaper, and she definitely didn't finger paint... D-Did she?

Even though she had become lucid and tried to stop herself from continuing, it was like her body decided to act against her. With her other free hand, the one that currently didn't have a thumb stuffed into her mouth, the girl slowly started to fill in the region that was missing. Slowly but surely filling out the space around her waist with thicker, browner colors. But she was wearing a very white diaper, there's no way that-

Her eyes widened as she felt a squelch between her legs. And then she stared down again, and was confronted with the fact that her diaper was now full of filth. It wasn't just a little full, it was so full that it had almost turned completely brown. It was... It was...

Van Gogh suckled harder on her thumb to try and calm down. Even though she knew that she shouldn't. It was humiliating to do something so infantile. And yet it was super comforting too. It helped calm her down despite the humiliation. Which in and of itself was a paradox. She shouldn't be... she...

Slowly but surely, her expression grew more and more blissful. It felt... Good... to suck on her thumb. Just like it felt good to mush around in her diaper. She wanted to keep going. She wanted to keep drawing. With one thumb in her mouth, and her other hand being used as the brush. She was going to make her picture really, really nice!

Abigail was watching with a smile on her face. She knew that she had done the right thing. Van Gogh was such a difficult girl to approach normally. Now? She was an adorable baby that just loved to paint. And she was still really good at painting! Though her strokes were messy due to the nature of finger painting, she was actually able to draw a super cute picture of herself. Even if she had added the diaper and made it extra messy just to complete it...

Van Gogh was very happy with what she had painted too. It was so long since she had felt this happy. So what if she was kinda stinky and made more poopy the more she filled out the canvas? She was happy. And that was what mattered most. Now she just had to put the finishing touches, and...

She swore she heard something once she finished adding the last bits of brown to her diaper. But the more she looked around, she couldn't really see what it was. Maybe it was nothing. She was really just happy with her picture, and that was all that mattered.

"Wooooow. That's a really nice picture, Van Gogh!" Abigail chimed as she came over, earnestly clapping in appreciation of the baby girl's artistic skills. "What is it supposed to be? Is that you?" She asked, more than curious to see what kind of thoughts drifted through the baby artist's head.

Van Gogh giggled as she looked at Abigail, pointing at the picture with her brown pointer finger. "Is me! Van Goh!" She couldn't really enunciate correctly due to her thumb being in her mouth. But she was happy to show off her picture. "Am cute! Right?" She was so, so happy. So painfully adorable too.

"You are the cutest and poopiest baby, Van Gogh." Abigail said as she gave the cute naked baby a kiss on the cheek and a hug, squeezing her nice and tight like an elder sister would. "I'm sure Master is going to love it." She whispered, just to add a little layer of happiness. She knew that Van Gogh loved Master just like her and all the others.

Van Gogh's eyes lit up in delight. Mast... Mommy was going to like her art! Oh, that just made her squirm all over the place as she giggled like the adorable baby she was. She couldn't be any happier. She was going to have... So, so much fun when Mommy came by to check her picture. And thanks to all that happiness, her diaper grew a little heavier...

She was just... Adorable. There was no other real word for her current self. She was one of the most adorable babies that Abigail had ever seen. And she had seen four thus far, she had some grasp on how adorable babies could be.

"Now, be good while you wait for Mommy, okay, Van Gogh?" Abigail said as she pecked her on the cheek again. "And make sure to tell her that I took good care of you for her. Okay?" She didn't really take care of her in any way. But she was more than happy to let Van Gogh be the one to point Master in her direction. Perhaps out of a bit of remorse? Or just because she was satisfied. Either way, she couldn't help but smile.

Van Gogh nodded rapidly, before waving goodbye to the 'older' Foreigner. "Bai bai!" She cried out, giggling as she looked at her painting once again. Just looking at it filled her with all sorts of joy...

Abigail smiled one more time, before leaving to find a new victim...

---

"Who to pick now... Who to pick now..."

Abigail muttered. She had picked a bunch of fun people to prank. And yet it still felt like something was missing. Besides, she didn't know what Foreigner had given her the book in the first place. Maybe she should figure that out first-

"Y'know, I expected you to cause chaos when I gave you that book. But you're not exactly causing problems, Abby."

Abigail blinked, as the one that had left the Baby Note to her suddenly appeared out of thin air. It was that AI that Master had brought home... BB! Wait, since when was she a Foreigner? "Wait, you wanted me to cause problems?" The words she said then registered, as Abigail tried to hide away the Baby Note...

"Duh. I made the thing and made sure to tie it to the collective network of Saint Graphs in Chaldea. That's why it was so effective." BB said, brushing her hand up against her hair. "Now, hand it over. You're not causing enough problems, and you even gave Master away to that sissy. So I'm going to make sure that she's going to try and fix things."

Abigail looked at the Baby Note, then at the purple-haired AI that spawned in front of her... And before the latter could really do a thing to stop her, she flipped open the Baby Note and started scribbling. She wasn't about to give it back to her. Not when she still had lots of fun planned!

"Hey! Give that back already!" BB cried out as she tried to reach for the Baby Note. But it was already too late. She could feel something being loaded into her consciousness. "Ssstoo... sto..." She couldn't really work her mouth once it all started. Not without suckling on the pacifier that formed and attached itself to her lips...

In an instant, thanks to Abigail's quick writing, the devious BB had been completely neutralized. Dressed in an adorable pair of overalls that completely replaced her sexy look, having her hair tied into a pair of cute pigtails, and padded to the point where the buttons on the butt of the overalls were about to pop and reveal it. She was completely infantilized in a few seconds. All while she just stared at Abigail, as if she didn't quite grasp what had happened.

"How adorable." Abigail said, as she gently pet the girl in front of her. "I'll be keeping this for now, BB. So you just enjoy babyhood, okay?" She chimed, as she proceeded to walk off and otherwise ignore the girl.

And she was right to ignore her. Any affection shown towards the girl made her suckle her pacifier harder, and immediately fill her diaper to the point where it browned in a few seconds. A simple rule that would keep her from stopping Abigail's fun. That's what she deserved, after having foolishly given her the note in the first place.

Abigail giggled as she looked at all the empty pages still left in the Baby Note. How many more would she be able to make before Master would stop her..?

Only time could tell...