[Mental Regression, ABDL, Diapers]

As a Magic Knight of the Clover Kingdom, it falls to Mereoleona Vermillion to carry out missions that deal with threats to the Kingdom. And due to her destructive power, it's not uncommon for her to be all alone on those kinds of missions, just as she was this time around. Not that it mattered too much that she was alone. She much preferred the wilderness, and was usually alone whenever she was out there. So a mission like this, when she was all on her own? It was perfect.

Still, the hell kind of enemy did they want her to face? They didn't really even tell her anything. Just that they were looking for somebody that had been rumored to manipulate the human body. What did that mean, exactly? Not that she was going to bother trying to overthink it, but they could've at least told her what the hell she was supposed to be looking for.

"Gotta be around here somewhere at least." Mereoleona muttered, walking through a dense forest. She was this tempted to burn it all down, to try and find the enemy before they found her. And if they were hiding, well then they wouldn't have a place to do so. Then again, she'd be ruining a perfectly good place to hunt. Maybe just a threat would do the trick.

The fire-empowered Magic Knight's Grimoire started to float beside her, brimming with burning power as she wound her arm back for a strike. All while that very same arm slowly got covered in flames resembling a lion's paw. "Hey! I know you're hiding here somewhere! Come out now, or I'll burn the whole damn forest down!" Mereoleona shouted into the skies around her, her violent temper serving to amplify the sound of her voice. With any luck, the damn target would pop out soon.

"My my. That's a rather loud tantrum you're throwing, little lady."

The flames extinguished as Mereoleona grinned, turning her head to look towards the owner of the voice that had just called out to her. And she couldn't help herself as she laughed at the owner. It was a little girl who barely reached up to her thigh in terms of height, sitting upon one of the treebranches as she looked down upon her. "Are you the one who's been messing with people, or do I need to burn the information outta ya?"

"And still so violent, even when you have a face to direct your anger towards. Then again, I suppose a big child like yourself doesn't know the meaning of restraint." The little girl said, chuckling softly as she spoke with such a mature tone to her words. To say that she wasn't what she seemed to be would be an understatement, especially as she slipped off the branch and let herself gracefully fall down to the ground. "Perhaps we should start from the beginning, then? That way, we can reach an agreement. Wouldn't that be much better than to wildly flail around like the child you are?"

Mereoleona could feel her blood boiling. You know what, screw the mission. This little lady had done more than enough to piss her off. "I got a better idea, how about you stand still so I can burn you so hard that you'll wish you took me seriously?!" The fire-wielding Magic Knight shouted as her Grimoire caught fire once more, both of her arms lighting on fire as she got ready to strike.

The little girl just shook her head slightly. Such an uncivilized girl. Well, it wouldn't hurt to humor her a bit. Thus, she just stood there and watched as those arms were being wound back before they came slamming towards her, the flames crashing against one another as she was caught between them.

"SERVES YOU RIGHT!" Mereoleona shouted, laughing as the flames extingushed, all while the girl seemingly was caught in the localized inferno in front of her. The finer details of the spell didn't really matter to her, as long as the flames only burned a human. She wouldn't be hurting the forest, and she could use it to hunt for wild animals later. And most importantly, it'd be excruciatingly painful for that extremely insufferable brat.

At least, that's what the vermillion-haired girl thought. But once she heard a soft giggle echo from the inferno, her eyes widened and she saw the outline of the girl within the flames, utterly unscathed despite how much power was poured into that spell. "What the hell!?"

"That tickles, little one." The little girl chuckled as she made a slicing motion with her hand, cutting the flame and leaving it to disappear into harmless embers. All while bringing more emphasis to her attire. Her red sundress and matching hat, and her ethereally beautiful white hair and crimson eyes... Whatever she was, she couldn't be a human. Not if the spell had been this ineffective. "May I have another? I'm sure you have more to give, instead of just pointlessly flailing your magic around like that."

Mereoleona's blood was boiling over. This little kid was making a complete mockery of her. Who was she, anyway? She hadn't seen anybody like her before. Whatever she was, she had to burn for insulting her pride this badly. "THEN DON'T MOVE, I'LL MAKE SURE TO TURN THE HEAT UP SO YOU'LL BE PROPERLY COOKED!" The violent Magic Knight cried out, the flames once again gathering around her as they started to burn so hot they turned blue.

The little girl watched carefully, and slowly shook her head. No no, this wouldn't do. If she went this overboard, she would probably burn everything down. And as much as the girl would be entertained by the way she let her powers overflow and take out an entire area... She didn't want to bring too much attention to her. Not when she could deal with the problem in a much easier fashion.

"I thought I told you to stop flailing your magic around so pointlessly, dear child." The white-haired little girl said as her eyes suddenly flashed... And just like that, the flames extingushed before the spell was even cast, cutting Mereoleona's assault short before it had even begun. "Now, how about we start from the beginning, as I asked?"

Mereoleona trembled a bit as she watched this little girl make a mockery of her. T-This wasn't supposed to happen. She was a strong girl. She was a big, strong girl. She had been big for so long that there was no way that she was being beaten by a little girl. If she was being beaten by a little girl, didn't that make her a little girl? N-No, she was definitely a big girl!

"My name is Asphodel." The little girl said, gently bowing. "What about yours, dear child? Or do I need to put your rage-filled flames out a third time before you behave?" She asked, while at the same time lifting a threat over the girl's head. Just to see if things were progressing smoothly. After all, she could see that childish panic settling in...

Mereoleona let out a yelp, uncharacteristically so. "My name's Mereo... Me-mereo... Mereole... Leona!" She was stuttering constantly as she tried to remember how to pronounce her own name. Why was she having so much trouble? It was a big girl name, it wasn't hard! It was easy for a big girl! So why was it so hard!?

"Cute. You're flubbing over your words. Just like the child you are, Mereoleona." Asphodel chimed, all while walking ever slightly closer. "And a child like you shouldn't use her powers all willy nilly, don't you think? Slinging spells that could burn people inside out is what adults do. And you're clearly not an adult."

"A-Am big girl!" Mereoleona cried out in protest, her voice slowly getting slurred as she neglected to notice that she was idly drooling. And it was getting harder to really think. Big words like her name were scary. She liked smaller words. Words that were easy to say. Just like fire. It was fun to play with fire. But this girl was really mean. She had to feel the bad part of fire!

The fire-wielding Magic Knight pouted and blew her cheeks out as she tried to use her fire magic. But all that happened as her cute little book started to ignite was a little bit of fire gathering at her fingertips. As if she wasn't anywhere close to being a threat. "W-Whys... Whys my fire so small?" She whined, glaring down at the little girl that was being so mean...

Asphodel just smiled. "You really haven't noticed? Oh, you poor, poor thing..." She mused. There was something delightful in seeing a strong girl like her just start to collapse in on herself after taking away a few of the important building blocks that made up her character. "Sit down, Mereoleona. Be a Good Girl, okay?"

Good Girl. The term rung throughout the vermillion-haired girl's head as she immediately fell onto her butt, the squishy thing cushioning the sudden fall as she looked straight into the girl's red eyes. There was something about them that made it really hard to resist what she was saying... Even though she was really mean and made her feel so weak...

"Good Girl." Asphodel giggled, all while cupping the girl's cheeks. "You mentioned that you were looking for somebody that had been changing people? Oh, that would be me alright. But I don't just change their bodies." She chimed, as her eyes started to glow. "I strip away the adulthood of any Bad Girls and make sure they have to be raised from the bottom up. And you've been such a Bad Girl, Mereoleona... Mommy's very disappointed in you."

M-Mommy was disappointed in her. B-But Mommy wasn't Mommy! Mommy was Mommy! ...W-Why couldn't she think of Mommy as anything but Mommy? S-She was a good Mommy, not a good Mommy! No matter how hard she tried to disassociate the little girl from what had been forced into her brain by her cute eyes, it was way too hard for an overgrown child like her. It made her want to burn things, but she couldn't do that, her magic wasn't working good!

The white-haired little girl watched as the panic washed over the fire-wielding girl's face. It was so adorable. She was losing control of everything. It was like the girl was drowning in the face of her own lacking maturity... But Mommy was here for her. Mommy would make sure that she was okay.

Asphodel wrapped her small arms around Mereoleona and gently kissed her on the cheek. "It's okay, little Mereoleona. Mommy's going to make you grow up to be a Good Girl. Just endure a little longer. Okay?" She chimed, rocking the poor girl back and forth a bit as she started to hum a bit. A little lullaby that should placate the big baby...

Mereoleona listened to the lullaby, and though she was getting extremely emotional over the fact that Mommy had cemented herself in her mind... She was starting to relax. The lullaby was really nice. It made her think that everything was going to be okay. What could go wrong when Mommy was here..?

The more she listened to it, the less she noticed the fact that she was changing bit by bit. It wasn't just her mental abilities that had degraded, nor her magic capabilities. No, her body was suffering much the same fate. All the muscle that she had been piling on as a result of her constant exploring and training was flattening out, degrading until her body was nice and smooth. The big baby didn't need it. She just needed her Mommy to sing her sweet lullabies. She didn't need to worry about being a Magic Knight. She just needed to be with Mommy...

Slowly but surely, the overgrown baby put her thumb in her mouth and started to suckle like the baby that she was, giggling a little as the drool poured out around it. It felt nice to suck on something. It distracted her from the fact that she wasn't supposed to be doing this. But Mommy was here. Mommy was making it all feel alright. Mommy was going to make it all right...

Mommy would...

Mereoleona's eyes snapped open as the tiniest bit of her maturity pulled its way back to the surface, glaring at Mommy. "M-Mwommy B-Bwad!" She cried out, her words coming out sounding all wrong due to the fact that she still hadn't taken her thumb out of her mouth like the big baby that she was.

"Oh? And how am I bad?" Asphodel giggled, as she let go of the big baby and walked a few steps away. "If I'm so bad, then I'll give you a teeny, tiny little challenge, my sweet little baby girl. You just have to get up and walk over here. You can do that, can't you? You're a big girl, after all."

Mereoleona was a big girl. A really big girl. A super strong big girl. It wouldn't be hard for her to get up. She just had to... Just had to...

Her eyes widened as she couldn't really remember how to make her legs work. They were swinging in different directions, but she couldn't get them to stay still. Her muscle control, and even her very concept of walking had atrophied thanks to the lullaby. All that she could do was eventually slowly crawl towards Mommy, tears running down her cheeks as she started to sob wildly from shame.

"That's not what big girls do, Mereoleona. Are you absolutely sure that you're a big girl?" Asphodel asked as she watched the girl slowly crawl towards her. She was utterly adorable like this. Her legs, her arms, her body in general. Atrophied to the point where she would be utterly useless in a fight. Her magic wasn't any better, and her mind was certainly not in a healthy state either. All in all, she was completely and utterly regressed. But there was still more that she could do.

"A-Awm bwig gwirl! M-Mwommy small, Lweona bwig!" Mereoleona cried out, all while she looked into Mommy's pretty red eyes. They were really nice and pretty and they made her head go all spinny. So much so that she didn't really notice that something was being pulled across her body, nor that Mommy was giving her nice kissies because her mind was currently focused on her eyes...

By the time that Mereoleona snapped back to reality, she wasn't dressed in her normal outfit. No, she was wearing a cutesy flame-patterened onesie that was utterly impossible for her to get out of. Why would that be? Simple, her hands and her feet were covered in a set of mittens that would keep her from making any precise grabbing motions. Even if she could use her limbs properly, there was no way that she'd be able to reach behind her and unbutton the onesie to make sure that she could look like a big girl.

But it wasn't just her onesie that was making her uncomfortable. It was also the fact that her legs were spread super far apart. By something thick. Something crinkly. Something so soft that she was tempted to go to sleep right then and there because it wrapped around her waist and her butt in such a nice way. But the vestiges of adulthood were still clinging on. Still trying to make her remember that she was a big girl. And a big girl wouldn't be happy about wearing a big annoying diaper!

"G-Gwet it off!" Mereoleona cried out, thumb still nestled in her mouth as she tried to cry out. Despite how sad she was, the softness of the diaper was enough to stop her from sobbing. Maybe it was also because Mommy had been kissing her lots and lots and wiping the tears away...

Asphodel smiled a little. "No. You've been a really bad girl, Mereoleona. This is what you have to deal with. Your newfound infanthood. Don't worry, I'm sure your friends will be happy to raise you again. They won't see you as anything except the baby you are, after all." She chimed, before sighing sweetly and snapping her fingers. "But I suppose... If you're a Good Girl who begs Mommy to take pity on you... Maybe Mommy'll make you a little older than an infant. Give you a tiny head start."

In that very moment, Mereoleona felt like all of her adulthood was getting back to the forefront. She could... She could fight back against that girl. She wasn't even thinking of her as Mommy. She had the chance. But would she beg..? She... She..!

Mereoleona grit her teeth as she did her very best to suppress her natural anger and laid her head against the wet ground below. "Please. Please Mommy. Please don't make me stay a baby." The vermillion-haired baby muttered. She really, really wanted to be back to normal. Even if... Even if the diaper was nice and soft...

Asphodel could see the blush forming on the edge of the girl's cheek. And she snapped her finger once more, sending Mereoleona's adulthood swirling down into the drain of her babified mind. "I'm a Mommy of my word. You're not an infant any longer, Mereoleona. You're an adorable one-year old. Aren't you proud?"

The only way that the vermillion-haired girl could feel something was different was that her diaper had gotten a little thicker. Or rather, she had an extra diaper layered on top of the normal one. Was that Mommy's way of making her age? Giving her another diaper? W-Was she going to stay in the same diaper for a year?

She didn't get an answer, because Mommy disappeared right then and there. Leaving Mereoleona to deal with her new life as a baby. A life that forced her to suckle her thumb almost immediately, hoping that somebody would find her...

Hoping that they'd be nice and give her cute kissies like mommy did.