[Mental Regression, ABDL, Hypnosis, Diaper Use]

"I am grateful for your presence, Azuki-sama. While my functions have been reasonably restored, this kind of task benefits from an extra set of hands."

"I owe the Professor, so of course I'd help. Besides, I remember the lab like the back of my hand."

"Do you now? My memory banks may not be operating at their full capacity, but I distinctly remember that you could not find adequate hiding spots when we played together. You also had a lot of trouble finding me when it was my time to hide."

"S-Shut it, it's just because you're good at it! It's hard to find you 'cause you blend in! And it's really hard finding someplace to hide when you can just see through everything!"

"Even all this time later, seeing you flustered over your inadequacies brings me joy. Thank you, Azuki-sama."

"M-Mmph, let's just clean this lab up already..."

Two yokai were currently busy dusting off and cleaning up throughout an abandoned and rather thoroughly trashed lab. The culprit was long gone, but that didn't mean they could skimp on the menial task of fixing everything she had broken. Even if the Professor who owned the lab was probably off getting laid while they were doing all the hard work.

The fleshier of the two yokai was Azuki. A former human turned into a Yokai thanks to the love she received from the inhuman ones, compared to being tossed out into the snow to starve to death by her own kin. The only thing that tied her to that life was one of her feet having been twisted off and replaced with a peg, though she wasn't bothered by this. She could handle it all, even with one good leg.

Her companion was one of many, the Ashime. A karakuri yokai that had been cherished by the Professor, though she had seen better days since she had been responsible for defending the lab from the one who trashed it. And while she had been restored thanks to the efforts of a good youth, you could tell that she was still operating with lowered parameters. Her extensive repairs were still far out, at least for the time being.

"You were very cute when you were the size of my thigh, Azuki-sama. I remember holding you in my arms, letting you rest against my chest. Would you like to try that again?" Ashime asked, all while carefully putting everything back where it belonged. So much research partly destroyed that the Professor would have to redo and note down once more. But if the lab looked the best it could, then at least her mood wouldn't be down in the dumps.

Azuki blushed a bit, the subtle crimson contrasting her otherwise red skintone. "D-Did getting trashed turn on your teasing subroutines or something, Ashime? You've never been this direct." She muttered, while kicking a table out of the way so she could make it over to one of the mostly untouched walls. She could rest against that wall a little and catch her breath...

Though as she tried to rest, she noticed a picture hung up on the wall. And she couldn't help but blush a little more, though this time it wasn't due to her shame at being teased. This time it was a nostalgic blush, because it was a picture depicting her with Ashime. One of the pictures they took to measure her growth. "The Professor really kept these around?"

"Of course. Though she was not your caretaker, she took great pride in seeing you grow up." Ashime said as she came closer. "Though I do not know why this was the one she chose to keep displayed. The one right before you graduated from your time as a child." She muttered, closing her eyes ever slightly as she seemed to scan her memory banks...

Azuki nodded a little as she picked the picture off the wall, slowly resting against the wall as she remembered those days. Compared to the life she lived before she met the yokai that became her family... It was like she was living in heaven. That was how much fun she had, each and every day she spent together with the lot of them.

Unfortunately she didn't get to lean for long, because the wall suddenly shifted behind her in response to her back leaning against it. Prompting Azuki to fall right onto her butt as it parted, with the red-skinned yokai letting out a very displeased groan.

"On second thought, I remember why it was so difficult trying to find you." Azuki muttered as she slowly got up, using the wall as support to make sure that her peg got proper footing before she lifted up completely. "It's because the Professor hid all sorts of secret chambers around the place..."

"Indeed. I remember the adorable look you had on your face when I popped out of one of these chambers. You were scared witless. You didn't look at me for an entire day after that. You hurt my feelings quite a lot as a result, Azuki-sama." Ashime said, chuckling softly as she looked into the room beyond that secret wall. Those pastel colors within were familiar, and yet she couldn't quite understand why. It seemed like the specific memories associated with that room were missing from her memory banks...

Azuki rolled her eyes a little while her blush remained bright. "You scared me, of course i didn't want to look at you." She muttered, while turning her head to look into the strange chamber. And then blushing even more so as she noticed that it was an extremely exaggerated nursery. Bright pinks and yellows plastered all over the place. Tiny furniture meant for babies... To say that she was shocked at what she saw would be an understatement. "H-Hey, Ashime, did the Professor ever adopt anybody? If not, why the hell does she have a nursery?!"

Ashime was busy trying to scour through her memory banks in response to this, before the sight of Azuki entering said nursery caused something to click within her mind. A Human had entered the Nursery. Which meant that she had to adjust her personality modules accordingly. She wasn't supposed to tease an infant, after all.

"Azuki-tan." Even the way she addressed her fellow yokai had shifted. After all, she was but a lost child. That was why she was a yokai at this very moment. An infant human that had turned yokai thanks to their caretaking. "Why are you standing?" She asked, in a tone that sounded so maternal yet disappointed at the same time.

Azuki blinked as she heard that. "Eh? What do you mean, Ashime? I've been able to stand for a long time." She said, though she naturally started to back away into the nursery. She didn't want to be caught off guard if her friend tried something.

"Infants aren't supposed to stand." Ashime said a bit more firmly. "You still haven't grown to the point where I can consider you an adult, Azuki-tan. In fact, you're not even wearing your diapers. What would happen if you end up making a mess?" Though her words were quite strange, she thought that she was just showing proper concern for somebody as lost as Azuki.

Azuki grit her teeth a bit as she heard all of that. Okay, things were definitely way wrong now. Just what had the Professor done while she wasn't spending time at the lab? Designing a nursery just for her, making Ashime act this weird... It was all wrong. "Ashime, listen to yourself! I've not been a baby for years!"

"Yokai infants live for hundreds of years, Azuki-tan." Ashime quickly countered, all while stepping closer and closer. All while the wall that had led into this nursery closed behind her, trapping the karakuri yokai in the same room as the baby she wanted to care for. "Please. Sit down."

As Ashime issued a very reasonable request, a soft tune started to echo through the nursery. A tune that immediately started to sink into Azuki's head, prompting her vision to grow blurry as it looked like there were way more Ashime than the single unit right in front of her. Damnit, what was happening to her..!?

"I-I'm not... going to do what you say..!" Azuki tried to resist the tune inside her head, but her resistance just caused it to intensify, and before she had the chance to put up another feat of impeccable resistance, her red butt found its way right onto the extremely soft floor. She couldn't pull herself up. Not just because there wasn't a wall to stabilize her when she needed to get her footing, but because that peg couldn't even really remain stable on the extra padded floor.

Ashime smiled as Azuki sat down on the nice floor. "Good. You'll be an adult in no time, as long as you do what your caretakers tell you, Azuki-tan." She said, all while scanning the room for a couple of supplies. Whether it was the diapers that she needed to fit onto the baby, or something else that indicated her current progres.

Indeed, a cursory scan of the room revealed a potty training chart. Azuki's cute little face was plastered at the corner as well, with plenty of smiling faces drawn in for every week... Until the very last one, which had a streak of frowns. It seemed like Azuki had been a very bad girl...

"Azuki-tan-" Ashime said before she very briefly jolted, a bit of smoke rising out from her ear. "You've been a very bad Baby." She continued, approaching with a displeased look on her face. "Trying to act like you belong out of diapers. But not to worry. I will ensure that your progress remains stunted, for your own sake."

Azuki glared up at Ashime, struggling against the power of the tune running through her head. "Ashime, you big... big meanie..!" She tried sounding more mean, but the only words that wanted to slip out from her mouth were more childish ones. "I'm nodda baby! I'm a big girl! I don't make poopies and I don't need diapies!" But she could still throw a tantrum, kicking her legs against the floor to try and get her way.

Though she tried to put up the front of being a big girl, all it took to silence her little tantrum was a stern glare from the karakuri yokai, which prompted Azuki to quiet down and just pout. All while she watched her robotic momm- friend go fetch an extra thick diaper from one of the cupboards. Just seeing it was enough to make her cheeks flush even more red than before. Something about the diaper was awakening something inside her. Had she worn one as big as that before?

"Lie down, Azuki-tan." Ashime said, and the tune forced Azuki to obey as she quietly laid down so it was easier for the karakuri yokai to do what she had to do. Though it required the yokai to rip apart the leotard that covered her and left her completely naked in the process, it didn't last long as Ashime quietly slid the diaper underneath her plump posterior and made sure to tuck the diaper through her thighs and snap the wings shut.

Despite the size of the diaper, it was also unfathomably soft. Like it cradled the former human with such ease that she could feel every little inch of the soft padding brushing up against her skin and make her feel... R-really nice. She didn't understand why this felt so right. And it definitely wasn't because of the tune inside her head. It was just... It was like she had worn them before and grown really used to them. But that couldn't be right. She hadn't worn one of these before. Her memories told her that she hadn't...

"Azuki-tan is turning into a Good Baby very quickly. Much better than when you were fussy and thought you were an adult." Ashime said, as she showed the youthful baby the potty training chart that had her younger face plastered onto it. "Let us aim for a perfect month of pure success regarding your untraining. Alright, Azuki-tan?"

"N-Notta baby." Azuki muttered. Especially as she looked at that chart. Though her vision had gotten really bad thanks to the tune rushing through her head, she could definitely make out that the chart was supposed to be for potty training. Which... Only added to the confusion. Because if this was right, then she had been diapered before, and she had done really good regarding potty training. So why did she...

She didn't get to dwell on that for long before a tube suddenly forced its way into her mouth. A long and elastic tube that had emerged from the floor and strapped itself to her head once it made contact with her lips. There was no way that she was getting it off without help.

Azuki tried to look to Ashime for help, but all she got was a smile as a flow of very nutritious goop poured right into her mouth. Probably one of the Professor's inventions, if she had to make a guess.

"Please remain still while the tube feeds you, Azuki-tan. This will accelerate the pace of your untraining and ensure all happy marks." Ashime explained, carefully running a maternal hand right through the padded yokai's hair as she watched her slurp it all down even if she didn't want to.

Well, at first Azuki didn't want to. Not just because it was being shoved down her throat so she couldn't really breathe or do anything, but because she didn't want to be fed like a baby. But as more and more of it slid inside, her resistance rapidly faded away. It was really tasty, and even though she could barely taste it, she could feel the effects the taste had on her mind. It was melding together with the cozy tune from before, making her eyes grow nice and hazy and her mind all sorts of weak.

Although her mind getting all nice and hazy and unattentive meant that she couldn't really notice the sound of her tummy cramping. Nor could she notice the worrying sensation of her needing to go potty. She was just so focused on swallowing all that nice goop...

Only when the tube was unstrapped from her head and tugged away from her lips did the pain really settle in, her eyes widening as her gaze turned nice and clear. The pain had almost knocked her out of her regressed state. It wasn't pleasant. It really didn't feel good.

"It seems as if the laxative is working as well as it should. Don't worry, Azuki-tan. You just need to relax, and your untraining will begin." Ashime said, all while watching a screen slowly lower from a panel that shifted away on the ceiling. A screen that would help her sweet little Baby.

"N-Nodda... Baby..!" Azuki cried out one more time before groaning thanks to her tummy throwing the biggest and baddest fit of them all. She didn't like it. It hurt lots and lots. She didn't want that meanie Mommy to be right! Even if she was a Mommy and had to be right. She just didn't want her to be right because she didn't like the pain!

The screen finished lowering right as Azuki stared straight ahead, letting her look at the footage playing on screen. Footage of... her younger self, sitting on a potty with a big diaper on, just as she did right now. Minus the potty. Of course, thanks to her mind being hazy, she couldn't notice the spiral behind the footage that was making her pay lots of attention.

"Azuki-tan, what are you doing?" Ashime's voice echoed from the footage, as she looked upon the much younger Azuki who just grinned in response. All as her diaper suddenly grew several sizes in the span of a few seconds.

"Going potty!" The young Azuki giggled, with Ashime giggling as well as it seemed to be footage of that week she flunked.

Azuki's current mind absorbed what was being shown to her, as she giggled a little herself with her eyes turning into big and bright spirals as she started pushing. It felt right. It was what her younger self did, and since that was her, and she was herself, that meant she had to be just like her. And so she pushed and pushed...

"Azuki-tan, what are you doing?"

She heard Mommy's voice again, this time in the present. And with a big and giggly grin and a bit of drool pouring down her chin, she replied with glee. "Going potty!" She chimed, pushing as much as she had to.

The sound of her diaper rapidly and violently expanding as it tried to contain all the extra big poopies that she made thanks to all the laxatives rushing around inside her stomach was practically deafening. In fact, her own thoughts were being silenced thanks to the sound of her messy poopies. Which in turn caused her to push more and caused the pleasurable sensation of filling her diaper to loop back around. Because it felt good to go potty, she decided to go potty more. Because of the sound of her diapy getting all sorts of big, all other thoughts than going potty were being drowned out, so she went potty more.

The diaper grew so big that it was on the verge of swallowing her, but that just caused the Baby to giggle with earnest glee as she rocked back and forth in her pamper. She was in total and utter bliss. Sure, she wasn't going to recover mentally any time soon, especially since she could definitely still make bigger messies, but she didn't care. She just liked the feel of going potty in her pampies!

Ashime smiled as she added a little happy face to the backside of the 'untraining' chart, starting her untraining in earnest as she went to hang it up on the wall. So Azuki could keep track of her progress.

All while giggling, thoughts of raising her to be a proper big poopy baby already flooding her robotic mind.