[ABDL, Mental Regression, Soiling, Diaper Use]

"So that's what the Shikikan wants me to do... Eheh, I thought it was weird that she hadn't come around yet."

The gentle voice of one Ayanami echoed through the halls of her naval base. It hadn't been long since she came home after her exchange program. The very same exchange program that had left her with a diaper around her waist, and a deep need to both use it and enjoy it. That was what happened after she was subjected to the Infitting procedure. A simple injection, and her bowels were no longer hers to control. Combine that with many more diapered girls adding peer pressure with how eagerly and openly they wore their dirty diapers, and she quickly fell much like they had. Not that it was the exact way that she had fallen, it was just the official story she had given her Shikikan when she returned.

And thanks to her and Akagi's efforts, mostly the latter given how she had regressed even further into open babyhood than Ayanami had, most of the girls at this base had fallen just like they had. In fact, Ayanami had helped get a few of them used to their new garments. A few hugs, a little kiss... And they would lose any sort of concentration as they let their seats sag all the way down to the floor. They couldn't recover after that, especially as they grew more and more used to sitting in their dirty diapers.

But there was one that had escaped that fall. Not that she had escaped the Infitting treatment, the drug that was used for the procedure had been widely spread around the base. Whether it was in the water that the girls drank, or the food that they were served. It was utterly impossible for a shipgirl to avoid having their control over their bowels and their bladder degrade to the point where they needed the diapers. And the peer pressure of everyone around them messing themselves... It would serve to wear them down even further, if the drug hadn't done it by that point.

The only one that had managed to escape completely giving into the pleasure of filling her diaper? A grey-haired Destroyer, not unlike Ayanami herself, nor the only one that had tried to resist the exchange program's ulterior motives back at Maidens' Dream, Yukikaze.

The resisting girl was Kawakaze. An elegant and experienced fox-like shipgirl... And a prideful one. It was that pride that gave her some resistance to the compound, if only slightly. But that resistance wasn't tolerated. And that was why Ayanami had been given a very special task...

Break Kawakaze's spirit, and make her a stinky baby. Just like Ayanami and the others...

---

"They're all awful..."

A grumpy sounding voice echoed out through the pastel nursery that she had been trapped in ever since she started showing resisting behavior. It wasn't her fault that she didn't like the diapers that everyone wore, she was a shipgirl with prestige and experience. Did they really expect her to take this infantile behavior and the related garments lying down? Apparently so, given that she had been tossed in here with naught as much as a single glance of mercy.

Despite this, Kawakaze didn't stop trying to resist. Even if they were going to isolate her, even if they were going to shove her into a crib that she couldn't get out of thanks to the Infitting drug having hampered her ability to stand up for any sensible amount of time, even if they had stripped her out of her usual outfit and replaced the elegant mixture between shrine maiden and school girl aesthetic and replaced it with little more than a black and white onesie with a nice light blue bow tied around her neck... She wasn't going to take all of this sitting down. She would keep showing them what it meant to try and suppress her. As long as they tried to make her submit, she'd... She'd...

*FRRRRT*

Kawakaze's cheeks flushed bright red and her monochrome fox ears pinned themselves against her head as a disgusting sounding wet fart left her rear. Of course. Whenever she got frustrated, her body had the nasty habit of choosing that exact time to try and let loose. Not that she could stop it. She had lost all sense of control down there. All that she could do was live with it. Unless she found somebody that could reverse it... If there even was anybody that could. And if that very same somebody would even take her seriously in this incredibly infantile outfit.

Upon gently sitting up, she was relieved to feel a complete lack of anything stinky down below. By some form of miracle, combined with rather divine timing... She wasn't messy. At least not at the moment. If she could just stay dry until she figured out a way to get out to sea without making her bowels move around too much, so she could try and find somebody that could help her... Then...

"Oh my. Little Baby Kawakaze is already awake. And here I thought you'd nap like a Good Baby, instead of the Bad Baby that you've chosen to be."

Ayanami's voice rung out as she shut the door behind her, keeping it nice and locked and shutting away the poor onesie-clad Destroyer's escape route in the process. That was the only way in and out of the Nursery. She'd have to unlock it, and considering the monochrome mittens that decorated her feet and her hands, that was all but impossible.

"Go away." Kawakaze muttered as she collapsed back onto her back. She wasn't about to humor Ayanami. Not after she saw how much she loved those diapers. And how much she loved to spread that love. She could still remember what had happened to the other girls that greeted her. How they got trapped underneath that diaper... And how they were some of the first to fall to the drug's influence, after it became a mandatory part of their diet. Besides the Shikikan enabling all of this, and the fox that had helped smuggle the compound to this base... Ayanami was the most dangerous girl out of all the diaper loving babies...

Ayanami softly smiled as she stepped over to the crib, diaper crinkling behind her, adding a foreboding sound to the scene at hand. "That's not very nice, Kawakaze. Didn't our Shikikan tell you to be a Good Baby, and treat your fellow Babies like they were your best friends?" She said, her voice keeping calm, despite the fact that she had one of the biggest diapers on the base wrapped around her waist. That thing crinkled no matter how she moved... And she loved the sound. So, so much.

"I'm not a Baby. I'm a shipgirl. Just like all the others that you've brainwashed with your infantile idiocy." Kawakaze scoffed, gritting her teeth as she managed to stand up. All so that she could support herself on the railing of the crib. It was hard for her to get out, especially since the railing reached all the way up to her chest, but it would serve its purpose as a support for the time being. "Just like you were, before you went to that awful base!"

Ayanami blinked a bit as she listened to her. And that smile grew bigger. Suddenly, her pride made so much sense. That explained why she hadn't fallen prey to her diapers and her messes... She still believed herself to be an adult. She believed that she was still a ship meant for naval warfare. Against who? The other nations? Possibly, though there was no way that something like that would happen in this day and age. Especially not according to the Admiral that had arranged for her fall. The compound was going to spread... And they were all going to end up babies one way or another.

So what could she do except teach this silly girl what the truth of the matter was? A simple push was all it took, the diapered Destroyer pushing the girl in the crib back down onto her back, with a loud *FRRRRT* echoing from the incontinent girl's rear as she made contact with the floor. And the blush that appeared on her cheeks after that... It was delicious.

"You're not a shipgirl, Kawakaze. You're a Baby. And you had better start acting like it. It's all for your own good." Ayanami said, her voice turning stern as she turned towards one of the tiny fridges that lined the walls of the Nursery. Picking out a bottle from within, she easily climbed over the wall of the crib and loomed over the poor Baby laying on the padded floor. For a true Baby like herself, one that lived in harmony with her destroyed bowels, something like this was easy. Kawakaze was holding herself back by not giving in, making herself weaker... But it was alright. Ayanami would help her.

Kawakaze grit her teeth as she tried to crawl away from the other Destroyer, but the lack of good footing and the fact that she was panicking as she tried to scoot away made it hard for her to truly move. Which meant that it was incredibly easy for Ayanami to collapse on top of her, pinning her to the ground no matter how hard she tried to struggle. "G-Get off! Get off me!" She shouted, thrashing her arms and her legs around. But she wasn't hitting anything. She was just flailing around wildly with no intended target... Just like a baby would do when she felt frustrated.

"Ssssssh." Ayanami hushed the cranky Baby as she grabbed her face, pinning her head in place for a brief moment before she stuffed that nipple-topped bottle of milk into the Baby's mouth, watching as she slowly but surely started to suckle the milk down on instinct. As much as Kawakaze wanted to deny it, she had already started to accept part of the training that made her an ideal Baby. And that meant that she drank whatever she was offered. No matter how dangerous, no matter how much that drink would ruin her insides. It was delicious milk, and Babies like her needed the nourishment to grow big and strong...

Kawakaze did try to grab the bottle once. But her mitten-covered hands started to slide off the second she made contact. Leaving her to just suckle as Ayanami held the bottle in place. It was... It was nice and cool. She actually preferred warm milk, but considering the way she was acting, she wasn't surprised to be fed cold milk instead.

Of course, it didn't take long before she felt the effects of the milk. In fact, she was very familiar with what it was able to do. She had been fed a bottle when she first arrived in this Nursery. It had ruined any semblance of control that she had left in her bowels. And she still vividly remembered the stench of her diaper after she finally finished unloading everything from her hole back then...

*BRAAAAAAAAAAAP* *FRRRRRRRT* *BRAAAAAAAAP*

Several wet sounding farts started to fire out from her hole in quick succession. The extra heavy dose of the Infitting compound was doing its job, making sure that she was ready to make an even bigger mess than the last time she filled her diaper. Something that she deeply didn't want to do. But what was she supposed to do? What could a girl like her do against something like this..?

Especially as she finished the bottle and the cramps inside her tummy started. As much as she wanted to try and rub her belly to try and calm them down, she didn't get the chance because a certain white-haired Destroyer decided that her face made a great seat. Well, she wasn't busy drinking from her bottle any longer, so her face was rather free. So free that it only made sense to use it as a seat.

"Aaahhh..." Ayanami sighed as her diaper practically swallowed Kawakaze's face as she used it as a place to sit. It felt nice to sit on somebody. She hadn't had the chance lately, because a lot of the other Babies were too happy to do it to themselves while she was still getting ready to fill her diaper.

"G-Get off..!" Kawakaze tried to cry out from underneath that diaper. But it was too thick. And she was getting weaker with every passing moment, especially as the *FRRT*s and *BRAAAP*s kept intensifying. She could smell herself, even though there was so much thick padding in the way of her nose... And it smelled awful...

Ayanami shook her butt, grinding that diaper further into the resisting Baby's face. "I won't. It's my responsibility, as your Big Baby Sister, to set you straight." She chimed, all while she bit her lip a little and let out a moan. "And I know just the way to do so..!"

*BRAAAAAAAAAAAAAP*

Kawakaze's eyes widened as she was forcibly blasted with a thick fog of pure filth. It was the worst fart she had ever smelled. And unfortunately she had smelled quite a few of those. But it was just the beginning. She could hear something bubbling within. She closed her eyes, and hoped for the worst to be over quickly.

Just as quickly as the fart had been blasted in her face, shit started to pour of that hole like it came from a river of nothing but pure waste. It piled on top of itself, with the stinky water getting soaked into the diaper itself causing it to grow nice and brown in a matter of seconds. All while it all weighed down on the resisting Baby.

Kawakaze was doing her very best. It was hard to resist the three-pronged assault of the milk, her existing stomach troubles from earlier, and the smell of everything weighing down on her. She wanted to prove that she was a good shipgirl. She wanted to prove that she was a good girl who could still be an adult despite needing diapers... But she couldn't. She couldn't keep it all in. Not after all this.

She whimpered and audibly started sobbing underneath the diaper that warped around her face as she felt a wet sloppy mess leaving her hole. Her own waste, her own filthy flow of shit, pouring into the seat of her diaper. It had been dry just a little while ago. Something that she was actually proud of. And here she was. Filling it again. Filling it despite how much she wanted not to. Filling it like the Baby she truly was.

"I-I'm sorry, I'm sorry..!" Kawakaze cried out as she couldn't take it any longer. The pain in her tummy, having Big Sis Ayanami on top of her, and pouring all of that into her diaper. It was the last push that her psyche needed to give up on any kind of resisting. What was a girl like her supposed to do when she just couldn't prove herself? The only answer she could come up with was to just accept what she truly was, and cry out like the Baby she was supposed to be...

Even then, it didn't really do much. Ayanami couldn't hear her. Not while she was busy enjoying the sensation of filling her own diaper with so much terrible filth. So much of that disgusting slop that she enjoyed like the naughty Baby that she was. The same kind of slop that was being filled into Kawakaze's diaper. They really were like sisters, considering how much was being packed into their diapers. An almost equal amount, both of them really proving their Babyhood...

Kawakaze kept on sobbing and trying to apologize, even as the flow of poop started to taper off. But as that happened, the violent force that was her wet farts *FRRT*ed and *BRAAAP*ed through the air, the strength making the crinkles of her wet and soiled diaper echo out through the Nursery. There was no way that she would be getting her adulthood back at this point. Not after she apologized and filled her diaper like this... She was a Baby, through and through.

"Ehehehe... Would you look at that." Ayanami giggled a little, her body trembling after she finished filling her diaper and slowly but surely stood back up. It was hard for a Baby like her, even if she had given into the compound and accepted her nature as one. It was heavy. It was stinky. But most importantly, it made her feel divine. It was what she was meant to do. It was what she had been taught to do. To be a big baby...

Just like the girl underneath her. The girl who was still sobbing a bit, as her ass finally went quiet. The wet farts went away, leaving behind the thoroughly pooped Baby. The sobbing Baby that had given into her true nature, who looked up with a sad smile at her dearest Big Sister Baby...

And like the Good Baby that she was, she had already assumed a submissive position that made it easy for somebody to change her. She had managed to grab ahold of one of the buttons on her onesie, popping it off to open it up and reveal her bosom... All while keeping her hands close to her face and her arms pinned to her side, her legs bent towards her as she let her diaper stick out as much as possible.

"I-I was a Bad Baby... I-I'll be good from now on... P-Promise..." The thoroughly broken Destroyer whimpered, her diaper sagging a little further as the last little bits of poopy poured out of her. She wasn't going to make another mess for a while. But she wouldn't try to avoid it any longer. Not after what her Big Sister Baby had done to her.

Ayanami giggled, and put a hand against that dirty diaper... And she squeezed it tight, watching as the fox-like Destroyer started to moan. As a Good Baby should, when they were getting a reward for making big messes in their diapies.

It was time to reward her for being a Good Baby. So she could train her to enjoy her messes much more.