[ABDL, Diaper Use]

"And what do the two of you think you're doing?"

The Royal Navy naval base that laid far away from the front lines had been experiencing its fair share of ups and downs lately, putting several of the girls that served at the base on edge. One of said girls was the C class destroyer Cygnet, the 'eldest' of the three that were assigned to the base. Currently however, the white-haired girl was staring at her two sibling ships who seemed to be busy trying to clean something up.

"E-Eh? What's the matter, big sis?" Comet's brow slowly grew full of sweat as a wave of worry coursed through her, for reasons that the eldest sister could probably guess if she took the time to try and figure out the exact details.

"Yeah, don't give me that look, Cygnet!" Crescent on the other hand huffed and crossed her own arms back, being a feisty and stubborn young girl that wasn't about to take orders or even any kind of admonishment from a girl like her 'elder sister'. "You know darn well that we're not up to anything bad. You've heard what happened to Javelin, there's no chance in hell we want to disappear!"

The white-haired older sister raised an eyebrow for a moment as she stepped closer, lowering her guard as she noticed a crumb of something on Comet's cheek. "...Well if you two weren't up to no good, what were you doing then?" She asked genuinely, only to shoot a brief if meaningful glance towards the blonde middle sister. "Don't just talk about Javelin as if you believe the rumors. She's probably fine, just resting after the incident that cut her height in two."

Crescent remained huffy as the youngest sibling's eyes lit up. "Oh! Oh oh oh oh! We wanted to tell big sis how much we loved her!" The immediate change in her expression from worry to outright beaming pride was stark yet not the kind that was ultimately unwelcome. After all, it could hardly hurt for Comet to remain a worrying little girl for too long. 

"How does that explain th-"

Before Cygnet had a moment to ask about the crumbs, she suddenly caught a whiff of something delicious in the air. Something that pulled her away from her two sisters as she stumbled her way into the kitchen, following the delicious scent as the two girls followed behind her while whispering amongst themselves.

"She's not going to realize there's a problem with the fish, is she?" Comet muttered under her breath as she held her blonde sibling's hand for comfort...

"Of course not, you idiot. When's Cygnet ever been able to tell tastes apart with how much of that stupid dish she eats?" Crescent scoffed briefly before the two of them caught up to their older sibling, who was practically salivating at the sight before her.

The white-haired eldest sister turned towards her two siblings, smiling from cheek to cheek as a few happy teardrops rolled down her face. "Oh, Crescent, Comet... You really didn't have to do this for me. I could've just asked the Admiral to order some..." The sheer act of the two making her favorite dish was enough to touch her heart and then some, given the way her tummy slowly grumbled with need.

"Yeah yeah, enough congratulating, get eating. I didn't mess up trying to bake the thing the entire night just so you could cry over a breaded fish!" Crescent pouted as she spoke, acting like the typical sort of tsundere her character reflected. Of course, it was all an act. The better she acted, the easier it would be for the older girl to fall for the prank they had prepared so meticulously.

Comet on the other hand just gave her sister a big ol' hug and a kiss on the cheek. "Dig in, big sis! Trust me, it'll taste amazing! We went through sooooo many fish trying to get it right..." The green haired girl added onto the supposed effort that had gone into the meal before she pulled back as well, taking a stand besides Crescent as she waited for the eldest to dig in...

With a brief and honest "Thank you both so much..." leaving the white-haired sister's lips, Cygnet dug in. Moments later, the entire dish, chips and fish and all were devoured. She couldn't keep herself from just digging into it in such a quick manner, given all the love that had been poured into it to make it taste that much more delicious. Of course, only as she swallowed the breading did she notice something felt off about the dish. She brushed it off, thinking that her siblings couldn't possibly have tricked her in such a vile manner, so she ate it as normal...

The seconds ticked by, prompting the two younger sisters to look between themselves, hoping that the effects of the 'special ingredient' would kick in at any point, but it didn't seem to have had an effect on the older girl... 

Or rather, they didn't expect for it to end up having the effect it did. It took but a few more moments for a loud groan to echo forth from the older destroyer's tummy as the secret ingredient caused a hissy fit within her belly. "HnNhahahghhhhh..." Cygnet groaned as she leaned over the table, gasping as she tried to figure out why her belly was starting to twist and turn in such an awful manner...

"S-Shouldn't she just be darting for the potty, Crescent..?" "D-Don't ask me, Akashi didn't tell me how much I was supposed to use..."

The whispers between the younger siblings could just barely be heard by their eldest, not that Cygnet had any sort of time to concentrate on the fact that they had actually tricked her like they usually did. No, she was far too focused on noticing the pressure moving from her belly and down into her butt. "No no no no no, don't!" 

Her protesting was ineffective as a cute if loud brassy sound fwumped right out of her bottom. The bout of gas caused both of her younger siblings to plug their noses as they could tell what was going to come. Especially as their elder sister started gasping like an animal in need.

Slowly but surely, the could hear the distinct noise of something slipping right out of that bottom hole, pushing its way into the seat and subsequently spreading its way out and around the older girl's bottom. The laxatives were doing their job as well as they should, but it just meant that poor Cygnet could feel the mess pulling its way out of her ass with an intensity that she had never before experienced.

"HHhnnnhaaaa! M-Make it stoooohhhpppp!" She cried out, genuine tears slowly running down her cheeks as the first serpentine shit wasn't the only one, her hole spreading further as a large clump of pure poop plopped out of the hole, further pressing into the adorable striped underwear that the Destroyer wore. In one fell swoop, she had been humiliated on several levels, all culminating in being a putrid potty pants who apparently couldn't wait a moment to try and find a toilet before shitting herself unceremoniously.

Her first humiliation was falling for Crescent and Comet's prank... again. This was hardly the first time they had pulled something like this, only this was the most severe kind they had ever put her through. Her second humiliation was the two watching her toil with her tummy troubles, even if they had some level of sympathy for the effects of the laxative going overboard... And the third, of course, was just plainly using her undies as a toilet when she should know better.

All because she just decided to think they were being genuine when they offered her a plate of fish and chips. What a fool she was.

"Comet, find somebody that can help. I..." Crescent whispered to the green-hared girl, only to pause, lip quivering. "I didn't want it to go this far. Find Illustrious, she had to take care of Javelin before she disappeared, she's probably got an idea of how to deal with emergency messes." The blonde finished, for once putting her pride aside to help the sister that she had ruined in such a spectacular fashion.

Comet could only nod as she sped off. They hoped that she would return soon as the silence hung dry in the air, the two girls being forced to face the reality of what had just happened. And neither of them seemed pleased with the outcome. Of course, Cygnet had a good reason to not enjoy it, but Crescent never wanted it to hit this point.

"Hnn..." The white-haired eldest sister muttered as her tummy finally seemed to calm down just a bit... "Why, Crescent...?" She pointed her question towards the blonde, breathing still heavy as she tried to recover from the sudden expulsion from her back-end.

The blonde was left short of words, the sight of her sister trying to cope with her crap hurting her heart more than she could bear. Thankfully, she didn't have to hurt for long as a chiming chuckle reached both girls' ears. They knew exactly who it belonged to, as there was only one woman on base that could calm most girls' nerves with her voice alone.

"Oh my, I came by as soon as I saw little Comet running. What happened here?" Illustrious, the wonderful woman in white asked aloud as she took gentle steps towards her fellow white-haired girl, who seemed none-too-pleased at the way she was looking at her. It wasn't just a pitying look, it definitely seemed as if the older woman harbored some sort of secret plan for her.

"I... I accidently gave Cygnet a laxative!" Crescent admitted aloud, causing the older woman to raise her eyebrow. "..A-A stupid strong laxative... I-I'm not sure if she can use the potty while it's in her system..."

"Can't use the potty, you say?" A glint shone within the older woman's eyes as she slowly lifted the soilbutt into her arms, carrying her like she would a bride, regardless if the little girl wanted to be carried or even held in such a careful manner. "Well, I'll have to give you a punishment later, little Crescent. For now, I'll have to solve Cygnet's problem. Oh, and make sure to tell Comet that she's in trouble too."

The blonde girl's heart sunk as she muttered something underneath her breath, ashamedly making her way out of the kitchen leaving the Carrier and the Dirty Destroyer all alone. An unnerving position to be in, at least according to the younger of the two.

It certainly didn't then help that the larger woman started carrying her off to a hidden part of the base, a certain place that had only been rumored about. "W-Where are we going exactly, Illustrious...?" The white-haired youngster muttered only to be slightly turned around in the older woman's arms so her face pushed up against the Carrier's ample bosom.

"Sssssh. Don't worry about it. You'll be spending time with me until you recover from your sisters' little prank." Illustrious hushed the smaller girl, only to then be interrupted by Cygnet's poor poopy posterior releasing yet another cute little bout of gas. First a brief little trumpet-like splurt that made the smaller girl's cheeks redden, only to be surpassed by the second expulsion that sounded much more tuba-like in its tone. A herald of another mess to come.

She could feel the poor destroyer's face clenching up as the sound of something releasing from her rear was far too audible. The load in the back of her panties was growing heavier, sagging to the point where you could see most of the logs if you just pulled back the waistband just the tiniest bit. 

The way the older woman tried to comfort her little didn't help much, but it did stop her from protesting as she tried to just wordlessly snuggle her face into that massive mound of soft tit-flesh in front of her, trying to avoid acknowledging the fact that she had just shit herself once more.

Of course, she had to acknowledge her surroundings as the two of them entered the room hidden away from every prying eye in the entire naval base. Illustrious' special little nursery, childproofed and specifically designed in such a fashion that everything a baby would ever need was on display. Plenty of toys, little numnums and even some bottles full of fresh milk for them to drink from. It was an infantile heaven so to speak, one that the Carrier hoped that all of her little babies would come to enjoy. Even if she had to... coerce them to join in the first place.

"What..." Cygnet mouthed as she gave the room a few cursory glances, only for her eyes to zoom in and focus on a certain other baby clad an entirely baby blue onesie. A specific purple-haired destroyer. "...Javelin... So this is where you ended up..."

The onesie clad baby peered right towards the stinky baby within her 'Mommy's arms, before shrugging her shoulders and taking a sip from one of the baby bottles, as if she nonverbally tried to say 'You will get used to it.' Once Cygnet's eyes peeled themselves off the Destroyer-turned-baby though, Javelin pulled out a crayon and started idly doodling on the table she was sitting at, spending the time in a productive if silly manner. Just as Illustrious had taught her.

Just a few moments more and things started to click inside of the younger Destroyer's head. "...Wait, you're not going to dress me up like her, are you? I'm..." She paused, only to blush as she felt something warm between her thighs. Finally, the laxative had taken effect on another part of her system, and at the exact time where it would be most inconvenient.

Illustrious on the other hand could only chuckle as she put a hand on the now-soaked front of Cygnet's thoroughly soiled undies. "Trust me, dear. You'll need it. I know exactly what it's like to go through." She tried to sound supportive as she put the little girl down on a changing table, rubbing her gloved hands together as she pulled the filled undies off the white-haired baby-girl's hips before throwing them into a pail sitting right besides the station.

The smaller destroyer could only blush and try to hide her face as she felt the older woman wash her naughty areas. Up and down, left and right, in and out in all the most intimate of areas, thoroughly to the point where a cute moan left her tiny little lips. It was actually adorable to see her act so hesitant and resistant, but it didn't stop Illustrious from continuing with the preparation for the change. 

Next came the baby powder, and the Carrier made sure that she didn't skimp on it in the slightest. With the way the little girl's bowels would be totally trashed, she needed to wear extra thick diapers for much longer than somebody like Javelin would, and the cloud of powder that was worked up in the process made the white-haired baby cough. A little accident, but if it meant that she wouldn't get a rash, a little bit of inhaled powder probably wouldn't be too bad.

Then of course, came the diapers. Cygnet shivered as she looked at the thick white padding being held up in front of her, not noticing that the diaper was one commonly meant for adults given the thickness and the width. Despite this, she obediently lifted up her legs when the motherly Carrier asked for her to do so. Once the seat of the diaper had been pushed under her bum, then the middle was gracefully weaved through her thighs before the wings were snapped shut, the adult diaper now cradling her waist and ensuring that she wouldn't be making a mess anywhere unintended ever again.

Or at least until her next change.

"This is... the worst..." The Destroyer muttered only to receive a kiss on the cheek by the older woman. "N-No amount of kisses are going to make it better, either! My sisters did this..."

Illustrious on the other hand, could only shake her head in disagreement. "Your sisters didn't intend for you to end up a poopy baby. I'm sure that when you recover, they'll apologize profusely. Like they should." She chimed in a supportive fashion as she added a couple of extra touches, pulling off the diapered Destroyer's other clothes before slipping on a pair of booties and mittens to add on to the girl's already infantile look.

"They'd probably just try to poison me again like they did today..." Poor little Cyggy had completely lost trust in anybody after that stunt, and who could blame her? Who could blame her for being such a grumpy little baby, even as she was being zipped up into an identical onesie as the one that Javelin wore? Well, maybe said Javelin could blame her, but she was too busy doodling to care.

The thought of how upset Cygnet looked tugged at the older woman's heartstrings, even as that upset expression tensed up. Right after having been put into her brand new outfit, the little girl had been forced to soil it like her panties before it. Only, the way her diaper started to bulge outward from the mess was hardly as noticeable on her outfit as it was on her face. The former was keeping itself contained due to the adult size of the padding, while the latter could not look much more upset if she tried.

Until the little girl made another little accident, evident by the massive blush that ran across her cheeks as the front of her onesie slowly grew wetter. Not only had she soiled her brand new diaper, she had also soaked it... which slowly gave the Carrier a bright idea. With her devilish thoughts in mind, the older woman put a hand on that soft and soaked spot on little Cyggy's onesie, before whispering into her ear.

"Tell you what, my little Baby Cygnet... Why don't I take your sisters into this room and show them what happens when you bully your biggest sister to the point of becoming a little baby? I'm sure they'll loooooove to be on the other end of what you're experiencing. Being all Wet and Messy just like you, only they're not going to recover like you are." 

The devilish look on both girls faces, as well as the way the two white-haired ships were giggling and laughing as they plotted didn't sit well with Javelin. She had already been taken advantage of quite easily by Illustrious... and here Cygnet was, giving her a reason to further extend her reach on the cute little Destroyers at the base. Displeased with the course of action about to take place, she muttered one simple line under her breath.

"Here we go again..."