[ABDL, Pantypooping, Soiling, Diaper Use]

"There we go, that should be all of them. Holding up well, Kaya?"

"Y-Yeah! T-Totally."

"It's okay if you admit that you're having trouble, Kaya. You know I won't tease you about it."

The sight of two young girls decked out in armor would be a strange sight to be sure, but given the two monsters that kept them company, it was clear to anybody that saw them that they were more than just girls. They were Riders. And judging by their tanned complexion, it wasn't impossible to assume that they had grown up together. Even if their taste in armor was a bit different.

The louder and more energetic of the two girls was named Kayna. One of the best Riders from Mahana Village, her and her trusty partner were able to protect the Village from anything that dared to try and bring it harm. And whenever she didn't have to protect it, she was more than happy to help the Village out in other ways by hunting down monsters that had the materials that the Village needed to flourish. All while baring more than enough skin, not just due to the tropical climate that she was used to but because she felt empowered by fighting with this much skin exposed.

Her companion and fellow Rider was a younger girl by the name of Kaya. She belonged to Mahana Village as well, but circumstances forced her to leave the Village and explore on her own. By the time that she returned, she had matured enough to stand side by side with the blonde Rider she looked up to. Though unlike Kayna, the blue-haired Rider preferred to wear much more protective armor, having gone for the soft and completely covering Mizutsune armor, giving her an adorable hood that wasn't exactly helping her whenever they went out hunting in the warmer climates.

What had they been doing today? Simple, just getting in a bit of practice by finishing a couple of Quests that the Village had to offer. Even though Kaya had more than enough experience as a Rider thanks to her journey, that didn't mean she got to slack off. She still had to put in plenty of work to earn her status as a Rider. She was willing to do that for sure, but the pain that came with being focused out of desperation by the Monsters that they fought... It was something she'd never get used to.

"I... I'm fine, Kayna..." Kaya muttered with a bit of a blush on her cheeks. Not just because she felt a bit embarrassed by how Kayna still treated her like a kid sister, considering how long the two had been inseparable, but because she really didn't want to admit to her that she wasn't feeling great. Between being hyper-focused by all the Monsters, and the fact that she had to down so many Mega Potions to keep her and her Monstie nice and healthy... It had done a number on her body.

Kayna patted her proverbial little sister on the head. "Just remember to tell me if you need help. Alright? We're like sisters after all, Kaya." She chimed and stretched slightly. "Now, how about we get home and turn in that Quest? See the bright smiles on everyone's faces when we tell them that we've dealt with their Monster problem!"

Kaya nodded as she walked towards her own Monstie, planning to mount it and enjoy the ride back. Surely that feeling in the pits of her stomach wasn't anything bad. It wasn't going to bother her... W-Was it?

Unfortunately for Kaya, the second she tried to climb onto her Monstie Partner, the tamed Mizutsune that had helped her so much... She heard the faint sound of something squeezing its way out of her cheeks. The teeniest gust of dirty wind making a quiet *frrrt* sound. And the color on her face quickly started to drain...

"Hm? Kaya? Anything wrong?" Kayna asked from atop of her Velocidrome Monstie, raising her eyebrow as she noticed that the younger Rider hadn't gotten on hers. Something seemed off. It didn't take a genius to realize that.

Kaya trembled as a few tears slowly started to pour down her face. No, this wasn't happening. She wasn't about to have an accident. She knew that it couldn't be... Th-There was no way. S-She was just going to get on her Mizu, then... t-then...

*FRRRRRRT*

Her cheeks blushed even brighter red as the dirty gas from the depths of her bowels made a swift exit, the brassy sound making it all too obvious that something bad was happening. To the point where Kayna had already dismounted her Monstie, running towards her little sister figure to try and comfort her before it all came crashing down...

But she was too late. Kaya's cheeks let out one more *FRRRT* before the filth poured straight out of her poor hole, both cheeks parting as the liquid slop of pure filth filled the back of her panties. Slowly but surely making that tender fabric sink further and further towards the ground. It wasn't weighed down that badly, but it was definitely doing its best to sink. Both because of how the panties soaked up the messy liquids, but also because of the weight of the slimy chunks that were being mushed up against the poor girl's rear.

It wasn't just a poopy mess that she was being subjected to. No, she was also making a mess in the front. Drinking that many Potions in a row, especially the extremely potent and large Mega Potions, meant that her bladder was filled to the point of bursting. And by having her bowels forcibly release what they had been storing, the bladder was more than happy to follow along, with a thick stream of pee pouring out and staining away at her panties, letting all of that yellowing liquid get soaked into the underwear... Most of it, anyway. The rest quietly poured down her thighs and into the tiny puddle forming at her feet.

To say that Kaya was shocked at what just happened to her would be an understatement. Tears were running down her cheeks. S-She was a big girl, she had done so much as a Rider... To poop her panties like this was too much for her. She wanted nothing more than to curl up into a ball at this point. She just wanted to disappear. But there was no way that she could do that. Because Kayna had seen her. Kayna, the girl that had watched over her and protected her and acted like an older sister... She was the last person she would want to see this...

"Ssssh..." And yet, Kayna didn't blame her for it. The older blonde wrapped her arms around the young blue-haired Rider, pulling her into her bosom as she carefully ran her hand through her hair, pulling the girl's hood down for just a few moments so she couldn't hide herself away. Not while she was there for her. "It's okay. We'll get you back to my house, I'll check the Quest out, and we'll figure something out. Okay?" She said, trying her best to alleviate her worries...

Kaya slowly nodded into the bosom of her partner and older sister figure, still quietly sobbing. Anything to get her out of this predicament... Anything to wipe this shame away. And though she felt nothing but humiliation from the fact that Kayna had seen her make a mess... At least she didn't tease her about it.

She just hoped that her armor would hide most of the mess, while she headed back to the village. And that nobody would notice the smell...

---

Thankfully, the trip back to the Village wasn't an issue. And Kaya's Monstie, the one that could've brought attention to the mess the most, remained quiet as it returned to its stall, all while Kayna also did everything she needed to do. Kaya was free to just wait inside the older girl's house until she returned...

There was something beyond humiliating about the fact that she was at Kayna's mercy. But at the same time, who else could she turn to? Who would treat her with respect after knowing she made a mess of her panties like an overgrown child? She wanted to be seen as a proper Rider, not a girl who couldn't keep control over her body. She just had to accept this little mishap for what it was, and then... Hopefully nothing would go wrong again.

By the time that Kayna returned, Kaya felt a mixed sense of relief and shame at her presence. But she didn't do anything to struggle against what came next, having laid down on the bed before hand and furled her skirt up so that the older Rider could get to her panties.

Kayna smiled at the sight of her little sister figure already being ready for her. "Let me tell you, Kaya, it's really hard to get the right supplies without telling people what you're dealing with." She chimed, sighing in relief as she saw the girl tense up a bit. "Relax. They don't know. Only you and I know that you had an accident. Now, let's get this thing off you, get you cleaned up, and then we'll talk about what we'll do from now on."

Kaya slowly nodded, trembling and blushing even more as the dirty panties were removed from her bottom. If there was one thing that was more embarrassing than making a mess and pooping her panties in front of Kayna... It was showing that very same girl her privates. Sure, they were close... B-But that didn't mean she wanted her to see that hole down there...

Thankfully, Kayna noticed the way that her partner trembled. And she smiled as softly as she could while carefully wiping away all the dirty stuff that had been covering the poor girl's nethers. Whether it was the still-sticky pee that covered her thighs, or the dirty and runny mess that was still stuck in between her cheeks. She also wiped the young girl's most precious place clean, and wiped her cheeks clean of any little bits of dried poopy to make sure that she wouldn't stay dirty.

"There we go. You're all clean now, Kaya." Kayna said as she tossed the dirty wipes into the trash, before reaching underneath the bed that the girl was resting atop of. "Now... Let's just make sure that you don't end up making a mess like that again, alright?" She chimed as kindly as she could, before she held up something that the younger girl was intimately familiar with.

Diapers. Absorbent diapers made from Ludroth materials, designed to be able to soak up any kind of waste that would pour out of a poor baby's bottom. But she wasn't a baby. Kaya was definitely a big girl. But at the same time, she had an accident. So these were perfect for her, weren't they..?

"Kayna, I..." Kaya tried to argue against this, but the older Rider just put her finger on her lips to make her keep quiet, all while the bottom of that soft diaper rested against her bottom. She then weaved the material through her thighs and snapped the wings shut. It was going to keep nice and snug around the young girl's bottom, while at the same time preventing any great accident.

"There. Now you won't have the same kind of accident." Kayna chimed, grinning a bit. "Don't worry, your Big Sister's got plenty of those where that came from. I had to do something with all the Ludroth materials we gathered, after all."

That didn't sound right. Why would Kayna want to make diapers when she didn't need them?

Kaya didn't get the chance to dwell on it for long before her face flushed bright red and tears poured down once again, as the sound of her bowels having another fit erupted from her cheeks. The loud *FRRRT* echoed through the house as Kaya’s diaper expanded due to the mess soaking into the puffy diaper, both the front and in the back growing in equal measure thanks to the little girl pooping and peeing at the same time.

The little girl sobbed yet again as she became intimately aware of just how badly her bowels and bladder had been ruined by everything she did, and quietly accepted a hug from her Big Sister. A hug that would soothe her nerves and slowly but surely let her accept her fate. Because Kayna wanted nothing else except to see her happy...

She'd have to grow used to these diapers, if she wanted to try and recover.