[ABDL, Leaking, Soiling, Wetting, Humiliation, Diaper Use]

"C-Curse you, Shimai..."

A weak voice echoed out as a young white-and-pink-haired fox girl laid inside a crib that was far too big for her. A girl that was currently clutching her stomach as she rolled back and forth trying to stop the pain vibrating around inside her. A girl who wished that she hadn't let her guard down for that single moment, leaving her in this humiliating state...

Her name was Koyoi Tsukimitsu. And she had failed at her most important duty. Protecting the multiverse from any threat that might come to it. And of course she just had to lose to the single most dangerous being in the entire multiverse, one that could ruin the very fabric of the worlds she had been assigned to defend.

Not only that, but that very same woman had decided to punish her appropriately for her defiance. Which was why she was laying in the crib, currently dressed in her ordinary red dress and her sakura-themed coat while something pushed out between her thighs, something thick and dangerously small, especially compared to the incredibly embarrassing garments that her Mother usually forced her to wear.

Losing to that woman had led Koyoi to end up in a diaper that was way too thin for her liking. Not that she liked diapers in the first place, but these were worse at protecting her than the ones she were forced to wear normally. Which meant that any accident would likely cause a leak, and just thinking about that..!

*FRRRRRT*

Koyoi let out a groan as her stomach tossed and turned enough to force some noxious fumes out from between her cheeks. Her diaper crinkled ever briefly, all while she tried to dig her nails into the soft mattress below. This was even worse than normal, because that very same woman that had stuffed her into this diaper had also gone ahead and cursed her. She wouldn't be able to stop her stomach from cramping, nor would she be able to hold anything in. She hadn't spent a long time in this crib, so she hadn't messed herself yet... But she knew it would happen very soon..!

"Oh, Koyoiiiii!"

Koyoi let out a violent groan as her eyes widened, her stomach throwing a fit at the very same time as her bowels decided to react to the sound of the new woman's voice by squeezing out whatever was within them. Resulting in the stinky baby being forced to endure the sensation of something wet, sloppy and filthy pouring out in the back of her thin diaper. Quickly staining the garment with dirty brown colors and putting pressure on the diaper's legholes. Another mess, and she'd start leaking...

"Aunt Shimai..." The poopy fox muttered as she slowly managed to sit up, being careful to not put extra pressure on her butt in the process. All while glaring towards the white-haired fox woman that just came into this sealed room, glaring past her elegant black dress that showed off a little too much skin.

The one that had imprisoned her in this crib, the one that had defeated her and put her back in diapers, and the one that had cursed her to make sure that she'd use those very same diapers... Shimai Tsukimitsu. Her aunt, and the most dangerous member of her family due to the nature of her existence. The one thing she wanted was for every single girl to be just like Koyoi, in the 'unable to keep anything inside their bowels and filling their diapers to the point of humiliating themselves when it leaks' kind of way.

"Aw, you went ahead and messed yourself before I arrived. What a little naughty thing you are, Koyoi!" Shimai giggled, carefully running a single finger through the braid in her hair that reached down to her waist. "But it's okay. The more you use it, the less you'll be able to resist my curse. Which makes you completely useless and unable to stop any of my plans... Not that you had a chance in the first place, since you're such an adorable baby girl who's always needed her diapers, since the moment we first met."

Shimai's words mixed a healthy heaping of sadism together with maternal teasing, and just listening to her for too long was enough to make the cramps inside Koyoi's stomach intensify. Then again, given what her Mother had told her, this was just Shimai's idea of love. Cruelty came naturally to her, and that cruelty was how she showed her love for the other foxy girls in her family...

"You just came here to bully me again, didn't you, Aunt Shimai..?" Koyoi muttered. Despite the fact that she had been responsible for her current predicament, Koyoi was raised to be a good and respectful girl. Which meant that even in a situation like this, she still properly addressed her venomous aunt, despite her full diaper serving as a sign of her twisted love.

Shimai chuckled a bit more, before casually waving her hand a bit. And just like that, another fox went flying through the air. A fox that seemed strangely familiar to Koyoi, thanks to her hair having a very similar shade of hair and fur color as her Mother. Not only that, but the clothes she wore also featured the same kind of colors.

But once the girl landed inside the crib, letting out a pained cry and a whimper, Koyoi took another better look at her. Yes, she definitely did look like her Mother, but the finer details didn't match. Her hair was a few shades darker, leaving her with white and dark-blue hair and a tail that was tipped with that same dark shade. Combine that with her dress sense fitting a guardian like Koyoi herself instead of a caretaker like her Mother, and it really wasn't hard to tell that they weren't the same. But if she was similar to her Mother, and she was dressed more like her, then... Did that mean..?

"Koyoi, I'd like to introduce you to a very special girl. A girl that's been cleaning up after your messes. Not that kind of mess though, you wouldn't catch her dead trying to change one of your diapers." Shimai giggled as she stepped closer to the crib, leaning over the railing and smiling down at both of her adorable Babies. "Come on, Manami. Say hi to your half-sister. I'm sure she's more than happy to finally meet you."

The padded fox's eyes widened. Sure, she had already started to understand who the girl was. But half-sister? How long had Mother kept her identity hidden from her? ...Those were questions that she'd have to get an answer for later down the line, because it was more important to just watch her for now...

Koyoi watched as Manami, who was wearing the same sort of thin and barely protective diaper as her, slowly pull herself up as she looked towards Shimai with a worried and desperate look in her eyes. "S-Shimai, s-stop. W-We shouldn't meet like th-"

Shimai giggled as she snapped her fingers. A tiny wave of energy poured forth from that snap, a wave that Manami couldn't avoid due to her current state. Causing the poor girl to let out a powerful groan as she was struck by one of the lesser curses that Shimai had at her disposal. But even a lesser curse spelled doom for a girl's bowels, and brought eternal torment upon her stomach.

"N-No. N-No no no no!" Manami cried out as she doubled over, falling back onto her knees and then right onto her face as her butt stuck up into the air. *FRRRT*s and *BRAAAAP*s quickly started to echo out from her hole as her stomach forced out so much of the noxious gas inside her. All so that it could push more of the proper filth into her bowels.

Koyoi was forced to watch as her newly revealed half-sister clutched her stomach and cried out in complete and utter desperation. All while she was unable to stop herself from filling her diaper in what felt like an instant. Not only did it take but a second to make that white garment turn a foul shade of brown, but unlike Koyoi's diaper it couldn't handle the extra pressure no matter how much extra space the young fox gave it.

"I-I don't want this! I don't want Koyoi to see! Please! Please make it stop!" Manami cried out in complete and utter desperation as the legholes were unable to keep the filth from staying inside her diaper. Causing it to run down her thighs and gather in a tiny pool underneath her. And the more she cried out to try and stop it, the more her body decided to continue messing with her. Her upset mood was causing her stomach to react accordingly, with more *FRRRT*s being squeezed out of her hole. With more intensity too, the stinky orchestra pumping out brassier and brassier sounds with every little moment that passed.

Shimai giggled as she watched the little Baby make a complete mess of herself. Yes, this was the kind of display that she loved. A girl losing herself in her own messes. A girl who couldn't hold back her nature as a Baby. That was the true nature of any girl, at least as far as she was concerned. Whether that girl was a part of her family, or a girl stuck within one of the worlds she intended to correct...

"That's much better. You're so much cuter like this, Manami. That smell of fresh rain doesn't suit somebody like you. The stinky leaks from your diaper fit you so much better!" The malicious aunt giggled. "After all, that's what you two sisters are. Nothing but stinky Babies. You don't need to be anything else except for stinky, because that's what I love more than anything in the whole world..."

Koyoi grit her teeth a bit as she listened to her aunt mock her half-sister, but she knew that she didn't have a way to fight back against her. Not at the moment. Not when she had taken away her weapons and forced her to accept this curse. So all she could do was just quietly watch her aunt laughing at them and telling them what they were. And she'd have a difficult time trying to argue against it, considering their current abilities.

As Shimai wiped away a few tears that had started to roll down her cheeks thanks to the sheer amount of delight she experienced by seeing this, she took a deep breath and returned to a soft and gentle yet definitely sadistic smile. "Well, I'll leave you two to catch up. I'm sure you have a lot to talk about. I, however, have so much that I need to deal with. Including spreading my influence to Paradoxum…" Shimai giggled as she slowly waved goodbye to the two girls, before leaving with no intent on coming back to free them from their torment.

Once the door to their little prison closed, Koyoi breathed a sigh of relief and looked towards her half-sister, who had collapsed onto her side as the mess within her diaper just kept leaking out. She looked like a complete and utter wreck...

Which was why the best course of action for the young fox was to lay down at her side, ignoring the mess around her, before quietly wrapping her arm around her half-sister and patting her head with the other free hand. "It's okay, Manami... It's okay. We're together now. That's all that matters."

That instant acceptance was enough to break Manami a little further, causing her to turn around and quickly hug the older fox as tightly as she possibly could. Burying her face in her older sister's bosom as another quiet *frrrt* echoed from her cheeks, and a little bit of filth rolled down her thigh yet again.

"That's it, Manami..." Koyoi chimed, a soft smile on her cheeks. "I don't know how long we'll be here for. But until somebody finds us... I'd love to hear more about you. I've... I've always wanted a sister, you know?" She tried to make the best of this foul situation, even as she felt her stomach continuing to throw a fit.

Both sisters grimaced as their respective bowels forced more brassy sounds to release from their holes, and their respective diapers leaking onto the floor below. They couldn't stop themselves from messing, and they'd probably turn the whole mattress underneath them completely brown before they'd get a change...

But as long as they had one another, then... Maybe everything would turn out alright in the end.