Onimai: Full Regression! (Private w/CrinkleButtZo)

[Shirayuki]

It was bright, sunny morning weekend over Japan. People were out and about, admiring the pristine weather, going out with their friends. The Oyama household was no different - save, of course, for a certain boy that had been cooped up in the house for years. Mahiro had been a shut in for a very long time, leaving her sister to deal with household ordeals and the like.

Oyama Mihari, however, was looking to change that little fact. Being the rather genius girl she was, she had devised a plan to get him back into society, and today was the first day everything was put into place... as the young man slowly stirred from his sleep.

[CrinkleButtZo]

Mahiro yawned as she sat up and turned off her alarm. "That's weird," she thought, noticing how much larger her bedside table seemed. But the home security officer had business to attend to.

Letting out another yawn, she glanced at her phone and grabbed it. "Did I catch a cold?" she wondered, turning on the camera. She screamed when she saw her reflection, pulling at and slapping her cheeks to make sure she wasn’t dreaming.

[Shirayuki]

The door to the room suddenly opened, the eyes of her black-haired sister peering through the gap along with the light. She bore a small grin on her face as she saw the newly 'born' girl and walked in, staring down at her own creation "Ah, good morning, big brother, or do I say baby sister now, Mahiro?" Mihari laughed as she jotted something down on the notepad - the transformation wasn't exactly tried and tested yet as she inspected her.

[CrinkleButtZo]

“Mihari, what’s going on?” the now very small girl asked as she approached her much bigger sister. “What are you writing? Do you know something about this?” She tried to sound serious but came off as a toddler just waking up.

[Shirayuki]

"Hmm, very interesting... you seemed to have retained all your memories and mind..." She muttered as she lifted him - or now rather, her - up from the ground, seeing what he had become "And everything else is around that of a toddler, seems like everything is going according to plan!" Mihari smiled as she looked at him "Ah, I think we need some clothes for you then, those are definitely not fitting on you anymore."

[CrinkleButtZo]

“Retained my—” Before she could finish, Mahiro found herself lifted into the air. “Hey, put me down! You can’t just manhandle me like this!” Mahiro whined, kicking and squirming. “Mihari, did you have something to do with this? You can’t use me as some kind of guinea pig!” Mahiro said, trying her best to scold her sister.

As she continued squirming, she noticed she hadn’t paid much attention to her clothing and realized her favorite shirt now resembled a dress. “Besides, what would Mom say if she knew you were using me like this?” she continued, unaware that she was starting to pee.

[Shirayuki]

"Ah, I don't think she would mind, especially with what I have planned for you..." Her voice trailed off as she quickly saw the streams of urine work their way down, rather alarmed - she anticipated that she might have some issues, but Mahiro didn't even seem to realize it one bit "Hey, you're peeing yourself!" Mihari quickly set him down back onto the floor.

[CrinkleButtZo]

Feeling her blood run cold, Mahiro glared at her sister. “What do you mean, ‘what you have planned’?” she demanded before being put down again. She froze, realizing not only had she woken up much smaller than when she went to sleep, but her own sister was behind this.

Shocked, she looked down to confirm and noticed she had started to wet herself, something she hadn’t done since she was very young. Looking down at her favorite shirt, she saw fresh wet spots and a small puddle forming underneath her. When she looked back up at Mihari, tears began to well in her eyes. “Why, Mihari?” she asked, her voice more whiny than she intended.

[Shirayuki]

"Why?" Mihari looked back at her brother with a small, smug grin "Because I'm getting you out of that stupid room of yours! And in this way... I think there's lots of things I'll be able to teach you." She said as she quickly lifted her up into her hands after Mahiro was finished with her "buisness", making sure to avoid the wet spots (She'll deal with the wet floors later) as she quickly swooped her into the bathroom.

[CrinkleButtZo]

Mahiro pouted as Mihari effortlessly lifted her up again. “What could you teach me? I’m your older brother!” she said confidently. “And if not for me being in my room, who knows what kinds of disasters could happen? It’s my job as the home security officer to—wait, where are you taking me?” She noticed they were leaving her bedroom.

Feeling a twinge of panic, she began to squirm. “Mihari, I mean it! You need to fix this!” Taking note that they had entered the bathroom Mahiro confused her battle to escape her sisters grasp. Surely this had to be come kind of nightmare.