Cheer Up Momo

Reward for TFLoving, an addition to the Spell Saga Set, starring Momo from Boku no Hero Academia
 

There is a story written by TFLoving that goes with this pic, which you can read here:
 

Ochako and Momo knew how important today was, and they had felt so ready  for it. They had just finished the obstacle race, neither girl feeling  that they had done well enough.
For Momo, she couldn’t help but wonder what she could have done to do  better in the race. Surely she could have created some kind of wing suit  and glided over the minefield faster? Or perhaps she could have tried  to slow down the others by placing her own little traps. Maybe some  marbles. She could have thrown them ahead and possibly tripped one of  the heroes who had beaten her. Being the perfectionist she was, she  couldn’t help but continue to ruminate on what could have been done.
 

“I wish i could do it over…” she muttered to herself, looking over at the boys who had taken the top places.
 

Nearby, in amongst the crowds of spectators, a woman smirked, her face  hidden under a hat. She had a very special quirk, and seeing as she  happened to see Momo’s muttering. She was a professional lip reader  aside from her quirk, and she thought she might as well help out the  girl. She muttered some words under her breath and then continued to  watch the show.
Momo’s attention was quickly demanded however as she found out she was  now responsible for making all the cheerleading outfits for the girls of  class A. She found it all a bit odd, but soon enough the girls were all  dressed in perfectly fitting matching uniforms. Upon finding out that  the ‘rules’ for their uniforms had been made up by the class perv in  order to get them all in cheerleading outfits, she was both disappointed  and frustrated.
 

She kicked at a stone, an uncharacteristically childish thing of her to  do. She didn’t know why, but she was really taking everything badly  today. Why couldn’t SHE have been the winner. Even her quirk of creating  things seemed to be going wrong today. She’d made her cheerleading  outfit too loose, she could feel the skirt beginning to loosen and she  frowned. Everything had fit perfectly before!
It began to slide more and Momo was forced to grab the waist of her  skirt and hold on to prevent it from sliding down her legs. Why weren’t  her hips holding the skirt in place any more? Surely she couldn’t have  made the uniform THAT big. And when did the other girls get so tall? And  why did she feel like a weight had been lifted from her chest?
 

The woman in the crowd couldn’t help but chuckle as she saw the effects of her quirk beginning to speed up.
 

Momo’s eyes began to fill with tears as she suddenly saw that it wasn’t  just her imagination, she was shrinking! Who could be doing this? Why  was she so much smaller?… or was she younger?
Looking down, Momo couldn’t not notice that her ample chest and hips  were now non existent, or that her hair was no longer as long as it had  been moments before. What was happening?
She had to find a teacher to tell them what was happening, could it be  her quirk was malfunctioning? Was someone else doing this to her? She  quickly turned around, looking for any of her teachers to get help.  Unfortunately for her, the now much smaller girl was not yet used to her  changed body and so even as she turned, she continued to shrink,  falling backwards on her rear with a heavy thud. Or at least she would  have, if it had not been for some kind of soft padding that she had  landed on.
 

Sitting, legs splayed, Momo’s first realisation was that her legs looked  a little chubby, almost like a toddlers? The second realisation was  that she couldn’t close her legs because of whatever padding had saved  her fall. Looking down, she was greeted by the sight of something she  hadn’t seen in a long long time…
A thick pink diaper poked out from under her cheerleading outfit, which  had somehow now reformed to fit her. How was this even possible? Before  she could react to this new change however, Ochako came rushing up,  looking super excited.
 

“Aww! Momo didn’t say she had a baby sister!!” The student now towered  over Momo, looking down at her in awe of the cuteness. “Do you wanna  come cheer with us?”
 

Momo was confused, but, somehow that feeling was fading away. She had  just been asked by a big girl if she wanted to come play with them. That  was every little kids dream! Of course she wanted to go play with them!  With a quick nod, she was soon holding Ochako’s hand and toddling as  fast as possible to keep up as she was taken over to the other  cheerleaders she had been separated from earlier.
Soon she was eagerly jumping around and cheering with the rest of them.  The bigger girls didn’t mind at all that she was rather clumsy and way  too young to learn to do the moves properly, they were just happy to see  Momo’s little sister so happily playing with them.
 

Speaking of which…. where was Momo?

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You can read the continuation to this story here