Katsuki's Baby Sister

{Special} Small Katsu

First off, HAPPY BIRTHDAY KATSUKI!!!

You're gonna hate me after this, but I still wuv you onii-chan!

Shiyoko: Me too! Hehe he

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Third pov

"Hide me!!" Shiyoko yelled as she ran behind Katsuki.

"Hah!? What did you do!?" He glanced down at her.

"Nothing, that support girl is crazy!" Shiyoko stared up at him wide eyed as she gripped tightly onto his pants leg.

"What support girl-"

"Mini Bakugou! Please! My baby isn't dangerous!!" Hatsume Mei barged into the classroom holding up a fire extinguisher?

"Oh...her.." Katsuki sighed.

"Ah, Bakugou! Have you seen your sister!? I have this baby that will totally help with her quirk!" Hatsume yelled upon seeing the older Bakugou and placing the support item on his desk for him to see, even though he didn't want to.

"How the fuck does a fire extinguisher help?" He raised an eyebrow.

"Oh that's the best part! It's not a fire extinguisher! My baby sprays out water that freezes immediately! And all you have to do is-oh!" Instead of showing Katsuki the button to press Hatsume pressed it, spraying the Bakugou siblings and sending Katsuki off his chair.

"You bitch! I'm going to fucking kill you!!" Katsuki yelled as the two were coughing through the smoke that was actually supposed to be water.

"Huh... that was supposed to be water... guess I still have some ways to go!" Mei laughed as she skipped out of the classroom taking her baby with her.

"Hey, Aoimoku, you good?" Katsuki asked in a rather strange voice.

"Yeah, I'm fine. You?" She asked also sounding strange. The smoke cleared up and the two met eyes.

Nothing registered in their minds for a minute before both of them let out very loud screams. Those in the class looked towards the two shock overcoming them as well.

"What-! What-!" Shiyoko didn't know what to say.

"WHAT THE FUCK IS THISSS!!??" But Katsuki did.

"Ohh! No way! I called it! She was gonna be a beauty when she got older!" Mineta drooled from behind Shiyoko.

"FUCK OFF GRAPE JUICE!!" Katsuki yelled jumping up to run and hit him.

"Katsuki no!" Water rushed from Shiyoko covering them both in her hair. "You're naked, Bakuchiku!" She scolded placing her now small clothes on him.

"Um...what is happening?" Izuku, Iida, Ochako and Shoto stood by the door confused.

"Nii-chan! Please help!" Shiyoko's voice begged "Can you get Aizawa sensei?" She asked. Confused they walked into the classroom and Shiyoko let the dome down a bit to look up at them.

"HUHHH!!!??" Iida Ochako and especially Izuku screamed in shock. Before them was a toddler version of Katsuki and a teenage version of Shiyoko.

"FUCK OFF SHITTY EXTRAS!!"

°^° °^° °^°

"A week!?" The Bakugou siblings screamed at recovery girl.

"Sorry dears, looks like you'll both be like this for a week, at the least. You still have your memories and everything but your quirks are affected." Recovery girl told them.