Chapter Text
“Oi, shitty hair, you good?”
“Yea, I think so,” Kirishima gripped the hand Bakugou held out to him and got to his feet.
“You sure? The one in the back touched you, right?” Bakugou was scowling, but Kirishima’s heart warmed at the thought of Bakugou worrying over him.
He smiled, “Yea, bro. I don’t feel anything, she must not have activated her quirk.”
“Good,” Bakugou turned back to where the two villains were gingerly getting up from Bakugou’s last detonation, “Let’s fucking finish this.” Kirishima met his feral grin with a smirk of his own before banging his fists together and turning to the villains.
~~~
Bakugou woke up mad, and it only took him a few seconds to figure out why. An earsplitting wail permeated the air, coming from the room directly next to him. What the hell was Kirishima watching? It sound like a baby crying and it was getting on Bakugou’s last fucking nerve. God fucking damn it, he was so warm and comfortable. He didn’t even want to roll over. But this noise. It grated on his nerves and made his skin crawl. It had to stop or else… it just had to fucking stop. Flopping over to face the wall, he knocked roughly, “Kirishima! Turn it the fuck down!”
The crying continued. He pounded the wall so hard the shelf above his bed shuddered, almost sending his All Might figurine toppling onto his head. The wailing got louder . Bakugou’s hands sparked, comfortable or not he needed to do something before he lost his fucking mind. Ripping the covers off of him, he stomped to the door and threw it open so hard it ricocheted off the wall and hit him as he tried to walk through. A string of curses fell from his lips as he took the five steps over to Kirishima’s room to bang on his door. Still no response. He twisted the handle and wrenched it open, ready as all get out to spew profanities until morning so that Kirishima knew just how done he was with the racket. But, the words died at his lips. Kirishima wasn’t watching anything. Bakugou couldn’t even find the Kirishima he knew in the room. What he found filled him with such an indescribable shock and apprehension that he almost forgot that he could still hear crying. Because staring back at him with swollen crimson eyes, wrapped up in a mound of blankets that seemed to swallow him whole, was a two year old that looked for all the world like a younger Kirishima.
“What the fuck?!”
~~~
Bakugou was at a loss for the first time in his life. It was obvious to him what exactly had happened. It had clicked as Mini-Kirishima had reached stubby arms out to him, crying a broken “Ba-gou”, that the villain that touched Kirishima in battle was the cause of this. But, he was Katsuki Bakugou, God damnit! He was rough around the edges, explosive and rude, and he knew nothing of how to take care of a child. Every child ran from him on sight, and he was an only child with parents who decided they could never handle another after what he turned out to be. He had finally had enough sense to step into the room and tentatively take the crying Kirishima in his arms, supporting his weight the best he could. Bakugou had no idea how he would calm the child down, but luckily it seemed that Kirishima was satisfied with his presence alone as he curled into him. Bakugou cringed at the snot and tears that left a trail on his neck. He needed to get to Recovery Girl. He could not figure out what to do and it was starting to unnerve him. Bakugou Katsuki was never unsure. So, completely forgetting that it was 5:30 on a Friday morning, he marched off to the nurse’s office, a sniffling, teary child resting against his shoulder.
~~~
By some miracle, Recovery Girl was actually in the nurse’s office. She seemed to be searching for something when Bakugou barged in, but that was quickly forgotten as Bakugou plopped Baby Kirishima on the bed next to where she was crouching.
“Kirishima got hit by a quirk yesterday while we were patrolling. It didn’t do anything right away, so we didn’t know. I just awoke to him like this.” Bakugou had absolutely no idea how he managed to speak so calmly when his hands were shaking.
“Oh dear, this is a problem. Call Aizawa, his number is in the binder on my desk.” Recovery Girl began her examination, making small noises and “huh”s as Bakugou did as she asked, convincing his grumpy teacher to come even though he claimed he was “too tired” and that “You kids should learn to deal with your own problems.” It was definitely his very convincing argument and not the rare worry that leaked into his words that convinced Aizawa to make an appearance. Nope, Bakugou had a convincing argument. Yup. That’s it.
A few minutes later Aizawa, Bakugou and Recovery Girl were gathered around the computer in the nurse room as Recovery Girl plugged in the data for her newest patient.
“The woman’s quirk seems to just make the body go back in time, not the mind. From what I can tell, mini-Kirishima still has all the knowledge of older-Kirishima, he just doesn’t have a brain mature enough to process it,” Recovery Girl explained. “I would guess that the quirk will last about 7-10 days because it took a bit for it to take effect. I don’t know how this will affect his ability to use his quirk, and would like to keep him around UA in case something unexpected were to happen.”
“He’ll stay on campus then. It is best to involve as few people as possible,” Mr. Aizawa stated.
“He’s gonna fucking stay here? How?! News flash, we don’t have a goddamn daycare! Who’s gonna take care of…” Bakugou’s words trailed off at the knowing looks that the two heroes were giving him. “No. No no no no, hell no. You think I can take care of a fucking baby?”
“Hate to say this, but the kid is attached to you,” Aizawa looked pointedly at where Mini-Kirishima was sitting on the bed. The kid was staring at Bakugou, and the second he made eye contact his eyes lit up. He reached grabby-hands towards Bakugou, but no. Bakugou wouldn’t give in. He’s too rough. Too volatile. There’s no way he could take care of a fucking baby. Even a cute one. A cute one that was now starting to tear up… fuck him! Fuck Kirishima and his cursed puppy eyes that somehow got even worse when he de-aged! Fuck the fact that before Bakugou could even get well and truly pissed off Kirishima’s lip began to quiver, and his face was so downtrodden that Bakugou swept the child into one arm and held him against his side. Fuck this!
“You really think I can take care of a- Oi watch it!” Bakugou reached up to detangle Mini-Kirishima’s hands from his hair, “Of a child?”
“Honestly, I would be surprised if this doesn’t end in disaster-”
“Oh, hush,” Recovery Girl stepped in, “He’s doing fine now. It never hurts to try.”
And that’s how Bakugou ended up with a free(read: forced) parenting trial at the ripe, wonderful age of 16.