Be My Hero (Sero x Reader)

!!!!B-DAY SPECIAL!!!!

(FYI: this is going to be fluffy)

"How the actual fuck did this happen again??" Mr. Aizawa asked in disappointment. In front of Mr. Aizawa was two four year old kids. One with raven hair the other with Y/C hair. Both of them were wearing small t-shirts that fit perfectly on them. "Weeeee actually...don't know." Denki sighed and rubbed the back of his neck. "Well they're your responsibility now." Aizawa sighed and rubbed his eyes. "We can't age care of them!!!" Kirishima cried, waving his hands around.

While the 'adults' were talking the two little ones were already being brats. "Can I touch your hair Sero???" Y/N asked, already touching his hair. "Why did you ask me if you're already touching it???" Sero muttered while a small blush crawled onto his face. "Don't know!! Your hair is soft Hanta!!" Y/N chimed and started to mess with it more. "Heeeey stop it!!" Sero whined and tried to push Y/N's hands off. "Nuuuuu!!! I like your hair!!!" Y/N whined and nuzzled their face into Sero's hair. "Heyyy!!!! Stop that Y/N!!!!! You have your own hair!!" Sero exclaimed and finally pushed Y/N's hands off. "But but...my hair isn't as fluffy as yours!!!" Y/N whined and stomped their feet on the ground. "I don't care!!" Sero exclaimed and crossed his arms.

"Just take them both to someone's place." Aizawa sighed and grabbed his sleeping bag. "But what are we going to do about both their clothes??" Mina asked while slamming her hands on Aizawa's desk. "Go buy them some." Aizawa muttered and hid in his sleeping bag. "Oh!! We can go buy them clothes then we can go back to my place!!!" Mina chimed and clapped her hands together. "But I think we should tell their parents what happened." Kirishima added in and crossed his arms. "OOOkay then we'll go tell their parents then to the store then my house??" Mina suggested and looked at the other two. "Yup that sounds good!!" Denki smiled. "Okay let's get the kids!!" Mina chimed and turned around.

When they all turned around they saw Y/N chasing Sero around. Sero was using his quirk, but he wasn't the best at it. Mina, Kirishima and Denki watch as Y/N fails to catch-up with Sero. "We should stop them." Kirishima sighed. "Wait!!! I need a picture !!!" Mina yelled and pulled out her phone. "Why do I have a bad feeling about this." Denki muttered.

After Mina got some pictures they left and went to Sero's house. "What do you think his parents are going to say??" Denki asked while holding Sero. "Hmmm I'm not sure." Kirishima spoke and put Y/N on his shoulders. "Hmmm I just hope they aren't going to be mad at us." Mina sighed while playing peek-a-boo its Sero. "Kiri~kun!!" Y/N chimed and poked Kirishima's head. "Yes Y/N?" Kirishima asked and looked up at them. "I'm hungry!!!" They whined with a little pout. "Yeah me too!!!!" Sero whined as well with a pout. "This is so cute." Mina chimed and pulled out her phone. "This is going to be a fun time." Denki sighed and face palmed.

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"Okay, so who's going to knock on the door??" Kirishima asked and put Y/N down on their feet. "I wanna knock!!" Sero chimed and tried to squirm out of Denki's arms. "Geez child chill." Denki laughed and sat Sero down. Sero ran up to the door and knocked on it. Y/N walked up behind Sero and stood beside him. When Sero's mom opened the door she saw three teens. "Oh hello!! What are yo-" She was cut off by Sero hugging his mom. "MAMA!!!" Sero yelled and nuzzled his head into her legs. "Oh my!!! Umm S-Sero?" She questioned and looked down at the small child. "Umm yeah that's him. We're not sure how this happened but him and Y/N are now 4 year olds. Oh and we were told to watch over them till they're both back to normal." Mina laughed and rubbed the back of her neck. "Oh okay! I was wondering where he was." Sero's mother smiled and picked up her son. "Oh and this Y/N, correct?" She questioned while looking down and the other small child. "Yeah Sunshine!!!" Sero chimed and blushed a little. "Oh so she's the one Sero always takes about." Sero's mother spoke sweetly and smiled down at Y/N. "Ha Sero can't keep his mouth shut about them even with his mom." Denki muttered and laughed. Then Mrs. Sero sat Sero back down on the floor right beside Y/N.