"She's my sister, idiot!" || A Kirishima x Reader Story

Turns out Katsuki Bakugou has a little sister. (Y/n) Bakugou. Nobody outside her family knows about the fact except Izuku Midoriya. For her own reasons, (Y/n) decides to go by the name of (Y/n) (L/n) instead. She attends Class 1-A with Katsuki and befriends Mina Ashido, who introduces her to the Baku-Squad, and she ca...