(It's kinda old and cringe but I'm too lazy to change it so.... Yeah)

you and Katsuki were rivals. You had been since you had both joined the U.A., as both of you had the same objective: become number one hero. You would often annoy or 'bully' each other, that if you didn't actually fight, which you often did. You'd throw a kick, and he'd dodge it. He'd throw an explosion, and youd dodge it as well. It was almost like a routine, y'know? You two would always compete to see which of you was the strongest.

One day, you were putting your things away while talking to your friends as classes were finished for the day, when you feel someone behind you. You didn't even need to turn around to figure it was Katsuki