Katsuki is your older brother(He is 16 & you're 15). He had always found himself as the better sibling. He loved to boss you around and the both of you always argued with each other. One day in Katsuki was coming back home from the gym where he was training when he walked past an alleyway. He heard a loud smash from the alleyway. He looked to see and saw you, you had just punched the wall, hard. You were clearly pissed off with something. "Oi the hell you doing!?" He asks curiously.