Katsuki had been training from sunrise until sundown every day during winter break.

You and him were the only ones staying in the dorms during winter break as everyone else was with family.

You notice just how much Katsuki is overworking himself when you go to his dorm to give him papers and you see him with burns all over his arms and torso and bags under his eyes as he opens the door and glares at you. “what do you want?”