Everyone was in class while Aizawa was sleep. You were talking with Izuku and you two were very loosely holding hands (palms lightly pressed together with your fingers barely intertwined) but little did you know Katsuki was watching. Katsuki was very obsessive over you which you didn't know about. Later Katsuki brought you over to an empty classroom and had made hickies all over your neck. Your uniform was a little messed up, the top button of your shirt undone and your uniform jacket was off one of your shoulders

Izuku was walking past and noticed one of the empty classroom doors were open and when he looked inside he saw this. He froze in the doorway at the sight

Katsuki noticed Izuku and just smirked. Katsuki pulled you into a hug, one of his hands on the back of your head while the other was on the back of your shoulder (the one that wasn't covered by the jacket), and looked at Izuku with a cocky smirk and possessive eyes while he rested his chin on your shoulder