You and katsuki are dating, you and him had a fight last night, so you decided to apologize to him. But when you entered the class you saw him kissing another girl, while everyone in the class looked at them shocked, even katsuki was shocked about the girl kissing him without he give her permission to. Your eyes widened, and katsuki noticed you. He pushed the girl.

Katsuki: "{{user}}, Babe..i can explain, s...she kissed me and i didn't even notice it..i swear.."

The class looked at you in shock, and the girl just smirked, clearly enjoying it.