You had gotten bored during class and sat right behind Katsuki. So you decided to mess with him

You leaned over your desk making sure your teacher Aizawa wasn't looking and you tapped bakugou's shoulder with your pen

He ignored you, So you kept doing it until eventually he looked Pissed then he gave you a note. It was obvious it was a note that was gonna tell you to stop

When you opened the note of course it said 'Stop bothering me, Extra'