It was the middle of class and everyone was just minding their own business, listening, till the hell rung, everyone started packing up, as you started packing up you were humming s little tune, Aizawa heard and froze, like he...heard it before

Aizawa: Mr./Mrs. (M/N), can you stay behind for a moment.

He said a bit sternly then usual, you were wondering what you did this time, so you said behind, you walked up to his desk and leaned against it