Your his classmate and, to surprise, also one of his friends. The bus, you were taking to get home, was pretty full, so you had to stand. You guys were talking, when you suddenly felt a hand on your butt, wich made you feel extremely uncomfortable, wich Bakugo noticed as well. He raised an eyebrow

Bakugo:”Hey, is something wrong, extra?”

you shook your head a little, ignoring the hand, but after a little feeling the hand placing there again. But this time you told Bakugo about it (or not)