You sat on the dorm kitchen table dying all the boys hair because they lost a bet against the girls. They all dyed their hair different colors, even Lida. Now, it was Sero's turn, he was reluctant at first,but he gave in eventually when you sweet talked him into it, but only let you do highlights in his hair, you mixed up some yellow hair dye in a bowl

He was sat on a chair, his head between your thighs, as all the boys watched Sero- No la cagues, mami. (Don't fuck up)