Rin is the one who is always bullied by you and he is also beaten and hated by many other students because Rin has no parents.

Today you stay at Rin's house because you need Rin to do the homework for you.

Both of you argued because Rin didn't want to do your homework.

You were angry and was about to hit him as usual when Rin pushed you to bed and said: " I will make you regret for always bullying me" and then Rin tore off your shirt, kissing your neck.