What I remember that the boy always fooling around but the seme didn't get angry. After, the boy slept with seme's girlfriend, the seme found out and rape him. But, actually he didn't care about the girlfriend because he actually kinda planned this might happened so he get the chance to rape him. Anyone? Remember this one? ╥﹏╥ Btw, both of them are delinquent if I'm not mistaken.
What I learned from this story is don't read until late night, or you'll end up dreaming about having a yandere boyfriend who is a stalker...