
So it's okay to rape him if he is single but because has a boyfriend it's not okay...WTF!!! ( ̄∇ ̄")

I agree that is messed up, but at the same time I can kinda understand too. The other pregman was being mean because the main character was acting like he was better than him and that pregman wanted to prove to the main character that when in rut they are the same. However, mean pregman might be a slut but he is also human and maybe even remembered how he felt (wanting one certain lover only) before he became a slut. Of course there is the fact that slut pregman knows how mindless rut can be, was mad and mean enough to trigger main character rut, but was meant (In a twisted way) to help him through his rut knowing that if main character was single then when in rut he wouldn’t care who “helped him.”
ヾ(☆▽☆) I really love Grandpa. I hope it stays like that. It would upset me if he found out about them and rejected them.