But there is a reason seme is like that. He was repeatedly raped by his own stepfather as a child, and uke is a big brother who has impure sexual thoughts about his own little brother. As a victim of incest-rape Seme is understandably extremely prejudiced against the uke who he thinks is just like his own father.
Of course, in course of the story, he realises that although uke has feelings about his younger brother, he never made a move on his brother, so he grows to like and treasure him.
I know what the seme did for the uke,blackmailing him and rape when they first met is cruel but i think it's still good that he did not end up with his brother. The seme is still a trash at the beginning.