well it was more like that what the uke tell him was true that: "if you keep doing this to many others you're going to jail"
i don't think so, he was really affected by the fact his brother left him so he was looking for someone that would stay no matter how violent he was
--^^This. He LOVED his little brother beyond...so far beyond. ..the healthy realm of sibling love, respect and decency. The parents left him to his own devices, basically raised himself and he didn't really see the little brother as a brother. Highly recommend reading the little brothers story beforehand.
I think the reason why I don't hate this seme more than his brother's lover is because both of them were major douche bags in their special way, but at least this seme did not sleep or abuse anyone else since the first time they did it. As ironic as it seems, he was looking for a committed abusive relationship.