I don't think the friend had that sort of idea if he is threatening him now. More like the friend forced him into all of that (without any sort of affection) and then the guy got revenge. To me that guy had no right to ask for compensation. He took the guy's virginity and blackmailed him; such a risk obviously had to have consequences. There couldn't have been any affection from the 'friend' for him to call several times asking for 'compensation' that he doesn't deserve. And then the guy did the same thing with the MC but unlike the 'friend', since the beginning he felt guilty about all of it and the MC ended up developing feelings for the guy.
Yeah, I don't approve of what he did but at least he felt guilty about it. It shows he has a humanity that the other lacks. To this day, he thinks he did nothing wrong.
um I just notice something His friend that kept calling him was doing the same thing that was done to that kid meaning they go on date's and have sex and all. that friend must be in love with him that's why he blackmail him from the beginning. too bad though he only saw it as a cruel thing and plotted revenge if only he was like that kid and fall in love maybe they are lovers now... too bad but nice story though...