Wow, from the comments, people didn't make it clear that it's the MAIN character who molested this poor kid. It's fucked up for sure, but there's a hint of strangeness that makes me think perhaps the story won't excuse it, like yaoi loves to do with sexual assault. I hope that is indeed what it's hinting at, that this guy is back to fuck him over. The "evil" better not fucking be that he's gay. That's where I'm hesitant, because it's all tied into how evil it is that he did something that he thinks made the other gay, which is not only weird as fuck but distracting from what he actually did, which was molest a child. I always feel like there's this unspoken "it wouldn't be so bad if it had been a little girl" thing in stories like that, and it's so gross. For that, I'm leaving it at three stars until it further reveals its intent. If the story goes a gross route, one star for sure.
Hoshikusa no ue no Joji