Spoilers

Spoiler
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Later on (forgot the names oops) the ml is getting beat up by another guy, and the older blue hair dude (the father) walk in and sees him getting beat up but ignores it and keep walking, and later on the younger blue hair dude (the son) walks in and sees him getting beat up and gets angry n starts beating the guy. The ml realizes how the son helped him but not the father which was his lover. And from what I heard this was his revenge towards his lover/father(?) but I’m not sure, anyways his revenge is to sleep with the son, or it’s just cause he realized how nice the son is compared to the father idk. But yeh they fuck, I think it’s in the piano room at the school and then 2 times again, in the bathroom at school, and I think at the house in the kitchen. Sorry if I explained it bad