No the long haired one was using that guy as a replacement for nozumu aka noomu
he likes noomu (nozomu) but he was using chihiro (black haired side character) as a substitute. I know this manga has so much content in a really confusing manner, had to read it twice.
not sure how i'm feeling about this. i think that nozomu will end up with his step-bro since he loves him
So it wasn't Noomu???
I thought it was nozuma and the dark haired guy in school
i'm confused, who were the people having sex? who was "noomu"?