it WOULD be nice: if this was a story from Gabriel's POV. but we're watching from the pervert Manabu's perspective right? He's not even sure what he feels for Gabriel aside from carnal attraction so it'd kind of just be a pathetic end to the story considering he would probably only realize he liked Gabriel after Gabriel hooks up with someone else. The only thing that could be WORSE is if Manabu & Gabriel actually ended up together after that instead of whoever actually took the time to win Gabriel over!
I'm not saying we should root for Manabu or any of that crap (personally i think he's nothing but a weird pervert--he didn't want his roommate to find put he's into muscular guys but barely put any effort into hiding his muscle-man porn stash) but this is kind of just one of those stories where the main pair gets together only after they've had sex. it's not gonna be super romantic. there's a good chance they're gonna fuck in the next chapter. that's just how things are going (￣∇￣")
Imagine this another guy comes their class and he becomes friends with Gabriel, the plus side to him is he asks for Consent and manabu gets jealous (づ￣ ³￣)づ