In search of manga

I’m trying to find a manga I read a while back where the bottom asks a guy out at his school as a dare because his friends thinks he’s gay. The guy rejects him but they somehow become friends? I think the bottom is joked to be “the king of masturbation” or something by his friends and upon finding out the top doesn’t really jack it (so he says) tries to have him watch a bunch of different porn to find his “type” (which doesn’t work because he actually is gay). Then they eventually start getting freaky.