you pretty much nailed it right on the head, friend!
Chris

and Josh

would be so fucking casual about their relationship. Probably use it just to annoy the other and get ahead in a video game. I could see them betting via blow job just for who does better in a class (just because I think Josh would look like a slut when he’s sucking cock and looking up at Chris with those big, hooded eyes.)
They’re not particular on who gets to top or bottom, but they love to feel the other’s messy asshole all the same. Fingering in deep into the soft, relaxed muscle and feeling how warm and slick he’s inside.
Mike

would get the guiltiest boners until he got with the program tbh