So I'm thinking my guy is either a high school senior or college freshman/sophomore and he's either got a hardcore rival or close friend that he's known since they were kids. The other guy has a really cute boyfriend and a playful little bet was made between him and the boyfriend that if he could score better than his rival/friend in the championship game, then the boyfriend has to let him fuck him. Looking for someone to play that boyfriend.
We could play it as the rival/friend doesn't have any clue about the bet or that he does know and it was all originally thought to just be a joke and doesn't know his boyfriend followed through, or even that all three were in agreement to it because it was supposed to be a one time thing but he didn't think his boyfriend would like it enough to keep going back for more. Or the agreement between all three just involved him giving my guy head, but he ended up unable to help himself and took it a step further without telling the bf. We can also combine ideas. lmk if you're interested