AU Wolfstarbucks - Sirius and Remus have been fucking each other during OotP as a source of comfort to ease their shared grief. Somehow, miraculously, James comes back from the dead but Remus can’t help but be dismayed knowing that he’s only been a stand-in for James.
Cue Remus being a little passive-aggressive, jealous wet noodle. Sirius still tries to initiate but Remus is super annoying and withdraws, convinced it’s only a matter of time before Sirius chooses James. While Sirius confronts Remus one night, James walks in and realizes Sirius and Remus are having an affair.
This interests James. Deeply. And he comes to a few more realizations of his own. And he makes a proposition to the two of them…
Yes I love this!!! I am already a big fan of Sirius and Remus starting to hook up for the first time during OOTP as a way to deal with grief/loneliness/the horrors. And then James comes back! And Remus is like "oh well of COURSE the two of them are going to get together, they've always been obsessed with each other" and pulls away, is passive-aggressive, etc. Sirius doesn't understand why Remus is pulling back from him! James walks in on their confrontation and has to become okay with several things REALLY quickly, lol: both of his best friends are interested in men, they both sleep with men, they have been sleeping with each other.
And after the shock of it wears off, James finds he can't stop thinking about it. He's...way more interested than he should be in his friends' sex life. He definitely starts looking at his friendship with Sirius in a new light, too, because they've always been inseparable. Maybe there was something more to it. Maybe...what they had wasn't a normal friendship and is something else altogether.
Anyway James overcomes a lot of internalized homophobia and discovers he likes men. He especially likes men who are his two best friends. He and Sirius start hooking up and then they bring Remus in as their precious princess who they love to fuck and spoil, the end.