I'm Not Falling For A Boy (Because Falling's A Sin)
Part two of Every Song Is About You Eventually (A Series)
A song Sirius can’t identify at this point plays loudly in the living room as he dances with Mary. Mary was nice. She was always sweet and smelled like candy. And objectively she was hot, and she was hitting on Sirius, as she had been doing for the better part of the year. So Sirius only grows more annoyed at himself when he keeps glancing at Remus as he sits on the kitchen counter a room over, his eyes closed as he leans his head back against the cupboard. His hair reflected the colorful lights that himself and James had set up before the party. Remus sat there grinning, laughing slightly as Lily and Marlene talked with him. Mary was right in front of him. So why did he only want Remus? Why wouldn't the devil just give him one night free of this temptation?
Or
Sirius deals with a shit load of internalized homophobia/religious trauma and pushes his friends away, ends up alone, but eventually finds himself again.
Based on Kevin Atwater's Song 'Star Tripping'