Okay, so I read this a couple years ago, and I'm not sure where it was. I think it was on Nifty, and it may have been listed on 'BestOfNifty,' but I'm not sure. It may also have been on here. The story was complete, and it's one of my favorites.
It starts at a school Prom - I think it was the Halloween dance. The protagonist is a Senior (maybe a Junior) and he's the Big Man on Campus. Popular, handsome, yadda yadda. The dance is held as a masque; everyone is in formal attire and wearing masks. Partway through the dance Our Hero is approached by another boy for a dance, which he grants. The other boy then disappears and Our Hero spends weeks trying to figure out who it was, as Our Hero is gay and interested.
Anyway - it's a great story, very romantic, and I'd like to read it again. I think one of the main character's names was Stephen, but I may be wrong about that.
Any help is (of course) much appreciated...
Scott