This was one of my favorite stories back in the day, it was an original M/M fiction but I forgot the title. In the first chapter, one of the characters dresses as a schoolgirl and ends up sleeping with the other male character, who was so high off his ass that he didn't know he had fucked a boy.
At some point later in the story, they go ice-skating, and I think skiing maybe. I don't remember a lot of it, but I wish I did.