This was written for a prompt, received during my open floor session earlier this year, submitted by VioletEyed-Demon.
Occupied
James nearly choked on his tongue, neatly cutting off the next call of his best mate's name, stumbling into the Sixth Year Gryffindor boys' dorm.
Sirius was wearing one of his many bright blue shirts - brings out his eyes, makes the girls go all fluttery, he said.
Rather, he was half¬-wearing the thing, the buttons either opened or quite possibly scattered to the corner of the room, its collar dragged down to his waist, baring his back, muscles tense and coiling as he shifted.
James didn't really want to be observing these tiny details, but his brain seemed to be picking up on them as a better alternative to examining the reason behind Sirius' state.
Remus was sprawled out on the bed beneath Sirius, shoulders straining a bit at the weight of Sirius' elbows, hips twisting beneath Sirius' own.
Given the way his head bent powerfully upwards towards Sirius' as they kissed, however, and his hands stretching to clasp at Sirius' arms - dishevelling his shirt yet further - James gathered that the quieter boy had definitely assented to being pinned to the bed.
And quite, quite thoroughly snogged. James backed out of the room, mind in a bit of a whirl, and shut the door before sliding down it to sit on the floor.
Later. Much, much, later, when all parties were clothed and not . . . flushed, and decidedly not freshly snogged, James would bring this up to them.
Interrupting now would not only be tremendously awkward - for everyone, but most particularly for James himself - Sirius was likely to respond with a hex before identifying the intruder. He was always testy about being interrupted when he was so occupied.
Not to mention the trauma James himself would experience from the state of his friends if he had stayed and seen anything further.
~Fin~
The original request was for James walking in on Sirius pinning Remus to the bed, snogging his brains out. Achieved?
A bit later than usual because I was out getting chased down by roller-derby girls with bats. It was surprisingly fun, for what it sounds!