Nocturnal Emissions
It’s technicolor and vivid and wrong, wrong, wrong and when Sam wakes up, he’s dripping wet. As awareness returns he realizes that all the moisture he’s feeling isn’t sweat. His belly is wet- sticky with come and he’s gut-wrenchingly afraid that he moaned out a name just before he woke.
He manages to control his breathing and glances across the room to where Dean is sprawled on his bed, snoring like a buzzsaw. Nobody could fake that, he really has to be asleep. Doesn’t he?
Sam sneaks into the bathroom to clean up and Dean’s snores don’t miss a beat.