It wasn't the first time Dean had done this--gotten off with someone else in the room--but it was the first time that he'd done this with someone watching him the way Castiel watched him, so openly, without judgement.
He moaned, softly, hips pinioning, grip tightening, as he urged his body towards completion.
"Castiel," he begged, though for what he did not know.
It didn't take long, his come painting his chest with long, white, stripes.