Dean blinked a little at the way he felt Sam's arms spasm a little like that and after a moment he broke the kiss, as much as he really didn't want to. "Put me down, let me turn around," he breathed, shifting up a bit to ease Sam out of him. His legs were aching but he could definitely get behind... well, Sam behind him. He was sure it'd be easier for both of them.
Once Sam had set him down, Dean turned to face the wall and dragged a hand over his face at the very embarrassing and vulnerable position he had to stand in. One hand pressed to the wall and Dean rolled his shoulders a little bit.
The things he did for Sam some days were above and beyond the call of duty.