Those books would be bestsellers, or Chuck would have just written them, if he hadn't up and vanished (Dean still didn't think he was just dead). Regardless, it was probably a good thing if they didn't have Chuck around to witness this. That would have been horribly awkward. He didn't even want to consider it.
Shifting a bit, he wrinkled his nose at the feeling of Sam's finger. This was so weird. It was just there, solid, large, a little bony, and he wasn't sure he wanted to just wait around for the whole 'one finger, now two fingers, now three fingers' crap but he didn't feel like getting hurt by Sam's way-too-big cock either.
A low hum came at Sam digging his nails in and Dean bucked his hips a little, tugging some of Sam's hair.