Dean pulled Sam's legs up a little higher and leaned up to kiss him, moaning into the kiss quietly as he moved against Sam, hips rocking a little bit harder. "Sammy," he breathed into the kiss, one hand coming up to cup Sam's cheek, his thumb stroking against his cheekbone. Damn it, Sam was way too handsome.
Pulling back from the kiss, Dean shifted them just enough to get a better angle and started thrusting his hips properly, hips tilted enough that his cock would brush against his prostate. Dean could easily presume that it'd be easier to hit it if Sam was facing down, considering that hit the g-spot better, but he wasn't planning on rolling Sam over. He wanted to watch his face.
"You're so fuckin' gorgeous," he murmured, leaning in for another kiss as he wrapped his hand around Sam's prick and started stroking.