Castiel sighs softly into the kiss, welcoming Sam's tongue into him as he welcomes all of Sam, with quiet delight. His eyes open halfway when the other man pulls back, a smile softening his kiss-swollen lips.

"Good morning, Sam. I feel well rested," he admits. It's rare that he sleeps poorly when he's with Sam.

And it takes a moment, but he does seem to realize, after a while, that he's on his back. "And much better, it seems."