He understands, and Castiel feels like he can barely take the mere thought of it, too intense, too intimate, too good for him right now. He wants it, craves it desperately, and his heart swells close to bursting.

"Sam..."

They're going to make love to one another. And Castiel slides into position easily enough, then. Spreads his legs farther, cups the back of Sam's head with one hand, fingers tangling in his hair, while the other hand rests on the pillow next to his head, for Sam to take.

Just like that very first time between the two of them.

"Please..."