There's a moment of silence, then a soft gasp as Castiel follows the orders.

"Sensitive," he murmurs, just loud enough for Sam to hear. It's been a few days, and his body misses its master, misses large hands with clever fingers, and a hot, wet mouth, and wicked teeth.

Castiel can be vocal, responsive, and always, always so very sensitive to all sensations.

"Sam... Sam, I wish you could bite them for me..."