Lucifer didn't hang around to enjoy the afterglow where he was. He pulled out sharply, still spilling over the last few pulses of come as he went, leaving it wet across Dean's thigh. He was enjoying watching Dean fall apart far more than his own involvement in it, and the power he had over Castiel himself. It was a gesture, a direct response to Castiel saving Sam's life before, and putting a spanner in the works. He wouldn't have his own vessel messing with his plans.

He pulled back the rest of the way, giving Dean a rough push on the hip so that he fell forward into his own mess.

He came to crouch beside the bed, where he could see his face, already dressed once more, still damp from his exertions.

"Now if I were you, I'd stay out of my way, and keep Sam away too. That is, if you don't want a repeat performance of this."