"So. Will you behave on your own or will I have to make you?" Lucifer asks in a deadly quiet voice, not releasing his grip on Dean's jaw. If Dean has even two brain cells to rub together, the answer had better be yes, he's planning to behave. Lucifer could do quite a bit more than just what he's done so far and has threatened to do in order to immobilize Dean.

That would also be the point where he stops caring if Dean gets any enjoyment out of this tryst.