Considering he has the full weight of an archangel on top of him, Dean would be lucky to get a centimeter away.

"Now, now. Who says I'm done with you?" Lucifer murmurs, rocking his hips forwards once to make his point. The sooner he leaves, the sooner Dean can start trying to convince himself he didn't actually like what was done to him. So he fully intends to stay and use Dean as much as he saw fit, most likely until Dean couldn't take any more.