"As I said. You want this," Lucifer murmurs in Dean's ear, aware that Dean's well turned on by what's being done to him. "Maybe we should see if you can come again already. Or maybe I should make sure you can't come until given permission to."

In other words, finding another way to restrain Dean; even though with the way he's tied to the desk as Lucifer pounds into him, he's going nowhere fast.