He doesn't hesitate but to do just that. All it takes is Dean's spit hitting his eye, and Lucifer pulls him aside into position, lines up his fist and decks him as hard as he can across the face, enough to stun him. He holds onto Dean as he hits him, then opens his fist and gets a handful of Dean's collar instead, yanking him back in the other direction, and dragging him roughly down the hallway.

It doesn't take effort to choose a room. Lucifer knows the path through the bunker, picks out Castiel's former room, next to Dean's, and drags him right into it, dropping him on the floor and kicking the door shut behind him.

The next thing Dean got was a kick in the side.

"Do that again, and I'll come back when your brother's here."