Sam and Lucifer have gone back and further since Sam has been born. Lucifer needed Sam because it mirrors his own relationship with God. It was weird to say nonetheless.

Lucifer sits there in the bunker as he smirks at Dean and their friend.

“Well, well, look what the cat dragged in..” he chuckles darkly. Dean stops in his tracks seeing his brother but he knew something was off immediately..

“Sammy..?” Dean asks wearily. Lucifer chuckles. “Nope.”