"What are you going to do?" Lucifer whispered. The figure grinned at Lucifer. The eerie orange light cast shadows on his face, making his eyes look like black holes, "I'm gonna make him hate your guts." NOTE: Contains language and violence
Lucifer is sent back to Hell and is mad that he couldn't use Sam as a vessel as long as Micheal got to use Adam. So Lucifer plans to get Sam's attention and hopes he can get Sam to summon him back to earth. (Might contain spoilers)
A Samifer fic where Sam finally asks Lucifer why the devil is torturing him in the psychiatric ward. Season 7 ep 17 The Born Again Identity.