nicu_macaru
(Takes place during season 10. Sorry. It has spoilers. Don't read it if you don't want major spoilers on Dean. Kay, that's it. OH! And OBVIOUSLY Lucifer isn't actually in season 10, so he is absolutely, um, whatever you call it. 'Kay, happy reading!)
Lucifer is out of the cage. Sam is losing Dean.
Sam: With Dean out with Crowley somewhere, Sam finds himself searching for clues at the bunker. Castiel hardly visits anymore, making the younger Winchester feel more lonely than he already was. He doesn't expect a different angelic face to appear in front of him one day.
Lucifer: One minute, he's in the Cage, getting the living hell beat out of him by his brother, Michael, literally. The next, he's at the bunker's doorstep, with no idea what the place is or what he's doing there.