Post Season 9 AU. At first, neither Sam nor Dean really grasp everything Dean's new demon nature means. With Crowley actually invested in Dean and Castiel trying to balance his presence on Earth and in Heaven, not to mention a few surprises that Sam has to deal with, the latest development in their lives may end up being a lot more complicated than they expected.

Companion one-shot to The Lucifer Problem. The epilogue addressed how Lucifer was defeated, but some people wanted to know how it all went down in more detail. So, this is the story of how Dean and Castiel refused to let Sam jump into the cage, and how they managed to defeat Lucifer anyway. Mild Sastiel.

Dean and Sam try to make it work, but after Heaven, it becomes clear to Dean that it would be best to separate. Sam decides to let Dean stop the apocalypse, while Sam takes on the Lucifer problem. After all, if Lucifer doesn't have a true vessel to take, he'll be that much easier to defeat. Sam goes off the grid, and not even Castiel can find him. Pairings: Sastiel