Castiel finds a solution to his grace.
Cas and Dean fight.
Prediction: Sam and Castiel try to cure Dean.
This plays on the idea that the trials were never broken, and if Sam cures a demon, he will die. But he’s more than willing to do it, to cure Dean.
At first, Demon!Dean didn’t care if Sam died. But as Dean begins feeling like a human again, he begs Sam to stop before it’s too late.
My prediction for at least the first ep is that Sam will find Dean standing in the entrance of his doorway, eyes black, blade gripped in his hand, stuck under a Devil’s Trap. Sam will back away and call Cas. Dean will just laugh from the doorway, saying ‘C’mon, Sammy, don’t you recognize your own brother?’ and give him a sadistic, blade-induced smile.
2014!Dean was a demon and had the Mark of Cain all along. So he didn’t die in the garden when Lucifer snapped his neck, but was just unconscious.
End!verse picks up and the hunt to kill Lucifer continues.
You may wonder why Sam said yes to Lucifer. Here’s another theory.
So apparently a season 10 description was recently released (which you can read here). And in that, Sam is off chasing a missing Dean, and Cas meanwhile is working to fix Heaven.
I recognise the council has made a decision, but given that it’s a stupid-ass decision, I’ve elected to ignore it.
So this is my version.
Angel!Cas and Demon!Dean as Sam’s conscience. Total The Emperor’s New Groove style. Inspired by this post.
Because Dean is not a normal demon, he still has all his emotions. And he has trouble accepting that he’s a demon. Whenever he sees himself in the mirror, he begins feeling even more guilty than when he was a human. Sam finds him on the floor sobbing one day.