"This ain't gonna work, Sammy."
"It's going to, Dean." Sam mumbled somewhat gently as he pressed the plunger down, "I'll just keep doing it until I have you back."
The glare his brother shot would have killed a lesser man. Hell, with the powers at his control, it probably would have made Sam spontaneously combust. He never thought he'd willingly find Crowley useful again.
Of course, he never thought the angel radio wire-tapping headgear the asshole had used on Samandriel would work on his demon brother either.
Sam watched Dean watch him with eyes, green this time, so filled with hate, it made Sam want to cry. He'd fucked up so much, had hurt him so much, and Dean had forgiven it for him all.
Running to Stanford, letting Ruby corrupt him, freeing Lucifer and letting him use his body to beat Dean down, the RoboSam fiasco, not looking for him while he was in Purgatory.
Saying he didn't want to be brothers anymore...
In the resonating words of a great man: "Family don't end in blood."
Sam was going to fix this. Dean was his big brother and he would be human again, if Sam had to die to do it.