The demon slips out of Sam's body in the morning, laughing, gleeful. Bye bye Sammy. Ooh, it's been fun. Kiss big bro for me, will 'ya? Oops, you already did.
Days later, Sam can tell that Dean just can't take it anymore. He smells like Jack, but Dean's not drunk.
"Always wanted you, Sam. " Dean grins, bright and painful. "I'm one sick fuck, right?"
"Wrong," Sam whispers fiercely. "This is who we are."
Sam lightly brushes his fingertips against Dean's jaw. "Your choice."
Dean blinks slowly. He steps into his brother's arms and gives up control.
And now we're done. I'll be over in my corner wibbling if you need me.