This popped into my head a while ago and wouldn't leave me alone, so I had to write it. It's my take on the infamous Detroit scene Lucifer predicted, why Sam would say 'yes.' It's short, yes, but it does pack a powerful punch. (I hope).
SPOILERS: This won't ruin any episodes you have not seen. Minor references to Abandon all Hope,The End, and Free to Be You and Me, and to Dean's first death-or 100+ if referring to Mystery Spot.
This is the shortest thing I have ever written, so let me know what you think and I'll catch ya later.
Detroit---A not so distant future…
They hadn't been expecting the army of demons to attack. It was only supposed to be one, Cass had told them it was one, but the dark haired angel had been deceived. Now he was lying, unmoving, feet from Sam. There was a knife sticking out of his jugular, one of the demons having picked it up from someone-Sam having a vague idea who.
As much as Sam did care for Cass's well-being, it wasn't his immediate concern. His brother lay in a pool of his own blood, his skin still lukewarm despite the fact that he was no longer breathing. Sam sat on the road next to him, his head resting on his thigh, gently stroking his hair and trying to keep from breaking down. Dean was gone, again, and there was no Castiel to bring him back this time.
"Sam," someone said, the sound of flapping wings filling the air. Sam didn't bother turning around to see who it was, he already knew and he didn't care. "I am sorry." Despite the fact that he sounded sorry, Sam knew better. He could give a crap less about the entire human race, let alone one lone human.
"If you are hurting, I am hurting," Lucifer replied appearing in Sam's line of sight. He crouched in front of the two brothers, his elbows resting on his knees. He studied Sam for a moment, taking in his appearance, and said, "I can bring him back."
"Y…you're lying," Sam sniffed, a tear dripping from the tip of his nose. "Y…you just want m…me to say 'y…yes.'"
"Sam, I told you once, that I would never lie to you. Yes, I do want you to say 'yes,' but I am willing to do you a service beforehand. Even if it is to bring back my brother's vessel."
Sam was quiet for a moment, his eyes locked on his brother's pale face. He had blood leaking from his mouth, running across his cheek. Sam wiped it away with his sleeve, smearing red across his skin.
"I…I don't…" his voice trailed off, his eyes raking across his brother's body. Sam had heard each bullet slam into Dean's body, the demon having emptied every single bullet into him. The ironic part was it had been The Colt that had been used. A demon killed his brother with a demon killing weapon.
"Sam you're brother will be alive and whole. Hell, Castiel, too, if you just say 'yes.' Say 'yes' and you'll save their lives. Just say 'yes.'" Sam was torn, he really didn't want Lucifer to take him over but he didn't want to see his brother like this. Not again. It nearly killed him when Dean died the first time, he was one-hundred percent sure he wouldn't survive this time. He needed Dean. And he knew what to do.
"I want proof," he started sniffing again, running a bloody hand across his face. "I want proof they're alright before I say anything." Lucifer nodded, loose skin flapping with the movement. Nick, or whatever his name was, was most definitely dead. He had been ridden by the devil for a year, and he wasn't his real vessel. Sam felt for the guy, he did, but he couldn't spare more than a few seconds of remorse.
Lucifer clapped his hands twice, a groan escaping Cass's lips while Dean's wounds started to heal and his chest began to move. Sam sniffed a third time, gently laying his brother back on the road. He softly kissed his brother's forehead, whispering, "I love you." He pushed himself on shaky legs, looking Lucifer in the eye. "Let's get this over with."
"You need to say it," Lucifer pointed out. "The red tape will kill you."
"Alright, fine. Yes, you can have my body."
"You won't regret this Sam…"