"Cas! Castiel let me out!" Sam yelled banging on the unbreakable glass.
"Sorry Sam, I know the plan. The demon inside Dean is going to kill you. Then leave Dean's body, he will be heartbroken, God only knows what he'd do. Probably something stupid, and this time I'm not going be here to save him." Cas said looking anywhere but Sam's eyes.
"So what you're gonna take my place? Huh, I thought it was the plan to kill me?"
"It is, but I can sacrifice myself and get the demon out of him." Cas explained finally meeting Sam's eyes.
"And you think that better? You dying instead of me? Do you really think Dean won't be sad, angry, mad?" Sam asked.
"Maybe, but you're family, I'm just - me. He'll get over it."
"No, NO. Castiel Angel of the whatever, YOU ARE FAMILY. we love you. Dean loves you. And I know you know that, somewhere. We're family." Sam said tears pooling in his eyes. "Please don't do this."
"I'm sorry Sam, I really am. Another day another lost. It isn't fair. But it's life... Take care of Dean for me." Cas turns to leave. "Oh and just so you know, you're family too. I love you guys too." He says as he leaves.
Two days later
"Cas, no." Dean crawled to Cas's lifeless body. "Come on you son of a bitch. Wake up." He screamed.
"Dean, shush. It'll be OK." Sam said hugging him older brother.
"You knew did you?" Dean cried punch Sam's other shoulder that wasn't covered by his face. "You son of a bitch. You should of stopped him... I hate you...Why."
"Shh. It'll all be OK. Don't you worry." Sam said rocking his brother back and forth.
Later that night.
Dean laid Cas's- Jimmy's body down on the bed.
"Dean, we need to burn it." Sam said sadly
"NO!" Dean yelled. "No."
"Dean." Sam tried
"No... He'll come back, he has to. I will not burn his body, his vessel. I will not burn my best friend." Dean said pushing past Sam to grab a beer.
Sam sighed. I'm going to bed then. Night." Sam patted Dean's shoulder before leaving.
Once Sam was in his own room, he grabbed out a pen and paper and started to wright.
Dear God,
Cas taught me all about real sacrifice
That it should be done from love...
That it should be done from necessity,
Not without exhausting all other options.
That it should be done for people who need your strength
Because they don't have enough of their own...
God, please we need Castiel. Please bring him back for us.
I need him, Dean needs him. Heck this planet needs him.
So please bring back the best family member we've ever had.
- Love Sam