Cas stared at all the memories of Sam that were in Lucifer's mind. He had been told that Lucifer was no longer capable of love, but he could sense the overwhelming emotion as it pertained to Sam. There was no doubt, the memories and stories of Sam had left an imprint in his brother's mind.
"He loves you so much," Cas whispered as he laid eyes on Sam.
"Maybe, but then again, maybe he's just trying to manipulate me into saying yes," Sam said.
"No, I don't believe that and neither do you, not really," Cas said as he observed Sam's body language.
"Fine, he loves me, but will he still love me when I continue to say no to him? Would he still love me if I threw him back in the… never mind, it doesn't matter how he feels about me or how I feel about him, it will only end in tragedy."
"You don't believe that you deserve to be loved," Cas pointed out as he stared at Sam.
"I don't, I'm the boy with demon blood, remember?"
Cas flinched as Sam referred back to words he had said to the boy when he first met him, but that was long before he knew him. His superiors in Heaven had told him that Sam was an abomination that would bring about the end of the world, but they had been wrong. Even that first time meeting, Cas had been surprised at how bright his soul shone, there was nothing evil about it, and yes the demon blood made his soul appear different, but the only difference was the amount of power that was there.
"I was wrong. I didn't know you then but I know you now and I'm honored to call you my friend, my brother. Your soul is one of the brightest souls that I've ever seen. You are a good man, one of the best and on your worst day, you are still better than most of the Angels."
"Cas, will you look after Dean for me? He's having a hard time…he doesn't understand."
"Neither do I Sam."
"Jimmy Novak once told me that being possessed by you was like being chained to a Comet. I didn't understand the analogy at the time, but I do now, instead of being chained to a comet, it's more like a black hole with me and my Dark Angel. Even though he hasn't possessed me, I'm still chained to him, I'm in the accretion disk and no matter what I do, I can't escape our bond. I'm not even sure if he or I can survive as individuals once we merge, the only thing that I know is that I will eventually say yes. I will eventually lose myself in him and I suspect that he will lose himself in me. I can't be the reason that the world ends, not after everything else that I've done, so I'm taking myself off of the board before anyone else can be hurt because of me."
"Nothing is worth losing you. I love you, Sam," Cas said as tears came to his eyes.
"I love you too Cas. You're my best friend and like a brother to me."
"Then don't go, stay and fight. Dean, you and I can find another way, we always do," Cas stated."
"The only other option would kill me anyways, at least this way, he'll still survive," Sam stated cryptically.
"What do you mean? Who will still survive?" Cas asked.
"I can't say anymore," Sam said.