Dean seemed so very sure of himself. That, Lucifer found, was both a complication and a weakness. It complicated matters because face-to-face, it was going to be harder for Lucifer to crack his shell. At the same time, that newfound confidence Dean was carrying now was only being formed because of that darkness inside of himself. It had latched onto a greater power, one that fueled his deepest, most terrible inhibitions, and it was bringing out the very thing that Dean had chosen to hide from the world upon his return from Hell. Him. The real Dean Winchester. He was quite the little monster. Right now, in the dark, with it only being just the two of them? It was probably very easy for Dean to openly portray the side of himself that he had kept hidden away for so long. But in front of someone else? Someone that he cared about? Someone who had an opinion that Dean greatly cared about? Well.
Fingers lacing among one another, Lucifer presented Dean with a calm smile. Then he vanished. Behind Dean, someone else appeared. The tall frame of Dean's younger brother emerged from the shadows and, with his dark hair falling into his eyes, Sam staggered out from behind one of the blood soaked tables with an uncertain look dancing in his eyes. It wasn't really Sam. Nowhere near the real thing, in fact. However, Lucifer had managed to get a firm imprint of the personality that Sam had shoved his way when he had paid the man a visit. He could play the part.
"Everything," the Sam illusion replied breathily. "It has to do with everything. Look at what you've turned into. This isn't you. You're not you. You're nowhere near the brother I watched die all those years ago." Sam stepped around the table and moved into the dark room, his eyes pinned on no one but Dean. Lucifer wanted Dean to acknowledge his darkness. More importantly, he wanted to make sure that the darkness he felt twisted into something painful. Because right now? Lucifer could tell that he was enjoying it far too much. "I don't even know how to talk to you anymore. And it's not the stupid Sith crap that's making it so hard. It's you. Look at you. Look what you've done. All this time, Dad was so worried about me being the one to turn into a monster." Sam shook his head, gaze dropping downward to meet Dean's eyes. "And in the end, it turned out to be you."