Getting Dean riled up had been all too easy. All he had to do was throw on a familiar face, say a few bitter words, and watch the man react. And, oh, he did. He tried to hide it, Lucifer could tell, but there was nothing that could be hidden from him. He was too old, too wise, and too clever for Dean Winchester, so he merely stood by and watched him spit out words of denial until that nasty, confident, little smirk was back on his lips. He was hurting, even if he wasn't letting it show. Lucifer wanted him to. He wanted Dean to unleash that monster that he had tucked away inside, the one that he had to hide every single day, in spite of his attempts at being normal.
Using Sam's face, Lucifer sneered at Dean triumphantly. His game wasn't over just yet. He wanted to see how far he could push Dean. See if he could get the man to unleash the monster on his own flesh and blood. "You know I'm right," Sam snapped coldly, "I see it in your eyes, big brother. You're nothing more than a walking timebomb and we're all just waiting for you to explode. Why don't you do us all a favor and end it already? Do whatever the hell it is you're gonna do and let us be. Dad's sick of you, Mom doesn't even know what to do with you, except play the sympathetic, caring mother card and God -" Lucifer felt an annoying twinge erupt inside him at the mere name, but he kept on for the sake of his game. "- only knows how much longer she'll be able to pull it off before she snaps and tells you to get away from her. And then there's me." Sam's face twisted cruelly, a disgusted smile forming on his lips. "I can't wait until you give me the excuse to bury a bullet into your brain. I spent years terrified that you'd be the one to do me in and now it's you. You're the one that has to die."
"You're not the brother I grew up with," Lucifer-Sam continued harshly, "you're some twisted freak that I want gone. I can't stand to look at you anymore. Every second of my life that I waste with you is just another second that I have to remember everything that you put me through. Hell? Watching you die?" He laughed. "That self-righteous heroic bullshit you pulled on me, because you're a greedy son of a bitch who's too pathetic to leave well enough alone when it's right?" Lucifer-Sam moved in closer, more than content to get right up in Dean's face. He wanted Dean to snap. To break. Use the knife, he urged him, looking down on him cruelly as though he were nothing more than the dirt at the heel of his shoe. "What are you waiting for, Dean? We don't want you. You were dead and you should have stayed that way."