[You belong to me: I will kill you before letting anyone else have you.
Sebastian has heard that before. With this master, with Ciel, he doesn't necessarily take it as an empty threat. Ciel, he believes, might do it, should it come to that. Were Sebastian not a demon, this would likely be a macabre thing to feel thrilled about. There's a glimmer in his eyes at the thought as he looks up at Ciel.]
Would I stand by you even with my leash undone, with no guarantee of a prize at the end? None but the thrill of serving you to break up the long, boring life of a demon?
[When he phrases it like that it doesn't sound like so bad a deal, does it? It even sounds like he'd consider it, doesn't it?
Won't you make an exception for me? We've been through so much - won't you spare me?
Sebastian has heard that before, too.]
Would the young master have me, did the contract not force me to stay? [Would you trust him without his collar?]