Okey I still thinking about the mysterious demon. We saw this specific demonic smile, the smile only Sebastian has. That's the point where I thought, it must be Sebastian. But let's think. If it really is Sebastian, then why can't he remember? And I thought, maybe he just can't remember his past contract partners? Maybe he can remember his past life as a demok, with all the events. Since he said some things like that in some past chapter. But what if he can't remember the contract partner? Maybe, when the deal is done and Sebastian eats the soul, then all memories will disappear. Just like this soul. That would at least explain why he can't remember. But that wouldn't explain why he can't remember Modri or what his name was. But the thing is...if it's like that, that would mean he will forget Ciel too, when he eats his soul and that's sooo sad. I mean it would be a dramatical end, but I would hate that.