Sebastian obediently lifts his head, allows himself to be handled without protest or comment. He silently regards Ciel's face, how even his one blue eye is bloodshot and exhausted-looking, and there is nothing mocking in Sebastian's expression. No, he looks... almost wondering?
"No", he answers, softly in turn, the thoughtful expression not leaving his face.
Of course he expects human reactions from Ciel. They wouldn't be where they are, bonded like this, if Ciel weren't fundamentally and irrevocably human. However, he's come to expect them mostly in response to other humans. They have been together for well over a year now. His cold, cruel little master so seldom treats Sebastian as anything other than a tool, only worth something for its usefulness... and yet here they are now, in another of those rare moments when Ciel fails to act like Sebastian is nothing more than a demon.
That these moments should even exist is, he supposes, added proof of how very human Ciel is, in the end. He smiles, sure and steady.
"Does the young master recall what I once said? 'Even should my body be destroyed, if my master does not wish for my death, I shall not die.' Did you doubt my word?"
Ciel wouldn't recall, he knows - that hasn't happened for him yet. The destruction of a demon's body and its death aren't necessarily synonymous, but Sebastian purposely conflate the two, now. Why not minimise what happened when he has the chance, after all? Don't doubt his word; believe him invincible.