[He gives Ciel a long, wondering look. Doesn't he understand the question? No, he does, but... suddenly Ciel is so solemn, and right in the moment Sebastian can't think of why that is. "Hiding"? Sebastian hides everything that isn't part of his butler facade, most of the time, and the times when he does show anything else, it's only the sides of the demon he wants others to see. And yet...]
There are... [he breathes a laugh, although he's calm enough by now that it doesn't devolve into fits] so many things you do not think to ask me.
[Ciel owns Sebastian. Everything Sebastian knows, everything he can do, every memory and thought he has - they're Ciel's, but only if he requests them. Now, the second question... that one he does have trouble grasping; stares vacantly at nothing in particular after Ciel spoke, then turns his head to look at his master.]