'Draw us closer'... [What a difficult request, with such a stubborn, disagreeable little master.
Sebastian lifts his head so that he can look Ciel right in the eye.]
You need but give the order, and I would die. Permanently and irrevocably. All my long years are yours to snuff out.
[It's no great revelation, perhaps - they've both alluded to this before with all their pleasant "not allowed to die unless I say so" banter - but isn't it nice to have it clearly spelled out? Not that Ciel would ever give that order. Sadly for him, he needs Sebastian alive.]