[He keeps his head respectfully lowered - partly because the last thing he wants is to frighten Ciel and be sent away, partly because right in this instant, just looking at Ciel has his blood boiling. Solid proof that something managed to temper with him without Sebastian even noticing, managed to temper with him and get away with it.]
I am a butler. [His uniform tells as much, but then of course... is he right in assuming Ciel now thinks the Phantomhive butler is Tanaka? He unfastens the pin on his suit jacket, presents it for Ciel to inspect - if it's a counterfeit, it's certainly indistinguishable from the real thing, Phantomhive family crest and all. Normally he'd never take it off even momentarily, but circumstances being what they are...]
And rather than a set estate, I serve my master wherever he goes. Currently, that is this place.