My master's country is called England - it is a small but influential kingdom with a ruling queen. [That's different from "where the two of you are from", but... Sebastian isn't really an Englishman, after all, and it wouldn't do to lie.]

My master is here, as a matter of fact - your wish may be granted at any time it pleases you, ma'am. The young master would be honoured to host you.

[He probably wouldn't like it, because the socialite lifestyle is a necessary evil to Ciel, but well... "honoured" isn't the same as "pleased".]