[A vase fitting for the palace is almost certainly something he'd accept for Ciel's room - and if she phrases it specifically as something to use for Ciel he'd think it even more considerate than just a gift for him.
He's about to answer - most likely "what kind of butler would I be if I did not even think of something like that?", but her next words have him honestly taken aback.]
Friend? [There's no disapproval in his tone, it's just... because of his canonpoint, this is before his one single canon friend.]