[He looks a bit like a pale drowned rat. And what little color he had drains entirely when she corrects him, back straightening like a rod and his smile falling away completely.]

I beg your pardon, ma'a- Lady Morgana. I'm sorry, I hadn't known.

[His eyes briefly flicker back towards Cat, looking every bit like a performer who's forgotten his cue, and she's of no help at all. She never told him she was nobility. Why wouldn't she have mentioned that?! Is she having a laugh? He's dealt with even fewer ladies than he has mothers, and certainly never in this context, and oh god he's made an awful impression already.

And then he belatedly realizes the Lady Morgana had gestured to a chair— and he quickly shuffles into his seat with a,] Thank you very much. [And adds, once he realizes he'd forgotten:] It's a pleasure to make your acquaintance.