Usually Inigo would be super shy about this sort of thing. Even with someone he likes well enough like Samata. (Maybe even moreso, since then her judgement of him means even more to him than it would coming from a stranger.) But maybe it's something about the party atmosphere, or maybe it's something about the masks, but it's giving Inigo a slight confidence boost.

Enough for him to smile from behind his mask when she offers, rather than get all flustered.

"Why, I'd be honoured."

He takes her hand. "Although the music is not.. entirely familiar to me, so we might have to improvise."