The narration can do whatever it darn well pleases, thank you very much. And if that includes charm, well, so be it.

He starts to laugh a bit. "Yes, that is one way of putting it," he says with an easy shrug. "When you've got a daughter like Louisa, I suppose it all comes rather naturally. And nothing really surprises my mum and dad, either."

After all, look at their history. Mucking about with magical beings, raising half-Faerie boys, and generally being odd quirky - it isn't any wonder they've more or less made Yvaine part of their family already. (And the two haven't even hinted at marriage.)