[Charles nods along.] It's like blue eyes. We're able to tell that a long time ago in my world, everyone had brown eyes until one day someone was born otherwise. We call that a mutation. But those blue-eyed people were still very few and far between. Brown-eyed people were frightened of them, judging by old talismans. Now it's considered ordinary.

[He'd like to think it'll be the same for his kind of mutation, one day.]

Yes, of course. [And if she warms herself in the process, then all the better.]