I suppose he wouldn't... He probably would just think it's a joke or an insult that a mere Earthling would dare to even suggest that his awesome royal blood would get mixed with theirs.

[Indeed, if it was the other way around... If it was her the one knowing and him the one not knowing, he wouldn't have believed her, right? Even with all the signs and tell-tales. Part of her still wonders how could it happen... Maybe it was just a one night thing and she got that lucky, or unlucky. But then why would he bother to tell her? Or seem worried about telling her?]

You know, I think that's a good idea. Probably he would prefer it too...