Logistically it could be Arthur, but in terms of personality the mind just boggles. She'd talk him into a "Let's not and say we did" scenario, and that would be that.

I have to confess to a bit of a thing for Ron/Pansy. Although I suspect that would preclude Hermione merrily taking the kiddies to the station.

I always thought that Droit de Seigneur applied more broadly than just one's offspring's spouse. It applied to all of one's vassals (if it existed at all). Oh lord, I just looked it up on wiki and there's a picture. *sporfle*