Not quite pretty enough for him to pass up on licensing fees, huh. She's not even offended. Under normal circumstances she'd just offer to Polymorph it off, and she in fact could offer that, but then he'll get distracted trying to think through whether he trusts her that that works and that sounds like a not-at-all-sexy direction to push him in. If he were slightly less of an alien she'd say 'if you owned me, you'd also separately get to decide if we had children', but he's an alien and that seems to run a genuine chance of stamping on something he's been assuming all wrong.
"Self-control can be a sexy quality," she says. "I mean, in this specific case I think it is slightly less sexy than self-control being not quite sufficient for the situation, but, you know, I admire it all the same."