The Doctor's eyes were wide. Mostly just because the Master had regenerated. But then also because it wasn't a form he'd have expected the Master to take. While he was holding her so tightly. Perhaps a bit too tightly, now that he came to be aware of parts of her body being pressed up against him. But the question... Well, it broke the spell.

He smiled before he could stop it and then he decided to just nod. "Yeah. Yeah, you are, but we definitely need to update your wardrobe."