[He takes a moment to contemplate that. That was a long time ago.]

Well, then it seems that this is one of those 'weird time travel things' after all. [He's made sure to use his best mocking voice for those last few words. But he grows serious, more serious than usual for this next part.]

Listen, because I'm only going to say this once. It seems you're here from a point in my past, or me from your future, however you want to look at it. In my time, you were transformed into your child body. It's been years since the last time I saw you as an adult. Now. Before I go on, I'm going to find my clothes, thank you very much. [He doesn't want to get into this naked, after all.]