[...Well okay he hadn't quite thought of it like that. And that does make things a bit more awkward but still.]

So what? I'm not the Fire Lord here! And I don't know what I'm like or how old I am in your time but I'm not any of that here either! I'm just a guy!

[And sure she's the Avatar. Aang's next life and all that. But in this place, to him she's just a girl. A... very attractive and interesting girl. A friend and... thanks to circumstances out of their control, maybe something a bit more? After they get over the weird anyway.]