He blinks and Sokka looks at her again, quiet for a moment. He can't imagine why any Kaylee would have trouble believing she was beautiful (or very, very talented) but he hopes, at least, that Simon managed to fix that in Apocalyptica.

Or wherever it was that they started sleeping together.

He does the best he can, just in case, leaning forward to kiss her cheek and replying with "Of course."

Except that she's going and there is, so far as he knows, no way to get back.

This, somehow, doesn't stop him in the slightest from grinning like a fool when she asks him to believe, nodding once. "Now, now, don't get my hopes up - now you're just being cruel."