Part of why I am suggesting you try a few casual dates before that point. See how you feel after meeting a few different people. If you still feel the same, you can then have that talk.
I might phrase it a little differently. Besides which, how do you know Katara feels the same?
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Ha ha XD
I know all of that.
But how am I supposed to... do that? Hey Aang, I want to date your girlfriend from back home, is that okay?
[He slumps.]
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I might phrase it a little differently. Besides which, how do you know Katara feels the same?
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I don't.
[He hasn't gotten that far, yet.]
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[He strokes his beard]
You can spend a little friend time with her and try to gauge her feelings, if she gives a few signals then you can discuss with Aang.
[He finishes smoothing out the table]
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Looking a bit dejected, Zuko rises from his chair and heads for the door.]
Thank you, Uncle.
[Though he doesn't sound particularly enthusiastic, more like discouraged.]
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Before you go, what does a teapot wear to bed?
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I don't know.
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A nightea!
[He grins broadly]
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Good night, Uncle.
[And with that, Zuko leaves.]