Teloch asked: Continuing on the mistresses bit. If the FireFoursome was established before Zuko's banishment, would they demand Zuko be faithful to them or would Azula encourage Zuko to add more to their little family(or rather toys for them to play with)? Like Suki, Jin, Katara, or any other girl?
If they demanded him to be faithful, I assume they would be very jealous whenever another girl so much as looked at him, and Zuko would be just as possessive. They'd all probably see everyone who is not part of their little group as "the others" - they might have some, or even a lot, of affection for them, but they'd sort of have this "Us against the world" mentality.
If they weren't jealous/possessive, I can see them having someone join them for a one-night stand, have some concubines, and, maybe even considering letting someone join their little group - but that person would have to be able to put up their insanity, and bring in a little of their own, without there being a clash of their personalities. My money is on Toph since she likes Zuko a lot, would love Mai's sense of humor, would probably a soft spot for Ty Lee because she's Ty Lee, and once they actually made up she'd probably respect Azula, and she'd relate to the struggles and traumas they all faced due to their families.