Hank "Rusty" Truman asked: Should we discuss Zuko's foot fetish and how Azula appeases that?
We should. I think Zuko didn't really have a thing for feet (and for many one fetishes/kinks until he started sleeping with Azula. Since he is very passionate, eager to please his baby sister, and has a high libido that makes him more willing to try out new things (which is good since Azula gets bored easily). One of these things was giving Azula foot massages, that would, of course, lead to full-body massages, that would then lead to him fucking her brains out. Since he likes spoiling her, he'd also kiss her delicate little feet and even suck on her toes, giving a playful bite every now and again.
Azula likes being pampered and spoiled, she enjoys seeing how excited Zuzu is to always find new ways to give her any amount of pleasure, he loves how ticklish she is (especially because she hates it) and they loooove teasing each other. So, since the foot thing works for them, they do it A LOT, which ends up making Zuko get REALLY into it, to the point that he starts staring at her feet just as much as he stares at her ass, her boobs, and her pretty face.
Azula, of course, noticed it and decided to see just how much he liked it. She asks for longer massages, both before they start fucking and, if she lets Zuzu dom her, she'll want it as part of aftercare. If she's the one doming him that night, she'll tell him to kiss her feet while he bows down to her as a sign of respect before the fun starts. She has frequent pedicures to keep her feet clean and pretty, she paints her nails (usually red), she wears a gold anklet, and might even get a small, cute little tattoo on her ankle.
Zuko is way too excited about it all, and the first time she gave him a foot-job he looks at her like she's the most amazing thing in the whole world... sure, that's how he looks at her whenever they do anything in bed, but still, it counts.