Anon asked: are you shipping zucest only sexually or also romantically? do you think there is a realistic post canon scenario where it could happen? because it seems like azula has no love for her brother even though i can see zuko loving his sister (romantically or as a sister in general) if azula extended an olive branch, because he is kinda desperate to have a family anyway

I do ship them romantically. And while the whole "Azula doesn't care about Zuko" interpretation is a valid reading of the story, I personally believe it is incorrect for several reasons.

Part One: Past relationship

In book three, Zuko says that no one has been at Ozai's old beach house since their family was actually happy. That shows us their familial relationships all fell apart… but that they did exist at one point. And that, of course, includes Zuko and Azula.

Even episodes that show how dysfunctional their relationship has become, also give us hints that they did love each other at some point… and might still have some affection left. There's a reason Zuko has an emotionally charged battle with his sister, not with Ozai. Even "Zuko Alone", the episode that is often used to "prove" Azula was always beyond salvation, has a blink and you'll miss it moment of these two willingly, happily playing together (then they find out their cousin died, because they can't have nice things and neither can we).

Part Two: Rivalry and survival instinct

Most people see everything that took place during the first episode of book three as evidence that Azula never really cared about Zuko, since she threw him under the bus by telling Ozai he was the one who killed Aang. But what people forget or never even realized is why and when that happened.

Azula doesn't do things without a plan. She's not a Joker type of villain who does evil things just for the chaos it will cause. She won't do anything she thinks might get in her way… yet she brought Zuko home at the end of book two, meaning he would be the heir, not her. had control of the Dai Li, which means she could have betrayed imprisoned him after taking over Ba Sing Se - that would have been a basically perfect way of getting Zuko out of the way, instead of just lying to Ozai and hoping he'd be mad enough to revoke Zuko's right to the throne. But she didn't. And the novelization of the story explained why in the simplest of terms: He is her brother, and she welcomed him by her side.

And that lie to their father? It wasn't part of her original plan. She didn't even know there was a possibility Aang could have survived until Zuko accidentally gave her a hint when they came back home - and she needed to act fast, because her father would not accept failure. That's why she said Zuko was the one who did it. It wasn't an evil plan all along - it was either him or her, and Azula might care about him, but she cared about herself more. It wasn't hate or senseless cruelty, it was a matter of survival.

Part Three: "Out of character" kindness

Azula can unbelievably cruel. She's cunning, mean, and selfish. She also has a subtle pattern of doing nice things for the few people she cares about, and can even recognize her mistakes and apologize. One aspect that is often ignored about that scene of Azula talking to "Ursa" in the finale, is that that whole speech about how she uses fear to control people and that hurts both her and the people around her, didn't come from Ursa or any of the "good guys". It came from Azula herself. Even in her lowest, most unstable moment, some part of her is aware that what she did was wrong - and considering how she apologized to Ty Lee after hurting her feelings on "The Beach", it is fair to say that has been feeling like this for a while.

And how does Zuko fit into this? Simple: most of her consistently inconsistent kindness was directed at him.

Like I've said before, Azula essentially gave him the crown at the end of book two. When Zuko joined the fight at Ba Sing Se, it was one of the few times we saw Azula smile - not smirk, smile. And at the end of that episode we see her give him emotional support, saying Iroh was the one who betrayed him, and that Zuko restored his own honor that night. That's quite a lot of devotion towards someone she supposedly hates/doesn't care about.

And that wasn't the last time Azula showed him kindness. Book three was by far the one who showed us her softer side the most. In the second episode, right after she essentially stabbed him in the back, she lets him know she's well aware that he has been visiting Iroh. And Zuko, like the audience, wants to know what she'll gain from it. The catch was that there was no plan. She tells him to be careful, and the subject is never brought up again. She was simply helping her brother - like she did in Ba Sing Se.

The last major moment that shows they could develop a semi-healthy relationship happens three episodes later, in "The Beach". Zuko is all alone at their family's old beach house, thinking about their past… and Azula knew he'd be there, and chose to talk to him while he was dealing a looooot of complicated emotions over everything that happened in their lives. She managed to convince him to leave and join her and their friends - a simple action that, thanks to the novelizations, we now know meant a lot to Zuko.

Part Four: The comics and a botched redemption

One of the show's main writers confirm Azula was meant to be have a redemption arc in book four, and the person who would help her through it all would be her older brother, who would refuse to give up on her even when he saw her at her worst. But as we know, that book and all the stories it could have told were scrapped. Still some ideas were used in the comics… imperfectly (not to say "In insane ways"). Luckly, Azula's devotion to Zuko did manage to survive even such terrible writting.

In the comics, Azula has finally moved on from her past loyalty to Ozai, and now has only one goal: to keep her brother in power and protect him. She offered to kill people for him. She schemed to make him seem "better" and stronger. She full on told him they could rule together. Her affection for him is twisted, but it is very real.

Part Five: Could it become something more?

If you ask me, the feelings these two have for each other have gone beyond just familial love a loooooong time ago. Zuko's fever dream had Azula as the embodiment of temptation and Azula's voice actress full on said she voiced the bedroom scene seductively AND is a Zucest shiper. Combine those repressed feelings with Azula's obsession with Zuko and his refusal to give up on her, and you have the perfect scenario for a romance to bloom between them (and the fact that Zuko has a daughter in The Legend Of Korra, yet no one seems to know who her mother is, doesn't hurt this theory at all).