Coming back home had not been like Azula expected. She had been ready for people to be furious to see her 'free', not for them to treat her with such... indifference. She could tell there was no happiness, but there seemed to be no hatred either. Even the fact that she would share a room with her brother didn't get anything beyond shocked faces as reactions.
Some servants and guards, especially the ones she had banished mere months before when she was the Fire Lord, seemed to pity her for her breakdown, and Azula could hear them commenting about how happy she must have been feeling now that she was home, being cared for and spoiled by someone she knew would never hurt her. Zuko really had managed to convince everyone that he wasn't as insane and vile as every previous Fire Lord was. She was almost proud of him.
And to be fair, it wasn't hard to understand how no one else could see beyond his kindness. Azula herself had been fooled by it before, and considering how well he had treated her the entire day - offering her every kind of luxury she could want and more, as well as promising to let her train with him and help him rule the nation once she was stable enough - she would probably would have never noticed the truth if he had not decided to force her to face it.
So she was constantly waiting for his insanity to take over once again, even when he was being the perfect brother - especially when he was being the perfect brother.
But she did not expect him to want something like this. She was getting used to doing absolutely disgusting, humiliating things to please him and avoid his anger, but she wasn't sure she could stomach this. She was already on the edge knowing she'd be sleeping on her father's bed and that she'd have to see her mother in a few days, and having to wear Ursa's clothes and seeing Zuko dressed up as Ozai just felt so surreal and wrong that the princess thought she would end up breaking down and crying.
"Please don't make me do this" she begged, avoiding looking at mirror and feeling her knees shaking as her brother circled her, a stern expression on his face. While Ursa's robe didn't fit Azula quite right, being a bit too big, Ozai's fit Zuko almost perfectly, and even though he wasn't the much taller than her, the current Fire Lord was towering over her, making the princess feel unbelievably small and fragile. The unwelcomed memories going through her head only made it worse.
Her brother didn't answer, grabbing her chin to make her look at him after she looked away when he tried to kiss her.
"How could you do this to me, Zuko? You know how our parents have hurt me. If you want to screw our mother so bad, go after her and do it, just don't drag me into this"
"I don't want our mother" he promised, the hand that had grabbed her face now caressing her cheek.
"Liar" she said, struggling to fight her tears. It was already bad enough that, her entire life, their mother had always chosen Zuko over her and that no matter how much she tried to please their father, she had never been enough in his eyes. But this? Thinking that maybe, just maybe, she finally had someone who truly did love her, regardless of how sick said love was, only to find out it had never been truly about her? It was just too much.
Azula tried to fight him off when he started pulling her in for an embrace, but wasn't able to. It felt so strange, having someone who was practically a young Ozai holding her close, gently stroking her hair and rubbing her back. She didn't know if she did it because it was Zuko, or because she wanted to pretend he was father, but Azula allowed herself to melt in his arms, clutching at his robe and resting her head on his shoulders.
"We don't need them. We never did. I do love our mother, but now I can see that she wasn't perfect like I made her out to be, and even though I want her around, I don't need her anymore. All I need is you. And you know you need me too. I'll be good for you, Azula. I'll be your brother, your Master, your lover... and your father. I know you miss him, or at least who we thought he was, just like you miss our mother. But they don't matter now. From now on, I'll be everything and anything you need, just like it should have always been"
He paused and made her pull away slightly, looking at her with an unbelievable tenderness that made her believe his every word.
"We don't need anyone else, Lala. We'll be each other's family" he promised, cupping her face with his hands and kissing her forehead. Something in the way he spoke nearly broke her heart. He didn't sound like the horrible monster that kept abusing her, nor as an all powerful Fire Lord, or even just as her proud, stubborn older brother. He sounded like a little kid. Like the sad, lonely little boy she had known what felt like a lifetime ago, and who was just as lost as was after their dad became so cold and distant and their mom disappeared. She had turned away from him as a little girl, but she wasn't strong enough to do it now.
And even if she was, it would only be a matter of time before he found a way to force her to submit to him yet again. It was easier to just give in.
So she accepted him. Accepted her brother and all the twisted affection they both felt for their mother and father, throwing her arms around her Zuzu and kissing him with a passion she didn't even know she had within herself. Not to please him or to satisfy her own needs, but simply to feel him close to her, to claim for herself the demented love he was offering, allowing him to give into his worst instincts and being his absolution, just like he would be hers.
Azula pulled away, seeing her brother gasping for air and looking at her in pure adoration. Slowly, the princess tried acting a bit more like her mother, trying to move like she did and look at Zuko in that sweet way Ursa used to look at their father. While Zuko managed to emulate Ozai immediately, she struggled to do her part quite right at first, the trill and pressure of having her every action scrutinized both by her brother and her father being almost too intense for her to be able to stand it.
When she finally succeeded, caressing his cheek just the right way, Zuko - Ozai, finally returned her advances, grabbing her wrist, kissing it before twisting it slightly, pulling her to him and conquering her mouth with a fiery kiss that made Azula feel like her knees were about to give out at any second. Everything about the man kissing her had changed. Zuko's warmth and the loving embraces he'd give her whenever she did something that pleased him, and even the strange tenderness hidden behind even his more forceful touches were gone, truly making her believe, even if just for a few moments, that she really was kissing her father, and she almost panicked at that thought. Her hallucinations could make her see people that weren't there, and it wasn't unusual for faces to blend in her mind and for a vision to look like one person, but sound like someone else.
A low moan escaped her lips when the Fire Lord pulled her hair, making her throw her head back, and started marking her pale flesh with his teeth. The princess buried her hands on his (too short) hair, eventually managing to make him stop so she could look at him. She saw a smirk that didn't belong to that face. It wasn't malicious, playful, or even predatory. It was cruel, and belonged to a man that believed himself to be superior to everyone else. Her brother did it well enough that it could almost fool her fragile mind. But those golden, lust-filled eyes could only belong to one person. They resembled Ozai's, but there was always a spark of genuine affection burning behind them.
Ozai would have never look at her - or at Usa - like that.
The pair kissed again and again, and Azula tried to be as gentle as she imagined Ursa would have been with Ozai or with her new husband, and gave her Zuzu those sweet looks that her mother had always given Zuko, and that she had always been so jealous of. Her brother's touch was as firm as ever, but it very clear that he was trying to hold back his own lust, emulating what he assumed Ozai must have been like to their mother. As they made out, the robe Zuko was wearing got a bit looser, and he took to the change to make Azula touch him. Her hands felt up every muscle on his back, stomach and chest, and she had to fight the impulse to bury her nails on his hot skin.
Suddenly, Azula found herself being forced to turn around and face the mirror, watching herself being manhandled as her brother's hands freely roamed her body, sneaking underneath her clothes to grope her everywhere. He kept adding a little heat to his palms and fingertips, sometimes just teasing her, other times leaving small burn all over her body. Azula felt a strange need for more.
The princess closed her eyes and brought a hand to the back of her brother's head as he kissed and sucked on her neck. They had already had sex more than enough times for Zuko to know what she liked, and she found it harder and harder not to enjoy the things he did. Sometimes she even forgot how bad she wanted to hate him for hurting and controlling her in every way he could.
She let out a little yelp as he grabbed and pulled her hair.
"Keep your eyes on the mirror" he commanded, nipping at her ear before sucking the lobe into his mouth.
Azula put her hands on the mirror for support as Zuko made her bend over a little, lifting up her robe and rubbing his hard cock on her pussy to get it wet, the head teasing her clit. She bit her lower lip as he put it in and started thrusting into her, going a bit deeper and picking up pace each time. The princess felt ashamed of herself now that she could truly see how desperate and needy she looked whenever she was getting fucked by her brother. Her face was burning and she wanted to look away... but she couldn't help but look at her own reflection, watching herself being ravished as it happened, seeing her body's reaction as her brother used it as he pleased, caressing, groping, pinching, slapping and even burning her flesh. The burns would probably be healed in a day or two, but they still brought tears to her eyes, while also bringing her unbelievable pleasure.
Zuko suddenly pinched and twisted her nipples as his cock went as deep as possible and Azula started moaning a bit louder, which only made him do it again, being even rougher this time. One of his hands grabbed her throat, while the other went in between her legs, rubbing and stimulating her clit as he pulled back just enough to leave just the head inside of her, before shoving it all back inside, making her head spin.
She started panicking when the hand around her neck started heating up, burning her skin, but Zuko's hold on her made it impossible for her to escape or push him away. When he finally let go, he smirked at the sight of her tears and of the mark he had left on her.
"Someday" he whispered to her "I'm going to burn you enough to leave a scar. I'll claim you, like you claimed me"
Those words, along with his impossibly fast movements and the obscene image reflected before her eyes, finally pushed Azula over the edge, and she would have fallen to the floor if her brother had not been holding her. Since she could barely stand on her own, Zuko picked her and carried her to Ozai's bed - their bed. Carefully, he tended to the burns he had inflicted on her, before climbing on top of her and sucking one of her breasts while groping the other. The sight felt unbelievably dirtier now that she was wearing Ursa's clothes.
Zuko started to fuck her again, making her trash around on the bed. It didn't take long since he had been delaying his own release for some time now. She couldn't help but smile as he screamed out her name as he rutted in her. She caressed his cheek and Zuko pressed a kiss to her palm before capturing her lips with his own.
"I love you, Lala" he said, already starting to drift off, falling asleep after a few moments. Despite the insanity and depravity of what they had done, Azula felt at peace for once, and quickly joined her brother in his slumber, still feeling him buried deep inside of her.