Zuko knew that what he was about to do to his sister was wrong and beyond cruel, but the second their parents announced they'd be going away on a romantic vacation during the weekend, the goddamn idea wouldn't leave his head. He would be completely alone with Azula. It was his chance to get what he wanted... even though what he wanted was completely despicable.

He had been in love with his sister since he was a child. He had always known that it could never be, and for 17 years he tried to accept it, but he just couldn't change how he felt. No matter how many times he tried to be with someone else, he just couldn't forget her. And when Azula got a boyfriend, he went mad with jealousy. The boy was decent, but not nearly good enough for his sister. No one was good enough for his sister. And when he overheard her talking with her friends and mentioned that she had slept with him, Zuko was so furious it was nothing short of a miracle that he managed to stop himself from murdering the boy.

Yet now, after a year together, they were broken up, and Azula didn't seem to care at all. Zuko was relieved to know that that relationship had meant so little to her. This trip truly couldn't have come at a better time, and he would make sure not to waste this opportunity, no matter how much what was left of his sanity tried to protest it.

He went out, bought everything he needed and kept it all hidden in his bedroom, counting the days for their parents to leave. Once they were finally alone, Zuko waited for Azula to go to the basement as she often did, took a few deep breaths, and then got in himself, locking the door while she was distracted reading a book she had taken from the shelfs. When he sat next to her on the couch, she looked away from her book for just a brief second, then asked him what was on the bag, but without showing any real interest.

"Nothing important" he took the book away from her hands "But there is something very serious I need to talk to you about"

"It better not just be you being over-dramatic again, dum-dum"

"It's about your ex-boyfriend"

She rolled her eyes "Not you too. Zuko, I'm fine. I didn't even like him that much anyway"

"You were with him for almost an entire year" he argued "Why did you put up with him for so long if you were not in love with him?"

"Why do you care?" she snarled.

"I'm your older brother"

"Yes, and since you're older, you should know that girls have needs too, Zuzu" she said in that tone she always used to make him uncomfortable so the conversation would end. Oh, if only she knew the effect those inappropriate comments she made had on him.

"If he wasn't satisfying you, why didn't you try to find someone who could?" he asked, and she was clearly surprised that not only did he not run away like he usually did, but was also being so frank with her.

"In case you haven't noticed, boys tend to run away from me"

"So you settled? You wasted your time with something you knew had no future?"

"He was more than good enough in bed for me to put up with him for as long as I did" she answered bluntly, and Zuko could see that spark of malice and curiosity in her eyes. She was toying with him, seeing how far she could push before he backed off and he loved it.

"Saying someone is 'good enough' is just a kinder way of saying they're terrible"

"That's not true and I thought I was supposed to be the perfectionist here"

He chuckled "Which is why I'm surprised you were settling" he got a little closer to her "You deserve someone who drives you absolutely insane. Someone you can't stop thinking about and that you want so, so badly that it scares you"

"Is that why you're always desperate for a new girlfriend?" she mocked, but it wasn't enough for him not to realize she was thinking about he said.

"No, they were just distractions. Something to make me less frustrated while I couldn't be with the girl I want"

"Oh, so little Zuzu is head-over heels in love, huh?" she teased.

"You have no idea. I can barely even sleep thinking about her, and once I have a chance, I'm gonna use her in whatever way I can for as long as I can and I'm gonna make her scream for me over and ever and keep begging me for more. I'll make sure she is as obsessed with me as I am with her and I'll ravish her every single night" his sister was looking at him with wide eyes, but didn't pull away when leaned in to kiss her, gently pressing his lips to hers for a few seconds while she didn't move at all.

Zuko took advantage of her hesitation to deepen the kiss, his tongue exploring her mouth. For a few, precious instants, Azula kissed back, allowing him to pull her closer, tugging at his shirt, letting her tongue toy with his, and the cutest little sighs escaping past her lips every time she'd try to break the kiss for air, but Zuko he didn't allow her to. After a few instants, he brought a hand to her knee, quickly moving it further up her thigh, sneaking underneath it her skirt and touching her over her panties, making her jump away from him and then look at him in disbelief, her eyes wide and cheeks burning red.

"What did you... what the hell was that about?" she said, out breath and trying to pretend she was furious, but Zuko could tell she was just scared, both of what he had done and of her own reaction. As she got up from the couch, he did the same, grabbing her by her arms and keeping her close to him "Let go"

"You liked it" he didn't even bother trying to hide his smirk. He had expected her to fight him the entire time, but having her actually play along, even if just for a little while, only fueled his lust for her. Azula managed to break free of his grasp, and he pinned her against the wall when she tried to run away, causing her to hit the back of her head.

"Let go of me, you pervert!" her tone was much more convincing now, but her pleading eyes gave away just how powerless she was already feeling. She was a better fighter than him, but he was physically stronger and he had it all planned. His sister had always been the smart one, and it was very clear that she was already starting to realize that he would get what he wanted, no matter how she hard she fought.

He silenced her with a kiss, holding her wrists and holding them above her head. Azula continued to fight him off, and Zuko could feel the metallic taste of blood as they both bit each other's lips. He rubbed his quickly hardening cock on her, hearing her groan each time he did so. Eventually, he let go of her wrists and started feeling her up, his hands groping her everywhere. Azula broke the kiss, but wasn't able to push him off, and he just kissed, bit, and sucked on her neck, feeling her body trembling against his own and hearing her sweet little moans.

Finally, he backed off, allowing her to run... or at least try to. Taking those self-defense classes with Ty Lee was the best thing he could have done. With just a few strikes, his baby sister was completely paralyzed in his arms.

He quickly dragged her to the middle of the room, laying her across the cold metal table. He slapped her ass and rushed to get the red ropes, quickly binding her right arm to one of the table's legs, then did the same to the left one, making sure she wouldn't be able to escape. Azula spat on his face as he managed to trap her where she was, and Zuko simply smirked and brought her spit to his lips with his thumb before kissing his disgusted sister. Just to be safe, he used the third rope to bind her torso to the table.

His sister screamed and insulted him the entire time, and even though it was practically impossible for anyone to hear it, Zuko still decided it was better not to risk it. He got the knife his uncle had given him as a gift when he was a kid, and started tearing his sister's shirt, and used it to gag her. Even though he would not be able to see her breasts just yet, he got her bra out of the way as well. Finally, he pulled down her skirt and panties, leaving her fully naked. Azula tried kicking him as he got his phone and starting taking pictures of her. Even though he did want to have something to remember the beautiful sight that was his little sister completely vulnerable and exposed, looking at him with that angry yet scared face, his main motive for taking those pictures was to make sure Azula would keep quiet. She was too proud to risk letting someone find out about any of this, and even though he'd never let anyone see those images, he knew she would never be truly sure of it.

Zuko freed his cock and started rubbing it against Azula's pussy, seeing her entire body tense up. She was wet, but not enough to take him just yet. Still, he just couldn't wait. He needed to be inside her. His sister tried looking at him as he pushed the head of his cock into her little hole, silently begging him not to do this. He ignored her plea, going deeper, closing his eyes and moaning as her walls squeezed him. Her muffled cries of pain as he kept trying to force his cock inside her cunt were driving him mad.

"Fuck you're, tight" he panted, stopping his movements as managed to get half of it in. Azula cried out again as he inserted one finger in her asshole.

If her pussy is this tight, I bet it's going to be even better when I fuck her ass, he thought to himself, smirking as his sister panicked when he added another finger, just to tease her.

Grabbing her waist with both hands, Zuko started thrusting into her again, feeling her clench around his cock as it went further into her. This time, he didn't stop until he managed to force her to take his entire length, seeing Azula tremble and squirm. He showed no mercy, loving her tight grip around him, and the way she would oscillate between pathetically trying to get away despite it being impossible and then just staying still, letting him do what he wanted until the pain was too much and she'd try to fight him off again.

"Sssshhhh" Zuko gently started rubbing her back "I'll make you feel good soon, I promise. Just let me enjoy this for now" he slapped her hard on the ass and started thrusting faster, making Azula panic and cry out again. It was no use, he didn't stop until he climaxed. He stayed inside her for a few more moments, then pulled out, seeing his cum dripping down her trembling legs.

He allowed his sister a minute or two to rest, then gave her ten slaps without warning. He gave her another short break, then ten more slaps. Then fifteen. Then twenty. Then over and over and over again until he had long lost count and his hands were burning up and as red as Azula's delicate skin. His baby sister stopped struggling about half-way through the spankings.

Zuko started kissing her lower back and slowly moved upwards, licking her neck, wiping away her tears and playing with her hair.

"I'm going to give you a choice, Zula. You can either give me a blowjob like a good sister or I'm going to fuck your tight little ass" he said, making her grimace. He took the improvised gag out of her mouth "So? Which is it?"

"I'll be good..." she sounded so weak and humiliated "I'll be good to you"

He smirked, kissed her forehead, then grabbed her hair and forced her to bring her lips to his cock. Her hesitant little licks made his heart beat to fast he thought it was going to explode. He watched as she awkwardly shifted on the table, moving as much as she could, trying to get into a more comfortable position, licking his entire length with her eyes closed, an expression of pure disgust in her face.

When Azula finally started to suck the him off, taking just tip in her mouth Zuko lost all control and simply forced her to take all of it, hitting the back of her throat. Oh, how he enjoyed watching her eyes opening up and widening in panic as she choked on his cock. But it still wasn't as good as the obvious pure hatred she felt when he smirked at her.

"I should have fucked your pretty mouth a long time ago, Zula. You were made for this" he teased, speeding up as his sister gagged and cried, but continued to let him use her as he wanted "You better swallow it all when I'm done, or it's going to be worst for you"

Azula did as he told her to, swallowing his cum when he finally spiled himself, moaning her name. He gently massaged her pretty face once he noticed her jaw was locked, then ran his fingers through her hair as he let her breathe.

"You made me very happy, Lala. You were a good little slut"

"Let me go" she begged. Zuko just smiled, kissed her hair and gagged her again.

"I'll untie you eventually, but you're not getting out of this basement until our parents come home" he grabbed and pulled her hair and forced her to look at him "And you're not gonna tell them about any of this"

Coincidentally, Ursa called him right at that second. He groaned in annoyance but still answered it

"Hi mom" he said while still caressing and groping his sister "Are you guys at the hotel already?"

"Yes, the place is wonderful" she said in that tone that made it clear she was once again under the illusion that this time everything would go right and that their family could still become as perfect as she had wanted it to be "In fact, your dad and I were thinking about staying for three more days"

"Really?" he struggled to contain his excitement.

"We can ask Iroh to stay with you guys if you need"

"Don't worry" he said as smirked at his sister, who still looked like she wanted to murder him "Azula and I are going to love having the house to ourselves for a few extra days" Azula's eyes widened in terror again.

"You guys are getting along?" his mother sounded so happy.

"Oh yes. We're having a lot of fun together"

"I'm glad to hear it, honey"

"Go enjoy your week off, mom. You deserve it" he was desperate to end the call "We'll be okay"

She chuckled "Okay, I got it. Go back to whatever it was I interrupted"

"Thanks. I swear I'll call you later" he hung up, turned off his phone, and grabbed the bag he had brought to the basement with him "Looks like I get to keep you for myself for a little longer, Lala"

Despite the obviously vulnerable position she was in, the murderous rage in her eyes was enough to make him hesitate to touch her again.

But only for a moment. The sick lust and twisted love he felt for her overcame any fear, doubt, shame or mercy that could ever try to hold him back. He wanted her. He had always wanted her, and now that she had no way of escaping him, he was going to take full advantage. it didn't matter if this all backfired on him eventually.

He poured some lube on his cock, then pressed up against her asshole. He was pretty sure the angry growls being muffled by the shirt on her mouth were the world's worst insults "You didn't really think I'd miss this chance, did you, Zula?" he started pushing into her, and once again her resistance and panic only turned him on even more. She could struggle all she wanted, but her body still seemed to have been made just for him, and if the feeling of her skin pressed against his already made him feel like he was in paradise, there were no words that could explain how it felt to be inside her.

It took some time, but he managed to force it all in, and he begun thrusting, gently and slowly at first, just enjoying her tight grip on him, then moving faster and faster with each second until even he was feeling some pain. He could almost hear her confusion in her mind when he suddenly stopped - and he was delighted to hear her involuntary moan of pleasure as he started rubbing her clit.

"I promised I'd make you feel good" he took the dildo out of the bag and slid it against her wet slit, then pushed it in and out of her, just as he begun moving again "I'll make sure you'll never want anyone else" he said as fucked her rough. Eventually, Azula started pushing back, taking both his cock and the dildo as deep as possible. Zuko didn't let himself fall until she reached her orgasm. She was shaking, and once Zuko removed the 'muzzle' from her mouth she started panting as heavily as he was. For a few instants Azula looked like she was feeling just as much pleasure as he was, looking far less afraid.

At least until he rubbed his quickly hardening cock against her again.