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Chapter Text

You hated Illumi Zoldyck.

And his indifference to your feelings made them stronger.

For as long as you could remember, you and Illumi were constantly paired together in your missions. Your family, the Iwamira family, was one of incredible strength and influence that ran through generations. You were the most respected and feared family of assassins. Well, after the Zoldyck's that is.

There had always been an unspoken rivalry between the two families. Each trying to outdo the other in any way possible. It was only a few years before you were born that the head of the Iwamira and the Zoldyck families decided that joining forces would be of far more benefit for the both of you.

The relationship between the two bloodlines was strictly professional. A give and take type of relationship where an enemy of theirs was immediately deemed an enemy of yours, and vice versa.

Each member of the Iwamira was paired with another from the Zoldyck. You and Illumi, being roughly the same age, naturally, were put together.
Initially, you did not mind him. You both learned from one another during training and although you never seemed to grow closer or form any other sort of relationships, neither of you cared.

You had never considered yourself a social person, but it would definitely seem that way when compared to Illumi. He only spoke when he deemed it necessary or when spoken to. Not to mention his face, it seemed like he was constantly wearing an expressionless mask. Throughout the years you has trained with him, you never saw him express any form of emotion. The only time you knew he was upset or angry was when you felt a shift in his bloodlust. But even that was rare.

Overtime, you found his silence to be comforting. He was a man of very few words which was okay. Throughout the years you had been with him, you had never faced any issues with him. Up until recently, that was.

During the last few missions you had together, you started to realise that Illumi suddenly developed a suffocating aura of arrogance around him. He treated everything like a competition. Who would find the most information on a target? Who would arrive at the location of the mission first? Who would kill the highest number of enemies?

And it was almost always him.

Now, you were a very well respected and powerful assassin, there was no doubting that. You were even set to be the heir of your family. But Illumi always seemed to be better, faster, stronger and smarter than you.

You initially discarded this change as friendly competition, perhaps you would even use it a way to improve your skills.

This change in Illumi was very small at the beginning. He would simply comment things like, "You're late" or "Better luck next time". And it was fine, it wasn't like you hadn't heard or experienced worse as a result of your profession.

But now, he was basically just insulting you.
"Is this the best you can do? I expected more from the heir of the Iwamira" he would retort with a smug look on his face before walking away.

And you were at the end of your straw. If he wanted a competition, he would get one.

The next day, we're both assigned the task of assassinating a very well known gang leader. Of course the public did not know who he was. Not even the CIA would have heard of him. Due to the nature of your job, you met many people like this. Rich and powerful criminals that had enough power to remain unknown to the public. As far as the government was concerned, these people did not even exist.

Whilst scrolling through the files Illumi sent, you discovered two things. The first was that your target was notorious for illegal distribution of drugs and that he ran one of the largest sex trafficking rings. The second was that he was hosting a huge party tomorrow with a large number of his high profile clients. And you and Illumi were to infiltrate this party and kill him without getting caught. This was going to be one of your biggest missions yet.

Your thoughts were interrupted when you heard a knock at your bedroom door.

"Come in." You retorted just loud enough for the maid on the other side to hear.

The maid opened the door and bowed quickly before entering with what seemed like a dress and a box in her hand.

"Good evening, Mistress Iwamira, my name is Mariko," she began. You sat up from your bed to face her. She was a short, slender, bronze skinned woman fitted in a tight dress shirt and high waisted dress pants. The first two buttons of her shirt were undone which made her already large chest even more noticeable.

Although she kept her head down, you knew that she could feel your lingering gaze on her figure, even as she entered and set the items down on your dress table. "I was instructed to deliver to you the outfit you are to leave in tomorrow. It is going to be a rather luxurious party and you must blend in with the rest of the crowd. Your father asked for you to try on the dress in case any alterations must be made." You tore your eyes away from her as she handed you the dress so you could try it on.

You grabbed it and walked to your closet to try it on. After a few minutes of trying squeeze yourself into it. You finally managed to get it on and stopped to admire it in the mirror.

It really was a beautiful dress. It was a spaghetti strapped navy blue silk dress with a plunging neckline that highlighted your breasts and left nothing up to the imagination. It's tight fit hugged your slender waist and wide hips. You looked down to examine the rest of the dress which flowed all the way down to your feet with two large slits of both sides of your legs that came up dangerously close to the top of your thighs.

You turned around a looked over your shoulder to examine the back of the dress. It hugged your hips and ass before flowing down to your feet.

It was perfect.

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You spend majority of the next day doing some light training by yourself. Then when the sun was about to go down, so you decided to head back inside and start getting ready for your mission.

You jogged back inside the Iwamira manor, smiling at the maids and butlers that stopped to greet you as you passed them. As soon as you made it to your bedroom, you stripped off your clothes and stepped into the shower.

This was probably the hardest mission you have been assigned and you had to be extra careful. You had gone on numerous missions by yourself before. Illumi only accompanied you when it the mission required more than one person or when you had numerous targets to assassinate. This time, however, you only had one target, yet both you and Illumi were to carry this out together. This made you slightly worried. Just how difficult was this going to be? You quickly brushed those thoughts away, you shouldn't be thinking about that. Especially when you swore to yourself that you were going to show him up this time for all the times he insulted and looked down upon you.

You quickly finished your shower and got dressed. After doing your hair and makeup, you gave yourself one last quick look before putting on your heels and running down stairs. When you got down to the foyer, you were surprised to find Illumi already there making small talk with your father. He was in a fitted black suit with his hair down, exactly the way he wore it everyday. You realised that the buttons on the suit and his cufflinks were in reality his nen-infused pins. It was such a simple outfit, yet he looked...expensive.

You tried not to let your gaze linger as he turned around to greet you when he felt your presence. "Good evening Y/N," he started. You felt his intense gaze trial over your body slowly. "the car is waiting for us outside." he continued. You offered him a small greeting, before you both bid farewell to your father and walked outside. You continued to feel his eyes on you as you walked in front of him.

"You look lovely today" he said in his usual monotone voice, no hint of emotion behind any of his words. Before you had a chance to reply, he walked to your door and held it open for you. You gave him a strange look before muttering a small 'thank you' and getting in the car.

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Almost 20 minutes into the drive and neither of you had said a word. "Did you have a plan in mind for how we're going to execute this?". Although he did not react in any sort of way to your question, you had been around him long enough to know that it surprised him.

"Did you not read the files i sent you yesterday?" he turned to face you as he replied with a question of his own. "It was all outlined there, you could have at least done the bare minimum and actually read them." he retorted. Despite his harsh words, there was no malice in his voice. There never was anything in his voice and irked you to no extent. It was almost as it you weren't anything worth getting worked up over. Why was he acting so kind earlier if he was going to be an ass now?

He was right, you didn't finish reading them last night after you were interrupted by Mariko and completely forgot. But you weren't about to let him know that. "I did read them, but maybe if you outlined the plan clearly or even gotten someone else to do so, I would've then understood whatever it is that you meant. I. mean, if your'e incapable of writing simple instructions, maybe Milluki should be the one here." You knew that the rivalry between Illumi and his siblings was a very touchy subject for him. Even you knew this was a low blow. But if he wants to be an asshole then so would you.

"I will make sure to be more thorough next time," he replied, seemingly unaffected by what you said. You knew that wasn't the case though. "We will board the airship which will take us directly to where the partly is being held. We have to get in and out of there without getting caught. There will be around 700 high profile guests at this party and if they discover that we're there, it could cause problems for both of our families." He explained.

"There are going to be CCTV cameras around, how will be get past those?"

"Milluki will take care of them, he is to destroy all footage of that party right after we leave so that the security won't be on alert whilst we are there." He turned to look outside the window, resting his chin in his palm.

"For this to work, you and I are going to play the role of a couple." He said.

Your head snapped towards him but he was still looking out the window. "You're joking" you said in disbelief but he just turned to look at you with his signature blank face. You scoffed when you realised he was being serious, not that he ever wasn't. This was going to be a long night.

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A/N: Hi everyone!

This is my first book so any feedback is welcome! I'll be writing for other characters as well after I finish this Illumi fic. Let me know what you guys think!

Chapter Text

After an hour of constant bickering throughout the drive, you and Illumi finally boarded the airship. You were surprised to see that you weren't taking the Zoldyck's private airship just like every other time, but rather one from the Hunter Association. It made sense, bringing anything that belonged to the Zoldyck's would attract unwanted attention. And there most likely would be a large number of hunters attending this event too, so this would make sense.

However, you were still concerned about this plan. You and Illumi? A couple? Could he even understand human emotions, let alone replicate them? Not to mention, there was also a high chance that someone might recognise both of you. After all, the alliance between your families made you both some the most powerful assassins yet.

Your thought were interrupted as you heard Illumi call out to you. "Y/N," you looked up to see him looking back at you near the receptionist. "We're going to our room", he continued.

"Our room?" you turned to face him. "Don't you mean our rooms?". You had seen the bedrooms on this ship before, during the Hunter exam. They were fit with one small dresser an armchair and a single queen sized bed. There was no way you were going to share it one with another person, let alone him.

"No, I meant only one. We're supposed to be a couple, remember?" he deadpanned just before turning around and heading towards the elevator. You rolled your eyes and followed him in. He pressed the button for the third floor before saying, "By the way, it seems our mission might begin now." You looked at him from the corner of your eye. 'We aren't the only guests on this ship that are heading to this party." he continued, still looking straight ahead.

"You should have said so earlier" you replied just before you heard a ding to indicate your arrival at your floor. "someone might've recognised us" you lectured. As you were about to step out of the elevator, Illumi stopped you by propping his arm out slightly by his side. You looked up at his expecting face tilted towards you. After a few seconds you finally understood what his gesture meant. "Right. A couple." you rolled your eyes and mumbled before linking your arm with his stepping out of the elevator.

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Your worst suspicions were confirmed when you entered the room. It was exactly how you remembered it to be, yet it felt smaller. You couldn't help but wonder if it was because of his presence.

"I call shotgun for the bed!" you exclaimed.

"Shotgun?" he questioned. There was nothing to indicate his confusion but a slight head tilt.

"Yes, shotgun," you retorted sarcastically. "I get the bed".

"Oh." you heard him mutter. "That's fine. I was not planning on resting", he replied. You threw yourself onto the bed as he walked around it to the left side of the room and sat in the armchair placed near the widow. You shifted around uncomfortably on the bed, trying to find a comfortable way to rest. You glanced at Illumi from the corner of your eye when you felt his heated gaze your legs. You were laying down with your legs propped up, bent at the knees and the slits in your dress exposed your toned, slender legs. Your face burned as you realised that the already revealing dress had ridden up, nearly exposing you ass. He must have felt your stare as he awkwardly cleared his throat and quickly looked away.

You quickly readjusted the dress and flipped to face the other way, your back now towards him. You weren't planning on sleeping either as this was only a short flight, but you found yourself reconsidering now just to avoid any more awkward small talk.

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The soft tap on your arm and the voice of a strange man calling your name was what you woke up to. Your eyes snapped open to find a tan, brunette man with short hair towering over you. On instinct, you quickly grabbed the knife you had managed to hide under the pillow, slashing it across the strange mans face but he moved back just in time for it to slightly graze his cheek. He quickly grabbed your wrist, causing the knife to fall near the side of your head on the bed due to his harsh grip.

How in the world did he manage to get in here and sneak up on you while you were sleeping? And how did he get past Illumi's En? Speaking of Illumi, where in the world did he go? You looked back at the man pinning your arms above your head. He seemed to let his guard how for a second as he began to say something but you used this chance to wrap both of your legs around his waist and successfully flip him over under you as you straddled his waist and grabbed the knife he knocked out of your hand earlier. Both of his arms were still free so you decided against holding up to bis neck, where he could easily grab grab it again.

Before he had time to register what happened, you swiftly reached back and quickly placed the knife to his groin. You smirked as you felt his breath hitch. You bent down, face close to his as you used your free hand to pull his hair back, forcing his head to stay on the bead. "I will only ask you this once, so if you value your life, you should so well to answer me", you snarled as your bloodlust flared, a sadistic smirk still plastered on your face. "Underst-"

You were stopped as you felt his bloodlust flare, its intensity made you freeze in place, you recognised it immediately. You slowly dropped the knife and stepped away from him as he sat up. You glanced down at his dress shirt, two of the golden pins that he used as buttons were gone, exposing his chest. In a blink of an eye, the assassin was stalking toward you, grabbing your jaw in a harsh grip and he pushed you back against the wall. "Threaten me like that again and you will not live to see the next day", he growled near your ear and if it were under different circumstances, you might've felt flustered by how close his face was to yours. But your life was in danger in this moment. You gave him a tight nod as he let you go and stepped back to fix his new 'disguise'. Of course, you had completely forgotten that his nen ability allowed him to change his appearance using the pins.

"You could have at least given me a warning before you decided to turn into a middle aged man", you responded, rubbing your sore jaw. He didn't say anything as he fixed his cufflinks and walked towards the door. "Come on, the airship is about to land", he said looking over his shoulder, all the anger and hostility from moments ago, gone. Like this entire encounter did not happen. How was he able to retrieve and then discard such intense emotions in the blink of an eye? Whenever he deemed it appropriate. As if he also used human emotions as a weapon. This type of complete and utter control of ones body was completely foreign to you. And although you would never admit it out loud, it was scary.

'This can't be good for him' you thought yo yourself as you scurried to his side and linked your arm with his once again.

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You were greeted by a short, old doorman dressed in what seemed to be a butlers uniform as you were about to enter the reception. "Mr and Mrs Chiassino, so glad made it. Mr Lavallee is going to be thrilled!" He offered as he ticked our names off of what seemed to be a guest list. "Of course, Mr Lavallee has been a huge asset and investor in our company, this is the least I could do!" Illumi, or 'Mr Chiassino', responded in a tone fit for a corrupt businessman. The real Mr and Mrs Chiassino were assassinated last week as a result of a mission assigned to the Zoldycks. Of course, this was not public information yet. As far as anybody else knew, Mr and Mrs Chiassino were attending this party right now, alive and well. You offered the doorman the best smile you could as he paid you a compliment and left you alone to attend to other guests, still entering.

As soon as you entered the hall, you were greeted with a bright lights, a huge dance floor with guests scattered around socialising with one another. Round crystal chandeliers hung from every corner of the room, illuminating  reception. Waiters walked around with trays of golden champagne. On the far right was a huge bar, almost all of the stools were occupied by men and women from different places. Surrounding the dance floor were large, beautifully decorated, round dining tables, with at least 6 seats on each table. Directly in the centre of the room, right in front of the dance floor, was a grande, yet empty stage. Amongst the murmurs and the clanking of the glasses around you, a few other guests greeted you both. Some stopping for a handshake for Illumi and a kiss on the cheek for you.

Around every corner of the room and on the second floor balconies the surrounded the hall, stood heavily armed men dressed in plain black suits, each with a small earpiece. 238 of them to be exact. This did not include all the other guests that had bought along their personal bodyguards. "There are roughly 359 armed guards", you mumbled to Illumi whike smiling at an older lady that greeted you from far.

"I know", he muttered back. "I was not waiting on you to inform me of that".

You couldn't believe the nerve of this asshole, you knew for a fact that he was not paying attention to guards as he nearly bumped into one a few moments ago. But if he wants to pretend that he can do this by himself or that your'e just getting in the way then you will show him.

You spent the next hour or so socialising with other guests under your new disguise as 'Mrs Chiassino". Unlike Illumi, you could not change your physical appearance to clone another person, so the only reason you managed to get away with this was because no one knew what Mrs Chiassino looked like. The 'couple' was newlywed. If you could even call it that. The girl Mr Chiassino married was young, very young. Your target, Mr Lavallee, was a sex trafficker after all. And what business would Ioan Lavallee have with a sex trafficker if it wasn't, well, sex trafficking. So when we found out that they were supposed to be attending this party before they were assassinated, it gave us the perfect opportunity to infiltrate without raising any suspicions. 

Your thoughts were interrupted as all the lights were dimmed except for the one on the stage, bringing everyones conversations to a halt and their attention towards it. A few moments later, Ioan Lavallee climbed onto the stage holding a golden microphone. "Good evening ladies and gentlemen!", he started. "I would like to start off by welcoming you all and thanking you for clearing out your schedules to celebrate 40 years of our business together!" Your attention shifted away from his as you felt Illumi nudge you.

"I'm going to go inform Milluki that we may be executing this a little earlier than expected, don't do anything until I'm back"", He whispered to you, his eyes still on the stage. As much as you hated to admit it, he was right. Now that Ioan Lavallee had greeted most of his guests before the speech, the attention won't be all on him once the 'main event' starts. You gave illumi a brief nod before he silently walked toward the washroom, using the darkness of the room and the fact that everyones attention was diverted to his advantage. You, however, are going to do this with, or without him. Knock him off of his high horse so that he won't look down upon you anymore.

"And now please enjoy the rest of the night as we get ready for the main event!", he exclaimed loudly before walking off stage. The room was filled with claps and cheers and very quickly, everyone turned back socialising with one another. You looked around, expecting Illumi to be back by now. Perhaps he was talking to other guests. As you were about to go and look for him, you heard someone calling out to you. "Mrs Chiassino!" you turned around as Ioan Lavallee came in to greet you with a kiss on both cheeks. You tried not to let the disgust show on your face as you offered him a smile. "Oh what a surprise, Mr Lavallee. I thought i wouldn't get to see you tonight. I must say, this is a beautiful party you've organised here.", you replied. "Well not nearly as beautiful as you are darling", he said in a suggestive manner, not trying to hide his lustful gaze as it trailed up and down your body. You forced put a small giggle at his compliment, "why, thank you! I must say, I cannot wait for the main event to start. Everyone has been talking about it since we arrived", you said as you rubbed your empty hand over his arm, never once breaking eye contact with him.

He seemed to interpret your subtle flirting gesture as an invitation. "How about we go upstairs and I can give you early access to look through and buy any of our merchandise for tonight?". Bingo. "I would love that, Mr Lavaellee", you mustered back in the most seductive voice you could manage. If the way he was looking at you was any indication of what his plans were, he was not going to be showing you the merchandise, he was taking you upstairs because he thought he could get lucky. You both knew that he had other intentions for how you were going to be spending your time.

But so did you.

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A/N: Hey everyone, Thank you to everyone that voted lat time, it really means a lot and motivated me to write more!

This was supposed to be a two part one-shot but I felt like this chapter was a little long so I'm going to make this a three part series. I promise the next one is going to be the final part! 

And smutty ;) 

Let me know what you think and don't forget comment if you enjoyed!