There's smut in the second half of this chapter, so feel free to skip if you're uncomfortable with that.
Footsteps so light that they barely made noise against the stone flooring carried the ghostly presence through the Zoldyck family mansion's underground tunnels. Neither the gloomy atmosphere nor the absolute darkness on either end of her journey disturbed the girl, as she walked with silent determination to her destination.
Coming to stop before the black, ornate door she placed a delicate hand upon the steel and pushed it open as though it weighed nothing more than paper. Once inside, she cocked her head at the sight that greeted her.
Killua, who was restrained to the ceiling by metal chains was swinging side to side from a single arm, the other hanging limply by his side in which he had obviously torn straight through the stone. He was staring straight into Milluki's eyes with an expression of pure insanity. His lips were tugged into a smile; just the tips curving upwards enough to add a sense of morbid amusement to his threatening words.
"Milluki, if you so much as touch them – I'll kill you."
His words were left hanging and as the dark-haired boy's anger quickly reached its boiling point, annoyed and frustrated at being threatened by someone so much younger than him – and in such a weak position, too! – It was enough to spike the boy's blood-pressure and so without thinking about his actions, he lifted the arm which held a single black whip.
Neither boy had noticed the extra presence in the room until a soft voice interrupted them.
"Millu…I hope you do not intend for that whip to reach its target," she spoke lowly; a threatening edge to her voice that promised painful retribution.
"Onee-san!" Milluki said in shock at her seemingly sudden arrival. That was before he began sweating, realising the precarious situation he was in at present. He swallowed, trying to think of an excuse that wouldn't implicate him even further.
The entire family recognised the twins' deranged possessiveness for Killua and Milluki was adamant on remaining far, far away from their ire. "What are you doing here?" he asked, hiding the whip behind his back.
The girl walked in, allowing the door to fall closed behind her with an echoing ring. Black eyes strayed just long enough from her precious Killu's form to land upon the first in line to claim the title of her little brother.
"Why do you think? To pick up Killu, of course."
"Ah…of course," Milluki stammered, unable to stop himself from fidgeting at the emptiness within her eyes.
Out of all his siblings, it was his sister that scared him the most. Sure, Illumi was terrifyingly adept at saying just the right thing to get Milluki sweating but Nallui…just a single blink in his direction had the boy almost panting in fear. She was an enigma, so similar to those of them that had taken after their mother and yet blessed with the striking-colouring that held pride within their family. For Milluki, his sister was a culmination of the worst traits his family had to offer. To make matters worse, he knew she cared little for him in the grand scheme of things.
"Millu, could you explain why exactly Killu is hanging from the ceiling like a common criminal?" Her words were spoken so softly, whispered like a confession, that it took a moment for the edge of killer-intent to register. When it did, Milluki opened his mouth to explain himself.
"He wanted to slap me around because I stabbed him," Killua interrupted with a smirk directed towards their brother. "So I let him. I felt bad."
"Li-ar," Nallui sang softly, a proud smirk dancing across her lips. Those black eyes usually so empty had lit up in amusement.
Killua grinned wolfishly in reply.
This. This was exactly what Milluki had meant.
Their brother had just admitted he'd felt no guilt in stabbing him on his escape – an escape he'd found out his sister had helped! – and now it was him they were laughing at? How could he believe anything else when his sister displayed her favouritism so openly? Milluki's brow twitched in anger. That frustration that he felt come to him so easily boiled beneath his skin, though, he daren't do anything about it with her so near.
Nallui was like a shark, able to detect the slightest hint of blood from miles away in order to capitalise on its prey. Milluki had developed the ability to mask his fear with anger. He'd much rather his sister belittle him with insulting remarks about 'family bonds' and 'loving siblings' than see him as expendable. Milluki had never been cut out for the assassination lifestyle or the pressures that came from being a child of the Zoldycks. However, what he lacked in physical prowess or innate talent, he made up for in a knack for surviving.
Milluki had recognised from a young age that those around him were made of sinister material; predators wearing the masks of humans and acting like they wouldn't abandon one of their own the second it was to their benefit. To be left behind in a family so tough as his was practically handing himself on a platter. Milluki did not want to be left behind. He did not want to die and so, with a steel gritting of his teeth, he tolerated his sister's blatant favouritism and hypocrisy with narrow eyes – ones he refused to admit burned in envy.
"You can let yourself down now, Killu," Nallui urged the young boy, her smile showing a little too much teeth. "Father wishes to speak to you."
Both brothers shared a look at how acidic her tone had changed when mentioning their father but decided, despite their differences and mutual hatred, to say nothing. Every Zoldyck child learned quickly of the tension between the eldest children and their parents.
They all learned it was best to simply look away.
"Okay," Killua said with a restrained shrug. He tugged one of his arms until the thick, steel chain snapped away before doing the same with the others holding both of his legs. They broke apart like weak vines and Killua landed on the stone ground with barely a sound, stretching out his sore muscles.
Milluki looked ready to say something but fortunately for him, was interrupted by a perfunctory knock. All three siblings turned to regard the door, hearing the muffled voice from behind. "I'm coming in."
The door was pushed open with none of the silence Nallui had used and in walked an old man with such strikingly light hair that it left Milluki as the sole odd one out. As usual, the man was wearing his 'One Kill Per Day' quota from around his neck.
Zeno regarded his grandchildren with a stern, though not un-kind gaze. "That's enough, Millu," he said in a low voice, the kind that demanded to be listened to. It was more than obvious where their father had inherited his commanding tone.
"But, Grandpa!" Milluki complained, feeling a little more confident in voicing his frustrations now that their grandfather was here to temper down his sister's psychopathy.
"Grandfather," Nallui greeted stiffly, though with less acidity than their father. At least with their grandfather, even the barest hint of respect could be found within her tone.
The man regarded his granddaughter with a shrewd gaze before speaking. "I believe Silva wishes to see Killu."
"Yes, he told me as I left. I am here to retrieve him."
Zeno hummed, nodding once. He looked toward Killua, who had by now removed all of the shackles from his limbs and was stood there, watching them both silently. At seeing his look, Nallui's face warmed from its frigidity and the smile she wore was genuine.
"Why don't you get the meeting with father over with before Gon arrives, hm? I believe the pretty boy and old man are alongside him," she mused with a smirk.
Killua chuckled, his eyes brightening at the mention of his new-found friends. "Really?"
"That is if Mike doesn't get to them first," she said with a smirk. "Or Canary."
Killua grinned, wider now than before, an unrestrained mirth. "Ha! Gon will manage it, just you watch!"
She hummed, purposefully not commenting her opinion on the matter. Instead, she pursed her lips. "Go see Father. I will find you before nightfall."
Killua nodded and began to leave the room with an easy-going gait, confident in his actions until he paused by the door, briefly looking back. He looked between Nallui and Zeno, opening and closing his mouth a few times before quickly disappearing behind the door and out of sight.
"Was there something dire to add?" Zeno spoke blandly.
"I believe Killu wished to ask about my punishment for allowing him to escape," she mused thoughtfully before a smile curled upon her lips. It looked entirely too pleased. "Caring for his onee-chan's well-being…Killu, you're too cute!"
Milluki took an involuntary step back, unnerved as always by the psychopathy the women in his family displayed. Meanwhile, Zeno regarded her expression with interest. He could recognise that the emotion she was displaying was genuine, a brief moment of honesty from his granddaughter who was usually so well-guarded. A girl dept at wearing masks at all times.
For it all to disappear at the merest instance of genuine affectionate from her brother. Interesting…
As always, Zeno was attentive in monitoring his grandchildren's behaviours, ensuring that none of them strayed too far from their origins. It would not do for the Zoldyck name to be soiled by the acts of its youngest generation. Most especially, the eldest of said generation.
Just like his son, Zeno was cautiously intuitive when it came to the twins. Recognising their dangerous and often volatile nature – of little concern to him, though no less a threat in the name of his legacy – Zeno watched the pair like a hawk, intent on catching them out on the slightest misdeed and smothering it before it could ignite into an uncontrollable flame.
While the taboo nature of his two eldest grandchildren's relationship was an undesirable outcome; one he had thoroughly shamed his son for – the fool should have recognised the signs of co-dependency at its earliest stages – his disappointment had become almost non-existent upon facing the reality of the situation that both twins were all the stronger for it. Not only that but by being able to form genuine emotional connections, even if only with each other, it had spoken for a greater tie to the family at large. Zeno had been hopeful for greater results.
He had been proven correct a decade later when Kikyo had birthed the fourth child to take on the family name and Zeno had witnessed first-hand the sheer love Nallui had displayed for the tiny, infant babe. Zeno had known from that moment that he needn't worry about either twin any longer. Both were easily controllable now that they had allowed themselves to fall victim to emotional sentiment.
Illumi was infatuated with his twin, intoxicated and obsessive; that was plain to see to both Zeno and Silva. Neither of them worried for rebellion with their eldest prodigy, because so long as Nallui was reigned in, so was he. As for the girl herself…well, it was as easy as keeping Killua tethered to the family. The girl doted upon the boy, and – having opened up her cold heart to someone other than her twin – subsequently the rest of her siblings. So long as they had a firm grasp upon the majority, then both twins were within their sphere of influence, as well as their significant powers and abilities.
Nallui turned to face Zeno, a pleased smile curling her lips. She looked like the cat that had gotten the cream. "If that's all, grandfather," she said delighted, looking eager to leave now that there was no reason to remain.
"You may leave, Nallu," Zeno said with a short nod her way, his eyes briefly flickering towards Milluki.
As if only just remembering his presence, Nallui turned to her other brother and smiled. It wasn't a friendly smile, at least, not to regular people, however his sister was far from normal and so the smile looked entirely too-dangerous. "Millu, my precious little brother…don't go hurting your siblings anymore, okay? Otherwise, Onee-san will have to get involved."
Milluki gulped, recognising the clear underlying threat. "O-okay," He turned his face away, not wanting to meet her stare dead-on. "Whatever."
He barely refrained from flinching when her hand settled upon his hair, brushing back loose bangs so that she could look directly into his eyes, the parody of a loving smile upon her face. "Good boy," she praised softly, and Milluki was loath to admit the effect the words had on him. "Onee-san is proud. If you're good, I'll get you that limited-edition cyber-doll you wanted, hm?"
Eyes widening slightly, the boy gazed up at his sister, unsure whether to fall for the blatant bribery. Good boy. Her words repeated inside his mind and the boy pursed his lips, frustrated at himself. No matter how many times he told himself he didn't care; that he'd made peace with being the last choice – the forgotten sibling, he seemingly couldn't escape the deep-seated need to be seen.
Good boy. Onee-san is proud.
"Really?" he muttered, trying to inject some sourness into his tone. He glanced at their grandfather, who was watching their interaction with eagle-eyes.
Nallui hummed, tugging lightly on his hair and scratching his scalp ever-so-slightly with her long nails. It felt good and the affection she was so overtly showing him caused goosebumps to rise on his skin. His hands clenched around the leather whip within his hands, unsure whether he wanted to cave in to her attentions or lash out in confused anger.
"Of course. Onee-san wouldn't lie to you," she assured in a soft, lulling hum.
"Y-yeah…" he murmured quietly.
Pulling back rather abruptly and leaving a cold breeze in her absence, Milluki watched as his sister bowed once to their grandfather before disappearing out of the room, silvery-white hair flowing behind her.
Just like that, his sister and her sweet promises left him behind, once again.
. . .
Before she met back up with Killua, Nallui decided to head towards her room and pack herself a bag of necessities. Honestly, she could survive with barely anything – as she had done during the Hunter exam, however, if she was to be looking after her little brother and his friends, then she supposed it would be beneficial to carry supplies.
Slipping inside of her shared room with her twin, which was located on one of the lowest floors of the Zoldyck mansion, guarded by a singular door obstructed by the many shadows that collected within the dreary stone corridor. The door had been shut as always, but Nallui knew even before she entered the room that she was no longer alone.
This was why, when a hand wrapped tightly around her neck she did not panic. She blinked innocently up at the face that loomed above her, a smile curling upon her lips at the familiar, empty gaze. "Illu-ni."
Illumi said nothing and Nallui pouted at his silence, feeling like she was being punished for something she could not recall. Or more appropriately, something she did not feel warranted such awful treatment from her adoring brother. "Are you mad at me? I thought you had come to terms with my upcoming trip."
He said nothing and so she pushed a little further, curious as to his appearance so soon after they'd departed. "Has your mission been postponed?" Whilst her question was valid, they both knew she cared little for the details of his work. It was obvious he was here to collect the necessary items for his mission and had decided to wait and ambush her upon arrival. She fluttered her lashes, coy. "Or are you here just to see me?"
"Get down," was all he said in reply, his voice completely monotone and lacking any of the bite she usually witnessed when he was annoyed at her actions. Nallui cocked her head to the side, as much as possible with his hand still gripping her throat tightly. "Down where, Illu-ni?"
"On your knees."
A mischievous brightness entered her eyes at his rough tone and she unconsciously darted out a pink tongue to wet her lips. She suddenly felt parched, like Illumi was the only one able to quench her sudden thirst. Her voracious urges. Biting her lips and fluttering her lashes up at him, she spoke softly, sensuously. "You'll have to let go of my neck if you want me on my knees, Onii-chan."
Nallui had been allowing his tight grip to hold up her entire weight, enjoying the way it slowly cut off her breathing – hoping it would leave behind a lovely purple remembrance of his touch – and so, when he let go of her she allowed her body to succumb to gravity, falling to the floor.
On her knees and looking up at her brother through thick white lashes, Nallui pouted. Her fingers ran delicate circles around the hem of his trousers, eager to tug them down and allow her to have her fun. She thought about the firm body hidden beneath and it only made her more eager to rip them off completely. Nallui thought it was such a pity that he even covered himself to begin with. Why must she be deprived of such a sight?
Her fingers curled into the hem and slowly pulled, her smile turning devilish as he was bared before her. She took a moment to simply admire the sight; allow the deep sense of longing and adoration she held for him to take over completely, to lull her into a more submissive, complacent mindset.
This was her brother, her precious Illu-ni and she knew, with all her heart and soul that she could let go and put her trust in him.
One hand sank into her hair, not tugging but merely cupping the back of her head whilst the other held her cheek, bringing her gaze up to meet his. Nallui smiled coyly, turning her face to press a brief kiss to the palm cupping her face. "Impatient, Illu-ni?" she murmured, moving to press another kiss to his cock. She took him in her hand and marvelled at their difference.
Her hands – so slim and bone-white – contrasted heavily against the thick, swollen member that was almost red with flushed excitement at her touch. "You know you can use me however you want. I bet you're upset I'm leaving with Killu, aren't you? Why not take that anger out on me, hm? Use me to your heart's content."
Illumi's grip in her hair tightened and she hissed in pleasure at the sting. He remained silent, though, which she could not allow. Slowly, she continued to run her hands up and down his cock, watching in satisfaction as her thumb ran along the slit, gathering the precum that threatened to spill. She popped her thumb into her mouth and closed her eyes with a low hum.
"Let me make it up to you, Illu-ni. I'll give you all of me. Does that sound good? You can take everything you want, even if I say no." She pressed her face closer to his stomach, pressing a kiss to the toned abs and smiling up at him with shining, dark eyes. "Take what you want with force like the true Zoldyck heir, hm?"
That seemed to set him off.
Nallui had only a second's notice of Illumi's intentions – recognising the way his already inky-black eyes became even darker in lust, at how her whispered words caused his stomach to clench and his cock to twitch within her hands. Her hair was yanked back and with only a moment to catch her breath, she was forced to take him entirely, lips stretched wide as she accommodated him without struggle.
Eyelashes fluttering in content, she hummed loudly, knowing the effect it would have on him. She opened her eyes to look up at Illumi; identical eyes staring down at her with an emotion similar to rapture. Ahh…how Nallui loved that look on her brother's face, one filled with such unbridled devotion; of love and acceptance and euphoric pleasure – and it was all directed at her.
Swallowing harshly and enjoying the stutter of breath he let out from parted lips, Nallui allowed herself to be man-handled around. She didn't worry, having long outgrown any kind of gag-reflex she needn't concern herself with how rough her brother was being with her. Nallui allowed Illumi to tangle those long fingers within her hair, holding her in place whilst he took his pleasure from her without sympathy. The thought of him using her so thoroughly – of simply taking what he wanted from his adoring sister – caused her stomach to clench and her thighs to unconsciously twitch. She could feel that familiar heat building within her stomach, the wetness between her legs desperate for any kind of touch.
All too suddenly she was released from his hold and blinking a couple of times, Nallui looked up at her brother with parted lips; saliva dribbling from the corners of her lips and her cheeks flushed pink. Her eyes were glassy and gave even more credence to her doll-like appearance. "Illu-ni?"
"I want to finish inside you," was all he said before those deceptively lean arms picked her up in one fell swoop. He tugged the intricately wrapped kimono from around her waist like it was nothing but paper, letting it fall to the floor carelessly. "You will let me," he commanded rather than asked, but he needn't bothered for Nallui was already nodding her head eagerly, barely refraining from begging to feel him inside of her.
Without any kind of preparation or warning, Illumi pushed himself inside, setting up a relentless pace. Her back was pushed up against the cold stone wall and the rough surface caused the bandages wrapped around her chest to tear and fall away. Illumi descended upon her bare chest like a predator on prey and his sharp teeth bit into her without mercy. She squealed and bit her lips until she tasted blood, her hands coming to clutch onto his neck to pull him closer, craving more of him. He couldn't ever be close enough; she wanted him to consume her completely, to bite and bite until there was nothing left.
She wanted him to eat her alive, to bite and tear and take, take, take until she was nothing but a crying, helpless mess – solely reliant on her brother's touch.
He continued to pound relentlessly, harsh breaths fanning against her neck as he moved his attention to the unblemished, porcelain skin. The delicate flesh stood no chance against his fervent bites and so she wasn't surprised to feel blood dripping down to pool within the jut of her collarbones, where it then stained Illumi's white skin as she pulled him even closer.
Her hands felt useless as she tried to grab onto anything that could steady her, her body rhythmically hitting the harsh stone wall with every powerful thrust. She could feel the skin of her back open up from the rough treatment but the pain barely registered from her damaged nerves and instead, all she could feel was Illumi. Illu-ni inside of her and holding her tightly. His face pressed against her neck and his scent all around her.
Illu-ni, Illu-ni, Illu-ni… she chanted it both within her mind and out loud between pleasure-filled cries.
His motions became even more erratic – a sense of animalistic drive overtaking his body as he panted harshly in her ear, whispering her name with adoration – like a prayer that she was able to make him feel so good.
"Nallu, Nallu…"
Meanwhile, Nallui felt her hands grab the air above his head uselessly, unknowingly reaching for a pair of imaginary horns – for surely if he saw her as an angel right now, answering his prayers then she could only liken him to a demon. It was the only explanation for how he managed to make her feel so good; so euphoric. She must have made a deal with the devil, exchanging her sanity and body in exchange for such undulating pleasure.
Nallui could feel her heart beating frantically within her chest, could feel her blood thrumming beneath her skin, and Illumi's heart complemented it, both of them beating perfectly in-synch. The combined sound was almost deafening as she felt a familiar tightening in her gut and as Illumi's arms wrapped around her waist in order to crush her to his chest, she was sure that she would melt right into his heat. To finally become one with him.
"Illu-ni, please, come inside me. Give me my family, Illu-ni. Please."
"Nallu – tell me." His words were seemingly vague but she knew just what he wanted her to say. Normally she would tease him for such a request but her craving for him was overpowering and so she threw her arms around his neck and pressed her lips against his ear, whispering the words she felt from the deepest part of her heart.
"You're the only one for me. I love you." She cried at his hold, feeling like she was coming apart in his crushing hold, like there was no escaping his possessive embrace. Her sight was dotting, vision becoming black at the edges. She screwed her eyes shut, watching as red danced behind her eyelids.
"I belong to you, and only you."
"Only me. You're mine," he hissed with a punishing thrust. "You can't ever escape me. Never."
Sorry for the mini-hiatus. Real-life is hard, as always. Appreciate the love this has been getting :)