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runariya · 3 months ago

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🥸🪄🤫

Merman JK who placed a courting offer on a rock for a potential mate and human reader takes it. She also goes willingly to the mating cove not knowing JK prepared it for their mating. JK's yandere show at the end when the reader tries to leave him after 🤫

Note: JK wasn't really yandere for reader unti the end. He really just want a mate but because reader took his courting offer, she's it for him.

Thank u soo much for accepting reqs! And u write so fast how do u do that? Your writing is also marvelous!

(yandere+fantasy+smut) part of the prompt game pairing: merman!Jungkook x human!female reader genre: fantasy!AU, S2"L", yandere, merman!AU, dark romance warnings: oblivious reader, fluff, language barrier (merman-language is italic and blue), smut, a little bit of fingering, big cock JK similar to the shape of a whale idk man..., unprotected sex, multiple orgasms, panic, realisation, yandere, lmk if I forgot smth (still hate writing warnings) word count: 3.375

a/n: aaaah thanks a lot for your lovely words anony! I hope it turned out just as you imagined it 💕

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The ocean is beautiful.

You remember a film once, where the male lead whispered that the moon is beautiful as a stand-in for "I love you," but for you, it's always been the ocean. The sea is your love. The scent of briny air, the soothing rhythm of waves unfurling endlessly against the shore, the gentle nibbling of curious fish as they dart around you in the cool, embracing water—all of it anchors you, providing solace in moments of sadness or joy alike. It's what love feels like, or at least what love should feel like, wrapping itself around your soul, calming yet oh so profound.

You always marvel at the depths of the sea that stretch out before you, boundless and mysterious, and yet infinitely captivating. Sometimes, in those quiet moments when the world recedes and you find yourself alone, you long not just to stand as an admirer of its splendour, but to be one with this vast and enigmatic force of nature.

And so, as you walk along the shoreline, as you do almost every day, your bare feet sinking into the warmth of the sand, you're taken aback when you stumble upon a bracelet resting on the stone where you so often sit to gaze at the waves. It appears pristine, otherworldly, with pearls and shells glistening in violet hues beneath the afternoon sun, a beauty far too rare to be discarded by chance on a lonely shore like this.

Your fingers trace its entchanting form, marvelling at the craftsmanship—the smoothness, the intricacy, though curiously lacking any engraving. You glance around, noting the empty expanse of the beach, and let your eyes wander across the vast waters; there is no one else here. The bracelet appears to be yours now by some strange serendipity, still, you hesitate for a moment, torn between leaving it behind and taking it with you, a part of you reluctant at the thought of it being swept away by the tide or snatched by a passing gull. In the end, you slip it over your wrist. But it doesn’t fit—too loose, and as you allow your hand to tilt, it falls away.

You frown, perhaps the universe is nudging you to let it go. But then, as you glance at the bracelet, now nestled near your foot, it occurs to you that perhaps it's meant to be worn as an anklet instead. That makes sense, and so, convinced by this thought, you sit down upon your stone and fasten the jewellery around your ankle. It fits perfectly now, shimmering with a quiet elegance in the sunlight. And as you lean back, stretching your arms behind you, allowing the coolness of the water to caress the tips of your toes, you know that it is, without a doubt, a beautiful day, and this small discovery seems to elevate it to something extraordinary.

It’s not long after when, suddenly, something stirs the stillness of the moment. You sit up straight, eyes wide, as not far from you, without so much as a splash or ripple, a human head breaks the surface of the water. Instinctively, you pull your feet close, nerves bristling slightly from the scare. “C-can I help you?”

But the man remains silent, drifting in the water, and as you squint against the sunlight to study him more closely, you spot what seem to be scales glistening on the back of his neck. Your mouth falls open in an instant—this can't be real. Yet here he is, a creature from tales of mermaids and mermen you once dismissed as fanciful myths. And here you are, unable to tear your gaze from his face, dark wet hair framing features both familiar and otherworldly, his violet-tinted eyes locking onto yours that sends a strange thrill through your veins. His smile, too, is not quite human but not wholly alien either, a delicate balance of sharpness and charm you think.

“Wow,” you breathe, unable to conceal your awe, the astonishment spreading across your face in a grin of its own. He moves then, slowly, swimming a little farther away, and you feel a pang of disappointment, a pout forming unbidden on your lips. But just as quickly, he beckons you to follow, his gesture smooth and inviting as he stays near the shore.

Without a second thought, excitement bubbles up within you and you spring to your feet, hastily dusting the sand from your dress as you jog alongside him, eyes transfixed by the way his body moves through the water with such fluid grace. His tail—large, powerful—propels him effortlessly, and you're left torn between admiring his handsome face and the hypnotic sway of his tail. He makes it look so easy, this gliding through water, while you're struggling to keep pace, panting and stumbling to catch up with him.

Soon, you find yourself before the entrance of a vast cave, its shadowy maw framed by a path of few smooth, small stones that allows you to cross where he has already vanished beneath the surface. Nothing would have prepared you of what you’re met inside. The cave is nothing short of paradise—sunbeams slanting through narrow crevices, casting a thousand reflections on the water’s surface, turning the space into a living kaleidoscope, while droplets of condensation plop gently from the stone ceiling, adding their own melody to the serene ambiance.

The merman is there, resting near a platform, still smiling that beguiling smile, making you approach slowly, leaving a respectful distance between you as you settle yourself against the cool stone wall. “It’s so beautiful,” you whisper, your voice hushed in the face of such breathtaking beauty.

He regards you warmly, then speaks in a language that dances on your ears like music, though you can’t understand it. Still, there’s an unmistakable sense of warmth in his tone. “I hoped you would accept my courting offer.”

You smile, pointing to yourself. “I’m ___,” you say simply, hoping the meaning translates through gesture.

He nods, understanding the basics of this exchange, replying, “Mate.”

Thinking he’s simply stating that you’re human, you enthusiastically reply, “Yes! ___ mate. And you?” You point towards him right after.

His expression brightens once more. “Jungkook mate,” he responds, nodding firmly.

It takes you a moment, puzzling over his words, and then the realisation dawns on you—he doesn’t mean ‘human’. He means ‘friend’. Of course! A wave of happiness washes over you at this revelation, more than happy to be friends with him. “Yes! ___ mate, Jungkook mate,” you repeat, beaming.

His eyes glisten even more at your response, and you can’t help but smile back, the sheer magnetism of his presence holding you in its thrall. It’s as if he’s cast a spell over you, drawing you into his world, his realm. But the moment is soon broken by the buzz of your phone, vibrating in the pocket of your dress, reminding you of your upcoming dentist appointment. Regretfully, you rise to your feet, an apologetic smile on your lips as you back towards the cave’s entrance.

Jungkook looks visibly disappointed, or so you think, as his brows are furrowing ever so slightly, though his expression is still one you're learning to decipher.

“I have to go,” you say softly, “but I promise I’ll be back tomorrow.” You gesture as you speak, hoping he might understand. “___ mate, Jungkook mate. Tomorrow, sun down, sun up, I here.” You gesture dramatically to emphasise your words, and to your relief, his features soften, his nod of understanding clear.

With one last glance at him, you turn and make your way back out into the light, already counting down the hours until you return.

🌊

And so, seven days drift by, each one seeing you return to the cave, where Jungkook awaits with that silent patience of his, the two of you growing ever closer, your understanding of him deepening with each shared glance, each exchange of words. With every moment together, the awkwardness ebbs away, replaced by a gentle ease, as if you’re learning to interpret the language of his quiet gestures, his lilting voice that carries meanings beyond the reach of words.

It’s on the eighth day, after you’ve spent enough time together to almost convince yourself that you can read the currents of his mind, that something shifts between you. The anklet around your ankle, the one you now realise must have been crafted by Jungkook’s own hands, seems to have inspired you to gift him something as well.

“Kook?” you call softly as you step into the cool shade of the cave once more, a bracelet for Jungkook clutched in your palm, something you’ve carefully chosen, a small token of gratitude for all he has given you. You shouldn’t have called out, though, for there he is, as always, waiting by the platform, his strong arms draped languidly over the stone, his face splitting into a wide smile the moment he sees you.

“Mate!” he calls in return, the word making your heart twist in a way you shouldn’t feel. He means friend—but the taste of it is bittersweet now, the small seed of longing inside you growing with each encounter, but you push it aside.

“I’ve got something for you,” you announce quietly, lowering yourself to sit before him, close enough to feel the cool mist of water from his skin as his hand instinctively reaches out, resting lightly on your legs, as if needing to sate his curiosity for your strange, warm softness. You take his hand in yours—his skin wet, cold beneath your touch—and fasten the bracelet around his wrist. It’s titanium, chosen for its strength, its resilience against the sea, knowing it will last, just as you hope this tenuous connection between you will endure. “A courtship gift,” you murmur, the words familiar now—he used them himself every time he pointed at your anklet.

Jungkook stares at the bracelet, turning his arm this way and that, admiring it from every angle, his eyes shimmering with unshed tears. He whispers the word that has become his tether to you: “Mate.” His voice is soft, reverent, as if the gift means far more to him than you had imagined, and his gaze, filled with such raw affection, causes a flush to rise to your cheeks, a smile tugging at your lips at his sentimental reaction.

But then, before you can make sense of it, his hands cup your face with a suddenness that takes your breath away, and his lips press forcefully against yours. The kiss is so unexpected, his pull so swift and sure that you lose your balance, your arms flailing before they instinctively loop around his neck as you tumble into the water.

He holds you effortlessly, keeping you afloat as his lips claim yours again and again, his cold mouth moving over yours with an intensity that blinds you to the cold water. You had wondered, more times than you’d care to admit, what he might taste like—whether the salt of the sea would be a part of him—but reality is sweeter than fantasy. There is a hint of salt, yes, but beneath it lies something sweet, something intoxicating, that makes you crave more as his tongue slides against yours.

His hands roam your body, sliding over the wet fabric of your dress, exploring with a curiosity that borders on obsession. His fingers press into your skin, kneading the softness of your breasts as his breath grows heavier, more laboured. You can’t help but let your hands wander in turn, feeling the smoothness of his scales beneath your fingertips, the hard muscles that ripple beneath his skin, as solid as the stone walls of the cave.

When you finally pull away, gasping for much needed air, your eyes meet his, and up close, they are even more mesmerising—violet speckled with flecks of black and blue, like galaxies swirling in the depths of his irises, and you reach up to touch his face, tracing the lines of his cheekbones, his lips slightly swollen from the intensity of the kiss, and you imagine your own must look much the same.

Your peaceful moment is shattered when something thick and solid brushes against your thigh beneath the water, and with a startled shriek, you push away from Jungkook, not sure if your heart starts racing or stops altogether. But his arms tighten around you, keeping you from sinking beneath the surface, his expression shifting to one of sadness as he realises he’s frightened you. The panic ebbs as quickly as it came, replaced by a curious calm as you peer down into the water, trying to catch a glimpse of whatever had startled you.

“Oh,” you exclaim softly, your surprise evident as you realise it wasn’t some sea creature that had brushed against you, but rather, something that extends from Jungkook’s tail. And again, you’re not sure if your heart starts racing or stops, when you realise what it is. “Oh!”

His arousal is unmistakable—large, thick, and utterly unlike anything you’ve ever seen, more like that of a whale than a man, and you swallow dryly as you force your gaze back to Jungkook’s face. He watches you intently, waiting for your reaction, his expression unreadable but his eyes filled with an intensity that sets your skin aflame despite the chill of the water and his skin.

A deep heat begins to pool within you, your body responding to the sight of him, the proof of his desire for you undeniable. It would be a lie to say you aren’t tempted—to say he doesn’t stir something similar within you, something that makes your skin prickle and lungs work overtime. The wetness gathering between your thighs is evidence enough of that.

“Are you sure?” you murmur, your voice still echoing in the cave, your gaze searching his as if hoping he’ll understand the question without needing words. And perhaps he does, for his eyes darken with something unmistakable—an answer, a promise—before he nods, pulling you closer once more.

His lips find yours again, kissing you with a hunger that speaks of deep, aching need, his teeth grazing your skin, his rough tongue lapping at your lips, your neck, as though he can never get enough of your taste. You lose yourself to it, the world melting to nothing but the feel of his mouth on yours, his hands on your body, the heat of his desire coursing through you like a you imagined devotion would feel like.

You help him rid yourself of the soaked fabric of your underwear, Jungkook’s hands exploring your thighs with barely concealed curiosity before his fingers find the sensitive skin of your cunt, teasing your clit until soft moans escape your lips, your grip on his shoulders tightening without much thought.

But you pull his hand away, knowing the water will only wash away your arousal, leaving you wanting. Instead, you reach for him, your small hand wrapping around the thickness of his cock, marvelling at its size, the way it seems to pulse beneath your touch. Jungkook groans silently, his eyes never leaving yours as you guide him towards your entrance, the size of him daunting but the ache of desire overpowering any trepidation.

You take him slowly, gasping as he stretches you wide, the burn too much at first but quickly giving way to a deep, overwhelming pleasure as he begins to move inside you with the little bit of his cock that fits, each thrust sending sparks flying behind your pupils. He holds your legs tight, forcing your thighs together around the remaining part, the friction equally becoming almost unbearable for you, his cock filling you to the brim, and before you even realise it, you’re crying out his name, your body trembling as wave after wave of pleasure crashes over you.

Jungkook doesn’t stop, doesn’t slow, his movements relentless as he fucks you with abandon, whispering words in his strange tongue, words you don’t understand but that seem to echo with a raw, untamed passion that makes your heart race all the faster, imagining he’s praising you, thinking that you’re such a good girl for him.

You lose track of time, of the number of times he makes you cum on his cock, your mind a haze of bliss, his name the only thing you can remember to say. Each time you think you’ve reached your limit, he pulls another climax from you, his cock hitting every sensitive spot inside you with devastating accuracy, his low groans and moans clouding your mind even more.

Finally, you feel him tense, his body shuddering against yours as he buries himself as deep inside you as your physique allows, his release coming in thick, powerful pulses that fill you to the point of bursting. The sensation sends you spiralling into yet another orgasm, your body trembling uncontrollably, your mouth parting without a sound, as pleasure consumes you yet again.

When at last Jungkook pulls back, placing you gently on the platform, you collapse against the cool stone, utterly spent. It takes all your effort for the world to slowly come back into focus—the soft hues of the cave ceiling, the gentle lapping of the waves, the quiet drip of water from the ceiling above.

You lie there, breathless, your mind racing with a thousand thoughts, like the restless waves outside the cave, wondering what you’ve just done, what it means, and whether you’ll ever be able to return to the life you knew before.

But your mind can’t settle.

The realisation of your stupidity and naivety crashes over you in waves—the impossible reality of sharing yourself with a creature of myth, the deep-seated regret that gnaws at you like a tide pulling at the shore, whispering that this was a mistake, that you should have known better, should have resisted.

You find yourself wondering absurdities—whether a morning-after pill could possibly work against the seed of a merman, or if his essence would simply fade away inside you like mist, dissolving with the salt water, leaving no trace behind. Your body feels foreign, strange now, as if you've been altered by his touch, by the unearthly pleasure that coursed through you, and an instinctive panic rises, setting your nerves alight, urging you to flee.

Your limbs still tremble from all the orgasms as you push yourself upright, hands unsteady as you try to find your balance, desperate to extricate yourself from the surreal haze that envelops you. Jungkook is still there, watching you with those mesmerising eyes, his fingers gently tracing aimless patterns along your exposed thigh, as if nothing in the world could be more captivating than the feel of your skin beneath his touch. His gaze is so tender, so filled with awe, that it only deepens the ache of guilt growing in your chest, highlighting the dangerous ground you’ve ventured onto.

You attempt to pull away, to create some distance between yourself and the fantasy you’ve allowed to take root, knowing full well that this is a world you cannot inhabit, a dream too fragile to hold in the blinding light of reality. But Jungkook’s hand is faster, catching your ankle in an instant, right above the anklet he gifted you—an innocent token that now feels like a binding chain, keeping you bound to something far beyond your understanding.

You struggle, trying to shake him off, beginning to feel more panicked than you ever been in your life, but his strength is undeniable, your efforts feeble against the power of his hold, of the very being he is.

And then, he speaks—softly, with that strange lilt of his voice, but this time, not in his tongue. The word that falls from his lips is yours. The sound of it stops your breath, chills not only the air around you but you too. And in that moment, you realise what you should have known from the beginning, what you should have seen the moment you clasped that anklet around your leg—you’ve crossed a threshold that cannot be uncrossed, a line that cannot be erased.

“Mate.”

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