THE SALTWATER THING
mermaid x reader
(warning, the mermaid is a total baddie)
"Some entries are unfinished, abandoned mid-sentence."
The boat leaves you at the shoreline with barely a word. The crew doesn’t want to stay here—no one ever does. You stand knee-deep in the surf, your research pack strapped tight against your back, the air thick with salt and a sweetness that feels… wrong. The island breathes around you, heavy with life.
You tell yourself it’s beautiful—lush jungle, flowers you’ve never catalogued, iridescent leaves flickering with colors no chlorophyll should ever hold. But you know it isn’t beauty. It’s distortion. Something in this place is bent, and everything else bends with it.
You step forward, feet sinking into the black sand. The tide froths pink where it breaks, staining the shore like diluted blood. Out at sea, you could have sworn something watched you—eyes glinting just beneath the surface—but when you blinked, it was gone.
Your hands linger on the strap of your satchel, on the journal inside. His journal. The last thing your husband left behind before he disappeared. His notes were scattered, frantic—drawings of bones that didn’t belong to any creature you’ve studied, half-written lines about “the song,” as if the word itself were dangerous to write in full.
The jungle looms ahead, vines swaying though no wind moves. You swallow, your throat dry despite the humidity. Somewhere inside that green shadow is your husband. The man who left you nothing but cryptic sketches and silence.
And yet, as you take your first step into the island’s heart, a shiver of anticipation brushes your spine—like something has been waiting for you.
____
You pitch your tent just beyond the tree line, where the jungle’s roots crawl into the sand like pale fingers. The air is alive with sounds—clicking insects, the strange thrum of unseen wings, a low hum that seems to vibrate through the earth itself. For a moment you wonder if the island is whispering, if you should be listening.
The camp feels too big without him. His side of the tent is empty, his tools absent, though his presence lingers in the most frustrating ways: the notes he left behind, smudged with seawater and sweat. You unfold his journal in the dim light of your lantern, and the pages crackle as though they resent being touched.
The sketches look hurried, desperate. A boar with tusks grown into spirals. A bird with a second beak sprouting where its throat should be. And in the margins, again and again, the same word: song.
Some entries are unfinished, abandoned mid-sentence.
You run your finger over the ink, the curve of each half-written thought. His words feel intimate, private, as though you’ve stumbled into a love letter never meant for you.
Outside, the jungle shifts. Something brushes against the canvas wall, slow and deliberate, before slipping away. You hold your breath. Then, faint and fragile, a sound rises beneath the chorus of the island: a voice, not quite human, carrying on the wind like a lullaby.
It pulls at something inside you—a chord strung tight in your chest. Your husband’s voice once had that power. But this is different. This is sharper, older, dangerously sweet.
You close the journal, but the sound doesn’t stop. It follows you into sleep, curling through your dreams.
____
Morning comes heavy, the air pressed close to your skin like a fever. You push deeper into the jungle, following the narrow impressions of boot prints—his prints, you hope—half-swallowed by moss. The canopy above bends the light into emerald shadows, every leaf too large, every vine too eager to coil.
The ground stinks of rot, sweet and metallic, and when you kneel you find bones tangled in the undergrowth. They look like pig bones at first, but the skull is wrong—elongated, tusks spiraling outward like corkscrews, eye sockets wider than they should be. Your stomach knots.
A branch cracks behind you.
You barely have time to turn before the creature lunges from the brush: a boar, but not. Its hide is stretched too tight, bristling with jagged quills where hair should be. The tusks shine wetly, twisted and split at the tips like prongs of a fork. Its eyes—milk-white, glowing faintly—fix on you as though you are already dead.
You stumble back, heart lurching, but the beast barrels forward. The ground shudders beneath its weight. You swing your pack, catching it across the snout; it squeals, high-pitched and furious, spittle spraying. You dash sideways, branches slashing your arms, breath tearing ragged from your lungs.
It charges again. Too fast.
You throw yourself behind the trunk of a massive tree, and the boar collides with it, tusks gouging deep into the bark. The impact dazes it just long enough for you to scramble up a slope of roots and lichen, blood pounding in your ears.
From somewhere beyond the trees, a melody rises—soft, lilting, almost tender. It threads into the panic, slowing your breathing even as the beast rips free and turns toward you again. For a moment, you wonder if the song is meant for you… or for the monster.
The boar freezes. Its ears twitch. Then, with a shuddering snort, it crashes back into the jungle, disappearing into shadow.
Silence drips in its wake, broken only by that voice. Sweet, alluring, impossibly sad.
And for the first time, you realize your husband might not be the only one the island has claimed.
____
The jungle presses too close, so you push back toward the ocean, stumbling through the trees until the sand opens beneath your boots. The tide is rolling in slow and heavy, carrying with it the faint shimmer of phosphorescence. Every wave seems to breathe, a living thing inhaling, exhaling.
And there it is again—the song.
It is not in your head. It drifts over the water like a ribbon of silver, haunting and tender. It weaves around your ribs until you forget the bruises on your body, the sting of scratches along your arms. It is the kind of sound that could make a person kneel in the surf and weep without knowing why.
You follow it down the shoreline, every step heavier, slower, as though the sand wants to hold you. The rocks ahead glisten, black and jagged, slick with salt. And there—half in shadow, half in light—she waits.
At first, you think she is only a woman bathing at dusk, her back bare, hair spilling in wet sheets over her shoulders. But then she turns.
Her beauty is like a knife. Skin that gleams with the sheen of pearl, eyes too large and too luminous, mouth curved in a smile both tender and cruel. Where her thighs meet the tide, you glimpse something else—scales, sleek and opalescent, shifting as though they too are listening.
The siren sings, and the air itself seems to lean toward her.
Your heart wrenches. For a single breath, you almost forget why you came here, who you are. The thought of your husband feels… distant, like a dream fading in morning light. You want only to step closer, to understand the terrible softness in her eyes.
But instinct drags your heels into the sand. You hold yourself still, trembling.
The siren tilts her head, studying you the way a predator studies prey, and her song lowers into a hush, almost a whisper. Your name seems to move in it, curled in the melody like a secret.
When you blink, she is closer, water rippling around her waist, hair drifting like seaweed. The scent of salt and sweetness fills your mouth, and you realize—she does not want to be admired. She wants you nearer.
She beckons you with a hand that gleams like wet ivory, the song still spilling from her lips in trembling ribbons. Every note presses against your chest, urging your body forward even as your mind claws backward.
The rocks are slick beneath your boots. You climb anyway, as though it would be a sin not to. When you pause, she laughs—soft, intimate, a sound meant for your ears alone.
“You came,” she says. Her voice is both a melody and a current, carrying you closer. “I knew you would.”
Her eyes catch the last of the sun, violet shadows pooling in the blue. For a terrible moment, you see yourself reflected in them—not the bruised, desperate biologist you are, but someone softer, someone beautiful enough to belong here, with her.
The tide laps higher, whispering against your calves. She leans forward, her face inches from yours, hair smelling of brine and something sweetly rotten. The song fades into words, hushed and trembling:
“You needn’t search for him. I will give you everything. The sea will give you everything.”
Her lips part as if to kiss you, but her teeth are faintly visible now—sharper than they should be. Something ancient glimmers in the line of her jaw, the edges of her scales. A predator dressed in longing.
You hold still. Your pulse hammers, your skin burns with the nearness of her. For a moment you almost want to let her—because she is beautiful, because she is here, because she fills the space your husband left.
But the part of you that is steel, the part that has dragged itself across the island despite blood and bruises, refuses.
You step back, breaking the spell like shattering glass. “I’m not what you want.”
Her expression flickers, first confusion, then rage disguised as sorrow. She reaches for you again, but this time her fingers curl like claws before she withdraws.
The siren slips into the waves without another sound, vanishing beneath the dark surface. But you hear her voice still—far below, echoing through the water like a promise.
She isn’t finished with you.
____
That night, the jungle feels alive in a way you can’t ignore. Every leaf breathes, every shadow leans toward you. You tell yourself it’s only your exhaustion—until you hear her.
The siren’s voice drifts between the trees, softer now, like a lullaby sung through water. It doesn’t command you to come, not yet. It lingers at the edge of your hearing, just enough to remind you she is near. Watching. Waiting.
When you return to your tent, something lies on the threshold: a gift. A seashell, unlike any you’ve seen, its spiral translucent, glowing faintly as though lit from within. It smells faintly of her—salt, and sweetness, and something you cannot name.
You don’t touch it. Not at first. But later, lying awake with the lantern dark, you reach for it anyway. Its edges are sharp enough to cut.
Sleep takes you unevenly. In your dreams, she kneels at your bedside, dripping seawater into the sand, her hair clinging to her face. She hums low and mournful, pressing her cheek against your chest as though she could listen to your heart forever. You do not move. You do not breathe.
When you wake, your shirt is damp.
The siren’s song follows you through the daylight, threading through bird calls, through the wind that sighs over the canopy. Once, when you stop to drink from a stream, her reflection appears beside yours in the water—eyes luminous, lips parted as though about to kiss you. The surface ripples, and she is gone.
You know now that rejecting her has not freed you. It has bound you tighter.
Somewhere on this island, your husband waits—or his bones do. And yet your thoughts drift, unbidden, not to him but to the sea. To the curve of her mouth when she smiled at you. To the promise that if you surrendered, you would never be alone again.
You shake yourself, force your legs to keep moving inland. But as you step beneath the shadowed canopy, you hear it again:
Her song.
Not calling. Not demanding.
Just whispering your name, with the devotion of a lover.
____
The jungle closes in the deeper you go. Roots coil above the soil like veins, branches twist into shapes that almost resemble hands. Every sound feels too near: the wet snap of something tearing flesh, the shriek of birds with throats that sound more human than animal.
You press on, clutching the journal against your chest, following what might be your husband’s trail—scuffs in the dirt, a torn scrap of fabric clinging to a thorn. Each sign pulls you further inland, but so does the song. Always at the edge of hearing, weaving through the horror like a silver thread.
The stench finds you first—coppery, raw. Then you see it.
A carcass sprawled across the clearing, its ribcage cracked open like a door. The thing that killed it is still there: a reptile of some kind, skin lacquered in scales that gleam oily blue, mouth split wider than it should be. Rows of teeth saw back and forth as it feeds.
It lifts its head when it hears you. The eyes are wrong—too many, and too bright.
You freeze. The song swells.
The creature lunges. You run.
Branches whip your arms, roots tear at your ankles. Its breath is hot behind you, each snap of its jaws loud enough to shake the air. You trip, fall hard, palms scraping open, and roll just as it strikes—the teeth sink into the earth inches from your ribs.
You scream, hurling a rock. Useless. The beast surges again.
And then—her voice rises. Louder now, sharp and thrumming, as if she sings only for you. The monster halts, confused, head twisting toward the sound that laces through the trees.
Your chest heaves, your lungs burn, but you feel it: her protection. Her possession. The song is not just meant to lure—it shields you, binds you, claims you.
The reptile snarls, but it does not advance. Instead, with a violent twitch, it turns and slithers back into the undergrowth, vanishing in a ripple of leaves.
The silence that follows is unbearable. You are shaking, not from the beast but from her. From the way you wanted to hear her voice, needed it, depended on it.
You stagger to your feet, clutching your chest. Somewhere ahead, your husband may still live. But it is the siren who keeps you alive.
____
The jungle finally gives way to the shore again, and you collapse into the sand, your body trembling from exhaustion and adrenaline. The salt air should clear your head, but it doesn’t. It carries her instead.
The song rises with the tide, slow and deliberate, curling around your body like a lover’s touch. Every note presses into you, into the marrow of your bones, as though she is beneath your skin now.
You clutch the journal, knuckles white, whispering your husband’s name aloud just to hear it. To remind yourself.
____
Thanks for reading ^^







