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© 2026 Fanprose

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    Cover image
    PublishedMay 2, 2026
    UpdatedJun 16, 2026
    LengthOne Shot
    Wordcount3,025
    Views215
    Rating
    Mature
    Genres
    Smutfemdom
    Group
    ARTMSLOONA
    Pairings
    Female Idol(s) x Male Reader
    Idols
    Heejin (LOONA)
    One Shot

    good guess, but...

    Complete
    mossandinkMay 2, 2026

    all of your friends keep telling you to break up with your girlfriend, but you don't, because you know better than them...right?

    24

    Author's note

    written for def's femdom challenge but i forgot to submit because i mixed up the submission date!! :(( inspired by a reel i saw on insta

    “Everyone keeps saying I should dump you.”

    After a few seconds of no response, you tilt your head up to look at her. If she heard you, she's showing no indication that she did. She's still cleaning the window like she has been for the past minute or so, wiping with a cloth in one hand and a Windex spray bottle in the other.

    It takes a while before she finally asks. “Why?”

    “Because… they say you’re a vampire.”

    “And?”

    “But I know you’re not.”

    The wiping stops, she lowers her arms. She doesn’t turn to look at you, just stands there looking at the window. It doesn’t seem like she’s going to respond, so you continue.

    “I know you better than they do, Heejin. I know that the reason why you don’t go out in the morning is because you work the night shift and you're sleeping."

    She doesn’t say anything in return.

    “I know the reason why you always avoid garlic is because you don’t want to have bad breath. Which is considerate, honestly.”

    She drops the soaked cloth onto the ground, hitting the floor with a wet slap.

    "And okay, yes, I've never actually seen your reflection in the mirror, but that's because… uh, of the angle in my room?"

    The silence that follows isn't really reassuring anything for you.

    "It's a small mirror," you add quickly. "And, like, the lighting's always weird. You almost never stand in front of it too, which, now that I'm saying it out loud, is its own explanation. So it totally makes sense…"

    You clear your throat and continue, “And the whole asking for permission before coming in thing, I’ve always found it really cute! And really sweet. Like, it was a little weird when you just stood there for four minutes refusing to come in that one time I said no as a joke, but I figured you were just being —”

    The spray bottle follows the cloth, hitting the floor, this time with a louder smack. You wince and let out an embarrassing eep out of reflex, "…respectful? You were being respectful, just to an extreme degree. Which is a great quality!"

    "And, yeah, it's true that I've never seen you eat in front of me. Not once in two months. But you've also never said that you were hungry, so clearly you just — you have a small appetite, and you're also very private about it, which is completely normal, even though I don't support intentionally skipping meals but clearly you're still maintaining a very healthy —"

    You realise now that you're just talking. You stop yourself before you offend her, then start again. "The, uh… The thing about you looking young for your age… It's true that Mrs Park downstairs thought you were my younger sister, but she's also like eighty years old with eyes so bad she probably couldn't even —"

    Heejin turns around. She stares at you, expression indifferent and unreadable, as she slowly takes one step after another, inching closer to you with no particular rush. You continue with your rambling, because you're not sure what to do if you stopped.

    "And the… ah, the thing with the dog. Most dogs just don't like — some dogs are just weird about people, y'know, so it's not entirely —" She's almost face to face. Two, maybe three feet away, and close enough that you lose your train of thought completely. "… dogs are weird." You finish weakly, barely even getting the last few words out. You can practically feel her breath on your skin, ice cool where it touches you.

    She stares at you for a long while, and something in her look shifts just barely, just at the edges, like she finds you a little funny, and finds that she doesn't mind. The look sends a shiver down your spine, and suddenly your knees feel embarrassingly unsteady.

    “Those are good guesses, but…” she starts, and the indifference in her face gives way to something else, the first crack in her stoic look that you've seen since meeting her two months ago. It's something almost hungry, a hunger she isn't bothering to keep in check anymore, and somehow it's the most unsettling thing you've seen.

    “I am a vampire.”

    You blink. Her skin seems to be, somehow, even paler than usual. There’s some sort of glow around her, almost luminous as the light from the window catches her skin.

    “Okay,” you say slowly. “But like, metaphorically, right?”

    She doesn’t give you an answer, so you keep rambling, “Because people say that all the time. Like, ‘I could eat a horse!’ when they’re hungry, but they don’t actually —"

    "I wouldn't eat a horse," she says. "They aren't my preference."

    You stare at her, blinking deliberately and slowly, "…What is your preference?"

    She doesn't answer that either. Instead she reaches up and draws her fingers slowly across your collarbone, and the cold of her touch hits you so suddenly that your breath catches and you almost drop to your knees. Her fingers find the collar of your shirt and she plays with it, before moving it aside, her eyes dropping to your neck. The focus in them has shifted, even you can tell, because they look like they've sharpened into something fixed and singular, like everything in the room has stopped existing, apart from you.

    Her hungry look morphs into a slow smile, and for the first time since you've known her, you get a good look at her teeth.

    Huh. You never noticed that her canines were so sharp.

    "Hold up, are those fang—"

    She cuts you off with a kiss.

    Except you can’t really call it that. For one, it’s not on your lips. The second thing is that she’s really only just placing her lips onto your skin. On your neck.

    Then her fangs sink in.

    The pain shoots through you, sharp and invasive, a puncture that's making your body scream in protest. But threading through it, impossibly, is a wave of pleasure. A deep and pulling ache that feels like the core of your being getting drawn out through the single point on your neck. Her lips are sealed air tight like a vacuum against your skin, cold and firm.

    And you can feel her sucking. You can feel the rhythmic, gentle suction as she drinks and feasts on your blood. Your knees finally give out, buckling against your will, but she holds you up effortlessly. One hand anchors in your hair, pulling you up, and the other wraps around your waist, pressing you against her impossibly cool body.

    Through all this, you can't find your voice. You feel yourself go limp and dazed, and your energy seeping away, rendering you completely unable to make a sound. But you're aware, utterly conscious. You don't have the strength to push her off, but somehow in the back of your mind, a part of you is saying that even if you did, you wouldn't choose to. The pain is immeasurable, yes, but the pleasure of having her hold you up by the hair with her freakish strength, the fact that she's got her arm wrapped around your waist as she's literally sucking your blood, it's sending signals down there that you're not sure you can control.

    Yes, you're getting a hard on from your girlfriend manhandling you and sucking your blood.

    You're not sure if it's the sensation of the icy pressure of her mouth on your neck, or the warm trickle of your own life flowing into her, but somehow someway, you're getting more and more turned on by the situation.

    She makes a noise. A soft, satisfied hum that vibrates against your throat. It's the most erotic thing you think you'll ever hear.

    Then she finally pulls back, her fangs sliding out with a slick, wet sound, akin to a blade being pulled out of a wound it just made. You slump down with your back against the wall, your knees completely giving up. You finally find your voice and gasp, a ragged intake of breath as the connection between her teeth and your neck breaks. A drop of blood, your blood, beads on her lower lip, and she licks it away with a slow, deliberate swipe of her tongue, and her eyes, now darker than you'd ever seen them, locking onto yours. She looks alive.

    "Still think I'm metaphorical?" she murmurs, her voice lower now, thicker.

    "Fuck," is the only thing that comes out of your mouth. Perhaps it's the fact that she just sucked away a considerable portion of the blood in your system causing your brain to malfunction, or that another large portion is going straight down to your cock and empowering your boner, or the combination of both, but now you're quite literally only thinking with your dick.

    "Fuck, am I a vampire now?"

    She laughs, unrestrained. "No honey, you'd need to drink my blood for that."

    You sigh in relief, before the whole weight of the situation hits you. Your girlfriend is a vampire. A sexy, hot, freakishly strong, dominant manhandling vampire. You can hear your friends screaming their "I told you so's" but right now, you're not even sure if this is a bad thing.

    You gather your strength and look up at her, and she's smiling. It's the same slow, hungry smile, and she steps closer, standing tall over your slumped body. She leans down slightly, pinning one hand against the wall, one on your chest, encasing you.

    "You're so sweet," she whispers, her face barely a few inches from yours. "So sweet and warm and full. I've been… restraining myself."

    Her hand goes from your chest to your neck, fingers cold and precise as she traces the bite marks. You flinch, but it's not painful. It feels more possessive, like she's claimed you with the bite, and is now deciding what to do with her food. She press down slightly, and you feel a fresh, tiny trickle of blood seeping out. She collects it on her fingertip and brings it to her mouth, sucking it clean with her eyes still locked on you.

    "You rambled so prettily," Heejin continues, her tone almost conversational. "Trying so hard to explain me. To normalise me. It was adorable," she leans in, her lips brushing against your ear, "It made me want you more." She almost purrs the last line. The sheer intimacy of it makes your stomach clench, and your heart starts to beat faster. Oh, your heart is still beating, thank god, but to you it seems like the only place it's pumping blood to is your cock as the tent in your pants grows ever more noticeable.

    Her hands find their way back to your chest, then she slides down. Over your shirt, under it. Over your stomach, until they reach down to the waistband of your pants, and she hooks them there. "They said you should dump me," she says, her breath still chilling your ear. "But I don't think you're going to do that. I think you're going to do exactly what I want."

    You manage a weak, "What…. what do you want?"

    Her fingers dip beneath the waistband, cold against your feverish skin.

    "I want you to breed me."

    The words hang in the air. You blink once. Then twice. Your mind, foggy from the bite, practically dazed from having to share the little blood left in you body with your cock, tries to process it. "You want to… breed…?"

    She doesn't answer you with words. Her hand moves, unbuttoning your pants with a swift and precise ease as she pulls them down. You're left in your boxers, your erection still pitching up a tent as she starts rubbing your length through the friction of the fabric. You feel yourself hardening more at her touch.

    "So eager for me," she purrs, her eyes still locked onto yours. You feel your cheeks heat up, and she laughs at your reaction, that same unrestrained sound you'd never heard from her before. "You want this too, don't you? What a naughty boy."

    Her other hand reaches for your shirt, ripping it apart into shreds with ease. She focuses on your chest, licking her lips before latching her teeth onto your skin. The searing pain shoots through you once again, but this time you feel less of it, instead allowing yourself to fully take in the pleasure it's bringing.

    'Fuck, I might be a masochist,' you think to yourself.

    While she's busy sucking more of your blood, her other hand finds it's way underneath your boxers. She grips your member with such an intense strength you feel like you're going to burst, and not in the orgasmic way.

    You let out a small whimper from the pain, your cockhead now slick with precum. 'Why the hell am I getting so turned on from the pain?' you think inwardly.

    "I'm so fucked up." This time the words find their way out of your mouth. Heejin comes up from sucking on your chest, her eyes finding yours and her gaze turning serious. She lets go of your shaft and you let out another involuntary whine. She smiles and cups your face with both hands, "You're not." It sounds sincere. "You're not fucked up. You're perfect. You're such an adorable, pretty boy, and you're the perfect vessel."

    She lets go of your face and starts working on your cock again, both hands this time. "Look at this, so big and hard for me. It took me such a long time to find someone like you, and you're not gonna mess this up for me. So be a good boy for mommy, okay?"

    You nod furiously; the name calling was the final straw. You can feel it. Your heart has given up on your brain, and is now diverting it's full attention on your erection. You can feel yourself letting go, and giving in to her.

    "Yes mommy."

    Heejin lets out a feral grin, fangs baring. "Just stay still and let me ride you." She stands up and rips apart her clothes with the same freakish strength, and you get a good look at just how flawlessly pale her skin looks in its entirety. The sight of her breasts, perfect and perky, only serve to fuel your hardening erection.

    She leans back down and straddles your hip, your cock now resting between her thighs. It jerks wildly at the touch of her cool skin, and she can't help but laugh. "My, you're so eager for me, aren't you? You're so pathetically helpless, so needy for mommy's pussy, huh?" You feel your precum leaking down your shaft as it twitches with every word she says.

    "Shoot lots of your cum into me. Give me your seed, and you can make mommy happy." She lines up with the tip of your dick, and slams down hard. The force feels enough to shatter all the bones in your body, and yet you couldn't care less. All you're thinking is the fact that your girlfriend just told you to breed her, how she somehow feels warm and slick even though her skin is icy cold, and how fucking good it feels to be inside Jeon Heejin.

    She starts riding you wildly, her hands reaching to cup your face again, her forehead pressing against yours. You keep letting out these involuntary sounds, lewd, soft noises that you can't control.

    "Can you feel how wet I am for you? God, you're so big, stretching mommy's cunt just right." Her voice is no louder than a whisper. "You're gonna give me the best babies, aren't you? Adorable little mixed breeds, half human half vampire. They'll be strong like me, and cute just like you, won't they?" You nod in response. Her tightness is griping you like a vice, and the warmth only elevates the sensation. She's riding your cock, the smacks of the flesh on her ample ass meeting your hips resonating through the walls. You try to reach and grab her waist, but she stops you before you can, wrapping her hand around yours like a handcuff, the other still resting on your cheek.

    "No touching, mommy's the one in control." She shakes her head at you, and she's showing no signs of stopping. You whimper pathetically, and try to thrust your hips up to meet her.

    "Don't. Let mommy do all the work." She hasn't even broken a sweat. You, on the other hand, you're panting and sweating like a dog, the pure sensation of her velvety walls sliding up and down on your cock combined with the heat of her cunt proving to be too much for you.

    "M-mommy, I-I'm close." You can barely get your words out, your cock throbbing inside her. You can feel her start to ride harder, rolling her hips every time she comes back down, her perky tits swaying every time she does, almost hypnotically. "Cum inside me, baby. Let it all out. Be a good boy and breed me." The bounces come to a halt, her pussy clenches tightly around your throbbing member.

    Before long, you feel it coming. You explode with thick, heavy spurts of cum, groaning as you empty wave after wave of your seed into her.

    Heejin lets go of your hands and leans back in, this time kissing you with a renewed vigour, like the fact that you're breeding her is fuelling her with joy. "You did such a good job, baby. Shoot your baby batter into my pussy. Make me a mommy, honey," she says as she parts away.

    You feel the last bit of cum leak out, your cock still in her cunt as she squeezes every last drop. You lean your head back, resting it against the wall, and you take everything in. Your girlfriend is a vampire. You were turned on by her sucking your blood. She said she wants to breed with you. She straddled you and rode you. You came inside her.

    "Fuck, I'm having vampire babies."

    END


    Author's note

    i think the concept of vampire heejin has definitely been done before, but when i saw the reel on insta that gave me the idea for this i was racking my brains for which idol to write and heejin just fit perfectly as a vampire. i was planning to kill two birds with one stone by writing iu instead and submit this fic for two challenges, but she just didn't fit :( also the process of writing this fic taught me something, and it’s that i’m no good at writing smut :((( it's not my proudest work might convert to a full time fluff/angst writer lol
    24

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