Yandere!stray Kids - Tumblr Posts
The True Beast
Pairing: Gaston!Hyunjin x Belle!Reader
Genre: yandere au + beauty and the beast au
Summary: What if Gaston managed to intervene before Belle went off in search for her father?
Warnings: yandere content, dark/possessive/toxic/ abusive themes ahead, please read at your own risk
You sighed, snapping your book closed in order to glare up at the annoying man dressed in red.
“Hyunjin, enough of this. I already said I wouldn’t marry you.”
Your words came out harsher than you wanted, but you hoped that maybe this time he would actually listen to them. It was becoming exhausting to turn him down day after day. Dodging the constant flow of advances sent your way. You didn’t want him. You simply never would. He was everything you despised in a person. Cocky. Arrogant. A delusional sense of entitlement.
“I know you’re just playing hard to get, Y/n, but this game we are playing is starting to get tiresome.”
“Then take the hint,” you whispered, shaking your head before leaving him and his ego standing alone in the street.
* * *
You strolled up to your cottage near the outskirts of town, your shoes clicking against the cobblestone ground. Your eyes were fixated on the page in front of you, completely emerged in the story unfolding.
“How is it I’ve looked at you my whole, and yet it feels like I’m now finally getting to truly see you?”
The prince gripped onto her chin, tilting her head up to stare deeply into her eyes. Slowly leaning in, his eyes flickering down to her lips.
—
Without warning, your body collided with another, sending you stumbling backwards. Simultaneously letting out a surprised yelp, you snapped your eyes up from the page you were reading.
“Father?”
“Oh! I’m sorry, mon rayon de soleil, I didn’t see you coming,” your father replied, startled.
You watched as he fastened the the ropes of a carriage securely to the saddle of his horse, Philippe.
“You’re off already? I thought you weren’t leaving until tomorrow morning.”
“I wasn’t planning on leaving so soon,” he solemnly explained, “But the journey is going to be longer than I originally anticipated.”
A small pout formed on your lips, “I understand, have a safe travel, okay?”
You leaned up onto your lip toes, pressing an endearing kiss onto your father’s cheek. Turning towards Philippe, you dragged your hand across his snout.
“And you, take care of my father for me.”
* * *
The cottage was eerily silent all night without your father present. You thought you’d be use to his escapades by now, but you never really could get comfortable with the thought of him travelling alone.
Sighing, you kicked yourself out of bed.
“I can’t sit around and worry all day,” you muttered to yourself, pulling your hair back and tying a ribbon around to keep it in place.
You grabbed a small wicker basket, preparing to head to the town’s bakery. Slipping on your shoes, you exited your home, skipping down the pathway to the gate.
Suddenly, the booming sound of hooves pounding against the ground caught your attention. Whipping your head in the direction of the noise, your mouth fell agape in a silent gasp.
“P-Philippe,” you questioned, running over to the frantic horse, “Where’s your carriage? Where’s my father?”
The horse kicked out it’s leg, shattering a wooden board of the fence in half.
“You wait right here!”
You turned around, running back into your home, trying to gather up all the supplies you need to search for your the last piece of family you had left.
The door to your cottage slowly created open, only to slam shut seconds later. Halting all your movements, you carefully crept out into the conman area.
“Hello,” you called out.
Your eyes scanned around the room until they landed on a familiar man wearing obnoxiously bright red. A grin spread across his lips the moment his eyes landed on your figure. A tiny bouquets of half-wilted daisies were gripped in his hand.
Oh no, not again, you internally groaned. He sauntered up to you, successfully cornering you in the back room of your home.
“These are for you,” he happily exclaimed, holding out the pathetic grouping of flowers.
You sighed, “You know I can’t accept those.”
“Look, Y/n, you haven’t given me an honest shot-”
“I have, Hyunjin, many many times. Like I’ve said before, I am not interested.”
His eyes began to grow dark at your words, causing an anxious pit to grow in your stomach. It was almost as if something had snapped inside him. The hopeful grin was wiped off his face in seconds, leaving behind a scowl. Avoiding his gaze, you look down to the wooden floorboards.
“N-Now, I really don’t have time for this,” you mumbled, deciding to attempt pushing past the persistent man, “Something terrible has happened to my father-”
A loud yelp escaped past your lips the second a painfully tight grip wrapped itself around your arm, jerking you back to your original spot.
“I didn’t say you could leave,” he growled, tightening his grip even more.
Tears welled up in the corner of your eyes, fear and pain coursing through your body.
“Hyunjin, let go. Please. You’re hurting me,” you pleaded while desperately trying to tug your arm from his grasp.
A low chuckle erupted from Hyunjin’s chest. He pulled you in closer, colliding his lips roughly onto yours. Your hand raised up, preparing yourself to slap him, but he easily caught your wrist.
“You don’t want me,” he murmured breathlessly after pulling away.
Even though his eyes were staring intensely into yours, he sounded like he was talking to himself.
“You’re mine, why can’t you understand that!” he suddenly bellowed, causing you to flinch away.
“I-I was never—” you tried to meekly reply, but your voice was cut off by a force throwing you backwards, making you to crash down to the ground below.
You felt Hyunjin’s boot overlap onto your hand, stepping down. A sickening crack echoed throughout room. You let out a shriek of pure agony, tears now streaming uncontrollably down your cheeks.
“You don’t need anyone else but me, darling. Not your pesky father. Not anyone else in this dreadful little town.”
Removing his boot from your hand, he crouched down beside you. His own hand reached out, wiping away some stray tears that slipped down your cheeks.
“I gave you many chances not to break my heart, ma belle, but you just never took them. Looks like it’s finally my turn to break you.”
• • •
I tried to add some French petnames to make it more connected to Beauty and the Beast, but why do I feel like I butchered it😭
chemical infatuation
genre. yandere au. patient!jisung x researcher!reader
desc. jisung takes part in a high-paying yet sketchy study with seemingly no risks, but the injection causes him to quickly grow obsessed with the daytime staff member assigned to his study.
warnings. needles. vomit. murder.
wc. 3.5k
“is it a bad time to tell you that i’m a little claustrophobic?” your patient, han jisung, nervously shifted in his seat, fiddling with the hem of his sweater.
“we have to keep you in this containment during our research.“
the containment room, with its dim lighting and cushioned walls, seemed to close in on him. the dimensions felt constricting, heightening the anxiety surging through his veins.
every inch of the space was under surveillance, every move to be meticulously scrutinized by the watchful eyes of researchers.
what a sketchy situation. but it was better than he had expected from a craigslist ad that he had chanced upon.
the snap of your rubber gloves pulled him away from his thoughts, “it isn’t too late to back out, we have a few more candidates willing to take your place.”
500 million won. that was enough for him to do anything.
“i’m fine. i’m ready.”
“alright then, pull your arm out of your sweater for me.”
“i have a tank top underneath.” the boy shuffled out of the sweater and placed it onto his lap.
“and as the paperwork says, you have no allergies, anaphylaxis, or any history of mental illness?”
“nope.”
he flinched as the cool alcohol pad met his bicep.
“the medication we are testing for you should not hurt you much as far as we are concerned,” you began prepping the needle and syringe, “the only side effects that we predict could be a minor headache for a couple of days. it is not dangerous.”
jisung closed his eyes as you squeezed his arm slightly, pushing the needle through his skin.
you gently placed the gauze onto his arm, “finished. how do you feel immediately?”
“normal. a little shaken up from nerves, but no problems. what do i do now?”
“you’ll be watched for a month. the only restrictions are that you aren’t allowed to leave this room or use any devices.”
the idea of isolation and confinement weighed a bit heavily on him, but he was determined to see it through.
you motion towards the mattress in the corner, “we will change your bedding twice throughout the month. let us know if you are uncomfortable with the temperature of the room, need extra bedding, or anything else.”
jisung nodded.
“let us know if you need to use the bathroom and we will temporarily disable the cameras for your privacy. but we will take urine samples if we deem it necessary.”
“and what about food?”
“you’ll be fed three meals per day, with two snacks.”
“thank you. that’s all i need to know,” he paused for a moment, “other than your name. what’s your name?”
“y/n l/n,” you gather your paperwork, “your personal belongings will be returned once we go through to make sure there is nothing that could alter our research.”
the door had closed and locked, leaving jisung alone in the room with just his thoughts to keep him company until his stuff was given back to him.
Beginning Notes
Han Jisung (Male)
23 years old, no known medical problems
Acterenol, Administered 16:38, 5/17/25.
Intramuscular, Upper Arm
Notes: Jisung feels nervous about receiving the injection. Administered at 16:38 with no noted side effects.
you watched the boy through the array of cameras placed strategically throughout the room as he lay on the mattress. his sweater was haphazardly discarded across the room, a seemingly small attempt to make himself more comfortable in the sterile, plain environment.
despite the initial nerves of a new medication, nothing had seemed to happen. at the fifteen-minute mark, you stepped away from the cameras for a moment— if there were to be a severe sudden reaction, it would have manifested by now, you reasoned.
throughout your shift, your attention continued to drift back to the screens displaying jisung’s every move. with each glance, you found him engaged in various activities—doodling, writing in a journal, or simply staring off into space, lost in thought.
nothing seemed to go wrong. perhaps this medication would be approved.
Overnight Notes
Han Jisung (Male)
23 years old, no known medical problems
Acterenol, Administered 16:38, 5/17/25.
Intramuscular, Upper Arm
Notes: Jisung ate all of dinner and requested night snacks. He had slept well. No side effects were recorded.
you press the bright red button, lowering your mouth to the microphone.
“how is everything down there? any side effects?”
“y/n? is that you speaking?”
“yes,” you were surprised that the boy had remembered your name, “what are your symptoms?”
“you should come into the room to speak with me. i’m lonely here.”
“i have to record your symptoms. i can’t come down there unless i know that you’re stable.”
the microphone had only barely picked up his sigh. “i’m normal.”
“any headaches? dizziness? dry throat?”
“nope. nothing. everything’s fine. just lonely.”
you sigh. he seemed normal. he was lying in bed, staring up at one of the cameras.
so it was fine, right?
you push open the door, greeted by the grinning patient on his mattress.
“you smell nice. what products do you use?”
what an odd conversation starter. “nothing special. just a lavender-scented body wash.”
he nods. “the overnight staff were fine, but i think that i prefer you. i can’t put my finger on it quite yet.”
was jisung naturally this blunt with his words? or was he flirting with you?
“what do you plan to do during your stay here?”
he leans back against the cushioned wall, “i compose songs for artists. i figured that it would be easy to get a lot of work done in here.”
“i see. is that your songwriting journal then?” you eye the small black book and pen next to him.
he takes the pen into his hand, “yup. it’s one of the few things that i brought here.”
“you’ll have to show me some of your work sometime throughout the month.”
“you can look at my work now,” he grins, clicking the pen, “my name is HAN. look me up.”
the name stays in your mind as you exit the room and lock the door. you find your way back to your seat at the cameras to supervise the man, pulling your lunch out of your back.
one hand holds a sandwich as the other browses through safari, looking at the songs that your patient had composed.
you hadn’t heard any of them, but perhaps it would be a good idea to look into the lyrics. it would give you things to talk about with him for the following month.
the rest of the shift was boring. you watched as he wrote in his notebook, ate his food, hummed to himself— nothing interesting.
the most intriguing thing that you experienced was the occasional ‘help!’ button being pressed, only for the man to announce that he needed to take a piss.
your misery was ended once your coworker entered the room, placing his keys and bag down on the table.
a sigh of relief left you, “thank god. it’s so boring.”
“thanks for the warning.”
Overnight Notes
Han Jisung (Male)
23 years old, no known medical problems
Acterenol, Administered 16:38, 5/17/25.
Intramuscular, Upper Arm
Notes: Jisung ate all of dinner and requested no night snack. Awoke at 01:00 and 03:00. Specified no reason for waking. Special request for morning staff: Deliver lavender-scented body wash.
your eyes stared down at the note with slightly widened eyes.
perhaps he had good intentions, perhaps your defenses were just too high. after all, he might just like the scent of lavender like you did.
“good morning. any headaches? dizziness? dry throat?”
“my arm is a little sore, and i’m a bit restless, but that is all.”
you record his answers— finally something to write down.
“i saw your request from last night. i’ll get a staff member to deliver your body wash. did you run out? i’m sure we gave you enough.”
“i still have some. i just wanted to try yours out.”
how strange.
“you’re coming down to see me today, right?”
“not today. i want to see if your symptoms worsen throughout the day. it’s best to be careful.”
you watch through the camera as he slumps back, visibly disappointed.
today, the boy had begun to act a little bit differently. every couple of minutes, he would stop his writing to look up at the camera.
you would hold eye contact with him for a few moments, even though he couldn’t see you before he would look back down again with a large grin that wasn’t on his face before.
soon, the bottle of body wash was delivered to his room.
“y/n! is that you?” he jumped out of bed as the lock clicked, only to be disappointed to see a man in a mask and gloves leave it right inside of the door.
he crept towards the bottle, snapping the lid off, holding it up to his nose, then inhaling deeply.
“it smells like you.”
you clenched your teeth, writing down the reactions.
walking over towards the center of the room, he peeled his t-shirt off his frame, then pulled down his sweatpants and boxers in one go.
you shrieked, slamming the buttons to disable the camera.
he was supposed to tell you when he needed privacy.
with shaky hands, you began to jot down his behaviors.
once ten minutes had passed, you turned the camera back on in hopes that he was decent again. this time, you had enabled the camera with caution, only to see that he was showering.
you disable it once again and decide that this would be a good time to have lunch.
the image of the naked man was etched into your mind as you tried to force the salad down your throat.
it was a good thirty minutes until you got the courage to turn the camera back on, sighing in relief as you saw him on his bed with sweatpants on once again.
jisung stared up at the ceiling with hooded eyes, chest rising and falling— you weren’t sure what was going through his mind.
you press the button. “everything alright in there?”
he perked up, “y/n, everything is just fine. i wish you were in here, though, instead of behind that stupid camera.”
you bite your lip uncomfortably, unsure of how to respond.
changing the subject would be best.
“lunch will be delivered soon.”
“good. i’m a bit hungry.”
you take your finger off of the button, sitting back in your seat, waiting for your shift to be over.
Overnight Notes
Han Jisung (Male)
23 years old, no known medical problems
Acterenol, Administered 16:38, 5/17/25.
Intramuscular, Upper Arm
Notes: Jisung ate most of dinner and requested no night snack. Had difficulty falling and staying asleep. Awoke many times to journal. Refused conversation about his symptoms.
“y/n? you’re here, right? right?”
you had only just opened the door to the surveillance room, met with his muffled voice through the speakers.
“y/n? y/n? baby? my beautiful doll?”
the nickname caught you off guard, breath caught in your throat.
before answering, you grabbed the pen off the desk to jot down the behavior. this was not normal.
he stared directly into the camera. “i know you’re here. i journaled the minutes until he would leave and you would replace him.”
your legs shook as you took a seat.
why were you so nervous? it wasn’t like you were in danger. the door was locked. his body language did not seem hostile.
but his eyes told a different story. they were dark, crazed, restless.
“doll? can you hear me? can you hear me?”
your voice stuttered, “what are your symptoms?”
“i missed your voice, y/n.”
“any headaches? dizziness? dry throat?”
“none,” jisung answered quickly, “so you can come down and see me, right?”
you lied through your teeth. “not today. we are still a bit worried about yesterday’s symptoms.”
“fuck!” his forehead hit against the wall.
you took your finger away from the button.
he balled his hand into a fist before hurling it towards the same wall.
jisung crumbles to the floor. “i can’t take it anymore.”
“are you alright? are you in pain? do you need help?” you grasp your pen with an unsteady hand, “tell me what’s going on. talk to me.”
“i need to see you again, i waited all night just for you to tell me no.”
“it’s for the safety of you and myself.”
his voice was barely above a raspy whisper, “i promise i won’t hurt you, i’d never hurt you. i couldn’t hurt you.”
“jisung,” you started sternly, “i’m unable to see you. please abide by the rules of the study.”
“can’t i quit?”
“you signed a form stating that unless there is a medical emergency, you aren’t to leave this room. i’m quite not sure that you’re in your right state of mind right now.”
“i would be fine if you’d let me see you again.”
it was pointless to argue with the man, so you let go of the button, jotting down the conversation.
jisung did not eat, speak, or move from his spot that day.
Overnight Notes
Han Jisung (Male)
23 years old, no known medical problems
Acterenol, Administered 16:38, 5/17/25.
Intramuscular, Upper Arm
Notes: Jisung ate no dinner and requested no night snack. Did not sleep through the night. Refused conversation.
“doll, you’re back.” his raspy voice announced your presence just as you opened the door as if he was in the room with you.
on the camera, he was spread out in the middle of the floor like a starfish. his blonde hair covered his face, but you could still see the eye bags forming under his sunken eyes.
“i have a bit of a headache. i’m dizzy. my throat is dry,” he answered your questions for you, “will i get to see you today, doll?”
you were a bit afraid to answer, hesitating as you pressed the button, “i’m sorry. no.”
“but i will be able to see you after the study, right? after the study you’ll marry me, right?”
your heart dropped into your stomach at the words.
“i have a partner, jisung.”
“i know,” he smiled lightly, “it’s me. but soon i’ll be your husband, right?”
this was too much. you felt sick. you needed to alert the rest of the team and let someone else take over this case. hell, you might even quit your job.
“imagine you as han y/n. it sounds beautiful, doesn’t it?”
his crazed voice rang through your ears as you stood up from your seat.
“nobody else has ever made me feel this way, do you know that? all i want is you. and i’ve only seen you twice. isn’t that absurd? love is just so beautiful.”
his words caused you to still. you felt like a deer in headlights.
“do you think the shot is what made me crazy? because ever since we met eyes after you gave it to me, i couldn’t stop thinking about you. about your touch, even through the gloves. all of my songs have been about you. i even drew you.”
waves of nausea came crashing down on you.
“i can’t wait until i’m finally out of here. i can finally have you all to myself. i’ll kill that night staff for taking you away from me.”
jisung scoffed at the thought of him, “and he’s the one who gets the pleasure of passing by you every day? do you like him? i’ll gouge his eyes out and wear his skin if you like him more than me, hm?”
you raced towards the trash can in the corner of the room, stomach churning as your breakfast came right out of your mouth.
the smell was putrid, acidic, disgusting. but not as disgusting as the words of the sick man behind the camera.
“did you watch me shower, my love? i don’t mind if you did. your lavender body wash felt so good on my body, i imagined it was you in there with me, washing my body yourself—“
you ran out of the room, slamming the door behind you.
“he’s crazy! he’s gone mad!” you point towards the surveillance room, tears streaming down your face as you try to explain the situation to the nearest person that you can find.
“calm down. go to the break room. i’ll alert the rest and we’ll handle it.”
“you’ll be okay,” a staff member reassures, handing you a much-needed drink from the vending machine, “he won’t be able to escape. we will detain him and try to get him any help that we can.”
“even aside from how creepy he was, i just feel terrible, you know? i gave him that shot.”
“it isn’t your fault. he knew what he was getting into. we tried our best to determine the effects. there was no way of knowing.”
although he was right, guilt and horror still ate you up as you rested your head in your hands.
“this is why our job is important, so that only one person gets hurt instead of an entire population of people.”
“what a shitty job.”
he laughed as he got up, “tell me about it. i’m gonna go see what i can do to help. let us know if you need anything.”
the door closes and you lay your head down on the table, closing your eyes.
all you could think about was the man and his words.
‘i can’t wait until i’m finally out of here. i can finally have you all to myself. i’ll kill that night staff for taking you away from me.’
would he be able to leave? would he be able to get over this love sickness? is it reversible? nobody knew anything about it. the only thing that could be done is watching him.
it only seemed to get worse over the days, and you didn’t want to know what he would be like at the end of the month.
Overnight Notes
Han Jisung (Male)
23 years old, psychosis
Acterenol, Administered 16:38, 5/17/25.
Intramuscular, Upper Arm
Notes: Jisung ate no dinner and requested no night snack. Did not sleep through the night. Refused conversation aside from asking for previous staff, Y/N L/N.
you no longer worked with jisung. instead, you had been assigned to a new case.
“it isn’t too late to back out, we have a few more candidates willing to take your place.”
“i’m not nervous. go ahead and inject me, doctor,” the patient joked, pulling her sleeve up.
“and as the paperwork says, your only allergy is mild reaction to shellfish, but no anaphylaxis or any history of mental illness?”
“all correct.”
you were wiping her bicep with alcohol when the door had opened, screams piercing your ears from outside of the soundproof room.
“y/n?”
blood dripped onto the floor from his heaving form, eyes bloodshot and locked right on your form. in his hand, he held a loaded handgun, the smell of gun powder seeping into the room.
the patient in front of you screeched, immediately making a run for it before her brains were splattered across the room.
your ears rung from the shot, standing stalk still as jisung approached you.
everything was moving too quickly. you couldn’t process a single thing. your head was spinning. you needed to survive.
“please, i’ll do anything, don’t hurt me.”
“i told you. i won’t hurt you, i’d never hurt you. i couldn’t hurt you.” a bloody hand ran through your hair, taking advantage of your frozen figure.
“i can’t believe i’m so close to you right now.” his nose buried into your neck and you could feel the cold metal of the gun pressing against your back.
“they’re all dead. and you’re back.”
he dropped the gun to the floor, fishing through his pocket.
before you could register what was happening, jisung had already lodged a needle into your arm.
“sleep tight, my doll, i’ll get us out of here.”