#Hey hackers | Explore Tumblr posts and blogs

lassiie · 8 days ago

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HACKER!STEPBRO HEESEUNG - TRAPPED.

The one where your antisocial stepbro pretends he's not obsessed—while secretly hacking you, jerking off to your secrets, and discovering about your desire. He’s obsessed… And you'll use it.

BEST TO READ IN DARK MODE FOR EFFECTS

CONTENT ↠ nsfw! mdni!, smut, angsty toxic Heeseung, obsessive, psychosexual dark vibes step bro Heeseung, stalker heeseung, if I can't have you no one can typpa heeseung, deep voyeurism kink, needy/pervy/manipulative reader, strong depiction of fantasies, sexual tension, consensual edging, p in the v, overstimulation, , light choking, public act, bad behavior's reader.

WORDCOUNT ↠ 9k (not proof read enough.. damn...)

Was literally obsessed with those two songs when writing this : https://open.spotify.com/intl-fr/album/4OFZVvqlg84Czl7td7XddK?si=rakigTTnSJyY8CnPyp8A7w

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Heeseung barely glanced up the first time you met.

Not when your mom introduced you, her laugh sharp and grating over the clink of designer glassware. Not when she called you her little angel, like she hadn’t spent the last decade ignoring your existence—like a piece of cloth begging to be brought back just because it’s trendy now. And definitely not when you smiled at him like you actually meant it.

He just slouched further into his hoodie—hood up, sleeves covering half his hands like armor. Said something that might’ve been “hey,” but it sounded more like: I don’t give a shit.

You smiled anyway. Quiet, composed. Like you didn’t notice he hadn’t met your eyes yet, hadn’t even registered the color of his irises. He had a good face, for sure. And a nice name. Heeseung. Hee—seung.

Let’s try not to forget it…

He’s Heeseung—the one who doesn't match the luxury flooring or manicured smiles. Heeseung, who looked more interested in his phone screen than the pricey piece of steak he’d just been served.

You—

You were different. And Heeseung noticed.

Because other girls—especially the daughters of his father’s revolving door of Stepford wives—always played the same game: almost flirty, too fake, self-obsessed, and excited to be part of the family.

You… you were calmer. Almost shy. Ashamed to even call your mom “Mom.” You were also interested in his presence—lightly tapping his foot with yours, giving him those apologetic doe eyes, like: Sorry that my shameless mom got a grip on your already-married dad just to milk him dry…

But it’s not like he divorced his mom for yours. And it’s not like you were the first one. Generally, the other step-siblings never asked about him. Never cared to know what lay beneath the hoodie-tortured-kid style he wore like armor.

You?

You looked at him like he was a person. Like you saw something he didn’t even believe was still there.

And with months—and then a year—maybe… you liked what you saw.

You asked questions. Not the fake kind. Real ones.

“You coded that game on your own?”

“You really won a national contest?”

“That glitch mechanic you added… did you write it from scratch?”

He wasn’t used to that kind of attention. Not anymore.

You leaned over his laptop one afternoon, wide-eyed, genuinely impressed. Your breath was warm on his shoulder, the scent of vanilla and soft detergent clinging to your hoodie—one he was almost sure used to be his.

“You’re kind of a genius,” you’d said, and smiled that smile. Soft. Easy. Like you weren’t afraid of him.

Because why would you be? You were always so nice and caring to him. You’d bring him a plate of food when his dad never cared to check even once. Leave Post-its with sweet pep talks before exams—ones that made him smile for the first time in a decade. Sit silently beside him after he got scolded for placing second on the honor board. Your hand, always soft and peach-scented, would stroke his hair like he wasn’t eight months older. And your eyes—so sweet when they met his.

You weren’t supposed to make him feel things.

And he wasn’t supposed to want someone like you.

But there you were. Not just prim—but infuriatingly so. You weaponized it. You made being stuck-up look like a goddamn virtue. All perfect posture and polite smiles. Still, something was off. Like how you made him open up to you, but never really talked about yourself—your life, your past. Always mysterious, always evasive when he got curious, always turning the tables on him.

You… you made him feel watched. Seen. Known.

And he didn’t like not knowing you back. Because he needed to know everything. It was pathological. Every variable that could disturb his life. Every secret.

And you—you were the unknown variable. The only one he couldn’t figure out.

And the worst part?

Heeseung couldn’t match you. He wasn’t good with people. Never had been. Getting you to open up? Never happening. He even got tense in crowds. Even if girls liked him, he couldn't maintain relationships beyond hookups. He could throw a punch, sure—but he'd rather let the other guy walk off with a smirk, too bored to bother.

But he was good at something: systems. Code. Surveillance.

So he broke the rules he’d promised himself he wouldn’t—with you.

He hacked your devices.

He shouldn’t have connected to them. Shouldn’t have hijacked your phone. Shouldn’t have hacked your webcam feed like it was just another game level to conquer.

It started innocent—ish. Really. Just some harmless digital snooping. New mother, new stepsister, weird vibes, potential threat to his peace and privacy—totally justifiable.

But your passwords were laughable. The kind of thing a middle schooler could crack.

Seriously. “Bookworm123”?

Please.

After all he was Mr. Cybersecurity Prodigy. Award-winning code monkey. VPN for his VPN, two-factor-auth god.

And he peeked. Just a little…

Your instagram private account, that your mom swore you didn’t have because “socials medias was too destructive for her future doctor of a child.”

Your spotify. Pinterest boards. You’re files.

like essays about behavioral neuroscience and a note named “journaling” : Plans. Rage. Angry rebellion written between textbook reviews. Your escape plan : college far away, control of your own life, zero influence from Barbie and her string of Stepdads. How you craved more. Your identity crisis, GPA fetishist, and how competitive you were to the point of mania. Basically, a mirror of Heeseung in the shape of someone who tried to play the hero of his narrative.

Then, it got worse.

Because curiosity became fixation. He was too deep for it not to be.

On sleepless nights, Heeseung discovered things he absolutely shouldn't.

That his straight A’s and volunteering hours stepsister — was actually sneaking off to frat party with her friends, just feel alive, get waisted and let some sophomore finger her.

The music you fall asleep to, your “fuck” playlist too — the one you wouldn’t admit to owning even under threat of death.

That habit of yours to flirt with strangers like you had a death wish or just want to be ruined so badly being jailed would be for your own good.

That you send cropped pics, no face — just enough tits and thighs, to creeps then ghost them when they beg to meet, just to feel seen.

And he knew the kind of porn you watched on school nights, after wishing him sweet dreams. Earphones on, lips between your t-shirt collar like you’re scared someone might hear you in that big mansion. And what killed him is how fucking rough it is. Spit. Hair-pulling. Throat-fucking. Girls like you weren’t supposed to want that. Girls like you were supposed to blush and look away, like when he got too close. You’re supposed to be horrified at things like that — not get off to it at 1:38 a.m.

He discovered your texts with that secret boyfriend of yours. How badly he treated you—and how you let him, just to feel owned, loved. He knew when you snuck in those late-night FaceTimes, shirt half-off, hand between your thighs, playing the loyal girlfriend for him and his pathetic dick.

And Heeseung? He was obsessed with that version of you—the one he didn’t even dare to fantasize about, yet you handed to him on a silver plate.

Your self-care sessions got him hard under his desk. Got him jerking off to the way your fingers curled around your own throat in the dim hue of your bedroom, playing at power, pretending you didn’t crave being broken open.

You were too good at pretending. Sitting across from him, blouse crisp, smiling like a poetry award was the climax of your week.

What a goddamn lie.

But at least he’d seen you now. Most of you. And he understood better. Understood your issues. But something in him snapped.

Because this wasn’t just about obsession anymore.

It wasn’t about lust.

Or even protection.

It was about you.

And how you made him feel real again.

How you gave him a purpose.

You didn’t flinch when he glared. Didn’t avoid him at dinner. You just smiled, slid him your extra fries, and asked about the AI competition like it mattered. You looked at him like he was a person.

Not a project. Not a problem.

Not a hacker. Not a delinquent.

Not some mistake his father regretted.

And that… made you dangerous.

Because now you were a necessity. Something—someone—he cared about.

He did want to protect you.

But he also wanted to own you.

To erase the line between your bedroom and his. Between your thoughts and his access. Between your gasps at night and his name.

You weren’t supposed to get close.

You weren’t supposed to care.

And he wasn’t supposed to fall for you.

Fall for you?

...

But now what ?

You were the virus in his system.

The girl who said “good job” when he didn’t ask for praise. Who laughed when no one else did. Who touched his shoulder once—just once—and left him with a twitch in his fingers he couldn’t debug.

But you were a line of code he couldn’t rewrite. A live feed he couldn’t turn off.

And maybe, if he watched long enough—if he memorized every breath, every sigh, every single unguarded look—you wouldn’t disappear like the others.

Maybe, if he learned your pattern…he could break you open before you broke him.

And maybe, just maybe, you’d want him to. Even if it meant losing something. Even if it meant pulling you into the dark with him… and never letting you go.

Now you were sitting across from him. You spare him a glance while structuring your salad like a freak, with those doe eyes and he’s hard. Hard at a family dinner while they talked business.

Suddenly his breath catches your feet touching under the table. Like questioning, you good ?

Yeah it’s me, Heeseung. That sweet voice of yours haunting his head.

His foot slides slower in between your legs mindlessly and when you almost jolt, he realizes.

“gotta go sleep.” he blurred, rushing off the table. “Tomorrow is exam day.”

Fuck, he wants more. More of your secrets.More of you—the real you.

So he turned on your webcam, night after night, and your phone’s, and tab. like you were his favorite streamer, his favorite radio mc, the best sound to sleep. Like you wanted him to fantasise, think of it every night…

You were stretched across your bed, laughing into your phone, wearing nothing but a tank and panties, circling your finger on your belly mindless. The way girls do when they forget they’re being watched.

You laid out your clothes for the next day like some little honor-roll princess—giggling when your friend called you a chaebol, and you shrug her off.

But the way you lingered on the lace you never wear… the silk you only sleep on alone… the sheer pieces he has never seen�� holding them up to your chest, slow movements like the reflection was his to tell you what to wear. It was fucking foreplay. You were a fucking siren, with your fucking hair finally down, and those dumb big scare glasses off.

And him ?

Heeseung…

He was already crashing on the rocks. He was a black-hat addict no-full-blown cyber-pervert. rock hard, mindlessly stroking his bulge at the sheer form of you in unmatched underwears.

So innocent. So mine.

Some days later, you knocked on his door while your parents were off circling the globe, allergic to stillness and obligations. Your hair was tied up but messier than usual, cheeks sun-kissed, eyes almost red—like you’d cried.

God, if someone made you cry… I’d kill them.

You held two glasses of soda, dripping with condensation. No way you could deny you’d been pacing by his door for the last hour.

“What are you up to, genius? I’m bored,” you said, voice half-curious, half-something else.

Heeseung—fool, addict, liar—let you in. Let you get too close. Showed you things he shouldn’t because you asked with that look that made him feel like a god, not a glitch. But also made him wonder who had made you sad enough to want to change your mind.

Still, you smiled at his screens like they were art. Touched his keyboard like it was sacred. No step-sister had ever looked at him like that before—hell, no one actually had. Fuck, he needed to focus. Focus on you, not you.

“You really made all this?”

He nodded, trying not to smirk, trying not to shake. His fingers danced across the keys like a seduction.

“Wanna see something fun?”

A window blinked open. He typed some commands, and grainy footage appeared: the neighbor’s yard. Middle-aged man with hedge clippers, snipping bonsai like manicuring his soul.

He tapped more keys. Suddenly, sprinklers roared to life. The neighbor shrieked, dropped the shears, and bolted.

You burst out laughing, collapsing into him, palm against his chest. That sound—reckless, sweet—made something snap inside him. It wasn’t just pride. It was possession. You weren’t weirded out. You liked it. Liked him. Not the fake polite way. The way that made him want to caress your cheek and kiss those red eyes.

But he was a coward—or your strongest soldier, as he liked to call himself. One who wanted you close, for good, not some fling you’d regret like the others he barely tolerated. No, he wanted you for life—and he was in the perfect position, as long as your parents behaved.

Then your eyes met. Dangerous idea sparking. You dared him with your gaze, then dashed out of his room.

“Try it on my bedroom camera!” you shouted, disappearing down the hall, hoodie flapping like a flag.

Fuck. If only you knew he was already connected.

Moments later — Cam03: Her Bedroom Feed lit up.

You stood in front of the lens—he used to fuck himself to thoughts of you—starry-eyed as he purposefully reactivated the red dot, signaling it was on. Made a mental note to re-enable it later.

You waved. Smiled like sin. Mouthing: “See me?”

He choked. Because yes—he saw you. Always had. But now? Now you saw him.

Like you always knew.

You reached for your top, lifted the hem just enough to flash bare skin, then darted out of frame, laughing like it was a game.

His chest burned. Panic and arousal mixed in his bloodstream like a drug. Heeseung’s brain broke.

But he didn’t shut it down. He couldn’t. Instead, he gave in. His trembling fingers dimmed your room’s lights, shifting godspeed to soft pink. He knew it was your favorite. Knew too much.

Then he started your playlist—the one with soft beats, gentle melody, moonstruck, your favorite.

You paused in the doorway. Turned just enough for the camera to catch you again. Smiled with pure fascination, like a kid. You should’ve been afraid. But you weren’t.

You looked at the cam again, really looked, like he was the sweetest boy, and you didn’t care much what he was capable of—because it was him.

You walked back to his door, dripping sunlight and mischief.

“That was so cool,” you said, high-fiving him like your heart wasn’t thundering. Like you hadn’t just exposed the darkest part of him and come back wanting more. “Can you, like… track people? Their phones or whatever?”

Heeseung blinked. “I-if their GPS is on. Or if they ping the network.”

You tilted your head. Bit your lip. “…Wanna play hide and seek?”

He scoffed in disbelief, but there was a glint behind his eyes—half challenge, half thrill. Like he’d just been dared to play a game he already knew the rules to.

He grabbed his laptop. The mansion was too big. Too full of shadows, quiet corners. A maze of marble, high ceilings, inherited guilt.

Heeseung sat somewhere, a storm brewing behind his eyes.

You texted him: “find me.” One signal. One flare. Then silence.

He tracked you through your phone GPS—chose not to use the hallway cams, even though he easily could have. Something intimate, invasive, about watching your little red dot move on his map. Every time he walked to you was an ode to the game only you two could play.

Library.

“Checkmate. You’re here.”

“Wow! So you really can!”

West Wing.

“If I’m facing a mirror, it’s too easy… not even fun.”

“Fuck…”

Wine Cellar.

“If you’re trying to get drunk, pick the 2007 Bordeaux.”

You laughed.

The pool.

He stuck to the GPS. The red dot blinking. Stalling. Then disappearing.

You texted: “find me now.”

His screen dimmed like the whole house was holding its breath.

Heeseung’s pulse quickened. GPS cut out. No new pings. He tried again. Twice. Three times. Nothing.

Every nerve in his body was a wire of curiosity. The air heavy with chlorine and humidity as he stepped toward the pool deck, leaving his computer by the bar.

Then he found it—your phone, face down on the stone near the pool.

But you, where—

“Got you!” You leapt.

Laughter, bare legs, hoodie off. Heeseung didn’t have time to react before you crashed into him—both of you tumbling into the water with a splash that shattered the silence.

You surfaced first, grinning like a devil. “You can’t find me if I don’t want you to, huh?” you teased, flicking water at him.

Heeseung stared at you, laughing mid-cough. Clothes heavy. Hair plastered to his forehead. The water clung to your skin in a way that made his hands twitch under the surface. You floated closer then. Then reached out and hooked your fingers in his bangs, stroking them like you always did. Then tugging gently.

“How about I cut your hair?” you whispered, too close to him not to have his eyes linger on your lips. “We’re starting university soon. Can’t show up like some code-goblin, right?”

He snorted. But you two didn’t move. Just watched each other's souls for too long. Heart hammering. Skin burning. You were in his pool. In his arms now. In his system.

“Are you okay?”

He, with the most considering eyes a family member ever gave you. But you just nodded to his biggest displeasure. Something was wrong, yeah.

Actually, everything was wrong. And surely something was wrong with you. You felt trapped. In your studies, in your relationship, in these always-new families, in your boring unstable life. You wanted more. More attention, more love, more recognition, more freeness, just more…

You weren't special like Heeseung. You couldn’t clap your fingers and get that video back from your so-called boyfriend—he threatened to leak it if you ever thought of leaving him again. Couldn’t clap your fingers and make a scholarship appear on your forms for university, and couldn’t clap your fingers to make you go to your best choice without the biggest loan you can think about.

But it was better to tell him everything was okay. Because if you didn't fake it… you’d be dead by now.

And maybe it’s the weather, or his concerned look, or his trembling hands on your ribs—not too low, not too high. But it felt good being with Heeseung, even better seeing the way he looked at you—you really had a problem.

“Can you… like… if I ever asked you…”

“What?” He came closer, almost locking in his hands. “Tell me…”

“If someday I needed you, would you… like… help me if I have something very complicated to solve... like… you know, math.” You laughed it off like you weren't about to ask him to get that sextape back.

He nodded so obediently it hurt. Fuck, you had him in the palm of your hand without doing anything more than just letting him watch. Deny his ever-growing desire. Playing this game you caught him in.

Yeah… maybe you really were what your mom made out of you… sadly.

After that, Heeseung was like a man on a mission. He hacked every piece of info he could find on that deep shit. Until he found it… your complicated math exercise…

A tap of you and him. Filmed like you weren’t aware of it. Heeseung couldn’t find the courage to watch it…

Until he did.

And it was everything he ever fantasized doing with you.

I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him, I’ll kill him.

That guy needed to be out of your life.

Now.

He could frame him for anything he wanted. Crash his Tesla. His mind was spiraling as he bit on his nail, replaying that video again and again and again. Zooming on you.

I’ll protect you.

First, you needed an escape. Easy—that guy already cheated on you with so many girls, it was easy for you to catch him. So he wrote a fantasy he hoped you’d fall for. He drafted messages from your bf’s phone. A fake date. Something sweet, just enough like your boyfriend to pass.

“Meet me tonight baby girl. Just us. Let’s talk. 9PM. My room.”

“Baby girl…” you hated that name, but still couldn’t refuse him. And now Heeseung understood.

You saw it, and for a second, you believed. He watched you re-read it, then start getting ready—lip gloss, that fluttery dress, even that nervous little smile like it still meant something.

Meanwhile, your boyfriend was across campus, buried in someone else. Moaning her name. Careless, as always.

Heeseung watched it all—your hope fading when you opened that door, his betrayal, his choke. Your silence. Her grasp. One earbud in, one eye on every camera feed you both could offer.

You left the place in a rush, your phone starting to buzz as Heeseung watched every message your now-ex boyfriend sent you. You found yourself drifting in a club. You needed air, music, and drinks.

The music wasn’t even that good, your drink, not that strong. You didn’t plan to dance. And you didn’t plan for some no-brain guy with smooth hands to hit on you.

And you almost let him have his way near the bathrooms. Just to forget the sound of your phone. Forget that you had to go back to that guy until he decided he’d had enough or leaked the tape.

Almost.

Until Heeseung’s hand was on your wrist, showing up out of nowhere to pull you away.

“Heeseung?”

He got you out of the club, his hand digging into your wrist. The car ride was dead silent. Heeseung looked pissed. You were hollow, but not dumb. And you let him snap.

“What the fuck were you thinking?”

You didn’t answer.

“... Don’t you have a bf?”

Still silent. Tears welled up before you could blink them back, and Heeseung was at a loss for words. Yeah, it was that easy to shush him—crocodile cries easy.

“Stop crying…” he muttered, but he looked panicked now. Like your tears were acid on his skin. “Tell me what’s going on?”

Like he didn’t know.

But you had to play it well. Make him do it tonight, and no other night.

“He cheated…”

“Then leave him…”

“I can’t…” Hee looked at you with fake wonder. “He filmed me once… and…”

He nodded, enough to tell you you didn’t need to keep going.

When you got home, Heeseung took your hand before you stormed into your room, and he watched you—really watched—and got in a hug. Caressing your hair, getting closer to your ear, “I'll help you.”

You almost feared he could feel your smile. You detached your head with the saddest questioning expression.

“I’ll protect you,” he said, the heaviest stare he ever gave you.

You just nodded like you weren’t expecting much. When you actually wanted exactly what he gave you.

Back in your room, you kept re-seeing Heeseung’s expression. Almost mad, almost dangerous.

And you. You wanted more. You wanted everything—not just protection, but revenge. Revenge for the time you lost on that guy, for your virginity you couldn’t bring back, for the stress… for everything.

So you opened your laptop. Placed your phone next to it like it’s part of the performance. You know he’s watching.

You know.

Heeseung, on his part, got in his room ready to execute the next part of his plan when the ping of your camera alerts him. But tonight is not the night. After seeing you like that, he doesn't want to do that.

So he started to undress. Until—

“Heeseung?”

His head snapped to his monitor. WTF.

“You’re here, no? I mean, you’re watching.”

He almost fell on the ground, unable to walk straight to his computer.

What? What? What? What? What? What? What? What? What? What?

The webcam light doesn’t flicker on right away when you open it.

You look at your reflection. This webcam is better than the last time you used it. Wide-angle. Pretty high-def. You can see almost your entire room. Bed. Closet. Console. The mirror angled just right to show the bathroom.

God. You made it so easy for him.

You let your fingers lazily drift to your dress straps. In a slow reveal. You watch yourself in the camera—legs tucked just right to keep mystery intact. Eyes locked on the return. You open your—

“You like it when I do that?” You looked almost innocent doing it. What the fuck were you doing, Heeseung’s mind screamed. “You want more?”

Heeseung was stunned. Too many questions. Too many desires.

He didn’t even respond, his hand mindlessly disconnecting your camera’s red dot and reconnecting again like Morse.

“Then ruin him for me. Make him as ashamed as I was.”

You were pulling his obsession like strings. A puppet master in silk cloth. The light on the webcam flickered once again.

You smiled, slowly nodding. “Good night, Heeseung.” Shut it all down.

By morning, half the campus was infected with a juicy little virus: dozens of very compromising photos of your now-ex, including a special feature of him being pegged by none other than his mom’s best friend.

Iconic.

The breakup text? Already sent. Blocked him before your brain even had a chance to process.

You didn’t see him all day. No dinner, no open door when you brought snacks. Nothing.

Maybe you really fucked up. Poor Heeseung, thinking you were innocent, only to find out you were just like everyone else—grey, messy, complicated.

But just before bed, your phone lit up. A note. Your password written clear on the screen.

You sat frozen, eyes flickering between the note that started typing on its own, and the webcam pointed right at you.

“I’ll always protect you.”

Then, an mp4 file popped up. Your lips curved into a shy smile.

You almost said something, but instead, you tapped beneath his words:

“Thank you, Heeseung. I don’t know what I’d have done if you weren’t there.”

The cursor blinked, paused—like he was thinking hard about what to say next.

“I protect what’s mine.”

Your eyes drifted to the webcam. “Am I?”

“Aren’t you?”

Your gaze dropped shyly, biting your lip to keep the smile from slipping out. Fuck, it was hot—this obsessive, protective boy who’d kill for you.

“I am…” you breathed, fingers playing with the thin straps of your dress.

“Maybe?”

Slowly, you peeled it off. No bra. No panties. Just you—bare, glowing in the soft light of your screen.

Heeseung’s side: panting mess. Trembling. Rock hard. Watching was always intense, but this? His brain shorted out. Every movement you made poured fuel on the fire in his chest—the way you loosened your hair, slid off your glasses, shy but teasing.

Your voice slipped through his headphones like a spell.

“Tell me what you want,” you breathed. “I’ll do it. As a thank you.”

He was nearly feral, watching you perched like a dream made just for him. But now you wanted him to take the lead. For once, you wanted control handed over.

And for a long, heavy moment, silence.

Then, a new line in your notes:

“Anything?”

You nodded, lips parting.

Another line.

“Touch yourself.”

“For me.”

You rose, heading for your bed.

Then:

“No. Here.”

You sat back down. Fully exposed. The chair never felt colder. The electricity on your skin was undeniable—the weight of someone watching, devouring every move.

You shivered. Something folded inside, vulnerable but not scared.

Then your screen flickered.

A video opened.

Porn.

But not just any porn. A girl like you—same frame, soft lighting. She was in a gaming chair, legs parted, cat headphones, a pink toy buzzing between her thighs. Moaning like she’d been waiting for eyes to watch.

You blinked. The message was loud and clear.

Your breath caught—not shocked, but challenged.

Back to the webcam—doe eyes, tempted. Your fingers traced lower, hips shifting, copying her exact position. Mimicry never felt so twisted.

You didn’t hesitate. Your fingers moved.

Heeseung watched like it was a live confession. Pupils dilated, chest heaving, gripping himself tight, trying not to explode too soon.

A message appeared:

“Slower.”

You obeyed, breath shaking, already slick with every stroke.

Another message:

“Fuck, you’re shaking.”

You were. Legs twitching, spine arching against the chair.

You never thought you’d go this far, but he was puppeteering you with his commands.

Then:

“I’ve never seen you like this. Fuck. I want to cum in you. In that chair. Just like that.”

You groaned, eyes fluttering shut, but forced them open—locking onto the lens like it was him.

Another message:

“I want you ruined. For anyone else. Say it.”

You moaned, fingers freezing.

“I’m yours,” you whispered.

“Say it again,” he typed.

“I’m yours, Heeseung.”

The pressure built—right at the edge—

Then:

“Stop.”

“Don’t cum.”

Your breath hitched. You froze mid-stroke, legs trembling.

Another line:

“I said stop. If anyone makes you cum tonight—it’s me.”

Your fingers hovered, shaking. The ache burned deep in your thighs, stomach taut.

But you stopped.

Because his word mattered more than your desire now.

Your screen blinked.

“Get your toy.”

You swallowed, nodded, reached into your drawer.

The vibrator was familiar—sleek, pink, faintly scented from your date-night oil. You rubbed it, coating it with your wetness, then slid it slowly inside, breath heavy.

Then the toy buzzed. Flickered. Came alive.

You gasped—he was controlling it.

Before you could say a word, it pulsed hard. Your body jerked, chair creaking beneath you. Your grip tightened on the arms as pleasure rolled through you like a whip.

“That’s it,” he typed. “Don’t touch it. Just take it.”

You moaned—too much, too fast—your body trembling, legs spreading without control. The sounds you made were filthy, desperate.

Heeseung’s fingers typed again.

“Grip the chair.”

You obeyed.

The toy buzzed harder, relentless and cruel.

“Look at the camera.”

Tears pricked, but you held his gaze—through that little glowing lens. Your thighs trembled, breath catching—

He knew.

He memorized every sound, every gasp, every twitch.

Your climax hit like an explosion—so fierce your back arched from the chair. Toes curled, lips parted in a silent cry.

If only you could hear it—the gasp, the groan, the shuddering moan from his room. Rooms apart, perfectly synced.

You collapsed back against the seat, chest heaving.

The toy powered down. The room fell silent but electric. Only the Notes app stayed open. One final line appears:

“I know your body better than anyone ever will.”

You smile, eyes rolling, calming yourself. You’re still catching your breath when your phone buzzes.

Unknown Caller.

You smirk. Answer it without hesitation.

Hee,” you whisper, lazy satisfaction dripping from your tone.

You hear him—shaky, panting, like the edge nearly broke him. “Fuck,” he groans. “Fuck… You’re so pretty. So fucking pretty. You don’t even know what you do to me.”

His voice is hoarse, frayed with restraint. You picture him—still burning from his climax, hand resting low, skin flushed.

“You drive me insane. Every breath you take, every moan...” He watches you lift your thighs, tucking yourself shyly behind them like a girl playing innocent. “It’s mine. You’re mine. Don’t you get it? I want you so bad I—fuck—I can’t even—”

You cut in softly.

“Heeseung,” you murmur, voice smooth like silk sliding over a blade. “I never said I was yours...”

Silence.

You lean in, sugar-sweet, doe eyes locked on the lens, like you don’t quite know what you’re doing.

“You think this makes me yours?”

He breathes hard. You swear you hear the tension in his throat—how he swallows that growl.

“Then what?” he whispers. “What do I have to do?”

You hum, hiding your face in your thighs, thoughtful. “I’ll know.”

Heeseung almost chokes. “You’re playing with me.”

You tilt your head.

“Of course I am, Hee. Isn’t that what you like? What we always did? Playing games.” Your voice softens, teasing, the tone that always breaks him. “You’re obsessed, Hee. But to own me?” you shake your head slowly. “You’ll have to do more than just watch me cum on camera.”

A pause. You let it hang, let it burn. Then, low and teasing:

“If you really want me,” you whisper. “Stop being a coward. Show me.”

His breath catches. You almost feel the stillness on his end.

Click.

You hang up.

Still smiling, you toss your phone aside.

“Good night, Heeseung,” you murmur to the camera before shutting everything down.

Heeseung hadn’t heard your voice in three days.

Not on the phone, not through the headphones, not even that little intake of breath when you tiptoe around your room late at night.

Three days.

Seventy-two hours of silence.

No webcam flickers. No Notes app replies. No little “good night, Hee” teasing him through pixels.

Nothing.

He tapped at your IP like a lunatic. Pinging dead signals. Checked your cloud for new files. Scraped your cache for cam logs, anything—anything—that might prove you were still playing.

But you weren’t. You’d shut him out completely. Blocked him, in every way that mattered—except the one that destroyed him the most: in person, you were still perfect.

Because in real life, you were still her.

Still the step-sister who sat next to him at dinner, nudging his arm, sipping from his glass like it meant nothing. Still in those stupid soft modest dresses that smelled like your vanilla lotion and innocence. Still saying his name in that sweet voice that didn’t match the girl who once whispered “I’m yours” for a night, while fingering herself in his favorite dress.

Still shy smilling in front of the parents, like he wasn’t slowly going fucking insane of you ghosting him in the cruelest way possible.

Heeseung clenched his jaw until it hurt. His fists, tighter. You were torturing him. Training him with your silence. Denying him touch, sound, ownership—making him feel like just another loser watching from a screen.

And worst of all? You liked it.

He could see it in the way you smiled at him when no one was looking. Like the devil behind a halo. Like the dom who knew her puppy would crawl the moment she said good boy.

You knew what you were doing. And you knew he was starving.

He watched you meet someone new through your messages—tracked him from his first DM. The second the guy sent a heart emoji, Heeseung had full access to his cloud, laptop, phone, and location history.

So when you showed up at that guy’s place in that same dress as that night, Heeseung went feral. watching you through the guy’s hacked MacBook camera. Front-row seat. 1080p. Wide angle. Clear sound. Perfect view.

You didn’t even try to hide untapping your phone camera, angling it for him. But he was already there.

He watched the way you swayed when you walked into the room. That skirt was short—barely legal. Hair done like you were on a mission to ruin him. Lip gloss like you were asking to be kissed. Or owned.

Heeseung’s fists dug into his thigh. You let the guy kiss you. Hands on your hips. Heeseung scoffed in fury. The guy went down on you and Heeseung leaned forward—eyes glued to your face smiling at him. Not for the man.

Only for him.

You mouthed his name, Heeseung, made that sound again—that sweet gasp that cracked every nerve in his body—and his hands were already down his pants before he even realized it. Stroking slowly. Angry.

Then the guy started fucking you. It was… pathetic.

You looked bored. Pretty. But not wrecked. Not how Heeseung would have done you—needed you. Not how you looked when he edged you, whispering commands through your notes.

He texted :

He’s not even close to making you cum.Why are you with him?Stop.

Now.

Please.

You didn’t stop. You got louder. Not for performance, because knowing hee was watching, unleashed you.

Heeseung’s hand stuttered. He bit down on his bottom lip so hard it bled. You were performing. For him, not the other guy. You had to be. And yet you didn’t stop when he begged you.

Heeseung didn’t drink. Didn’t smoke. Didn’t call a friend.

He texted one of the girls who’d been orbiting him since he entered university—some pretty, pouty girl with no idea what she was walking into.

She came fast. Obedient. Heeseung fucked her like punishment.

Shoved her onto his lap, dragged her skirt over her hips without a single word. Didn’t ask if she was ready. Didn’t even pretend to care. Just spread her thighs, lined himself up, and buried in—rough, silent, merciless.

She moaned his name, kissing his neck. Heeseung kept his eyes on the screen. Because on the monitor behind her?

You were still live. Fucking someone else. His airpods were in. And he was moaning your name under his breath.

The girl was clueless to much overwhelmed by his deep, rough trust. Riding him like she thought she was doing a good job for him to be so feral.

Heeseung touched her the way he would have to you, controlling. forcing her in position trying to reach her deepest part, as he watched your hips roll on screen. Your nails dig into someone else’s back.

“Grippe my back. leave marks.” he ordered her.

He hiss, mouthing along with your sounds like a prayer.

“Fuck—Louder. Just like that... Just like that—fuck.”

The girl on his lap whimpered, “does it feel good, Hee?”

Heeseung stared at your body—your lips, your tits, your sweat-shined thighs.

“You’re so perfect,” he muttered. “Fuck—you…”

His climax came hard, violent. He choked your name on the exhale and came inside the girl like she didn’t matter—because she didn’t.

When the girl left, he stared at the screen for an hour. Watched you dress. Watched you check your phone. Smiling.

Not once did you reply to his messages.

You were killing him. Starving him. Making him beg. He slammed the laptop shut, chest heaving, hatred and love boiling into the same sick ache.

You were right. He was a coward. But not for much longer.

You found it on your bed. No card. No note. No sender. Just a black box, wrapped in a ribbon you never heard arrive. Inside: lingerie. Lace. Sheer. Decadent. Your exact size. Your exact taste. Lightly soaked in a scent you could recognize in your sleep—his cologne.

Your fingers trembled when you held it up to the light. No message. But then again, he never needed words.

Heeseung didn’t ask. He tried to command.

So, you didn’t text. Didn’t thank him. You just wore it.

That night, when the webcam light blinked to life, you were already sitting pretty in front of your laptop. Sheer fabric draped over your body like a sin begging to be confessed.

You leaned into the camera, eyes soft, voice sweeter.

“Goodnight, Genius. Hope uni’s not eating you alive.”

And then—

You logged off. Just like that.

Left him starving. You knew he’d pretend it didn’t affect him. He tried, bless him.

He texted the next day, like it was nothing. Invited you to his university party. Like this wasn’t war. Like he wasn’t already losing.

Of course, you went. Dressed in red. Not the lingerie—something sharper. Something that made his friends stare a little too long.

Heeseung barely spoke to you that night. Slipped back into his old self—like he hadn’t spent the week watching you like a man possessed. But he was in his element, charming his nerdy circle, and you were happy just watching him thrive.

Then, it changed.

He didn’t introduce you as his stepsister. That alone cracked the air between you. His hand found your back, fingers tracing lazy nothings while he laughed with his friends, eyes on you like you were art.

You liked seeing him smile. Liked knowing you made it easier.

And then—he excused you both. His friends wished you luck with admissions. So polite. So clueless.

He walked you up a narrow hallway, like it was nothing. A quiet corridor, half-lit.

Then he locked you in a hug.

And kissed your neck.

“You’re so pretty,” he whispered, hands already exploring.

“You too,” you murmured, smiling. “New haircut? You kept it long in the back. Looks good.”

“You said I should, so...”

You smiled harder, went in for a kiss—your first. His lips were maddening. Soft, sure, and hungrier than you expected. He kissed like he’d waited for years. Like he’d decided waiting was over.

"Untie your dress," he whispered against your mouth, voice low.

You raised a brow, smirking. “Thought you liked watching from afar.”

His jaw flexed. “Not tonight.”

You let the ribbon fall, letting the dress slip open. Underneath—his gift. His breath caught.

“You like it?” you teased.

He didn’t answer. He spun you, pressed you into the wall, and his hand was already between your thighs—finding you soaked.

His mouth brushed your ear, voice cracking with restraint.

“Fuck. You’re so wet for me. I’ve waited so long.”

“Say it,” he growled.

“What?”

His thrust was sharp—two fingers deep.

“Say you want me to ruin you. Say you like it.”

You whimpered, arching into his hand. “I like it when you ruin me.”

“Say it right.”

You licked your lips. “I want to be yours, Heeseung. Ruin me.”

His exhale was jagged—like something inside him broke.

Then came silence. Just heat. Breathing. Fingers moving in and out of you as he grinded against your body, shameless and reckless in a hallway anyone could walk into.

And just before you came—he pulled away.

“No,” he said simply. “Let’s go.”

“Home?”

“No. My room.”

His dorm was massive, dark except for the red glow of a snoozed monitor. His roommate was nowhere. Probably never real to begin with. You practically jumped on him. Messy kisses. Wandering hands. He kissed your neck, your shoulder, your back—and then—

Your hand brushed his desk. The monitors flared to life. And there you were—your webcam feed, glowing on the screen.

Recording. Your name as the file.

“You always make me watch,” he whispered, stripping you down to the lingerie. “Now watch yourself.”

He pulled you onto the bed, body still facing the screen.

“You’re mine,” he murmured, spreading your legs for the camera. “I’ve owned you since the first time you stepped into this house.”

On screen—your reflection trembled. Moaned. Melted in real-time.

He eased fingers inside you again while holding you in his lap, pinching a nipple until you gasped, breath tangled.

“I know what you fantasize about when you’re bored,” he whispered.

He started humping you, slow and heavy.

“I know what kind of porn you scroll past—then go back to.”

Thrust.

“I know which songs you loop when you touch yourself. I synced your playlist.”

You choked on a gasp.

“I know you changed your passwords, just to make me mad.”

His hand curled lightly around your throat.

“But I like it. I like when you pretend.”

He never slowed—just kept pushing you higher, mean and relentless.

And when you moaned his name?

He broke.

“I’m going to give you every twisted thing you’ve ever typed,” he growled. “Every fantasy you deleted. Every filthy draft you couldn’t finish. I’m going to make them real.”

Your climax slammed into you, shuddering through your bones—but he didn’t stop.

“I’ll tie you up in the library when no one’s looking,” he said, voice wicked. “Bend you over your best friend’s bed and leave a bruise only I’ll recognize.”

He laughed.

“I’ll make you cry my name with someone else inside you—just to remind you no one will ever ruin you like I do.”

You turned and kissed him, wild and unhinged.

He kissed back like a claim. Like he was branding your soul.

Then he grabbed you and threw you onto the bed. Reached for a condom.

You stopped him.

“It’s safe today, Hee. Do me raw.”

His pupils darkened. Something dangerous sparked.

He freed himself and dragged his cock against your wetness, teasing your entrance. You moaned each time the head kissed you. His smile was smug. Addicted.

“Heeseung. Please.”

He nodded—and slid in all at once.

You gasped, overwhelmed, stretched so good it hurt in the most perfect way.

He rocked into you deep and slow, biting your neck, lips pressed against skin he couldn’t stop worshipping.

Then he pulled you upright—still inside you.

“You like this position, huh?”

You nodded, dizzy, undone. He studied you like he’d been preparing for a test. He always aced those.

Then—his thrusts changed. Not faster. Just deeper. Harder.

“Hee—”

“Like that, yeah?”

You nodded again, mouth open, breathless at every delicious, punishing thrust.

He looked so fucking good like this—hair sticking to his forehead, lips parted, eyes glazed with need. You went for another kiss and he gripped your neck, slid to your hair, pulling until your back arched.

“Like that?”

“Yeah—yeah—fuck—don’t stop—”

He sucked your tits, relentless now, chasing both your highs. You clenched down so hard his groans turned ragged. He bit your nipple, then folded you in half, throwing your legs over his shoulders.

And then—he lost it.

He didn’t slow.

Not even as your body bucked under him, shaking.

He buried himself deeper, fingers biting into your hips, sweat dripping from his jaw as he fucked you like he wanted to unmake you.

The monitors kept rolling. Your name flashing on screen, over your own moans.

You reached for him—some desperate grasp for balance—but he pinned your wrists above your head, fucked you harder. One of your legs slipped off his shoulder, and he yanked it back up with a grunt.

“Keep it there,” he snarled, breath ragged. “Don’t move unless I say.”

You didn’t.

You couldn’t.

You were already too far gone.

You felt yourself stretch around him again, again, again—your walls pulsing and fluttering with every brutal thrust. It was filthy, unrelenting, and it wasn’t enough.

Heeseung's voice was in your ear, low and wrecked.

“This how you like it?” he panted. “Getting used like this—getting ruined on camera for me?”

You sobbed a yes—high and gasping—and he growled. His hips snapped forward again, this time shoving you higher on the bed.

“Fucking take it.”

He leaned in, biting your lip, grinding deeper. The rhythm turned meaner—each thrust slamming into you with brutal precision.

“You like knowing I’ll replay this?” he whispered. “Jerk off to it when you’re not around?”

You moaned helplessly.

“Want you to. I want you obsessed.”

“Oh, I am,” he said. “You made me this.”

His rhythm stuttered—he was close. You could feel him twitch inside, groaning against your mouth.

Then—

He came.

Hard.

Buried deep.

His whole body went taut over yours, shuddering as he emptied himself, hips rolling slower, deeper. You felt the heat inside you, the stickiness, the way his cock throbbed even after the high.

And still—he didn't pull out.

He kissed your collarbone, your throat, lazily now. Worn out. Quiet.

The screen behind him kept glowing.

Your body was wrecked, your heart pounding against his chest.

He pulled you close, like he wasn’t finished. Like he never would be.

The next morning, the sun barely broke past his blackout curtains. You were still half-naked in his sheets when you heard his fingers tapping at his laptop. A fresh hoodie hung off his shoulder, hair a messy halo.

“Hey,” he said, voice rough with sleep.

You groaned into the pillow. “Already working?”

He smirked. “Coding clears my head. Better than coffee.”

You rolled over. He looked too good like this. Soft around the edges. Eyes warm.

“I wish you could come here,” he said. “To my university.”

You blinked, suddenly alert. He smiled, but it didn’t reach all the way. “You did apply, right?”

“…Yeah.”

He nodded like he already knew. “But you didn’t tell me…pfff.”

Your stomach turned, just a little, as you smirked. “I didn’t want you to be happy for something so unsure.”

“I know.”

Silence. He got back typing.

“You really think I wouldn’t find out?” he said. “You think I’d just… let you leave somewhere else?”

You narrowed your eyes. “What did you do?”

He smiled. Shrugged. “Nothing you’ll ever be able to prove.”

Your heartbeat slowed. Thick. Smiling unsure.

“Heeseung...”

He stood, walking over. Calm. Barefoot. Still smelling like last night and wanting more.

“I didn’t touch your application,” he said softly. “But I might’ve nudged the scholarship committee. You’re exceptional, after all.”

You froze. “Why?”

“Because you belong here, in that prestigious place and nowhere else.”

His fingers grazed your chin. Tender. Possessive.

“...With me.”

You swallowed. He tilted your face up to his, eyes half-lidded.

“You would've turned it down if you knew,” he murmured, getting his lips closer, smooching slowly. “You’re too proud for that kind of help. Too proud to admit you want to be kept.”

Your voice caught in your throat. “That’s not why I applied.”

“I know why you applied, just like me.”

His thumb ghosted over your lower lip.

“That’s why I made sure you’d stay. to be free.”

A flicker of something dangerous passed between you. Or maybe it had always been there. He leaned in, lips brushing your ear.

“You think you’re playing me right now, huh,” he whispered, “but—what if I like being used, if it means I get to keep you?”

Your breath hitched. And he smiled. Like he’d already won. Or maybe he was wrong. Maybe you’d just let him believe he had.

Author’s Note:

Babies~ here it is!! 💗 The second part of my enha stepbro AU (first one was HUNTED).

I really hope this one pleased you… did it??? 🥺

I worked so hard on this piece to match the exact vibe I had in mind. Like—why was I waking up at 3 AM with wild ideas for scene effects that were borderline impossible to execute?! 😭🌀

This one definitely has a different flavor! While HUNTED leaned into soft, needy sub!Jakey energy (bless him), I wanted TRAPPED to explore the more intoxicating side of obsession—but not so far that we start hating our sweet little Heeseung~ Just a touch of crazy, y’know?

I really hope the mood translated well, because after rereading it 500 times, I fully lost that "first read magic" feeling I’m not super proud of this draft yet—kinda wish I had more time to proofread and polish it up. I’ll probably update it later (perfectionist problems 😭).

Next up is Part 3, which is supposed to be Sunghoon’s! Let me know if you want anything special in it—I’m all ears... and pervy brain. Just know it’s gonna involve dacryphilia, so bring tissues… for various reasons

XOXO

@heejunluvr @choeryyxyz @hoonprksung @schniti-is-in-the-house @ii2sanrio @woniedoyouloveme @saeris-world @gonorrheaisme @soobiverse

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