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silent obsession

Summary:

oikawa but hes a shameless stalker who jerks off in a van while watching you through your window and sabotaging every relationship you try to pursue. others may see it as repulsive, criminal even.

he sees it as acting on a future you havent realized he had 'envisioned' for you two.

but how can he stop when youre so sweet and innocent and beautiful and.. god he has to have you. but patience is a virtue that oikawa would claim he possesses.

Notes:

100% self-indulgent. i love oikawa and something about yandere men makes me itch (in a good way ofc)

i suck at tagging, so take my warning with a BLOCK of Himalayan salt.

also again, i dont use ai to write (aside from grammarly? idk) but i LOVE a big fat dash XD

Chapter Text

The city lights of Sendai blurred into streaks of gold and red as you hurried down the rain-slicked sidewalk, your coat collar pulled high against the April chill. It was the same route you took every Thursday after your shift at the bookstore—past the corner café with its glowing sign, under the skeletal branches of the old zelkova tree by the park entrance, and into the narrow alley that shaved ten minutes off your walk home. You’d always liked the quiet of it. Tonight, though, the quiet felt heavier. Watched.

You didn’t know why.

Three months ago, things had started to shift. Subtle at first. A guy from your literature class—nice smile, easy conversation—had walked you part of the way home after a meeting. He’d leaned in, then suddenly pulled back like he’d seen something over your shoulder. “Sorry,” he muttered. “I, uh… gotta run.” He never messaged again.

Then there was the regular from the coffee shop near the station. He’d flirted for weeks, finally asked if you wanted to grab dinner sometime. You made it as far as the crosswalk before his phone rang. His face went pale. He hung up, mumbled something about a family emergency, and practically sprinted the other way. You stood there in the rain, wondering what you’d said wrong.

Tonight it was the barista from the new café on the shopping street. He’d slipped you his number on a napkin with a playful grin. You’d laughed over warm drinks for twenty minutes. He’d even offered to walk you home.

Now he was gone too.

You glanced over your shoulder for the hundredth time. Nothing. Just empty sidewalk and the distant hum of traffic. Still, the skin at the back of your neck prickled.

There’s something wrong with me, you thought, keys already in your hand as you reached your apartment building. I’m too much. Or not enough. Or cursed.

You didn’t know about Oikawa Tooru.

He was thirty feet back, tucked in the shadow of the alley’s concrete wall where the streetlamp couldn’t reach. Dark hoodie, jeans, a cap pulled low over his familiar fluffy brown hair. He’d been there every Thursday for four months. He knew the rhythm of your footsteps, the way you tucked your hair behind your ear when you were nervous, the soft curse you muttered when your key stuck in the lock. He knew the exact second the light in your apartment would flick on, the silhouette of you peeling off your coat, the way you’d stand at the window for a moment staring out like you were searching for something you couldn’t name.

Oikawa didn’t move. He never did. Not once in all these months had he spoken to you. Not a text, not a note, not even a brush of shoulders in a crowd. He just watched. And waited.

His phone buzzed in his pocket—the burner he used only for this. A notification from the hidden camera he’d planted near the tree months ago. The barista had just stepped out of the café, heading toward your building with that easy grin still on his face. Oikawa’s thumb hovered over the screen. One tap and the message he’d pre-written would send: a single photo of the barista’s car parked outside another woman’s apartment last night, timestamped thirty minutes ago. Nothing else. No words. Just the picture.

The barista would see it. He’d freeze. He’d turn around and never look your way again.

Oikawa’s lips curved in the dark. He didn’t feel guilt. He felt right. Those men didn’t deserve your laugh, your late-night thoughts, the way you bit your lip when you were thinking deeply. They were temporary. Distractions. He was permanent. He’d been yours since the first time he saw you in the bookstore, reaching for a worn copy of a novel on the top shelf, the light catching in your hair.

Obsession had bloomed quiet and deep, like roots under concrete. It didn’t need contact. It just needed time.

The camera feed showed the barista stopping mid-stride, staring at his phone. His shoulders dropped. He turned and walked the other way.

Oikawa exhaled, slow and satisfied. The right time was coming. Not tonight. Not next week. He could wait. He’d waited this long—learning your routines, your fears, the exact shade of unease that flickered across your face when you thought you were imagining things. Soon you’d be so tired of the pattern, so convinced you were the problem, that when he finally stepped out of the shadows and offered you safety, you’d run to him.

He slipped the phone back into his pocket and melted deeper into the alley as your apartment light clicked on above.

You stood at the window, forehead pressed to the cool glass, staring down at the empty street. A shadow moved near the tree—maybe just the wind. You shivered.

“Get it together,” you whispered to the empty room. “No one’s there.”

But somewhere in the dark, Oikawa Tooru smiled.

He was closer than you’d ever know.

 

*****

 

The rain had stopped by the time Oikawa Tooru reached the rooftop across from your apartment building in Sendai, but the April air still clung damp and heavy to his skin. He settled into the familiar spot behind the rusted AC unit, black duffel bag at his feet, binoculars resting on the ledge. From here he could see straight into your living-room window when the blinds were half-open the way you liked them on quiet nights. Tonight they were. You were curled on the couch in an oversized sweater, knees drawn up, scrolling your phone with that small frown he’d memorized months ago—the one that said you were replaying every failed almost-date and wondering why you were the common denominator.

Oikawa’s lips twitched. If only you knew.

He’d known your name before you ever noticed him.

It started six months ago, not four. He’d been working nights at the 24-hour copy shop near Sendai Station, his second job to appear normal after this family axed him out of their estate, the kind of dead-end gig that let a man with a tech background, a sealed juvenile record, and nothing but time on his hands to disappear into the background. You had come in at 11:47 p.m. on a Tuesday, cheeks flushed from the cold, asking if they could print a rush order of poetry chapbooks for your literature class. You’d worn a soft black beanie and a scarf that smelled like vanilla and rain when you stood in front of the counter. Oikawa had taken your flash drive, fingers brushing yours by accident, and something in his chest had cracked open like a fault line.

He ran the files through his own laptop first. Standard procedure, he told himself. But then he kept the copy.

And he read every poem.

That was the night the obsession rooted.

At first, it was simple surveillance. Public records, social media, the cheap trail-cam he zip-tied to the zelkova tree near your building. He learned your routines the way university students memorize class itineraries. Coffee at 7:15. Bookstore shift until 6. Thursday night runs. The way you always checked over your shoulder twice when you reached the alley, like you could feel him even then.

A looming presence you couldn't seem to shake.

But the deeper he dug, the more he needed. He cloned your phone one night while you slept—easy when you knew the maintenance guy who left the lobby door propped. He read your texts, your search history, and your private notes app titled “Why am I like this?” He listened to your voice memos where you whispered doubts to yourself after another guy ghosted. He watched you cry once, alone on your couch at 2 a.m., and felt something dangerously close to tenderness.

Then, three weeks ago, he found the journal entry.

He’d been deep in your cloud backup, sifting through old photos and deleted files, when he opened a password-protected note labeled “Private—do not read (lol)”. Inside was a single paragraph dated almost a year earlier, written the night after your twenty-fourth birthday.

I’m twenty-four and still a virgin. Everyone thinks I’m joking or that I’m waiting for “the one.” Truth is I just… never felt safe enough. Never wanted anyone close enough to see all of me. It’s pathetic, right? Like I’m broken in some way no one else is.

Oikawa had stared at the screen until the words blurred. His hands shook. Heat flooded his chest, thick and possessive, the kind of rush he hadn’t felt since he was seventeen and learned the world would take whatever it wanted unless you took it first.

A virgin.

His virgin.

The realization rewrote every memory he had of you. Every time a guy had leaned too close at the café, every lingering glance from a customer at the bookstore—it wasn’t just annoyance anymore. It was blasphemy. Those men wanted to touch what had never been touched. They wanted to be the first to hear the sounds you’d make, to watch your eyes widen in that exact moment when trust tipped into surrender. They didn’t deserve the gift you’d kept so carefully guarded.

Only he did.

He’d earned it. He’d watched you for months without ever taking more than he was owed. He’d protected you from every unworthy hand that reached for you. He’d made sure the barista, the poet, the coffee-shop guy all vanished the second they got too close. Because he understood something they never could: You weren’t waiting for love. You were waiting for ownership. For someone who already knew every secret corner of your life and still wanted you exactly as you were—untouched, unseen by anyone else.

Oikawa lowered the binoculars now, breath fogging in the cool night. Across the street, you set your phone down and hugged a pillow to your chest, staring at nothing. He could almost hear the thought looping in your head again:

What’s wrong with me?

“Nothing,” he whispered into the dark, voice raw. “You’re perfect. You’ve been saving yourself for me.”

The obsession had been growing since that first night at the copy shop, but the virgin revelation had crystallized it into something absolute. No more half-measures. No more waiting for the “right time” out of caution. He would keep clearing the path until you were so exhausted by loneliness that when he finally stepped into the light—maybe with a story about how he’d “just moved in down the street” or “recognized you from the bookstore”—you would fall into his arms like you’d been waiting for him your whole life.

He already knew how it would feel. He’d replayed it in his mind a thousand times: your soft gasp when he finally touched you. The way you’d tremble because no one else ever had. The quiet, perfect moment when you realized he was the only one who had ever truly seen you.

Oikawa zipped the duffel shut and slipped back down the fire escape, boots silent on the metal rungs. The city hummed around him, indifferent. Somewhere below, a siren wailed. He smiled into the shadows.

Soon.

He could wait a little longer. The prize was too precious to rush.

And when the time came, you would never be alone again.

 

*****

 

The obsession didn’t creep anymore. It roared.

Two weeks after the rooftop vigil, Oikawa Tooru sat in the back of a windowless van he’d parked three blocks from your apartment building in Sendai, the kind of nondescript gray panel van that blended into every quiet side street near the station. Inside, the glow of three monitors lit his face in cold blue. He’d stopped pretending this was casual surveillance days ago. The cheap trail-cam in the zelkova tree had been upgraded to a 4K unit with night vision and audio. A second camera now watched the alley from the roof of the abandoned building across the way. And the phone—your phone—had been his masterpiece.

Hacking it had been almost too easy. You still used the same password you’d typed into the copy-shop computer six months ago: the title of your favorite poem, the one you’d whispered under your breath while waiting for your chapbooks. He’d cloned the entire device remotely while you slept, mirroring every text, every photo, every late-night Google search. Now your life streamed live into his laptop like a private television show written just for him.

He knew you’d cried again last night. He’d listened through the microphone as you recorded another voice memo at 1:13 a.m., voice thick with frustration.

“I don’t get it. Three guys in two months and they all just… vanish. Am I that repulsive? Or is the universe trying to tell me something?”

Oikawa’s fingers tightened around the edge of the desk he’d bolted into the van’s floor. No, baby. The universe is clearing the path. For me.

He scrolled through your new photos. A mirror selfie in the bookstore bathroom after your shift—hair messy, cheeks flushed, wearing that soft black sweater that clung just right. He saved it to his encrypted folder, the one already holding 3,847 images and videos of you. Then he opened your search history.

why do guys ghost after one date?
am I giving off weird energy?
how to tell if someone is watching you?

The last one made his pulse spike. You were starting to feel it. Good. The fear would make you need him more when he finally appeared.

But it was the private note you updated yesterday that pushed him past the edge.

Still a virgin at 24 and a half. Still waiting. Still wondering if I’m the only one who feels this… hollow. Like everyone else got the instruction manual for intimacy and I missed the class. I want to be touched so badly it hurts, but only if it’s real. Only if it’s safe. Only if he sees all of me and still stays.

Oikawa stared at the words until they burned behind his eyelids. His breath came short and ragged. He’d known you were untouched. He’d cherished it like a secret sacrament. But reading it in your own trembling words—knowing you were aching for exactly what he alone could give you—snapped something deep inside him.

He wasn’t just watching anymore.

He was starving.

Every night he followed you home, closer now. Twenty feet instead of thirty. He memorized the exact creak of your apartment stairs, the soft click of your deadbolt. He’d started slipping inside the building when the landlord left the lobby door ajar—easy when he knew the landlord’s schedule too. He never went into your unit. Not yet. But he stood outside your door for minutes at a time, ear pressed to the wood, listening to you hum off-key while you made tea, the rustle of your clothes as you changed for bed. Once he caught the faint sound of your shower running and had to grip the banister until his knuckles whitened, imagining the water sliding down skin no one else had ever tasted.

His dreams weren’t dreams anymore. They were plans. Vivid, filthy, reverent plans. He would be gentle at first—because you deserved worship, not rush. He would kiss the inside of your wrist, tell you he’d been waiting his whole life for this exact moment. Then he would take what had always been his. Slowly. Thoroughly. Until you were gasping his name and realizing he was the only man who had ever truly known you.

Last night he almost broke.

You’d come home from another failed coffee “date” (the barista’s replacement, some salaryman who’d lasted exactly forty-three minutes before Oikawa sent the anonymous email with the fabricated domestic-violence report from the guy’s ex). You had slammed your door, kicked off your shoes, and cried so hard he could hear it from the hallway. He’d stood there in the dark, palm flat against your door, whispering, “I’m here. I’m right here. Just open it, and I’ll fix everything.”

He’d almost knocked.

Instead he’d backed away, heart hammering like a war drum, and retreated to the van. But the restraint was fraying. The obsession had grown teeth. It whispered to him constantly now: You’re ready. You’re lonely. You’re his. Take her.

Tonight the rain was back, soft and steady, turning the city into watercolor streaks. Oikawa sat on the rooftop again, binoculars trained on your window. You were pacing in your living room, phone in hand, rereading old texts from the latest ghosted guy. Your shoulders were slumped. You looked so small. So tired of being alone.

He zoomed in until he could see the exact tear tracking down your cheek.

His own hand trembled as he lowered the binoculars.

“I can’t do this anymore,” he breathed into the night, voice cracking with raw need. “I can’t just watch you hurt like this. Not when I’m the one who’s supposed to make it stop.”

He stood up, rain soaking through his hoodie, and started down the fire escape. Boots silent. Heart thundering.

The right time wasn’t coming.

It was now.

Across the street, you paused at your window, forehead against the glass again. You scanned the empty sidewalk, the alley, the shadows under the zelkova tree. Nothing. Just the rain and the feeling that something—someone—was finally done waiting.

You shivered and pulled the blinds closed.

But it was too late.

Oikawa was already crossing the street, hood up, steps measured, the burner phone in his pocket already drafting the first message he would ever send you.

He couldn’t stay in the dark any longer.

Not when you were waiting for him to step into the light.