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Workout of the Heartless

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Sidney spends her whole time working and working out. She's incredibly ambitious. She doesn't have time for a proper relationship but she decides that Oli meets the criteria of a casual sex partner. Oli has a partner already, but she believes it won't be hard to seduce him. Interactions should initially take place at the office. Don't set them at a gym. Oli is really weak and Sidney incredibly strong. Oli is noticably attracted to her.

Chapter 1: The Server Room Encounter

The hum was the first thing you noticed, and the last thing you forgot. A deep, constant thrumming that vibrated up through the soles of your shoes and settled in your molars. It was the sound of a thousand fans whirring, of processors thinking in the dark, a mechanical heartbeat. Blue and green LEDs dotted the endless aisles of towering server racks like malevolent constellations, casting long, shifting shadows across the concrete floor. The air was cool, almost cold, but carried the sharp, clean scent of ozone undercut by something else, something human: a faint trace of old sweat and anxiety.

Oli checked his watch for the third time in five minutes.8:47 PM.He was alone, or he was supposed to be. The legacy migration script was running, a tedious, twelve-hour process that required physical oversight in case a tape drive decided to gripe. He’d volunteered for the graveyard shift to avoid the office chatter, to just get it done.His own breathing seemed too loud against the omnipresent drone.

He jumped when a new shadow fell across his terminal screen, long and broad and utterly still.

“Hey, Oli.”

The voice was low, calm, and cut through the mechanical white noise like a knife through silk.He knew it.Everyone in the department knew it.

He swiveled in his chair.She stood at the mouth of the aisle, her shoulders nearly brushing the racks on either side. Sidney.She wasn’t wearing her usual blazer. Just a tight black tank top that strained over the dense, rounded slabs of her shoulders and chest. Her arms, crossed over her torso, were veins and definition under the cool LED light.Her hair was up in a severe, practical knot. She was just… standing there.Looking at him. A ripple of primal awareness traveled down Oli’s spine, the kind that had nothing to do with job titles and everything to do with mass, and presence, and intent.“Sidney.Hey. Uh… what’s up?” he said, forcing a casual tone that cracked at the edges.“Checking on the migration? It’s at seventy-two percent. No errors.”

“I’m not here for the migration.”

She took a step forward.Then another.Her movements were economical, purposeful. Each step brought her deeper into the narrow channel of technology, closer to him. The space, never large, suddenly felt like a coffin lined with blinking lights. She stopped a few feet away, leaning back against a rack frame.It didn’t creak. She looked entirely at home, a predator in its electric jungle.Oli’s mouth went dry.“Okay. So, what’s…?”

“I’ve been watching you,” she said, her tone conversational, as if discussing a pull request.“You watch me.In the gym.In the cafeteria.In stand-ups. You try to hide it. You’re not very good at it.”

A hot wave of shame and panic flushed through him. He opened his mouth to deny it, to laugh it off, but the words died.Her gaze held his, flat and assessing, and he knew lies would be pointless. He’d looked.Of course he’d looked.Everyone looked. You couldn’t not look at Sidney.She was a force of nature.

“I… I have a girlfriend, Sidney.”

“I know,” she said, a flicker of something dismissive in her eyes. “That’s irrelevant.”

“It’s not irrel—”

“It is.” She pushed off the rack, taking one final step that eliminated any concept of personal space. He had to tilt his head back slightly to meet her eyes.He was taller, but in that moment, he felt infinitesimally small. The sheer physicality of her was overwhelming up close—the breadth of her, the defined cut of her jaw, the cool, focused power in her stance.She smelled like clean cotton and something metallic. “I want you, Oli.Simple.No strings.No drama. No one needs to know.”

He let out a choked, nervous laugh.“You’re joking. This is a joke, right?Justin put you up to this?”

“Do I look like I joke?”

He swallowed. She didn’t.She looked utterly, terrifyingly serious. His heart was a frantic bird against his ribs.This was insane.Wrong.He was with Maya.He loved Maya. But a treacherous, whispery part of him, a part he’d kept locked in a dark cellar of his mind, was stirring, stretching.This was Sidney.Sidney wanted him. The impossibility of it was a drug.

“I can’t,” he whispered, the sound swallowed by the fan-hum.

“You can.” Her hand came up, not to touch him, but to gesture at the room around them.“There’s no one here.It’s just the machines. They don’t judge. They don’t tell.” Her eyes scanned his face, reading the conflict like an open log file.“You’re curious.I see it. You look at me and you wonder what it would be like.To not be in charge for once. To let someone else decide.”

It was like she’d reached into his skull and pulled out his most secret, shameful thoughts.He felt exposed, flayed open under the cool blue lights. He shook his head, a weak, involuntary motion of protest.Her voice dropped lower, a vibration he felt in his chest. “Say no, Oli. Look me in the eye and tell me, definitively, to leave you alone.Say you don’t want this. That you’ve never thought about it.”

He tried.He tried to form the word.‘No.’ A simple syllable. It stuck in his throat, a lump of cotton and fear and wild, exhilarating want.His jaw worked. Nothing came out.A slow, knowing smile touched Sidney’s lips.It wasn’t warm. It was a smile of conquest, of confirmation.She had her answer.

She didn’t wait for the words he couldn’t say.Her hand, finally, made contact.Not a caress. A firm, undeniable grip on his bicep, pulling him up from the chair. He rose unsteadily, his legs feeling boneless. He was looking down at her now, but the height difference meant nothing.She was in complete control.

“The script has hours to go,” she said, her voice all business again, as if she’d just solved an engineering problem. She turned, still holding his arm, and led him deeper into the labyrinth of racks, away from the only exit, toward a small, dim service alcove where the humming was loudest, a wall of sound that would swallow everything. “No one will disturb us.”

The alcove was narrower than he’d imagined, a dead-end corridor of cold, brushed metal.The hum here was a physical pressure, sealing them in a bubble of sound. Sidney released his arm, but her body now filled the only path back to the open aisles. She leaned against one rack, a study in relaxed power.

His mind was a screaming chorus of wrong, wrong, wrong and but it’s Sidney. He saw Maya’s face, smiling over coffee that morning.The guilt was a sharp, sour taste in his throat.He had to leave. Now.

“I should… I need to check the logs,” he mumbled, not meeting her eyes. He made a move to step past her, a half-hearted sidle towards the gap between her and the opposite rack.Her hand came up, not fast, but with a terrible, inevitable certainty. A single palm planted firmly against his chest.It stopped him dead.

“Oli,” she said, her voice almost lost under the fan-whir. “I didn’t say you could go.”

A hot spike of something—embarrassment, panic, defiance—jolted through him. This was insane.He was a grown man. He took a deep breath, set his feet, and pushed forward, putting his whole weight into it.Nothing happened.It was like shoving a building. She didn’t brace.She didn’t strain.Her arm didn’t tremble. She just stood there, leaning casually, her palm a warm, unyielding wall against his sternum.He grunted, pushing harder, his back leg driving against the concrete floor. His muscles corded.Hers did not.A low, melodic laugh escaped her. It was the most unnerving sound he’d ever heard.“See that?” she said, her head tilting. “That’s your total output.You’re putting everything you’ve got into it. And look at me.” She flexed the arm holding him back. The muscle swelled, hard and defined even in the shadowy light.“I’m not even trying. I’m literally just… here.”

Humiliation burned his cheeks.He stopped pushing, his breath coming in short gasps. Hers was even.“Could she do this?” Sidney asked, her tone genuinely curious. “Your girlfriend.If you tried to walk away from her during a fight, could she just stop you? Like this?” She gave a slight, easy press forward with her hand, making him rock back a step before she eased the pressure.He couldn’t answer.The truth was a pit in his stomach. Maya was tiny.She’d hug him to stop him, or cry. She couldn’t… this.“I doubt it,” Sidney answered for him. “That’s not a criticism of her.It’s physics.Mass times acceleration.I have the mass. You, frankly, have neither.” She finally removed her hand, leaving a phantom imprint of heat on his chest.She looked him up and down, a slow, appraising glance. “All that potential energy, and no density to back it up. It’s kind of fascinating.”

He just stood there, utterly defeated, his heart hammering a frantic rhythm of shame and a dark, thrilling awe.

She reached out and patted his cheek, twice.It wasn’t affectionate.It was condescending. “Think it over, Oli.The script’s still running. You know where I am.”

She turned and walked out of the alcove, her movements smooth and unconcerned. The space she left behind felt suddenly vast and empty, filled only by the deafening, judgmental hum of the machines.Oli slumped against a cold server rack, his legs weak. The ghost of her hand on his chest felt more real than the metal at his back. He listened until the sound of her footsteps vanished into the white noise, leaving him alone with the choice she had not asked him to make, but had already proven he couldn’t refuse.

He listened until the sound of her footsteps vanished into the white noise, leaving him alone with the choice she had not asked him to make, but had already proven he couldn’t refuse.

For twenty minutes, he didn’t move. The script ticked up to seventy-eight percent. The hum was inside his skull now. He thought of Maya, of her soft laugh, of the way she’d knit her brows when she was worried about him working late. The guilt was a physical nausea. He pushed off the rack, his joints stiff. This was insanity. He was a good person. He had a good thing. He just needed to say it, clearly, and walk out. Go home. Forget this ever happened.

He found her not in the alcove, but in the main monitoring station, a glass-walled cube at the heart of the labyrinth. She was studying a wall of network topology maps, one muscular arm braced against the doorjamb. She didn’t turn as he approached, but he saw the faintest tilt of her head. She’d heard him.

“Sidney.”

“Mmm.”

“I… I came to tell you. I can’t do this. I’m not throwing away my relationship for… for some meaningless…” he trailed off, the word ‘sex’ sticking in his throat.

She turned then, slowly. A faint, amused smile played on her lips. “Who said it would be meaningless? It would be transactional. Direct. Efficient. And for you, Oli, it would be the best sex possible. The most memorable experience of your life.” She said it with the flat certainty of someone stating a technical specification.

“That’s arrogant.”

“It’s factual. You’re operating on a hypothesis without data. Let’s run a comparison.” She unfolded her arms and took a single step towards him. “Show me a picture of your girlfriend.”

The request was so bizarre, so off-script, that his brain stuttered. “What? No.”

“Show me.” Her tone didn’t change. It was a command.

His hand moved to his pocket, hesitating. This was a trap. Everything with her was a trap. But some part of him, the part that compiled code and compared outputs, was morbidly curious. He pulled out his phone, unlocked it, and fumbled to his photo gallery. He found a safe one—Maya at a picnic, smiling, wearing a sweater. He turned the screen.

Sidney’s hand shot out, faster than he could react. She plucked the phone from his grasp. Her fingers moved with swift, swiping precision. She scrolled past the picnic, past a dinner, past a movie night. Her expression was one of detached analysis. Then she stopped. A photo from their beach trip last summer. Maya in a turquoise bikini, cute, grinning, holding a cocktail. She had a lovely, gentle figure.

A short, sharp laugh escaped Sidney. It wasn’t cruel. It was the sound of someone encountering a fundamental miscalculation. She handed the phone back to him.

“Look at her,” Sidney said.

Oli stared at the photo, at Maya’s happy face. A protective wave of love and guilt hit him.

“Now,” Sidney’s voice dropped, a low vibration in the cool air. “Look at me.”

Before he could process the command, her hands went to the hem of the black tank top. In one smooth, effortless motion, she pulled it up and over her head, letting it drop to the floor.

Oli’s breath left his body in a silent rush.

The LED light painted her torso in stark relief. This was not the curated, soft-filtered fitness of social media. This was raw architecture. Her shoulders were vast, capped with deltoids like polished river stone. Her chest was not a collection of breasts, but a solid, angled plateau of pectoral muscle, veined and defined, sweeping down to a ribcage so lean each bone seemed etched beneath skin. Her stomach was a complex grid of abdominals, a topography of hard-earned power. There was no softness, no curve meant for cradling. It was a body built for one thing: dominance. It was terrifying. It was the most awe-inspiring thing he had ever seen.

“You see the difference,” she said, not as a question. Her voice was calm, instructional. “She is built for decoration. For softness. I am built for function. For output.” She took a step closer, and he couldn’t look away from the sheer physical reality of her. “Sex with her is, what? Nice? Comfortable? You probably do most of the work. You probably worry the whole time—am I doing this right? Is she bored? Is she faking it?”

Each question was a pinpoint strike. He felt transparent.

“With me,” she continued, her gaze locking onto his, “you wouldn’t be capable of work. You would be substrate. You’d be trying, with everything in that skinny frame, to keep up. And you would fail. Gloriously. I would decide everything. The pace. The duration. The point of failure. You’d experience sensations you didn’t know your body could register. Because I know mechanics. I know leverage. I know exactly how to apply force for maximum effect.” She let her eyes travel over his lanky form, a dismissive audit. “You’ve spent your life in your head. Your girlfriend likely validates that. She probably tells you you’re smart, you’re sweet. She doesn’t show you what you actually are. Physically insignificant.”

The words were ice water. He wanted to protest, to defend Maya, to defend himself. Nothing came out.

“She can’t give you what I can,” Sidney finished, her voice almost a whisper now, yet it cut through the hum like a laser. “She can’t show you your own limits. I can. That photo? That’s a hobby. This,” she gestured to her own form, “is a dedicated purpose. You have a choice, Oli. But let’s stop pretending it’s a choice between right and wrong. It’s a choice between a gentle fiction and a hard truth. Between what feels good and what is.”

She stood there, exposed and utterly unconcerned, a monument to her own argument. Oli looked at the phone in his hand, at Maya’s smiling, unsuspecting face. Then back at the sheer, imposing reality of Sidney. The battle wasn’t between desire and loyalty. It was between the person he thought he was and the truth she was reflecting back at him—a truth of wanting, of insignificance, of a dark, gravitational pull he could no longer rationalize away.

He opened his mouth.

No sound emerged.

He just stared, the phone screen going dark in his limp hand.

He just stared, the phone screen going dark in his limp hand. The hum of the servers filled the silence between them, a thousand tiny witnesses. Sidney watched him, the faint, predatory curve still on her lips.She saw the exact moment his resistance crumbled. Not with a dramatic shout, but with a slow, defeated sag of his shoulders. The fight left his posture like air from a punctured tire.“Okay,” he whispered. The word was swallowed by the fan-whir, barely audible.She didn’t congratulate him.She didn’t smile wider. She simply accepted it as her due.“Good,” she said, her voice flat. Then she moved.In two strides she was on him. Before Oli could process it, her left arm hooked under his legs, her right hand splaying across his back. She lifted him as easily as someone might lift a laptop. It wasn’t a bridal carry; it was a functional, dismissive hoist, like moving a piece of equipment.A sharp, startled breath hissed between his teeth. His own lanky frame, always a source of clumsy self-consciousness, felt utterly weightless in her hands.He instinctively threw his arms around her neck for balance. The solidity of her was a shock—dense, unyielding muscle wrapped in warm skin.His head swam. The scent of her, clean sweat and ozone, filled his nostrils. His hands, shaking slightly, began to move almost without his permission. They slid over the impossible breadth of her shoulders, fingertips tracing the hard ridges of her traps, down the deep valley of her spine. It was like exploring a landscape of living stone.He looked down at her face, so close now. Her expression was one of cool amusement.He leaned in, breathless, and kissed her.It wasn’t gentle. It was a claim, a surrender, a messy press of confusion and desperate want. She kissed him back with a controlled intensity, her lips firm and demanding. She smirked against his mouth, the vibration of it searing his nerves.She was enjoying this.His compliance.His awe.

When the kiss broke, he was panting. His hands were still moving, roving over the carved expanse of her chest and stomach.The sheer reality of her under his palms was intoxicating. His gaze dropped, drawn downwards by a palpable, pressing heat against his hip.He knew what it was. It was just a fact of her, like her height or the color of her eyes.

With a trembling hand, he fumbled with the button of her trousers, then the zipper. He didn’t ask.He just needed to know. Sidney watched him, her arms still holding him aloft with effortless strength, a single eyebrow raised in silent challenge.He reached in. His fingers brushed against thick, hot silken skin, and then closed around a hardness that made his breath catch. He gasped, his eyes widening. His grip adjusted, trying and failing to encompass its full, daunting girth. A slow, incredulous smile spread across his face as he looked up at her, his expression a mix of shock and pure, unadulterated admiration.

“Yeah,” Sidney said, her voice a low, cocky rumble. She shifted her stance slightly, pushing herself more firmly into his grasp.A smug satisfaction glittered in her eyes. “Told you you weren’t ready.”

The air in the monitoring station was cool, but Oli felt like he was burning up. Sidney’s words hung between them, not a taunt but a simple statement of fact. His hand was still wrapped around her, the reality of her size and heat searing his palm. He wasn’t ready. He knew it. The knowledge should have been humiliating, but it was eclipsed by a dizzying, electric awe.

“So get me ready,” he heard himself say. The words were barely a whisper, raw and exposed.

Sidney’s smirk deepened. She lowered him until his feet touched the floor, but her arms remained around him, a cage of solid muscle. “Clothes off. All of them.”

It wasn’t a suggestion. It was the next logical step in the process. Oli’s fingers fumbled with the buttons of his own shirt, his movements clumsy under her unwavering gaze. He shed his shirt, letting it drop atop her discarded tank top. His skin prickled in the chilled air. He was pale, his frame a collection of sharp angles and faint ridges—the physique of a man who thought lifting a laptop was exercise.

Sidney watched, her expression one of clinical assessment. “Pants,” she said.

He toed off his shoes, pushed his trousers and briefs down in one awkward motion, and stepped out of them. He stood before her, completely exposed. He felt every inch of his own slightness, the vulnerability of his skinny legs, the narrowness of his hips. His own arousal seemed almost comical in its standard-issue proportion, a stark, personal contrast to the formidable reality of her.

She finally moved, stepping back to finish undressing. Her motions were efficient, devoid of any performative seduction. The rest of her clothes joined the pile on the concrete. And there she was.

Oli’s breath caught. The photos, the glimpses under clothes—none of it prepared him for the totality of her. She was a monument. Her thighs were like sculpted tree trunks, her calves dense cords. Every muscle group was defined, separation clear even in the dim, multi-hued light from the server racks outside the glass. The proud, assertive length of her cock jutted out from a thatch of dark hair, thick and heavy. She wasn’t just a woman with muscles. She was a powerhouse built on a different scale entirely.

He looked down at his own body, then back at hers. The comparison was laughable. He was a sapling next to an oak. A whisper next to a shout. The heat of shame flooded him again, but it melted, transmuted by the sheer, undeniable force of her presence into something else: a deep, submissive hunger.

“See?” Sidney said, her voice a low rumble. She wasn’t gloating. She was just pointing out the data. “Physics.”

Before he could form a thought, she moved. In one smooth, powerful motion, her hands were on him again—one under his thighs, the other across his back. She lifted him as easily as before, but this time she turned and, in two strides, placed him sitting on the edge of the central monitoring desk. The cold laminate bit into his bare skin. The multiple screens behind him glowed with scrolling logs and network traffic, a silent, digital audience.

She stepped between his splayed legs, her overwhelming frame blocking out the rest of the room. Up close, the difference was even more profound. His thin legs bracketed her muscular thighs. His own modest erection stood pitifully small against the solid warmth of her stomach. He felt like a doll in the hands of a giant.

“This will be easier for you,” she said, her hands settling on his hips. Her grip was firm, possessive. There was no fumbling, no awkward negotiation. She knew exactly what she was doing. She reached between them, her own hand, large and capable, guiding herself. The blunt, broad head of her pressed against him.

Oli gasped, his fingers scrabbling for purchase on the smooth desk. “Sidney, I—”

“Relax,” she commanded, her tone brooking no argument. It wasn’t gentle.It was an order. And then she pushed forward.

It wasn’t a slow, careful entrance. It was a deliberate, unstoppable invasion. A stretch that burned, that stole the air from his lungs. He cried out, a short, sharp sound lost in the hum. His head fell back, his eyes squeezed shut. It was too much. She was too much.

But she didn’t stop. She sheathed herself inside him with a single, relentless thrust, until he was utterly, completely filled. He felt stretched to his limit, dominated in the most fundamental way possible. He panted, tears pricking at the corners of his eyes from the overwhelming sensation.

“Look at me.”

He forced his eyes open. Her face was above his, flushed, her jaw set with concentration. There was no softness there, only fierce, focused intent. She began to move.

And it was nothing like he’d ever known.

There was no rhythm he could follow, no pace he could match. She set it all. Her hips drove into him with piston-like force, each powerful thrust rocking his entire body back against the hard desk. The sensations were a chaotic storm—deep, penetrating fullness, the sharp bite of the desk edge against his tailbone, the unbelievable sight of her immense body moving over his helpless, supine form.

She fucked him with the same ruthless efficiency she applied to everything else. It was a technical mastery of anatomy, of leverage. She adjusted angles subtly, and the feeling would shift, starbursts of shocking, unexpected pleasure erupting amidst the overwhelming pressure. She was, unfortunately, amazing at sex. All her bravado wasn't just talk; it was a promise she was brutally, expertly fulfilling.

“You’re… god…” he choked out, his hands finally finding her shoulders, clinging to the hard, rolling muscle there.

“I know,” she grunted, her breath coming harder now. Sweat gleamed on her collarbones, on the powerful slope of her chest. She picked up the pace, her movements becoming faster, more aggressive. He was just along for the ride, a passenger in his own body. The world narrowed to the slap of skin, the hum of the machines, her focused grunts, and the terrifying, incredible feeling of being completely and utterly overpowered.

His own arousal, which had flagged momentarily from the shock, returned with a vengeance, trapped and painfully hard between their bodies. He was going to come. The realization was a distant shock. He hadn’t been touched, hadn’t been focused on. It was just a byproduct of the sheer, brutal stimulus she was administering.

She saw it on his face. A grim, triumphant smile touched her lips. “Yeah,” she breathed, driving into him harder, deeper. “There it is. Let it go.”

It wasn’t permission. It was the last command. His body obeyed. Pleasure detonated through him, white-hot and seismic, wrenching a ragged, broken cry from his throat. He convulsed, his back arching off the desk, his vision whiting out. It was less an orgasm and more a systemic collapse.

Through the haze, he was dimly aware that she didn’t stop. She used his convulsing sensitivity, her own rhythm becoming frantic, urgent. With a final, guttural sound that was more a growl than a moan, she slammed into him and went rigid. He felt the hot, deep pulse of her release inside him. She held herself there, trembling with the force of it, her full weight pinning him to the desk.

For a long moment, there was only the sound of their ragged breathing and the endless, judgmental hum of the servers. Slowly, she leaned back, pulling out of him. The sudden emptiness was a shock. He felt liquid, boneless, wrecked.

She looked down at him, her chest still heaving. A slick sheen of sweat covered her. She looked like a warrior after a battle. He, by contrast, looked like the battlefield.

She reached out and cupped his cheek again, the gesture almost an afterthought. “Eighty-four percent,” she said, her eyes flicking to a progress bar on a screen behind his head.

Then she turned, picked up her clothes, and began to dress with the same methodical efficiency. Oli could only watch, slumped against the desk, his mind a void of static and aftershocks. The cool air was raising goosebumps on his spent, sweat-damp skin.

She pulled her tank top back on, the fabric stretching over her formidable frame. She didn’t look at him as she spoke. “The migration will finish at 4:17 AM. I expect the summary report on my desk by 9:00.” She stepped into her trousers, zipped them.“You should get dressed. It’s cold.”

And with that, she walked out of the monitoring station, her footsteps fading into the eternal hum of the machine hall.

Oli was alone. The phantom feel of her, the deep, lingering ache, the smell of sex and ozone—it all clung to him. He looked at his own skinny, bare legs dangling from the desk. He looked at the dark, empty doorway.

He slowly, achingly, slid off the desk and gathered his clothes. Each movement felt strange, as if he were re-inhabiting a body that no longer belonged to him. As he pulled on his shirt, his eyes fell on his phone, still dark on the floor. A sharp, jagged slice of guilt cut through the haze. Maya.

He picked up the phone but didn’t turn it on. He just held the cool, black rectangle in his hand. The memory of Sidney’s body, the feeling of her hands, the shocking expertise of her—it flooded back, vivid and overwhelming, instantly smothering the guilt under a wave of pure, addictive sensation.

He finished dressing, his hands trembling only slightly. He walked back to his terminal on numb legs. The script counter glowed: 84.3%. He sat down in his chair, the leather now feeling unfamiliar.

He had hours until the report was due. Hours to sit in the humming dark, with nothing but the ghosts of her touch and the terrifying, thrilling knowledge that she had been right about absolutely everything.

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