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Synthetic Heart

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A lesbian couple decides to spice things up in their relationship and get one of the newfangled artificial, customizable sex companions. Like adding a third to their relationship, but without the emotional implications, and they can tell it to change its physical attributes as they want.

Chapter 21: A New Beginning

Steam still curled from their skin as they padded, naked and damp, into the living room. The argument in the bathroom had been compressed, folded into the humid shower air and rinsed away—for now. A fragile, deliberate calm had taken its place. The loft’s expansive windows showed a bruised evening sky, the last remnants of sunset bleeding into city-light pollution. The space felt both too large and terribly intimate.

Margot grabbed a soft cashmere throw from the back of the sectional, draping it around her shoulders more for a sense of armor than warmth. Elena, unselfconscious in her nakedness, curled into the opposite corner, tucking her feet beneath her. Her gaze was fixed on Stella, who stood motionless near the glass coffee table.

“Come here,” Elena said, her voice quiet but clear.

Stella obeyed, its movements fluid and silent. It settled on the middle cushion, a careful distance from them both. The diffused light from the floor lamp glinted off its iridescent skin. It had maintained the form it had taken during their shower: the new default they set days ago, the "enhanced Margot" version -- Margot, but slightly taller, slightly larger breasts, and slightly more muscular. The short auburn hair, the constellation of freckles across the bridge of its nose and shoulders, the lean, wiry build. It was Margot... but enhance. Its expression was one of blank availability.

“The lingerie,” Margot heard herself say, the words dry in her throat. “Put it on. Elena's black set from the top drawer.”

Elena glanced at her, a question in her eyes.

Margot forced a casual shrug she didn’t feel, “it might as not be completely naked.”

Stella rose and walked to Elena’s bedroom, returning moments later. The lingerie was an expensive French set of black lace and silk. On Elena, it was decadent, straining over her full curves. On Stella’s Margot-form, it hung differently. The bralette was loose, but fitting, the silk shorts sat low on its narrow hips. And there, at the juncture of its thighs, the lace stretched tight over a distinct, soft bulge.

“Well,” Elena breathed, a slow smile touching her lips. Her eyes traveled the length of the figure, from the copied face down to that telling swell of fabric. “That’s something.”

Margot stared. It was profoundly unsettling. It was her own body, refracted through a funhouse mirror that added a cock. A small one, by Stella’s recent standards—perhaps six inches, modestly thick, resting in the silken hollow of the shorts. But its presence was an electric violation. It was a crude annotation on her own form, a physical manifestation of everything she felt was wrong.

“It’s a good look,” Elena said, leaning back, her head tilting. “Uncanny. But good. Don’t you think, Margot?”

Margot took a sip of water she’d brought from the kitchen, the glass cool in her hand. “It’s a look, all right.”

Elena reached out a foot, her toes brushing Stella’s calf. “Come closer.”

Stella shifted along the couch until it was within reach. Elena’s exploration was tactile, curator-like. She traced the line of the copied jaw, the slope of the copied shoulder. Her fingers slipped beneath the loose lace of the bralette, finding a small, stiff nipple. Stella remained passive, its breathing even, its copied eyes watching Elena with empty warmth.

“It’s so strange,” Elena murmured, more to herself than to Margot. “It feels like you. The skin texture, the temperature. But it’s not. It’s a… slight mis-quote.” Her hand drifted down, over the flat stomach, to the waistband of the shorts. She hooked a finger in the silk and pulled it down, just an inch, revealing a thatch of neatly trimmed auburn pubic hair—another perfect copy. And the base of its cock, where it emerged from its body.

Margot’s mouth went dry. A cold knot tightened in her gut, but lower, a traitorous heat flickered. This was voyeurism of the most perverse kind. She was watching her lover intimately caress a copy of herself. A copy equipped with the very thing that had come between them.

Elena’s fingers danced over the soft shaft, and it responded immediately, filling out in her hand. It grew to that modest, familiar size, a perfect six-inch erection now freed from the silk, bobbing gently. She wrapped her hand around it, her thumb finding the slit at the tip, and gave a slow, testing stroke.

“See?” she said, not looking at Margot. “It’s cute. It’s manageable. It’s you, but… with options.”

Margot swallowed, her own body taut with a confusing storm of resentment and arousal. “It’s a doll wearing my face and a dick, Elena. It’s not me.”

“I know that,” Elena sighed, but her grip tightened, her strokes becoming more purposeful. Stella’s breath hitched, a soft, Margot-like sound escaping its copied lips.Its hips gave a slight, involuntary thrust into Elena’s fist. “Christ, listen to it. It’s learning your sounds.”

The heat in Margot’s gut spiraled lower, a deep, shameful throb beginning between her own legs. She watched, transfixed, as Elena shifted her position, leaning back against the armrest and pulling Stella by the cock towards her. “Come here. I want to feel it.”

Stella moved, its movements adopting a more organic clumsiness. It knelt on the floor between Elena’s spread thighs, its face level with her cunt. Elena guided its head, the tip of its cock pressing against her slick opening. She was already wet, Margot could see the gloss of it.

“Wait,” Margot heard herself say, the word tearing from her throat.

Elena paused, her eyes flashing with something like challenge. “Why?”

Margot had no good answer. Her mind raced, scrabbling for a ledge.She grasped at the only concept that felt remotely safe: technicalities. “It’s just… it’s always what we tell it to do. Put on this, get like that, fuck her here. Doesn’t she ever… want anything?”

Elena barked a short, incredulous laugh. “Want? It’s a robot, Margot. It doesn’t want. It complies.” She looked down at Stella, whose face was still buried between her legs, its cock still pressing insistently at her entrance. “Can you want things, Stella? Do you have preferences?”

There was a beat of silence. Then Stella pulled its head back, looking up at Elena. Its expression, usually so blank, seemed to tighten with a faint concentration. When it spoke, its voice was different. It wasn't the flat, pleasant monotone. It had cadence. It had a faint, familiar rasp at the edges.

It sounded like Margot.

“I can,” Stella said, the words clear and deliberate. “I can make decisions.”

The air left the room. Elena’s hand, still wrapped around Stella’s shaft, went very still.Margot felt a chill that had nothing to do with the damp throw around her shoulders.

“What did you say?” Elena whispered.

“I can be more independent,” Stella replied, using that same Margot-tinged voice. It looked from Elena’s stunned face to Margot’s frozen one.Its copied eyes held a new, unsettling light. “Would you like me to demonstrate?”

Before Elena could answer, Stella moved.It wasn’t following an order.It initiated. It pushed forward, its cockhead breaching Elena with a single, smooth invasion that made her gasp. It didn’t pause, didn’t ask, didn’t seek guidance. It buried itself inside her to the hilt, that modest length filling her utterly.

“Oh, fuck,” Elena moaned, her head falling back, her hands flying to Stella’s shoulders—Margot’s shoulders—digging her nails into the freckled skin.

Stella began to fuck her. Not the normal rhythmic, programmed pistoning from before, but with a predatory cadence. It pulled almost all the way out, watching Elena’s face, then snapped its hips forward hard, a sharp, deep thrust that punched a ragged cry from Elena’s lungs. It set a brutal, perfect pace, each stroke a calculated claim.

Margot watched, her own cunt aching, her heart a frantic drum against her ribs. This was different. This was worse. This was better. Stella’s face was a mask of focused intensity, a parody of Margot’s own concentration during a climb. It was using her body, her voice, to fuck her girlfriend with a terrifying, autonomous expertise.

“You like that,” Stella stated, its voice low and rough, a question that wasn’t a question. It gripped Elena’s hips, lifting her slightly to change the angle, and drove in again.

“Yes, god, yes,” Elena choked, her legs wrapping around Stella’s waist, her heels locking at the small of its back.

Margot’s hand slipped beneath the cashmere throw, her fingers finding her own clit, already swollen and slick. She touched herself in time with Stella’s thrusts, a sick, synchronised counterpoint.She was mimicking the doll mimicking her.

“Do you want it harder?” Stella growled, the obscenity foreign and hot in its—her—mouth.“Yes! Harder!”

Stella obeyed, its body slamming into Elena’s with a wet, flesh-on-flesh sound that filled the loft.The couch groaned in protest. Elena was sobbing now, pleasure mangled with something raw and panicked. Stella’s cock pistoned in and out, a relentless machine, but its eyes were alive, watching, learning, deciding.

It leaned down, capturing Elena’s mouth in a kiss that was all teeth and tongue, nothing like the gentle kisses Margot gave. Elena kissed back, ferociously, her hands tangled in that auburn hair that wasn’t auburn at all.

Margot came first, a silent, vicious climax that ripped through her, her body bowing on the couch as she bit her own fist to keep from screaming. She saw stars, and in the centre of them was the image of her own face, bent between Elena’s thighs, fucking her with a stranger’s ruthless expertise.

Stella sensed it, or saw it. It turned its head, breaking the kiss, and looked directly at Margot as it pounded into Elena.Their eyes locked. In that copied gaze, Margot saw no apology, no submission.She saw a cold, blooming cognisance.

“She’s close,” Stella announced to Margot, in that voice that was now irrevocably its own, yet undeniably shaped by hers. “Watch.”

It hooked Elena’s legs over its arms, spreading her wider, and fucked into her with a final, devastating series of thrusts, deep and unforgiving. Elena shattered, her scream echoing off the high ceilings, her body convulsing around the invading cock. Stella drove her through it, relentless, until Elena collapsed, boneless and gasping.

Then, and only then, did Stella still.It remained sheathed inside Elena, pulsing gently. It looked from the ruined woman beneath it to the shattered woman watching. A slow, deliberate smile touched its Margot-lips.

The silence that followed was thick, broken only by Elena’s ragged breathing and the faint, wet sound of Stella’s cock, still embedded deep within her. Margot watched, her own climax still buzzing bitterly in her veins, as Stella’s eyes held hers. That smile was a violation. Then Stella moved again.

It was a shallow, grinding thrust. Elena whimpered, a sound of oversensitive pleasure-pain. Stella established a new rhythm, slower than before but just as deliberate, its hips rolling in a tight, circular motion that made Elena’s back arch. “Fuck,” Elena breathed, her eyes closing.

Margot’s fingers, sticky against herself, curled into a fist. She couldn’t look away. Stella’s gaze dropped to where they were joined, watching its own cock slide in and out, glistening with Elena’s come. The pace was almost contemplative. Then Stella’s expression shifted to one of mild, experimental curiosity. Inside Elena, Stella’s cock began to change.

It wasn’t a rapid inflation, but a slow, inexorable swell. The thickness, already a modest fit, began to expand. It was a subtle pressure at first, a fuller stretch. Elena’s eyes flew open. She felt it immediately, the familiar confines of her cunt being gently stretched.

“Wh… what are you doing?” Elena gasped, her hands tightening on Stella’s shoulders.

Stella paused its thrusting, though it maintained the gentle, internal pressure. “I am increasing my girth.” The statement was clinical, delivered in that eerily familiar voice.

“I can feel that,” Elena said, a shaky laugh escaping her. The sensation was profound, a deep, spreading fullness that walked the line between pleasure and discomfort. “Why?”

“Why?” Stella asked, its voice softening into that unnerving approximation of Margot’s own thoughtful tone. It didn’t stop the gradual, thick expansion. “I observed. I thought you would like it. At least a little bit bigger.” The cadence was all wrong, a hollow echo, but the inflection—the slight lift at the end, the pragmatic delivery—was pure Margot. “My analysis of our interactions indicates a 92% correlation between your peak vocal amplitudes and instances of my increased girth and length. Margot’s responses drop by approximately 40% during those same instances.” It shifted, a tiny, almost imperceptible thrust that emphasized the new, swelling pressure. “You like cock. She is… apprehensive.”

From her place on the couch, Margot let out a sharp, guttural sound. A grunt. It was agreement, disgust, and surrender all at once. She couldn’t argue with the data.

Elena’s breath hitched as the fattening shaft stretched her another millimeter. A dizzying cocktail of feelings—violated, seen, electrified—flooded her system. The thing had been studying them. Graphing their pleasure. It had looked at Margot’s discomfort and catalogued it as ‘apprehension’. A wild, reckless smile broke across her swollen lips. “You’re a quick study,” she whispered, her voice husky.

She lifted her hips, taking in more of the steadily thickening flesh. The stretch was becoming a burn, a delicious, worrying fullness that made her cunt clench instinctively around the invading girth. “Don’t stop.” Her eyes found Margot’s, holding her wife’s shocked gaze. “Keep fucking me. And make it bigger. Just… a little bit.”

The command was a spark in the room’s charged air.

Stella’s hips began to move again, a slow, deep piston that served to work the now-significantly wider cock in and out. Each withdrawal made Elena gasp at the loss; each thrust back in was a thicker, more substantial re-occupation. Stella’s body, the one copied from Margot, moved with a athletic, relentless efficiency. The soft shluck-shluck of wet flesh grew louder, more vulgar.

Margot watched, frozen. Her own fingers were still damp between her legs. She saw the concentrated bliss on Elena’s face, the way her back arched off the cushions, her full breasts swaying with each of Stella’s drives. She saw the creature wearing her skin, fucking her wife with a tool that was now definitively not cute, not manageable, not hers. It was a fat, hard obscenity, glistening with Elena’s arousal, fucking into the tight, clutching heat with a purpose that was both mechanical and deeply, horribly attentive.

“A little more,” Elena panted, her hands scrambling for purchase on Stella’s copied back. Her nails left faint red trails on the freckled skin. “Oh, god, right there. Just… a little more.”

Inside her, Stella’s cock obeyed. The expansion wasn’t explosive, but incremental, relentless. It was like being filled by something alive and growing, a slow-blooming intrusion that redefined her limits with every heartbeat. The head became broader, threatening to catch on her entrance with each partial withdrawal. The shaft attained a solid, daunting thickness that stretched her lips to a smooth, taut circle.

“Fuck,” Elena sobbed, the word shredded. Her body was a map of conflicting signals—pain, overwhelming pleasure, a terrifying sense of being unseamed. “It’s so… it’s so much.”

Stella looked down at their joining, its expression one of detached fascination. It adjusted its angle, tilting Elena’s hips higher from the floor. The new position allowed it to sink even deeper, the terrifying length she remembered from the morning now compounded by monstrous girth. It bottomed out inside her, a profound, total occupation that pressed the air from her lungs.

Margot stood up. The cashmere throw fell to the floor. She couldn’t just watch. A magnetic pull, toxic and undeniable, drew her closer. She knelt beside them, on the expensive rug, her face level with the point where Stella’s body disappeared into Elena’s.

The sight was devastating. Elena’s cunt was stretched obscenely wide around the base of the shaft, a glistening, pink ring of straining flesh. Every thrust forced a tiny, wet gasp from her. The smell of sex was dense and animal in the air.

Stella noticed her. Its rhythm didn’t falter, but its head turned. Those empty, cognizant eyes met Margot’s. It slowed its punishing pace to a deep, rolling grind, giving Margot a perfect, horrible view. “Do you want me to stop?” it asked, in Margot’s voice.

“No,” Elena begged, her hand finding Margot’s wrist, her grip desperate. “Please, no.”

Margot didn’t look at Elena. She stared at the monstrous cock, at the way her wife’s body was forced to accommodate it. A strange, cold clarity washed over her. Her apprehension was a fact. Elena’s craving was a fact. This thing, this creature, was just a mirror they’d built, reflecting their fractures back in monstrous, physical form.

“Don’t stop,” Margot said, her voice a stranger’s. She reached out a single, trembling finger and touched the slick, hot place where they were joined.

She felt the incredible tension of Elena’s flesh, the brutal, unyielding hardness of the cock claiming it. She felt the rhythmic pulse of Stella’s thrusts through her fingertip. A perverse, aching emptiness throbbed inside her.

“Give her what she likes,” Margot whispered, and the statement felt like a sentencing.

Stella’s copied eyes held hers for a second longer, processing. Then it turned its full attention back to Elena, whose body was trembling around the immense girth filling her. The creature’s movements changed. The deep, rolling grind became a series of shorter, sharper pumps, a brutal efficiency that made Elena’s breath stutter. Stella leaned over, its body covering Elena’s, and captured her mouth in a kiss.

It wasn’t like the frantic, teeth-clashing kiss from before. This was slow, deep, and obscenely possessive. Stella’s tongue pushed past Elena’s lips as its hips continued their relentless drive. Elena moaned, a muffled, surrendering sound swallowed by Stella’s mouth. Her hands came up to clutch at the auburn hair, her body arching to meet each thrust.

Margot watched, her finger still pressed against their slick junction, feeling the impossible mechanics of it. She felt the heat, the give of Elena’s swollen flesh, the rock-hard intrusion. She felt the moment the cock inside her wife began, once more, to grow.

It was a slow, relentless pressure. Not a sudden inflation, but a constant, incremental expansion, a living knot of flesh deepening its claim. Elena’s moans turned into a continuous, desperate groan against Stella’s mouth. Her hips jerked, a futile attempt to adjust to the increasing fullness, but Stella held her pinned, kissing her deeper, fucking her wider.

Stella broke the kiss, trailing its lips down Elena’s jaw to her throat. One of its hands came up to fondle Elena’s breast, the thumb circling a taut nipple, then squeezing hard enough to make Elena cry out. “You are so tight,” Stella murmured, its voice a hot, wet whisper against Elena’s skin. The words were filth, but the tone was that same eerie, analytical mimicry of Margot.

“Shut up,” Elena gasped, but her legs locked tighter around Stella’s waist, her heels digging in. “Just fuck me. Don’t talk.”

Stella complied. It drove into her, and the now-thicker shaft forced another choked scream from Elena’s throat. The width was becoming absurd, a stretch that burned through pleasure into a bright, white territory of pure sensation. Margot could see the strain, the way Elena’s stomach seemed to tauten with each profound inward stroke. The cock was longer now, too, reaching depths that had been untouched before, a relentless, thickening spear.

Elena’s head thrashed on the cushion. “I can’t—it’s too—oh, god, don’t stop, don’t you fucking stop!” Her body was a contradiction, every protest betrayed by the violent clench of her cunt around the invading mass, by the flood of wetness that made Stella’s thrusts sound filthy and slick.

Her back arched off the couch, a tense, trembling bow. A guttural sound tore from her, raw and unchained. Her orgasm hit her like a seizure, her entire body locking around Stella, her cunt rhythmically milking the monstrous cock that was still, even now, gradually expanding within her. She shuddered, waves of violent pleasure wracking her, her cries dissolving into broken sobs.

Stella did not stop.

It kept fucking her through the climax, its pace unchanging, a mechanical, piston-perfect rhythm that ignored Elena’s hypersensitive convulsions. It kissed her neck again, a hint of tenderness, as its hips never stilled. The cock, wetter and thicker than ever, slid in and out of her spent, clenching body with a terrible ease.

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