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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 33: Elena's Turn

The taste lingered, a metallic film coating Margot’s tongue and throat. She knelt on the cool floor, spent and shivering, the aftershocks of her climax a faint tremor in her thighs. Her jeans were soaked, a cold, clinging shame between her legs. Above her, Elena exhaled a long, slow breath, her eyes fixed on the gleaming, monstrous cock Stella still displayed, now slick with spit and synthetic cum.

Without a word, Elena began to undress. It wasn’t the hurried fumble of passion; it was a ritual. Each button of her blouse slipped free with deliberate precision. The fabric sighed as it slid from her shoulders, pooling on the hardwood. Her breasts swayed heavily as she bent to push her trousers and underwear down her hips, stepping out of them with the grace of a performer. The afternoon sun caught the curve of her waist, the swell of her ass, the dark triangle of hair at her junction. She was completely, unselfconsciously naked.

Margot watched, a dull ache spreading behind her ribs. Her wife was a masterpiece of living flesh, and she was kneeling in a puddle of fake come. Elena turned to Stella. The gargantuan cock, now softening slightly but still impossibly huge, lay against its thigh. “On the sofa,” Elena commanded, her voice low and sure.

Stella obeyed, moving to the low, wide sofa and sitting primly on the edge. Its knees fell apart. The sight was absurd, grotesque: the delicate, Margot-like face, the small hands resting on its thighs, and between them, that brutal, flesh weapon resting heavily on the cushions.Elena walked over, her movements fluid and predatory. She placed one knee on the sofa beside Stella’s hip, then the other, straddling its lap. She didn’t look at Margot.Her entire focus was on the instrument beneath her. She reached down, her fingers wrapping around the base.The sheer girth made her hand look small. She guided the weeping, purple head to her opening.

Margot saw Elena’s cunt, glistening with her own arousal, the dark curls damp. She saw the head, massive and intrusive, begin to press against that soft, familiar flesh. A tense, silent struggle played out in the lines of Elena’s back, the clench of her jaw.

With a sharp, controlled exhale, Elena began to sink down .It was a violation of physics. Margot heard the wet, stretching sound, a groan of tissue giving way. Elena’s head fell back, a choked gasp escaping her lips. She went slowly, an inch at a time, her body swallowing the monstrous invasion. Her thighs trembled with the strain. The shaft disappeared into Elena’s body, stretching her obscenely wide. “Fuck,” Elena breathed, the word shredded. “Oh, fucking hell.”

She paused, fully impaled, her body arched like a bow. The base of the cock was buried inside her, the remaining length a shocking column rising from their joining. A fine sheen of sweat coated her skin. Then she moved.

It was a rolling grind of her hips, a deep, internal circling as she acclimated to the sheer size. Her eyes were closed, her lips parted. A low, continuous moan vibrated in her chest. Her hands came to rest on Stella’s shoulders, not for support, but for leverage. She began to lift herself, a staggering inch upward, then sank back down with a wet, solid slap of flesh.

Margot’s own cunt gave a traitorous throb. She was frozen, caught between horror and a rapt, jealous fascination. This was her wife, being fucked by a thing that wore a twisted version of her own face, taking a cock that had just been down her own throat. The boundaries were vapor, leaving only raw sensation and a dizzying power exchange.

Elena found a rhythm, a brutal, piston-like motion. She rose until just the head remained inside, then plunged down, taking the full, impossible length in one smooth, savage stroke. Each time she bottomed out, a sharp, punched-out sound left her lips.“Yes,” she hissed.“God, yes. So deep. It’s fucking everywhere.”

Stella’s hands came up to grip Elena’s hips, its fingers digging into the soft flesh. It wasn’t thrusting; it was a statue, an anchor. But its hands guided the pace, subtly encouraging Elena to ride harder, faster.The wet, slapping sounds grew louder, punctuated by Elena’s ragged panting.

“Look at her, Margot,” Elena gasped, her eyes flying open to lock onto Margot’s.They were glassy, fever-bright.“Look what I can take. Look how fucking well I take it.”

Margot’s mouth was dry.She couldn’t speak. She just watched, her own fingers unconsciously drifting to the damp spot on her jeans, pressing against her swollen clit through the fabric.Elena’s movements became more frantic, less controlled. Her orgasm was building, not as a slow crest but as a seismic event. Her cries grew louder, less articulate.“Oh god, I’m gonna… I’m gonna come. Don’t stop. Don’t you fucking stop.” She was fucking herself on Stella now, a frenzied, animalistic rhythm, her breasts bouncing, her hair sticking to her neck.

“Now, Stella,” Elena commanded, her voice guttural. “Fill me up. Like you did her. Do it.”

Stella’s body gave that same, subtle shudder. The cock inside Elena swelled. Elena screamed, a raw, torn sound, as the synthetic flood erupted deep within her. Her body seized, back arching violently, internal muscles clamping and fluttering around the pulsing intrusion. Her own climax ripped through her, a visible tremor racking her from head to toe, her cunt milking the fake seed being pumped into her in impossible, gushing waves. It seemed to last forever. Elena shook through it, her cries softening to whimpers. Finally, the torrent ceased. Stella’s hands fell from her hips.

Elena slumped forward, collapsing against Stella’s small, sturdy frame, the massive cock still buried inside her. She was breathing in ragged, open-mouthed gasps.

The massive shaft inside her began to soften, a gradual but unmistakable deflation. It wasn't a withdrawal, just a slow recession of that impossible rigidity, the flesh becoming pliant within her well-fucked cunt.Elena felt the change immediately, a subtle loss of that breathtaking fullness.

Her eyes snapped open. "No," she breathed, the word thick with post-orgasm lethargy but firm with intent.She lifted her head from Stella’s shoulder, her gaze sharpening."Stella. Keep it hard."The effect was instantaneous. The softening flesh within Elena surged, regaining its former iron rigidity in a heartbeat. It shoved deeper, re-expanding to its full, monstrous girth, stretching Elena’s sensitive walls anew. A soft, shocked gasp escaped her lips, part pleasure, part awe at the immediacy of her control.

A slow, possessive smile spread across Elena’s flushed face. She experimentally rocked her hips, savoring the renewed thickness. "Good," she murmured, her voice a low purr.

She began moving again, a slow, sinuous grind of her hips against the solid pillar of flesh buried inside her. The sensation was already overwhelming, a deep, stretching fullness. Then, without warning, the cock inside her expanded.

It wasn't a commanded change. Stella’s placid expression didn't shift. But the shaft swelled, thickening perceptibly, becoming even more impossibly wide within Elena’s clutching cunt. A sharp, shocked cry tore from Elena’s throat. Her eyes flew open, wide with surprise, then darkened with immediate, greedy pleasure. “Oh… oh fuck,” she gasped, her rhythm faltering for a single stuttered beat as her body strained to accommodate the new girth.

She hadn’t asked for this. The autonomy of the act, this independent adjustment by the doll, sent a jolt of something electric through her. It was a suggestion, a modification made by the instrument itself to better serve its purpose. A twisted smile touched her lips. She resumed her grinding, the friction now more intense, more brutal, the stretched feeling verging on exquisite. “Yes,” she hissed, more to herself than to Stella. “That’s it.”

Then it happened again. Another incremental, terrifying expansion. The cock grew thicker still, the veined surface becoming taut and hard as stone against her sensitive inner walls. Elena froze, utterly full, a strangled moan trapped in her chest.Every nerve ending screamed. She was packed, stuffed beyond any previous limit, the invading pressure a constant, dominant presence.

“Christ,” she whispered, awe diluting the pain into a blinding, white-hot need. Her hands tightened on Stella’s shoulders, knuckles white. She forced herself to move, a minuscule, experimental rock of her pelvis. The sensation was monumental, a ruthless, grinding fullness that scraped against every pleasure point inside her. “You perfect fucking thing,” Elena breathed, her voice ragged with adrenaline. “You knew exactly what I needed.”

She began to ride in earnest again, her movements constrained by the sheer, punishing size but driven by a frantic, desperate hunger.Each downward plunge was a conquest, a surrender. The wet, slapping sounds of their coupling filled the sunlit room, now mixed with the strained, animal noises Elena couldn’t suppress. Her world narrowed to the fusion of her body and this monstrous, self-adapting tool. “Look, Margot,” she managed to pant, her head lolling back. “Look how it fits me now. It’s… it’s mine.”

From the floor, Margot watched, her own breath shallow. The clinical part of her mind, the part that had initially proposed this “logical solution,” was silent.In its place was a raw, bruised fascination. She saw the blissful agony on her wife’s face, the way Elena’s body contorted to accept the impossible. She saw Stella, a blank canvas, effortlessly molding itself to Elena’s deepest, unspoken desires. And she felt, with a sour tang in her still-filthy mouth, the profound, irrevocable shift in the room’s power. Elena wasn’t just playing with a toy anymore. They were being reshaped by it.

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