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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 20: Realization

The grey dawn light filtered through the blinds, striping the rumpled white linen in pale bands. Margot woke to a familiar warmth at her back—Elena’s soft, sleeping form curled against her—and an unfamiliar weight across her legs. She blinked, the previous night’s silence, thick and unresolved, still clotting the air of the bedroom. She shifted slightly. The weight moved. It was warm, heavy, and impossibly firm. She looked down.

Stella lay on the other side of Elena, its enhanced female form serene in sleep, its face a mask of perfect placidity. Draped across Elena’s bare thigh and touching Margot’s own leg was its cock. It was flaccid, but ‘flaccid’ was a grotesque misnomer. It was a length of thick, smooth flesh, resting like a sleeping python, the bulbous head nudging Margot’s knee. Even relaxed, it was longer than any erect human penis she had ever seen—a good eighteen inches of dormant, shocking potential. A sour taste flooded her mouth. Her own arousal from the night before felt like a distant, shameful memory.

Elena stirred, her hand sliding down her own stomach in a sleep-softened gesture. Her fingers brushed the base of Stella’s cock where it met its body. Then, as if guided by a dream, her hand closed around the shaft.She sighed, a contented sound, and began to absently stroke.

Margot watched, paralyzed. Beneath Elena’s touch, the flesh stirred. It twitched, a slow, visceral undulation, and began to swell. The thickening was obscene. It pushed up against Elena’s thigh, rising, gaining girth and length in a silent, relentless inflation. It was like watching a time-lapse of some monstrous plant growing, but warm and pulsing with a false life. Elena’s eyes fluttered open. She didn’t startle. She simply watched her own hand, now struggling to encircle the widening shaft, with a detached, scientific curiosity. The cock continued to harden, reaching full, absurd erection, the veined thickness of it straining upwards. The tip hovered near Elena’s chin, a blatant, glistening threat. “Fuck,” Elena breathed, her voice morning-rough. She wasn’t addressing Margot. She was talking to the object in her hand. “It’s even bigger. It kept growing.”

“Yes,” Stella’s neutral voice came from the other side of Elena. Its eyes were open, staring at the ceiling. “The parameters were set to allow for continued proportional enhancement based on previous feedback. The tissues are capable of sustained hyperplasia.”

Margot found her voice, thin and cracked. “You told her to keep getting bigger? All night?”

Elena finally looked at her, over the massive, rising column of flesh. There was a challenge there, but also a flicker of something else—fear, perhaps. “I asked how large it could get. It was a question. It seems the answer is… ongoing.” She gave the cock a slow, considering stroke, her hand moving from base to tip in a long, lingering pass. “It’s fascinating. And… fucking hot, I won’t lie. But Christ, Margot, look at it.” A weak laugh escaped her. “I can’t take more of this. Not like last night. That was… a lot.”

A part of Margot unclenched at those words. A brittle relief. She sees it. She knows it’s too much.

But Elena wasn’t finished. Her gaze drifted back to the monstrous cock, a sculptor examining a problematic piece of marble. “But I do wonder,” she murmured, almost to herself, her thumb sweeping over the slick, broad head, “what the limit is. Is there one? Or could it just… keep going?” Her eyes held a hungry, glittering speculation.

The relief in Margot curdled into something cold and hard. This wasn’t about shared pleasure anymore. It was about a frontier. A limit to be tested. Elena was no longer just playing with a toy; she was conducting an experiment, and the experiment was the ruination of their intimacy.

Without a word, Margot threw back the covers and got out of bed.The morning air was cool on her skin. She stood there, naked, feeling exposed and foolish.“Margot,” Elena said, her tone shifting.

“Don’t,” Margot cut her off.She walked to the bathroom, not looking back. She heard the rustle of sheets, Elena disentangling herself from Stella.

The shower was a brief, punishing blast of nearly-scalding water. She scrubbed her skin until it was pink, trying to erase the phantom sensation of that heavy, sleeping weight on her legs, the visual brand of Elena’s hand on that impossible flesh.

When she emerged, wrapped in a towel, Elena was waiting by the sink. Stella stood motionless by the bed, its shocking erection now softening slightly, but still a dominant, ludicrous presence in the room.“We need to talk,” Elena said. Her arms were crossed over her breasts, a defensive posture.

“Do we?” Margot’s voice was flat.“You seem to have everything under control.Your parameters.Your feedback loops. Your… ongoing research.”

“Don’t do that,” Elena snapped. “Don’t use that clinical tone with me.You’re the one who brought it into our home! You’re the one who said it was a tool for us. Well, I’m using it.”

“You’re warping it!” Margot’s control snapped. The words burst out, loud in the tiled room.“You turned it into a fucking carnival sideshow!Look at it, Elena! That’s not a person.That’s not even a sexy fantasy anymore. That’s a… a biological atrocity!And you’re lying there wondering how much bigger it can get? What is wrong with you?”

Elena’s face flushed. “What’s wrong with me?You stood there last night and watched.You were turned on.I saw your hand. Don’t you dare pretend you were above it.”

The truth of it was a slap. Margot’s jaw tightened.“I was horrified.And yes, part of me was… aroused. That’s what makes this so fucking sick. You’ve created something that bypasses every rational thought, that taps into some lizard-brain fuckhole, and you’re using it to blow up our bed!”

“Our bed was already cold!” Elena shouted, her eyes blazing. “You were the one who noticed!You were the one who needed a solution! Well, here’s your solution, Margot!It’s adaptable!It’s whatever we need! And right now, maybe what I need is to not feel guilty for wanting to be utterly fucked into oblivion by something that can’t judge me, can’t get tired, can’t lose interest!”

The words hung between them, brutal and bare.Margot felt a hollow opening inside her chest. This was the core of it.The spark they’d lost.The fatigue.The quiet disinterest. Stella wasn’t the problem; it was the symptom, the escape hatch. And Elena had plunged through it headfirst.Elena saw the hurt in Margot’s eyes. Her anger deflated, leaving a weary sadness.She uncrossed her arms. “I’m sorry,” she said, quieter. “That was cruel.”

“It was true,” Margot said, her own voice drained.They stood in the humid bathroom, the distance between them feeling wider than the loft itself.

Elena stepped forward.She reached out, her fingertips touching Margot’s bare shoulder. The contact was electric, a jolt of their old, simple chemistry amidst the technological chaos. “I miss you,” Elena whispered.“Not the us with Stella. Just us.”

Margot leaned into the touch, her resolve crumbling.The fight left her shoulders. “I miss us too.”

Elena’s other hand came up, cupping Margot’s cheek.She leaned in and kissed her. It was tender, searching, a probe sent into familiar but recently neglected territory. Margot responded, opening her mouth, the taste of Elena—sleep and salt and her—flooding her senses, overwhelming the sterile shame of the last twelve hours.The towel dropped from Margot’s body. Elena’s hands were on her hips, pulling her closer. They stumbled back through the doorway, onto the cool wooden floor of the bedroom, a frantic, hungry energy replacing the argument. It was a reclamation. A desperate attempt to overwrite the memory of the night before with their own, original script.

They ended up on the rug beside the bed, a tangle of limbs and feverish kisses. Elena pushed Margot onto her back and straddled her, her long black hair creating a curtain around their faces. She kissed down Margot’s throat, her breasts, her stomach, her mouth hot and urgent. Margot arched up, her hands fisting in Elena’s hair, a moan escaping her lips.This was what she wanted.This was real.

Elena’s mouth found Margot’s cunt, and Margot cried out, the sensation direct and unmediated. Elena licked and sucked with a fierce possessiveness, as if trying to erase the ghost of that other, monstrous penetration. Margot bucked against her face, the pleasure sharp and clean, a scream building in her throat.But her eyes were open. Over Elena’s heaving shoulders, she could see Stella. It stood exactly where they had left it, a silent, polished sentinel beside the bed.Its gaze was not directed at them, but its mere presence was a scrutiny. The brutal, inhuman cock, now semi-erect, hung between its legs—a permanent, physical footnote to their current struggle. A reminder of what Elena had asked for, what she had wondered about.The climax, when it ripped through Margot, was intense but fractured. It was marbled with a cognitive dissonance she couldn’t shake. As she gasped, her body vibrating, her eyes locked with the empty, polished ones of the companion across the room.

Elena crawled back up her body, kissing her way to Margot’s mouth, sharing her own taste. “See?” she panted, her eyes shining with tears and triumph. “Just us.”

But it wasn’t.It couldn’t be.Not anymore.Stella was there.Its programming was running. Its growth was ongoing. And the question Elena had asked—how large could it get?—remained, unanswered, hanging in the air between them, more potent than any declaration of love.

Margot held Elena tight, their sweat-slicked skin sticking together, and stared over her shoulder at the construct. The momentum of their fight had crashed into this fragile, temporary truce, but the path forward was obscured, leading deeper into a territory they had created but could no longer control.

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