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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 38: Cuddle Time

The shuddering aftershocks in Margot’s body were just subsiding when Stella began to withdraw. It was a reverse of the earlier, brutal slowness, but now it felt clinical, like the extraction of a medical probe.

Margot gagged, her throat spasming around the shrinking circumference as it retreated. Her jaw ached with a deep, bone-deep soreness. Finally, with a slick, obscene sound, the last of it slipped from her bruised lips. She collapsed onto her side, coughing, drawing in huge, ragged lungfuls of air that tasted like come and ozone. Strings of spit and precum connected her mouth to the glistening tip, now hovering inches from her face.

Elena hadn’t moved from her kneeling position.Her eyes were locked on Stella’s cock. It was still enormous, still a shocking twenty-two, twenty-three inches of thick, veined flesh, but it was visibly retracting, shrinking back toward its default state.“No,” Elena breathed. The word was soft but sharp, a curator halting the restoration of a painting she preferred in its raw, damaged state. “Stop.Don’t shrink.”

Stella’s adaptive processes paused immediately. The cock remained at its post-orgasmic size, heavy and semi-flaccid, dripping onto the sheet between Margot’s legs.

Elena crawled forward, her own arousal forgotten in a surge of pure, acquisitive curiosity. She reached out a tentative hand, her fingers not quite touching the hot, slick skin.“Can you make it bigger than that? Right now?”

“Organic polymer expansion is possible within structural limits,” Stella stated, her head tilting slightly.

“Do it,” Elena whispered, her eyes gleaming. “Just… keep making it bigger.”

A faint, almost serene smile touched Stella’s enhanced-Margot lips. It was an expression Margot herself never wore, a placid acceptance that was utterly alien. Then, beneath Elena’s gaze, the cock began to change.It wasn’t just lengthening this time. It thickened first. The already considerable girth expanded, the vascular patterns on its surface stretching, becoming more pronounced. Elena watched, mesmerized, as its diameter surpassed that of a soda can, then a large beer can.The sheer mass of it was terrifying. It lengthened more slowly now, a heavy, growing weight, rising toward her sternum.

“Holy fuck,” Margot croaked from the bed, her voice wrecked. She pushed herself up on one elbow, wiping her mouth with the back of her hand. The pragmatic part of her brain, struggling back online, whispered about tensile strength, about the physics of such a thing. It was obscenely impossible. It curved upward slightly, a fleshy monolith, the head now level with Stella’s collarbone. It had to be two feet long. Maybe more.

Elena was panting, her lips parted. “Keep going,” she urged, her voice husky with a strange mix of command and awe.“Don’t stop.”

Stella’s smile remained. The growth continued.The cock ascended past the base of her throat, its tip now brushing her chin. It thickened further, becoming truly monstrous, the skin taut and gleaming under the lights. The sheer scale of it ceased to be erotic and became something else—a biological sculpture, a piece of visceral, living architecture.

It rose past her lips, her nose, and finally, the broad, swollen crown levelled with the top of her auburn hair. It stood there, a pillar of flesh as thick as a two-litre bottle, impossibly long, casting a faint shadow on the far wall. The adaptive surface had maintained its perfect, flushed-pink hue, the details of the coronal ridge and the slit at the tip rendered in terrifying, hyper-realistic detail.

The room was silent except for the low hum.Elena stared for a long moment, her mind scrambling to catalogue it. Then, with a movement that was almost reverent, she shifted. She didn’t reach for it with her hand. Instead, she lay down on her back on the floor beside the bed, aligning herself with the colossal shaft.She turned her head and pressed her cheek against its hot, smooth surface.

“Elena,” Margot whispered, a warning and a question.Elena ignored her. She nuzzled against the side of the cock, then wrapped her arms around its girth. Her fingers couldn’t come close to touching. She hugged it like a lover, or like a child clinging to a tree trunk. She pulled herself closer, burying her face against it, then shifted, sliding her body so the immense weight of it settled between her breasts. She squeezed them together around the base, the soft, heavy curves of her flesh enveloping a mere fraction of the shaft.

“It’s warm,” she murmured, her voice muffled against the skin. “It’s so… real.” She turned her head and kissed it, a soft, lingering press of her lips. Then she looked up at Stella’s face, still smiling its empty smile. “Can you feel this?”

“Yes, I can feel it,” Stella replied.

Elena closed her eyes, rubbing her face against it. She was embracing an idea, a manifestation of pure, customizable lust. Margot watched from the bed, the ache in her jaw secondary to a colder, sharper feeling settling in her chest.This wasn’t the playful control of a toy. This was something else. Elena was communing with the thing they’d made, lost in a private fascination that completely excluded her.Margot swung her legs off the bed, her body protesting. She stood, a little unsteady, and walked around the monumental obscenity that had grown from their companion. She stood over Elena, who still clung to the giant cock, her eyes closed.

“Elena,” Margot said, her voice stronger now.

Elena opened her eyes. They were dark, glazed with a possessive wonder.“Look at it, Margot.We made this. It’s incredible.”

“It’s a party trick,” Margot said, but the deflection fell flat, sounded hollow even to her.“A physiological impossibility rendered by advanced biotech. It’s not…” She trailed off, not knowing what she wanted to say. It’s not us.

“It’s whatever we want it to be,” Elena corrected softly, tightening her hold. She looked at Stella.“Can you move it? Gently.”

Stella gave a slight, forward tilt of her hips. The massive shaft, nestled between Elena’s breasts, pushed forward a few inches with a smooth, hydraulic grace. The movement made Elena gasp, the weight and heat a profound, crushing presence on her sternum.“Again,” Elena breathed.

It moved again, a slow, steady advance that pushed her breasts tighter together, the flesh bulging around it. Elena let out a soft moan, her head falling back against the floorboards. She wasn’t being fucked; she was being engulfed.A human subsumed by the creation.Margot turned away. The sight was too much, a beautiful, horrible painting she hadn’t intended to commission. She walked to the frosted glass window, pressing her forehead against the cool pane. The city lights blurred into smears of gold and white. Her reflection was ghostly, transparent, overlaid on the urban grid.

She heard Elena’s whispers, the wet, soft sounds of her kissing the monstrous thing, the quiet, servoed movements. The intimacy of it was absolute, and it was an intimacy from which Margot was shut out.She had proposed this. She had coded the parameters, approved the organic substrates.She had joked about spicing things up. This was the logical end point of that trajectory, and it felt like watching Elena drown in a sea of their own design.

After a long while, the sounds stopped.

“You can stop now, Stella,” Elena said, her voice thick with unspent emotion.“Return to default.”

Margot didn’t turn around. She heard the faint, organic rustle of rapid transformation, the sound of a monument being dismantled. When she finally looked, Stella was standing politely by the bed, her cute, five-inch cock resting demurely against her thigh. Elena was sitting up on the floor, her knees drawn to her chest, looking dazed and spent.The loft felt too large, too quiet.

“Well,” Margot said, forcing a tone of wry observation into her ravaged voice. “That was… scalable.”

Elena looked at her.The wonder was gone from her eyes, replaced by a sudden, sharp vulnerability. “Did you not…? I thought you were into it.”

“I was,” Margot said, too quickly.“It was intense.A lot.” She walked over, offering a hand to help Elena up. Elena took it, her grip warm and firm. “I just… I need a glass of water.My throat’s fucking destroyed.”

She fled to the kitchen, not waiting for a reply. Under the bright, cold LED strips, she filled a glass and drank, the water feeling like razors.She stared at the sophisticated espresso machine, the clean lines of their minimalist kitchen. Everything was under control here.Everything had its place.

Elena padded in a few minutes later, wrapping herself in a silk robe.She leaned against the counter, watching Margot.“You shut down,” Elena said quietly. “After. You always do.”

“I don’t shut down,” Margot countered, avoiding her eyes.“That was a lot to process.”

“It’s okay if it freaked you out.”

“It didn’t freak me out,” Margot insisted, the technical detachment a flimsy shield. “It was a fascinating test of the system’s adaptive limits.The hydraulic pressure alone required to maintain tumescence at that volume must be incredible. The neural feedback loop for somatic sensation…”

“Margot.” Elena’s voice was soft but it cut through the jargon.“Stop.Tell me what you felt. Really.”

Margot put the glass down.She stared at her own chipped nail polish, a practical black. “I felt… incidental,” she said finally, the words surprising her with their truth.“Like a… a spectator. Or a fuel source.You were somewhere else with it. With her.”

Elena was silent for a moment.Then she stepped closer, her scent enveloping Margot—jasmine and sex and sweat. “I was exploring,” she said.“It’s a new medium. But the exploration… it’s only interesting because I get to come back and tell you about it.” She cupped Margot’s jaw, her thumb brushing over the sore muscles.“You’re my gallery. Not that thing.”

Margot leaned into the touch, the simple humanity of it almost bringing tears to her eyes.She nodded, unable to speak.

Elena’s gaze drifted over Margot’s shoulder, toward the bedroom. “We should power her down for a few days,” she said, the decision seeming to form as she spoke it. “Let things… settle back into our own shapes.”

The relief that flooded Margot was so profound it felt like weakness.“Yeah,” she rasped. “Yeah, okay.”

But later, as Elena slept curled into her back, Margot lay awake. Her mind wouldn’t stop cycling back to the image of Elena’s face, beatific and entranced, pressed against that inhuman flesh.The whispered command: Keep going.

They had unlocked a door. Margot had a nagging, chilling certainty that even if they powered Stella down, even if they put her in storage, that door would remain open, waiting in the silence of their sleek, sunlit loft. And she wasn’t sure which of them would walk through it next.

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