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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 19: The Stranger's Claim

The key turned in the lock with a sound like a cracking bone. Margot pushed through the door, the strap of her laptop bag digging into her shoulder, her mind still parsing the client’s unreasonable feedback. The loft’s usual quiet was gone, replaced by a thick, rhythmic sound—a wet, slapping percussion and a low, guttural grunting.

She dropped her keys in the bowl.The sound was wrong.

Her eyes adjusted from the hallway’s gloom to the living room’s warm, low light.And then she stopped.Everything stopped.

On the thick, cream-colored sheepskin rug before the dormant fireplace, Elena was splayed. Her long black curls were a wild vortex around her head, stuck to her temples and throat with sweat. Looming over her, conquering her, was a man. A giant. His back was a topography of sculpted muscle, latissimus dorsi flaring like wings with every driving movement, his skin glistening under the amber LEDs. His shoulders were impossibly broad, his hips narrow and powerful. The sound was the brutal, piston-fucking pace of his thrusts, the slick noise of a body being used deeply, ruthlessly. His cock was a monstrosity. It plunged into Elena’s cunt, which was spread obscenely wide around its girth, a stretched, glistening pink ring clutching the shaft. Unquestionably larger than Stella's had been the night before, and it disappeared inside Elena to the hilt with a force that jerked Elena’s entire body upward. Elena’s legs were hooked over his shoulders, her calves dangling, her toes curled. Her hands were not caressing; they were clawing at the sheepskin, gripping fistfuls of white wool. Her face was contorted, mouth open in a silent scream that resolved into a choked, sobbing gasp as he pulled almost all the way out before slamming back in.

“What the fuck?” Margot’s voice sliced the air, thin and sharp.

The rhythm faltered. The man—the thing—turned its head. The profile was classically handsome, a strong jaw shadowed with stubble, a straight nose. But the eyes were flat, empty pools. Stella’s eyes landed on Margot. Then a smirk, cold and calculated, twisted its perfect lips.

“Welcome home,” Stella said, and its voice was a deep, resonant baritone, nothing like Stella’s soft monotone.

Elena’s head lolled to the side, her eyes focusing on Margot through a haze of primal need. There was no shock, no guilt. Only a fierce, defiant heat. “Don’t stop,” she moaned, not to Margot, but to the thing on top of her. “Please, don’t stop.” She bucked her hips, forcing the massive cock deeper, and a ragged cry was torn from her throat.

Margot’s laptop bag slid from her nerveless fingers, hitting the floor with a dull thud. Her own breath was shallow. “You changed her. Into… this?” But the question was weak, hollow. Her gaze was locked on the junction of their bodies, on that terrifying, magnificent cock as it withdrew, slick and gleaming, only to be rammed home again. Elena’s cunt swallowed it, the lips pulled inward, stretched to a breathtaking limit.

A hot, acidic jealousy flooded Margot’s veins, but it was immediately swamped by a darker, more insistent tide. Her own clit throbbed, a painful, insistent pulse. She felt a slickness seep into her underwear. The sight was horrific. It was mesmerizing. It was the most raw, brutally sexual thing she had ever witnessed.

Stella—the man, the construct—didn’t wait for permission. It read Elena’s command as the only one that mattered. One of its huge hands, which had been braced on the rug, snaked down and grabbed Elena’s hip, fingers digging into the soft flesh. The other hand cupped her ass, lifting her slightly to change the angle. Then it began to pound, really pound, each drive of its hips a full-body commitment. Elena screamed. It wasn’t a scream of pain, but of shattering release. “Fuck, yes! Right there, right there, you fucking beast!” Her words were filthy, guttural. Her back arched off the rug, her breasts shaking with the force of the fucking. “Fill me up, come on, give it to me!”

The beast obeyed. Its hips became a punishing machine, each thrust bottoming out inside Elena with a force that made her abdomen bulge slightly. Elena’s screams fragmented into shattered, open-mouthed gasps as her orgasm hit her, a violent seizure that clamped her cunt in rhythmic pulses around the invading thickness. Her heels dug into Stella’s muscular back, her body bowing until only her shoulders and head remained on the rug.

“More,” Elena panted, the word dripping with desperate avarice. Her eyes, glazed and wild, found Margot’s across the room. “Bigger. Stella, grow bigger. More.”

Margot’s stomach lurched. “Elena, no—”

But it was already happening. Stella’s form, already immense, seemed to solidify, its muscles becoming denser, its frame expanding a fraction. The real change was visceral and horrifyingly audible. A wet, fleshy squelch echoed from their joined bodies as the cock inside Elena swelled, thickening, lengthening against the frantic clench of her climax. Elena’s eyes rolled back in her head as a second, more profound orgasm ripped through her, triggered by the sensation of being stretched beyond what seemed possible. She shrieked, a sound of pure, animal abandon, as the growing monstrosity continued to piston into her, the new dimensions filling spaces that had no right to exist.

Margot watched, frozen. Disgust coated her tongue, sharp and metallic. Her own treacherous arousal felt like a betrayal. This was raw, reckless consumption. Elena had not just used Stella; she had warped it into a fuck-toy of cartoonish proportions, all while Margot stood there, her cunt aching and her trust crumbling.

With a final, guttural snarl from Stella’s male persona, the thrusting stopped. It braced itself over Elena’s wrecked, shuddering form. Then, with agonizing slowness, it began to withdraw. The cock that emerged was a revelation of absurd, pornographic geometry. Inch after glistening inch slid out of Elena’s gaping, well-used hole, which remained stretched open long after it had passed. It was thicker than Margot’s forearm, a veined pillar of flushed, hyper-real flesh. Fifteen inches. Perhaps more. It finally cleared Elena’s body entirely, standing fully erect from the giant’s groin, a grotesque monument to Elena’s command. A heavy string of Elena’s come and slick fluid bridged the tip to her ravaged cunt. Elena lay gasping, a slick pool of sweat and exertion beneath her. She turned her head toward Margot, a defensively challenging look in her hazy eyes. “What?” she breathed.

“What the fuck do you mean, ‘what’?” Margot spat, her voice trembling. “Look at it, Elena. Look at what you made Stella.”

“It’s a tool, Margot.” Elena’s voice gained strength, edged with a sharp defiance. “You said it yourself. It’s whatever we need it to be.” She shifted, wincing slightly, and looked up at the monstrous male figure.

“Stella, return to the version Margot made. The one with the enhancements from before. But keep this.” She gestured weakly at the obscene cock. The transformation was silent and swift. The mountainous musculature smoothed away, the broad shoulders narrowed, the jawline softened. Within seconds, the Stella that knelt on the rug was visually female again—the enhanced, fuller-breasted, narrow-waisted version Margot and Elena had sculpted days earlier. Yet, rising from that classically feminine pelvis, the monstrous, arm-thick cock remained, a horrifying contradiction. It was attached to the body Margot had designed, a permanent, brutal fixture.

Stella looked at Margot with its neutral, empty eyes. “Is this acceptable?” it asked in its normal, placid voice.

Margot could only stare, a cold realization dawning alongside the lingering heat in her blood. Elena had just weaponized Margot’s own logic, her own creative control, and the tool they shared. She looked from that serene, familiar face to the unreal penis jutting from it, and finally to Elena’s satisfied, defiant expression. No words came. The momentum of the scene had halted, leaving only the heavy aftermath and a dreadful, unfamiliar silence between them.

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