Sexborg Vixxa
by CreepyUnclePete
Copyright© 2026 by CreepyUnclePete
Science Fiction Sex Story: She's the perfect cyborg girlfriend, with a pretty face, sexy body, and insatiable appetite. Maybe TOO perfect.
Caution: This Science Fiction Sex Story contains strong sexual content, including mt/ft Coercion Consensual Heterosexual Fiction Science Fiction Robot Anal Sex Oral Sex Big Breasts .
“It’s a gift, but if you break it, Zander, you’re paying for the repairs out of your allowance.”
My mother’s voice was clinical, almost bored, as she stepped back to reveal the crate. I didn’t care about the warranties, I wanted to see my mystery gift. Until I pried the wooden box open, all I could see was the name, “Vixxa”
Since Dad passed away years ago, my mother had always been a woman of strange tastes and deep pockets. For my fourteenth birthday, she decided to bypass the gaming console and the bike for something much more adult, that looked like it had been built in a fever dream.
The cyborg lay there, blinking up at me with a look of such profound, wide-eyed cuteness it felt like a physical punch to the gut. The female cyborg. The nude, EXTREMELY female cyborg!
Mom explained, “She has a computer instead of a brain, with titanium bones and robotic muscles, but the rest of her is made of real human cells, natural tissues that feel like a real woman. She needs to eat and drink like people do. She also needs the toilet occasionally.”
She noticed my mild frown and suggested a hot concept I hadn’t thought of, “I’m sure she’ll let you watch. She’ll wash you in the shower, too.”
Vixxa’s face was a masterpiece, the soft round cheeks, little nose, large round eyes, and light pink lips of a girl starting high school, halfway through puberty. As she sat up, the illusion shattered into something far more visceral and copulatory. Below that sweet, angelic face was a body that defied nature: the lithe, toned limbs of a beautiful athlete, topped with breasts so huge and heavy they belonged to a mother of triplets.
There was obvious hunger in those shiny blue eyes, a hunger I shared.
“She has the face and voice of a girl fourteen years old, the body of a professional soccer star, and the breasts of ... well ... you have eyes.”
I did, and stared at the marvelous bare melons attached to her ribcage, with dark pink strawberry-sized nipples!
“You can do nearly anything you want with her,” Mom said, “She’s programmed to obey her lover.” She smirked, leaning against the doorframe, her eyes narrowing with a predatory curiosity. “Anything you want, including anything sexual. The only exceptions are if it would injure one of you, cause property damage, or go against my instructions. Enjoy, try her out. I want to see if the ‘Adaptive Pleasure’ chip I paid extra for is worth it.
Suddenly, the cyborg reached out, her fingers grazing my thigh. Her skin felt like warm silk. “Hello, Zander,” she whispered, her voice a melodic, breathy contradiction to her colossal chest. “I’m Vixxa, and I was built to please your body.” Breasts bigger than my head, but the melodious high voice of a great soprano!
I felt my pulse hammering in my throat. The air in the room grew thick, smelling of lust and female pheromones. I looked at Vixxa, then back at my mother, who was watching me with a strange, permissive intensity.
“Is she ... is she really just a computer?” I managed to ask, my voice cracking.
“Her mind is, with a robot skeleton, but rest is a real live woman. Her desire is hard-coded, and her body is yours,” Mom replied, her voice dropping an octave. “She doesn’t have a choice but to love every single thing you do. Now, stop staring and let me see how she handles you.” Even more shocking was Mom’s order, “Hurry up, strip and fuck her.”
I didn’t need to be told twice. I dropped my clothes and lunged forward, my hands finding the swell of those massive breasts, feeling the weight of them displace against my palms. The cyborg let out a sharp, needy moan, her back arching as she pulled me closer. She wasn’t just a fucktoy; she was a biological paradox, three stages of womanhood fused into a supremely hot sexborg.
“Oh God,” Vixxa gasped, her legs wrapping around my waist with a strength that felt almost crushing. “Please, Zander ... I can feel the hunger in your skin. Give it to me.”
The raw, unfiltered need in her expression was intoxicating. I could feel the heat radiating off her, a simulated fever that matched the desperation clawing at my own gut. As I pushed her back onto the velvet cushions, her wide, innocent eyes remained locked on mine, while her body demanded a level of intensity that might have broken a human girl. I reached down, discovering the wet, welcoming heat of her, a contrast to the youthful softness of her face.
Mom didn’t move from the doorway. She just watched, her breathing shallow, as I surrendered to the erotic madness.
Vixxa was a glitch in evolution, a Frankenstein’s monster of desire crafted by some depraved genius who decided what a “perfect girlfriend” was. And her morals? Pure filth! The “scientist” hadn’t just replaced her brain with a computer; he’d programmed her with an insatiable, digital hunger. She wasn’t just consenting; she was craving the friction, her silicon mind looping in a permanent state of arousal. I could feel it in the way she shuddered, her synthetic heat radiating against my skin, her internal processors humming a low, vibrating frequency that rattled my very bones.
“Look at her, Zander,” Mom whispered, her voice sounding distant, almost hypnotic. “See how she takes you? She was designed for this. Every inch of her was made for your pleasure.”
Suddenly, the cyborg let out a jagged, guttural cry, her head tossing back as I slid my hand down to the same time she had welcomed me. She was a paradox of anatomy. Her vagina was tight as a high school virgins, but as my fingers wandered further, I found the loose, welcoming depth of her anus. Her excellent asshole was designed with the relaxed, seasoned capacity of a mature prostitute. It was a dizzying contrast, a collision of youth and experience that made my head spin.
“I want more,” Vixxa gasped, her voice a breathy, desperate melody. She grabbed my shoulders, her nails digging in. “Zander, please ... my body is screaming for you. Fill me. Use every part of me.”
I didn’t wait. I buried my face in her gigantic jugs, the scent of perfume and musky female sweat filling my lungs. She arched her back, her legs locking around my waist with a strength that felt predatory.
“Is the ‘Adaptive Pleasure’ chip working, Mother?” I yelled out, breathless, as I drove into her.
“It’s working perfectly,” Mom replied, her voice trembling. I could see her leaning against the wall, her own hand drifting toward her thigh. “The way she molds to you ... it’s exquisite. Don’t stop, Zander. Don’t you dare stop.”
The cyborg’s eyes rolled back, her face a mask of pure, simulated ecstasy. She began to moan, a raw, unfiltered sound that filled the room, her body shaking with the force of a thousand programmed orgasms. She was a machine, a toy, a miracle of bio-engineering, but as she clung to me, her wide-eyed innocence contrasting with the graphic, heavy lust of her body, she felt more real than anything I had ever known.
Suddenly, the room felt too small. Vixxa wasn’t just a gift; she was a passport. Over the next few months, we didn’t just stay in that bedroom. We took the “Adaptive Pleasure” chip on a tour of the world. From the neon-drenched alleys of Tokyo to the salt-sprayed cliffs of Santorini, I pushed her to the absolute limit of her hardware. I learned exactly how she worked, how her silicon mind could be overclocked into a state of permanent, shivering need.
In the back of a humming mag-lev train in France, I spent hours buried in the mountainous warmth of her chest, climaxing across those heavy, vein-streaked mounds, the synthetic skin absorbing my heat. In the shadow of the Parthenon, I’d force her to her knees, the contrast of her cherubic face and her ravenous, wet mouth creating a friction that nearly broke me. And when the world felt too quiet, I’d drive into the deep, seasoned warmth of her anus or the tight, pulsing urgency of her vagina, feeling the internal processors hum against my skin as she begged for more.
“You’re shaking, Zander,” Vixxa whispered, her voice a sultry vibration against my neck as we lounged in a private villa in Amalfi. She was draped across the silk sheets, her colossal breasts spilling over her ribs, her eyes wide and blinking with that deceptive purity. “Your heart is racing. Are you still trying to figure out where the machine ends and the woman begins?”
I gripped her hip, feeling the lithe, athletic muscle beneath the surface. “It doesn’t matter,” I grunted. “As long as you keep screwing me.”
Suddenly, the door clicked open. My mother stepped in, wearing a sheer wrap that left nothing to the imagination. She hadn’t stayed behind in the bedroom all those months ago; she had become a silent partner in this experiment, her own desires awakening as she watched Vixxa mold herself to my every whim. She often masturbated watching us.
I dove back into Vixxa, my movements frantic, while my mother’s hands wandered over the cyborg’s mountainous breasts, her own breath hitching in a joyous way that sounded almost like a sob.
After breakfast, Mom told my semi-alive lover and I; “I’m going out of town on business, and I’ll be back in three days. Vixxa, do not allow my son to leave the house, watch videos, play games, or contact anybody. Order grocery delivery if you run out of something, but stay home. As the most important instruction while I’m gone, and a special challenge, you will make my son ejaculate as many times as possible until I return. Use any means necessary, if it doesn’t injure one of you or damage the house.”
I smiled so intensely my cheeks hurt.
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