Content Warning: This tale has elements of consenual non-consent and forced anal-sex, though there is consent woven into the story throughout.
The boxes finally arrived. I had ordered my new robot intimacy assistant weeks ago and had been impatient ever since. I’d opted for the latest model, fully programmable with male and female modules: expensive, sure, but cheaper than buying one of each sex.
I opened the boxes and carefully took out the thankfully few constituent parts. Essentially the main sections to be put together were the head, torso with arms, pelvis, and legs. Beneath the latex exterior the device had small balloon pockets which filled with air to give the sensation and appearance of muscles. Synthetic silicone breasts could be easily attached.
Through the use of various motors the machine possessed impressive pelvic control, able to gyrate and thrust through a wide range of angles and distances.
When fully assembled, the whole thing would stand upright on legs, and, although it was not capable of real movement, there was enough motor control to remain stable even during heavy usage sessions.
The arms and hands too possessed only perfunctory dexterity. Not enough finesse to caress sensually, but sufficient to move and hold the user in position during play.
The head was capable of various facial expressions, had eyes that blinked and a latex mouth hole with suction function. An internal speaker inside allowed the machine to play sounds and phrases.
But the real magic was the pelvic section. It had removable pubic hair (cheaply attached with velcro) and a realistic anal opening with a hydraulic sphincter that reacted to touch. The female module slotted in to provide a life-like vagina with integrated lubricating fluid reservoir while the male module had a realistic erecting penis which could be programmed to adopt all manner of lengths and girths. The shaft was also self lubricating, a nice touch. The member was fairly flexible; the robot had a small camera on the pelvis to allow it to aim for the user’s designated orifice. The scrotum contained a 250ml reservoir; provided in the package was a starter pot of methylcellulose which could be mixed with water to fill the machine to simulate 50 ejaculations.
I assembled it carefully, each part clicking reassuringly into place, the joints held in place by magnets. Finally I connected the power cable to charge it up for first use and installed the app on my phone.
I had opted to use the male pelvic module for the first trial run. The app presented sliders to adjust the penis size. I watched, impressed, as I touched the screen and the erection swelled from the size of a finger right up to the size of a cucumber. Ridiculously large. I swiped the screen and the penis shrank back to a much more reasonable size.
Curious to explore the range of sensations that the machine promised, I opted for anal penetration as the trial run.
I positioned myself bending over the dining table with the machine behind me. I tapped the sequence start button and watched the screen with a cheeky grin. It was a thrill to watch the pelvis-eye view. The tip of the penis twisted and turned as it lined up with my arsehole. The motors whirred, my backside began to fill the screen as the pelvis pushed slowly towards me.
The robot arms moved and the hands gently held my hips.
The first contact was sensational. The warm tip vibrated slightly causing me to involuntarily clench. I continued staring transfixed at the screen, almost embarrassed to be watching my own anal muscle relax and open, then the machine pushed and the auto-lubed penis disappeared smoothly into my arse.
Once inside I set it to tender thrusting and settled myself, appreciating the gentle sodomy it gave me.
After a few minutes I fiddled with the app again. I found and activated the pulsation setting.
The feedback was less instantaneous than when I first started the system but the sensation it delivered was worth the wait. I felt cyclic ripples travel the length of the shaft buried inside me; truly amazing and something no human penis could achieve. The internal massage sent shivers of erotic delight through me. This in itself justified the price tag.
I explored the menus a little more and set a 10 minute sex session timer with auto ejaculation (default volume).
Still lying across the table, I felt one of the robot’s arms release its grip on my hip. The actuators hummed quietly and the arm came to settle between my shoulder blades, gently pinning me against the table.
I surrendered myself to the machine as the pelvic motors worked tirelessly in me.
I tapped the screen again to speed up the thrusting. Nothing happened immediately and the screen appeared to be momentarily frozen. This was slightly frustrating but soon the system woke up and obeyed my command, bringing me to a new level of pleasure.
I was by now used to the probe’s size and wanted to be stretched slightly more so I used the slider to increase the girth a little. Again the system took a short while to respond and I waited, actually appreciating the tease.
Presently the actuators whirred into action and then the swelling began, slowly at first. I shuffled my feet slightly further apart and let out a satisfied moan, amazed at what the machine was able to do to me. I felt its increased length too, each thrust entering me slightly deeper than the last.
However, the swelling didn’t stop where I expected it to and I felt my sphincter begin to stretch wider than ever before. I started to panic a little as it pushed the boundary between pleasure and pain.
The robotic hips retracted till the android cock was almost fully out, just the inflated tip holding my sphincter wide open, then paused for a split second before it plunged back in. I stared in helpless fascination as the screen continued to display the video feed from behind me; my hole was alternately stretched white then red raw as the shaft slid mercilessly back inside.
Each cycle seemed to drive deeper than the last.
I had a growing sense of concern for my poor arsehole but I was pinned, unable to shake the machine off me.
Alarmed, I jabbed at the interface desperate for it to stop, but it was now totally unresponsive. Only the floating video screen remained, seemingly mocking my predicament.
I groped frantically behind me hoping to push the machine off or to feel for an emergency stop button but to no avail; the machine was too strong to allow me to twist far enough.
The whirring noise rose higher, grinding away behind me. The machine clanked and screeched. Soon I smelt a metallic tang, as if a circuit had overloaded but still the robot beat away, relentless.
I began to panic, sweat dropped from my forehead and neck. I gripped the table edges to brace myself for each impact, my knuckles white.
As the intensity increased, I considered calling the safe word to stop the machine. Every time I felt I was at my limit I hesitated, deciding to continue the experience just a little longer.
The automaton’s dick continued to self lubricate, sliding in and out of my arsehole which felt like it was going to snap at any moment.
As it pounded deeper and deeper, I felt as if my insides were being rearranged. I would never have chosen this size or level of intensity myself but the obscene sensation was becoming disturbingly compelling.
I wriggled against the table, adjusting my hips a fraction to savour this brutal sensation, surprised that I was now exploring just how far I could take it.
Finally the 10 minute session reached its mechanical climax. The thrusting escalated; the machine alerted me to its imminent ejaculation before pushing into me and pausing; the swollen dildo pulsed realistically, squirting its spunk into my rectum. As the warmth pooled inside me, I breathed a sigh of relief and waited, expecting the machine to either withdraw or deflate to its default size. However, the silence was short-lived. The servo mechanism whirred back into life, the hips pulled the cock out, almost clearing me completely but then slamming painfully back into me, once again pumping out another measure of synthetic cum.
With growing horror I recalled how I’d gleefully filled the reservoir to the maximum capacity. Now I dreaded the imminent reality of being filled with 50 cyborg loads.