The best thing that you could compare a xenomorph to would be some kind of parasitic wasp with the only thing that the creature missed for being a direct counterpart would be that a xenomorph doesn’t sting you. The creatures were thin and efficient, with thin arms and legs and a slightly meatier torso, a set of sharp teeth that could seemingly bite through flesh like a knife through paper and a fast running speed that meant it could catch up and kill prey easily. They also had several behavioural similarities such as extreme aggression to anything that wasn’t them which would often lead to one taking on a pack of aggressors and winning to the fact that the creatures were entirely subservient to a massive queen entity that pushed out eggs almost twenty-four seven and produced what would make up the final part of the similarities: the breeding process.
Xenomorphs are an all-female species and as such can only breed parasitically in a process known as “inter-oesophagus incubation” Which starts right at the egg stage with a creature known as a facehugger, something you could only describe as a combination of a spider and a nightmare. The facehugger holds a fertilised egg no larger than a human’s inside of it and when the face hugger finds a suitable host to will latch onto the host and deploys the egg directly into the oesophagus which then attaches to one of the walls of the oesophagus. Over the course of several hours, the egg will grow rapidly due to the combination of heat and enzymes leading to pain, difficulty breathing, bleeding of the oesophagus wall and even death in a host.
When the egg has finished its incubation the infant xenomorph, known as a chestburster, moves down into the lungs where it will promptly gnaw through the flesh above and burst out of the chest in a process known as “Parasitic birthing.” After that, it will mature into a xenomorph and serve the queen by bringing it food, more hosts for facehuggers and even a couple of mates so it can keep the production of eggs at a steady level. This is an issue for you as it was your job to cultivate and produce xenomorphs for future experiments but you weren’t allowed any human hosts since it would kill them and neither were you allowed any corpses side the conditions were not right for birthing.
That is how operation heartbeat started, the name being due to the fact that as soon as a xenomorph foetus enters the body its heart starts beating as to signal to the rest of the cells to begin growth. For this idea, you needed to have access to one mature xenomorph with a high enough estrogen and progesterone to carry the egg, one actual egg which should not be fertilised and the best gene-editing equipment in the business. The xenomorph and the gene-editing equipment name first and the egg was coming the day after so you had plenty of time to play around with the xenomorphs biology, with you being able to wrangle the alien and sedate it before putting it into the gene modification chamber.
With the chamber and a high powered computer, you could see microscopic parts of the aliens cellular and genetic makeup but you were also able to modify the body and make genetic transfers that would help mould the creature into what you want it to be. The first thing you did was modify the “protowomb” that laid in the creatures nethers to be able to take and produce xenomorph eggs instead of producing facehugger eggs turning it into a human womb in the process. Next was linking it to the chest if the creature, creating a large slit between the breasts of the beast in order to allow the critter safe passage out without hurting the xenomorph. Finally, you made some behaviour modification to the creature, making it so that the creature would react to you positivity like it was a member of its own species instead of as an enemy.
With that the genetic spieling was complete, with you overseeing the process for several hours before the modification was done, the sound of the machine stopping as the sedatives began to wear off. With that you walked into the xenomorphs chamber where you then deactivated the machine remotely, watching as smoke came out the cracks between the door as the machine proper before the door flies open, a shadow falling through the smoke and onto the ground. You watched as the creature crawled out of the smoke, giving you a good look at this body, your eyes first being attracted to it’d head, the bulbous shape shining off in the light due to the black chitin shell, it’s mount drooling with sticky spit as it’s long, thin tail lashed against the ground.
The creature soon got onto its hind legs, stumbling slightly as it showed off its new chest to you, with you releasing that the split in the chest made the tits slightly larger. As for the hole in the chest, it appeared to be slightly larger than you were expecting, going from just below the neck to about 10 or so centimetres above the lower stomach, the hole seemed to be made out of soft skin tissues and muscular fibres. However, the one thing that you didn’t expect to see was that the hole went straight through into the creature's torso which meant that you could see her beating heart which looked a lot like a human's only with a few more valves coming out of it and being a dark green instead of a dark red.
She quickly crawled up to you, the woman growling and chittering to herself as she scanned your body, her hands scampering and pressing against each other before she managed to sit down on the ground, seeming calm around you. You looked up at her and smiled as you called in for a piece of tech yet unnamed, it’s official code name being EJM-Mod-XX121. The mechanism was patented and made by Dr Ezekiel James who worked at the London medical research institute, the Apparatus being named after him. The Ezekial James mechanism was built to help with high-risk heart surgeries for things like tumours or clotting issues and was equipped with blood-thinning agents, electronic resuscitating pads and cameras for internal viewing when a patient cannot risk a full opening.
The EJM-Mod-XX121 was the same in many ways, with the defibrillators being replaced with a pair of arms that could stretch and close the wound depending on how you operated the mechanism with the entire metal being replaced so the acid blood didn’t go through it in case of error. An assistant moved to the room and dropped it behind you, still bearing a couple of cuts from when you had to wrangle her, the large metal contraption being like a metal vest, the creature curiously looking at it as you picked it up and moved behind her. The Xenomorph quickly turned around to face you, with you having to push her back which made her produce a slight growl as you lifted the mechanism onto her body.
The mechanism went on very simply, clicking around the shoulders and her spine, making it stable as she clicked, clutching and knowing at the metal as she got used to it, the metal prongs hanging away from the hole in her chest. You went over to where she was facing, moving her head up from the bar she was chewing, the creature clicking on your hand as you began to move the metal prongs into the hole, the first one pressing against her skin and pulling back on the edge of the hole slightly. She made a surprising sound as you stretched the hole slightly, the woman moaning out quite loudly as the second prong was placed onto the hole.
After about a couple of minutes of pushing the prongs into the hole, you eventually got it so that the hole was gaping outwards a bit more, allowing you to see more of her heart. It was a weirdly beautiful thing, the ticker beating at a slightly more accelerated rate than the average humans, the green blood glowing slightly as it flowed through, the creature drooling before she suddenly moved closer to you. She seemingly straddled you, her feet either side of your legs as her waist landed right upon your hips, her pussy starting to get wetter and wetter, her hand scratching against the wall, a small light coming on in the harness due to her leaning over and blocking the roof lights.
It was very obvious that she wanted two things from you now that you had turned her on: More stimulation of the heart and chest hole and to be bred, to have a baby pumped inside of her womb and feel how pregnancy felt like and who were you to deny her that? You moved your hands down away from the hole and down onto your underwear, slowly unbuckling your trousers and slowly pulling them down, her pussy fluids dripping into the thin fabric of your underwear which made your bulge more pronounced. You then manage to slip your underwear down next, feeling your hard cock fly through the air and hit her in the waist, the woman moaning out as drool falls down her mouth and onto your chest.
The woman moved her legs further back from you, meaning that her pussy was right above your cock and letting it drip onto it, lubing up your cock as she chattered and ground her teeth together. You moved your hands away from your sides and onto her hips and then down onto her ass which wasn’t the largest in the world but it certainly thick enough to get a good handful of xenomorph flesh, the woman’s tail lashing against the ground before she calmed herself down before you slammed her onto your cock. You felt her hands wrap around your back, her fingers being sharp enough that they pushed onto your skin slightly, you felt her grunt and moan loudly, her tail wrapping around one of your thighs as she slammed into your hips several times with a bunch of half-thrusts.
You could see into the hole in her chest to see that her heart was beating at an insane pace, the heart slowing down as she got over the shock of being on your cock, the woman straightening her back as she looked over at you. You moved your hands away from her ass, moving one of your hands up to her thigh and the other one of your hands trailing up her back and onto her stomach before moving into the chest hole. At that moment the woman began moving her hips of her own volition, slowly moving up your cock before moving down it again, her pussy lips clenching up against your cock and making sure that you couldn’t escape her pussy fully.
You let her because on your cock for a couple of monitors before you got more curious about the hole that was attached to her chest, moving a single finger inside and rubbing against the sides of her hole, causing her to moan in the process. Drool was dripping down her chin as her hips began to move faster against your hips, slamming down into them whilst her fingers twitched on your back, with you gritting your teeth and moaning as she thrusted. You began to push more and more of your hand inside of her, being careful to not make her go too fast before getting the entire hand in, blocking the light that was pointed at her heart somewhat.
You could feel the heat pushing off her heart and onto your hand, the woman’s bouncing on your cock getting faster and faster the closer you got to her heart. You Extended one of your fingers further inside of her chest hole which was getting closer and closer to the organ, eventually touching it and brushing it, causing the woman’s pussy to clamp down on your cock hard and a loud moan to echo out of her mouth, her second mouth briefly extending out of her mouth before going back inside. This is when you realised that it wasn’t only the chest hole that was an erogenous zone but her heart was one as well.
With that you pushed a few more of your fingers onto her heart, stroking her heart and making her moan and squirm on your cock, the woman getting faster with each finger being introduced to her organ. From there you decided to go for a little more adventurous gesture, slowly moving your hand deeper inside of your chest, with you feeling the rhythmic beating of the organ against the air. You then moved very slowly towards the heart, letting your palm press against it for a couple of seconds before wrapping the rest of your fingers around it, feeling the heartbeat rapidly in your hand as the woman let out the loudest moan you had ever heard.
Her hips suddenly went at such a rapid rate you thought that they would be bruised in the morning, the woman’s pussy twitching and pressing against your cock whilst her drooling mouths moaned with pleasure. Her tail was constructing against your thigh as you began to massage at her heart, pressing your fingers gently into one side whilst the palm rubbed against the other side of it, causing her to moan even more. At this point, both of you were bathing in each other’s pleasure, with you feeling as beads of sweat dripping down your body and either into the floor or soaking into your shirt which only made you even warmer.
You then felt as your cock began to throb inside of your alien lover's vagina, getting closer and closer to cumming inside her and giving her a facehugger by the second and judging by the fact that she was constantly moaning and clenching against your cock, she was getting quite close as well. You could feel as the pressure at the end of your cock got harder and harder to keep inside, with you not wanting to cum due to how much pleasure you were giving her, your other hand moving down from her thighs and down onto your ass, groping at her assflesh for a couple of moments, the woman’s heart going faster and faster in the process.
Eventually, the pressure at the tip of your cock got too much for you, with you moaning out loudly as a massive first shot of cum pushed out of your cock and deep into her pussy. She moaned out loudly, with you feeling as her heart beat against your hand as she clamped her pussy down on you whilst her hands grasped your back, bucking her hips with each shot of cum that you pushed inside of her thin body. After God knows how long you finished orgasming inside of her, her pussy slowly being filled to the brim with cum before you pulled out, the last couple of shots splattering all over her stomach as her heartbeat calmed down.
You pulled out of the hole in her chest and placed both of your hands onto the ground, panting as the chest rested in your body, with you feeling as her heartbeat inside of her chest. She eventually pulled off and went back to walking around her room, seemingly not minding the harness that was attached to her, clicking and growling to herself before stabbing at the DNA machine a couple of times, not doing much damage to it as you got up off the ground. You slowly moved your underwear and trousers back on before leaving the room and going back to your office, sitting back at your desk and starting up an email, saying that the experiment appeared to be a great success with the hole having no medical effect on the xenomorph although you did request to have more... personal time with the xenomorph.
After all, how could you be sure that she’d get pregnant in the first try?
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