Author's Notes: This story is inspired by the long-gone Literotica story "Aliens Use Sex to Invade". It is primarily Science Fiction and Fantasy but has elements of Gay Male, Group Sex, Lesbian, voyeurism, and Incest/Taboo. All Characters are over 18 years old and are not intended to be based on real individuals.
Additional note: This particular chapter includes elements of Non-consent. Read at your judgment.
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Doctor Jorden Gray, Age 45, Biologist, Science Division.
Sarah and Doctor Gray spent the next few hours discussing the odd behavior among the colony's inhabitants, and it was revealed that Dr. Gray made a career of being an anti-social person, choosing to focus on his work than have relationships. Yes, he lost his virginity at the age of twenty, but aside from that, he's had little dating experience. It was one of the reasons why he had a double major in neuro and microbiology. Sarah became envious of the older man's skills and knowledge.
After calling her father and adding his comlink to the discussion, the three of them had a game plan in place. When Dr. Gray came to Mars in the first Colonial ship, he brought along non-organic surgical units, robots that could perform a multitude of complex tasks and could easily be programmed to serve functions. They were invented by a member of Gray's family, and Gray was among the very few rich enough to own several of these machines.
The plan was simple, yet challenging. The robots would enter the bio lab where the specimens from the shipwreck were kept, namely the black goo and the corpses, and perform complex experiments to determine if there was any connection between the ship and the behavior of the colony. Sarah's engineering background gave her the means to program a code inside of the machines so that they could look for anything related to what she'd seen among the colony's people: Increased libido, larger cocks, bigger breasts, and possibly anything inside the body.
Dr. Gray gave her access to three of the robots, whom he'd nicknamed "Huey", "Dewey", and "Louie". When she was done a few hours later, they activated and went to work immediately. The robots had anti-gravity units, allowing them to float, as well as surgical tools embedded in their chassis. Essentially, the machines looked like the round interrogation droids from the original Star Wars movie, only they didn't beep or trill and they were chrome colored instead of black.
Gray, meanwhile, grabbed a remote access module and the two of them left the medical facility, surprisingly with few people asking why Gray was leaving early. It was like no one cared that they were around at all.
By the time the two of them were out and long gone, the entire wing of the hospital erupted into chaos, everyone ripped off their clothes and burst into a sexual frenzy. Men sporting footlong erections dove into any hole available, asses, pussies, mouths, even outstretched hands. Women with double D-cup breasts started mauling each other's tits and pussies, some entering a 69 position, others forming head-to-toe daisy chains.
A few groups joined forces and were double penetrating or triple penetration, and a few were doing the Amazon sex position, having the women being the ones thrusting in and out while the man's legs were in the air. No one cared which position they were in, as long as the ultimate goal was sexual gratification.
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Peter Jefferson, Age 23, Archeology, Research Division.
Peter was in the middle of a bisexual threesome, getting fucked in the ass while a pussy was on his dick. The guy fucking him was Jefferson Boyle, who sported a monster of a BBC. The one he was fucking was Emily Ford, the woman who refused his advances way back when. Now, however, she was getting off on his cock and moaning wildly. They were in the barracks, and dead center in yet another orgy, which never seemed to end after that fateful evening. All around them were warm bodies, naked and orgasmically charged.
Absolutely no one in Peter's little group cared if they came in each other's holes, as they'd already cum a dozen times over, and were still hard after three hours of non-stop fucking. This was just the latest position. Peter was amazed that he'd been able to stay hard for three hours, but he'd long since accepted that whatever infected him on the wreck was doing its absolute hardest to make sure he never went soft again! It was likely also what had given him his new body, looking super sexy with bigger muscles, a bigger cock, and a tighter ass.
Peter was the first to be infected by the alien parasite, as well as the first to actually do something with his cock. He fucked John Ford's ass that first night, encouraged Jack to be more outgoing in their efforts to turn Aldrin One into an orgy colony, and even now, as he was having the ultimate sex marathon in Martian history (Literally, since the colony was only a few years old), he couldn't help but praise himself for simply being a nymphomaniac.
Jefferson Boyle's cock pistoned in and out of his ass, and within moments of the thought entering his mind of how explosive and powerful it would be to cum inside him for what seemed like the hundredth time, and still felt like the first time, Peter was met with an eruption of sperm passing his sphincter muscles and entering his hole, flooding his insides with a healthy dose of cum.
He let out a breath as he, too, erupted inside of Emily, who in turn, had her own squirting orgasm. No matter how many times they had sex today, they all had orgasms like they were freshly fucked virgins.
After a long pause after their latest ejaculation, the three of them disengaged from each other. Jefferson pulled out, followed by Peter. The two men then offered their dripping cocks to Emily, who gladly cleaned them up, not flinching from the fact that Jefferson's cock was in Peter's ass. As soon as she cleaned up the cum, she sat back and sighed heavily, massaging her firm breasts.
Emily was pregnant, having taken her brother's sperm a month and a half ago, and was now feeling the signs of the first trimester. Strangely enough, her pregnancy, along with Laura's, seemed to be accelerating. It was usually around three months that the baby bump would show, but their pregnancies revealed themselves within the first month.
Somehow, the babies were growing faster than normal, almost as if an outside force was giving them a fast track. At no point during the first two or three weeks did Emily feel any morning sickness, except for the first two days she discovered she was pregnant, after that, all the classic cases of the first trimester seemed to vanish: She was slightly fatigued after sex the first week, but then her libido kicked in and she became horny to the point of needing two or three cocks inside her at all hours, and her food cravings became bizarre.
She was desiring more protein in her diet, and her normal preferences seemed to take a backseat to the strange combinations of foods, notably pickles and blue cheese on rye, smothered in cum. That last part was easy, since she had a ready supply from John and a few of the other marines in the barracks, near her apartment.
Laura's mood swings were also going haywire, going through every emotion within moments of each other, before honing in on horniness, constant horniness. She had demanded a mouth, hand, or cock on every part of her body. It was no longer surprising to see her in the middle of a gangbang with three cocks inside her, and four or eight hands roaming her body, namely two hands on her hips, two hands on her breasts, and two on her ass, and two roaming her pussy in addition to someone fucking her. She wanted to be fingered and fucked at the same time.
Ava Sharp was experiencing similar cravings for sex, but she wasn't pregnant...yet. She was trying, however, having had her birth control implant removed and was now detoxing on the effects. In the late 21st century, scientists developed a means to regulate pregnancy by introducing a sterility implant, which neutralized all fertility of sperm whenever it entered the womb. It became the ultimate birth control pill and was soon commercialized and promoted by all parties who had previously had a hissy fit over the use of contraceptives.
Now, however, Ava no longer desired to have sterile cum entering her womb and wanted a baby, so she had hers removed and was now suffering from the aftereffects. Among the after-effects of the implant's removal was residual sterilization of the cum for about two weeks before she could get pregnant. Since everyone was horny to the point of having a perpetual orgasm, she wasn't thrilled about neutralizing everyone's cum when she had a creampie. But, she made up for it: She offered her leaking pussies to anyone who wanted to munch on it.
And the Anders kids definitely wanted to munch on her pussy, along with everyone else's. All four 19-year-old recruits, fresh off the boat, were eager pussy pleasers. Bart and Brad, along with Betty and Bethany, all seemed to drop to their knees and eagerly munch on any waiting pussy that crossed their paths, lapping up as much cum as humanly possible.
The Anders Kids had done a complete 180 after the Barrack's orgy. Before they watched and then joined in, none of them would have ever considered committing incest or infidelity. Now, when they weren't engaged in an incestuous foursome, the four siblings were eating pussy, sucking cock, and taking any cock inside them at the drop of a hat.
Betty and Bethany were virgins and had taken oaths of chastity, while Brad and Bart had almost zero chance of attracting partners due to their introverted nature. Sure, they were handsome but had almost no social skills. Now, however, their minds were a haze of desire, for each other, as well as pleasing others, and they seemed to exude some kind of openness to engage in sex, making them ideal candidates for men and women alike. Every chance one of them got, the other three soon followed and eventually all four of them were well-fucked and eager to please.
Jefferson's cock was ever hard, all fourteen inches, and he was eager to join someone in yet another round. As he walked away, looking for an ass or pussy to plunge into, Peter's comlink activated. He checked the caller. It was Jack.
"Hey, Jackie," said Peter, activating the comlink, "You wanna join the latest Marine fuckfest?"
"Can't! We've got trouble!" Said Jack, "I need you to do something!"
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Hewie, Dewey, and Louie entered the bio lab at 0200 hours, scanned the corpses of the alien crew, and scoured through the autopsy reports conducted when the two bodies were originally brought in. According to Gray, the corpses died on impact of the ship landing on Mars, but before their deaths and charring, the two aliens, along with their entire ship's bridge crew, were engaged in some kind of orgasmic overload.
