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.
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Doctor Julienne Gray, Age 40, Genetics Researcher, CDC.
'Three weeks and already all of Atlanta was infected with a parasitic virus.' Thought Julienne, as she lamented over her thousandth failed experiment. It was the third week straight that she failed to find a cure for the parasites that were invading the populous through the various sexual activities that originated with the Anders marines who followed Peter Jefferson from the Mars Colony.
By the time Julienne and the CDC got the necessary funding to quarantine the city, half a dozen people who had been infected had skipped town. Julienne heard from the authority of the local government that the daughter of a prominent political donor had recently been seen hanging out with someone who was later confirmed to be Bartholomew Anders, one of the infected marines from Aldrin One. Later, when the quarantines hit, Julienne learned that she and several of her friends had taken a vacation to Jamaica and were last seen in the Hedonism Sex Resort.
Suffice it to say, they were long past containing the epidemic since there was no telling how many people Diane Rutherford and her friends had infected while vacationing in Jamaica, and almost no way of learning the destinations of the other attendees of the resort since the resort's staff refused to share any information regarding their members' private identities and contact info. Not even the Government of Jamaica would budge on the topic.
In the end, Julienne's final resort was to perform invasive experiments on Peter himself, as he was the only one whom she knew could provide any useful information at all. She started with blood tests, semen samples, and every other fluid that he could provide. She quickly learned that the parasites did indeed travel through the mouth or penis, at least for men, when seeking a new host. She also learned that Peter's sperm count was exponentially high in comparison to most males of his gender and level of athleticism.
After another week of tests, she finally hit a breakthrough when she found a small enzyme in his semen and discovered one of the parasites that inhabited his body. She carefully extracted it and studied its composition. After a few hours, she finally had a specimen in which to compare to other victims.
The next morning, she took sperm samples from a dozen other men who'd been confirmed to have been infected. These men included three construction workers, an office employee, and eight boys in their late teens. Each man had sperm samples of equal levels to Peter, those theirs were diminished, which she speculated was due to Peter being infected long before they were.
She did, however, discover that each sample provided how she could identify the parasites themselves. Her next experiment could have easily cost her career and possibly her doctorate. She told Carol to go into Peter's cell and get infected.
Carol protested but eventually conceded because she'd eventually be cured. She had the utmost faith in Julienne and went into Peter's cell, equipped with a piece of equipment to monitor her vitals.
Peter, for his part, was eager to fuck a woman. He'd gone without sex for three weeks and it was taking a toll on him. The moment Carol started taking off her clothes, he pounced on her, grabbed her breasts and started mauling them, taking her nipples between his lips and sucking hard. She let out a low moan as his left hand made its way to her pussy and he started fingering her violently.
Within a few minutes, their clothes were ripped apart and Peter had Carol on all fours, fucking her furiously. She let out a scream of pain as he ravaged her pussy without mercy or care that he was causing her pain. He was tired of waiting for sex and wanted it more than ever. He didn't care that he was acting rough, all he cared about was cumming inside her.
He lasted less than five minutes and came deep into her womb, flooding her insides with his cum. Julienne monitored their progress and her probes, which were embedded within Carol's pussy, beeped when they detected the presence of the parasites. She watched as the parasites travelled into her limbic system and told Carol to try and get away from Peter, to get as far away from him within his cell as possible.
Carol heard the order, turned on her side, and kicked Peter off her before she hurried away. Peter, for his part, was too satisfied to react and simply started humming in post-coital bliss, reeling from the momentary rush of endorphins.
Julienne then watched as the other detection software within the probes identified the chemical composition of the parasites as they altered Carol's body, increasing her breast size and widening her hips and vaginal walls to accept a larger cock.
Within moments, Carol was heaving a sigh of relief as her mind accommodated the new emotions and thoughts, the drive for sex, as she turned toward Peter and practically tackled him, gripping his cock in her hand and pumping wildly. Peter, now fully aware of the naked woman trying to get him hard again, turned and kissed her full on the mouth, which she immediately reacted to by kissing him back.
Their hands went to all corners of each other's bodies and soon the two of them were humping against the walls of the cell, Peter fucking into Carol as she wrapped her legs around the small of his back, her heels hanging inches above his ass. The last thing Julienne heard before she cut the audio was Carol's cries of ecstasy and yearning for more cum.
She sighed as she covered her face in her hands. Her best friend was now a slave to the parasites and they were going to fuck for the next five hours or more, and it was all her fault. Julienne then redoubled her efforts to find a cure.
Over the next five days, she worked day in and day out, compiling information on the parasites, trying to find secrets within the genetic code, and looking at anything that could affect the human body that would also affect the parasites, but nothing worked. Whatever her research pointed to as being an effective tool against a normal person, had almost no effect on the parasite. As it turned out, Peter was right about his allergies being cured. The first thing Julienne tried was to expose his lungs to pollinated grass and ragweed, and he didn't even flinch or cough.
Of the other individuals she experimented on, their results were essentially the same. One of the young adults, Steven, had a food allergy and he'd seemingly overcome it almost immediately after spending an hour masturbating and eating his deposited cum. Greg, the foreman of a construction site, had absolutely no effect on increased heat or cold.
Nothing seemed to work at all. The only thing that managed to get any effect was exposing a single parasite to salt water, where it shrivelled into nothing. That gave her the idea to expose a person to salt water, and she gave Steven a glass of salty water. Once he drank it, however, he convulsed and collapsed, his penis shrunk to the size of a hot dog and his body deflated into a lanky mass. Saltwater was indeed a cure, but it made her pause at the implications of providing that cure to everyone involved.
Yes, the parasites would die, but she saw Steven's reaction when he awoke after drinking the salt water. He was devastated to the point of begging to be let into Peter's cell, to have the parasites back in his body once again. He was moved to tears when he was told that the salt water would be in his system for a while, meaning if he attempted to get infected again, it may be a useless endeavour, even if Julienne would even allow him that.
Thus, she was faced with a moral quandary. If she told people about the cure, they'd surely implement it without question, but the people who were infected claimed to be better for it, having gained knowledge of alien races far more advanced than humanity, and having a more desirable bodies, bigger cocks, breasts, and more prominent muscles. They loved the power the parasites gave them and the ones she spoke with made every effort to convince her of letting a parasite infect her too.
They claimed that the parasites liberated their minds and bodies and that they were superior to everyone else. If Julienne made them take the cure, she'd be responsible for thousands of people with PTSD and possibly depression. She wasn't about to turn humanity into a sorry excuse for a species just because some of them were infected with a parasitic organism. For all she knew, she had no right to quash a species' right to exist. So, she did the only thing she knew how to do. She destroyed her research that led to the discovery and worked on something else.
Over the next several months, she worked tirelessly to devise a means to remove the parasites safely without diminishing the gifts they provided. She worked tirelessly day and night to ensure her work would never be abused. It was mid-July by the time she tried her next experiment, this time on Carol.
She isolated the enzyme used in the metamorphosis process and tried to combine it with a saltwater droplet. She gave both to Carol and waited for the results.
The results were immediate. Carol's body shook but her breasts stayed large and her vagina glistened. When Julienne asked how she was, Carol refused to speak for a long time. Later, after a twelve-hour observation, Carol finally told Julienne that she felt no different than when she was infected, but now had the clarity of mind to realize everything she and Peter did in that cell and had many regrets.
Carol, being a lesbian herself, was moved to tears by the horrible acts of having a penis inside her and semen. She'd never liked cum and never wanted kids, but when she was infected by Peter's seed, started begging to be impregnated by him and wanted to have as many of the young man's kids as she could. It was astonishing that she never got pregnant at all during their isolation, but now she was repulsed by her o twisted desires.
Julienne knew her friend was not well, and also knew that her experiments were a failure, thus she resorted to her final straw. She sent a private call to her cousin, Jorden, back on Mars. She suspected that since he never made contact after the initial transmission, he'd somehow been infected alongside the others. Still, she hoped he was coherent enough to read her message and hopefully coordinate with her efforts.
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Doctor Jorden Gray, Age 43, Biological Researcher, Science Division, Mars.
