Author's Note: Standard disclaimer: this story contains graphic depictions of sex and mind control, so if you shouldn't be reading this, stop now! All characters are 18+, all situations are entirely fictional, and any resemblance to any real-life individuals or situations is entirely coincidental. Copyright Fidget, 2021. All rights reserved. Enjoy!
Human Reproduction
by Fidget
Chapter 1
Dr. Jeff was trying to finish wiring his new device before his Intro to Bio class started, but it was starting to look pretty unlikely. As a molecular biologist, designing machines to improve concentration wasn't really his field (and to be honest, he was fairly certain he wasn't supposed to be using university equipment for personal projects either), but some amateur research into the effects of certain frequencies of sound on the human brain had led to a few epiphanies on his part, and he was so close to finishing. Students were already filing in as he sat at the front of the room, fiddling with the device hidden in his backpack in impatient desperation.
He'd gotten the idea after seeing how hard some of his students found studying, and hoped that his new device would help them focus and increase recall. And, if the profits from his little side project were enough to materially supplement the pittance he was paid by the university for his biological research, so much the better. In his haste, however, Dr. Jeff bridged two circuits by mistake and was treated to a loud pop from the mistreated device, and then a noticeable hum filled the quiet air of the classroom. The unexpected noise startled the students, but Dr. Jeff assured them that everything was fine before zipping up his pack in disappointment and looking over his notes for the lecture.
So much for finishing before class. At this point he'd be lucky if the machine was even salvageable. The loud hum coming from his backpack was still clearly audible to everyone in the classroom, but Dr. Jeff didn't have time to try to fix it before class began, and figured that everyone would habituate it soon enough.
He watched as the last few students filed in and took their seats, letting his eyes linger on some of the attractive young women perhaps a few seconds longer than strictly appropriate before glancing down at his notes for the day. Ah, Human Reproduction. His freshmen likely knew all of this information already, so half the class would probably just giggle at everything he said while the other half dozed off, but even so Dr. Jeff thought this lesson was an important opportunity to teach his eighteen and nineteen year-old students about the risks of sex in the context of biological processes, and so he made a point of being up front and brutally honest about the temptations he knew the young women and men in the class were having to deal with.
Megan slid into her seat at the back of class just as Dr. Jeff stood up to begin lecture. The athletic blonde was already eager for class to be over so she could start enjoying her weekend, and the other freshmen seemed to feel the same way, slouching down in their seats as they prepared themselves for fifty minutes of monotony, and only a few cared enough to muster snickers as Dr. Jeff began describing the basic functions of penises and vaginas.
"Dr. Jeff" was relatively young, only in his late twenties, and Megan assumed that he went by his first name in an attempt to connect with his students. To be fair, she thought it worked reasonably well; Dr. Jeff was attractive and well-spoken, and enjoyed a degree of popularity among the students, especially the underclassmen. Megan thought that he was nice enough, even though he gave her a slightly skeezy vibe from time to time, seeming a bit too interested in his female students for her liking, and as the lecture progressed into almost a manifesto on the dangers of sex, she began to think that his views on the subject were perhaps a bit out of date as well. Still, he'd never done anything overtly inappropriate that she knew of, and he was nice to look at.
She'd noticed the odd humming noise filling the air when she first walked in, but didn't think much of it, and less than a minute later she'd forgotten that it was there at all. As Dr. Jeff continued to speak, however, she found herself paying more and more attention to his words, and if she'd had the wherewithal to look around the room, she might have noticed that all of the other students in the classroom were doing the same. Five minutes into the lecture, every student, Megan included, was on the edge of their seat watching their professor with rapt attention, and the intermittent giggles had been replaced with an intense silence broken only by Dr. Jeff's words and the relentless hum coming from the backpack on his desk.
Having finished his discussion of reproductive anatomy, Dr. Jeff took the opportunity to directly address the women in the classroom.
"And so all of the young women here should keep in mind that your bodies are trying to get you pregnant, whether you want them to or not. There's nothing malicious about it, of course - they're designed to want to engage in reproductive behavior, and it's how we make new people to continue the human race. But you have to be aware of it. Your young bodies know how fertile they are at this age, and they are constantly trying to convince you to put yourself in a position where you're likely to get pregnant, flooding you with powerful sex hormones that influence your behavior, even if you don't notice it, goading you toward intercourse.
"You're instinctually drawn to the bodies of your male peers, just like they're drawn to yours. You're driven to flirt with them and tease them as your body temps you to give in to your urge to reproduce. That powerful need for male attention you feel from time to time is your body encouraging you to show potential mates that you're fertile and ready to breed. And that pleasant tingly feeling you get when he returns your affections is your body preparing you for intercourse and impregnation, lubricating your vagina to make it maximally stimulating for any erect penis your body can convince you to slide inside.
"Those of you who have had sex know how powerful the need is in the moment, and how badly you want him to finish inside of you. Again, that's your biology trying to get you successfully impregnated, and once he ejaculates, the process of pregnancy and childbirth from there is involuntary and automatic. And so, nine months later, thanks to your evolutionary need to engage in human reproduction, you will both have successfully procreated, and your genes will live on in another generation.
"I know this discussion is a bit blunt, but being aware of all of this information is important."
Megan was still on the edge of her seat, paying uncharacteristically close attention to the off-topic and out-of-date rantings of her professor as the odd humming sound that she'd completely forgotten about kept her mind open and attentive to his words. Despite her short-lived initial boredom, she now found herself enthusiastically nodding along with Dr. Jeff's lecture; she couldn't help but devour his every word, and she couldn't prevent them from deeply embedding themselves in her psyche.
She'd never really thought about it before, but now recognized that it was undeniably true: her body was trying to get her pregnant. Megan was a bundle of instincts and sex hormones whose efforts were entirely focused on convincing her to mate with a virile male. There was nothing she could do about it - Megan had the body of a fertile woman, and it was programmed to do everything that it could to pass her genes on, with or without her permission.
Hell, now that she was thinking about sex, she could already practically feel her body pumping her full of chemical desire in the hopes that she'd be driven to seek out a potential partner, flirt with them and draw their attention to her fertile, feminine body, and get herself impregnated. It was so easy to give in to her body's temptations too. Even thinking about the effect her flirting would have on the men around her began to fill her with that pleasant tingly feeling that she now recognized as her body involuntarily preparing her for sex, and try as she might to ignore the feeling, the warmth between her legs continued to grow, as did the appeal of seeking out a suitable mate. It really wasn't fair how easily her body could make her want to impregnate herself like this - it was a good thing she had Dr. Jeff to make her aware of this important information.
Her head still full of that insistent humming, Megan briefly glanced around the room, taking in all of the sexy, available guys whose eyes were still unflinchingly fixed on Dr. Jeff as he continued to speak. They all seemed so strong, so masculine, and as turned on as her body had made her, she suddenly wanted to feel all of them finishing deep inside her dangerously susceptible vagina.
Caught up in the seduction of her body's irresistible sexuality, Megan didn't notice that all of the other young women in the room, of all shapes and sizes, were hungrily looking around the room as well. If she had noticed, however, it would have seemed obvious: they each had their own unique set of genes to pass on, and their bodies were just as evolutionarily driven as hers was to do so.
"And you men!" Dr. Jeff continued. "You're all more than familiar with your own instinctive pull toward women's bodies, how much you like to look at them, and how appealing and arousing the female form is. This is because your young bodies are flooded with testosterone that's constantly making you want to slide your penises into their vaginas, where you'll inevitably lose control, inseminate them, and ensure that your DNA reaches the next generation. You're all aware of how strong this urge is, and that when you say 'just the tip, just to see how it feels,' you already know that it's going to feel great to both of you, and that she's much more likely to continue once her own sex hormones are pumping during intercourse. And once you're inside, her body is designed to feel great, to tempt you to thrust one too many times and to make you not want to pull out as your body involuntarily impregnates hers.
"After all, you all know how sensitive your penises are, and how good it feels to stimulate them. Plus, you know what it feels like when your ejaculation reflex is triggered. You know that once that happens, if you're inside a vagina, there's nothing you can do to stop it, and your body will fill hers with your genetic material whether you want it to or not. And if that happens, there's nothing either of you can do to prevent impregnation. Both of your bodies will have done what they've been designed to, but while the effects on yours will just be a temporary, pleasant sleepy sensation as your body rewards you for merging your genes with hers, the effects on her body will be nine months of pregnancy and then childbirth.
"And even knowing all of this, you're still going to do it anyway. You can't help it. Women's bodies are trying to get them pregnant, and your bodies are trying to impregnate them."
Back in the last row of seats, Megan continued intently listening to her professor's lecture as the undeniable truth of his words filtered through the ever-present humming in her head. Guys were always going out of their way to look at her body, and while she had always known at some level that that was an indicator of their sexual interest, her awareness of it was a lot more visceral all of a sudden.
It was remarkable how effective the system was: her body was constantly trying to draw male attention so she could titillate them and convince them to mate with her, and their bodies were always directing their gaze at her so they'd get physically aroused and want to stick their dicks in her tight little pussy. With how much the actions of everyone involved were mutually directed toward getting guys' sensitive cocks into her fertile vagina where they could spurt her full of cum, it was a miracle that she'd made it this far without managing to impregnate herself already, especially with how much her body clearly wanted her to.
Megan herself didn't even especially want to be pregnant, but her body certainly did, and that seemed to be all that really mattered at the moment. Even now the pleasant buzzing of her vulnerable, lubricated pussy continued despite her half-hearted protestations, and she couldn't stop herself from glancing guiltily around the room again at all of the attractive guys. It was just too tempting; her body wanted it too badly, and so she continued to drive her desire even higher in spite of herself. From the way the men's pants were now noticeably tenting under the tables, she knew that she wasn't the only one whose thoughts and behavior was currently being influenced by their reproductive instincts. It didn't help that her body was already fully prepared to get to know those cocks much more intimately, and she couldn't resist biting her lip and pulling her shirt down a bit in a subconscious attempt to focus their physical arousal on her.
Once again, Megan didn't notice that all of the other fertile young women around the room were doing the same thing, but she did notice the couple of guys leering at her display, clearly physically aroused by her body. They too were understandably caught up in the overwhelming feelings of sexual desire the testosterone flooding their bodies had filled them with, just as Dr. Jeff had said they would be. Megan squirmed in her seat at the thought, hating how much she loved the feeling of her waterworks ramping up, preparing her body for intercourse with these virile, overtly interested males.
All the while Dr. Jeff continued to lecture, completely unaware of the reproductive realizations his words were stirring in his students. He had noticed that they were oddly attentive today, and that they had started behaving more and more strangely as his lecture proceeded, looking around at each other with intense, flushed looks on their faces, but in his preoccupation with ending class so he could get back to his device he failed to make a connection between it and their unexpected behavior. Figuring that he'd covered the basics well enough, and that he'd lost their attention by now anyway as his male and female students hungrily stared at each other, he ended class fifteen minutes early and retreated to his office, where he finally got that damn humming to stop and resumed work, unaware that his project had already succeeded, after a fashion, and that all of his future attempts were doomed to failure.
Mason had just gotten back to his dorm room after class, trying to hide the erection that was still pulsing against his torso after Dr. Jeff's enlightening lecture. He now recognized that this was because his male body was always ready and eager to impregnate all of the attractive young women around him, and that he needed to be careful to make sure that didn't happen, especially now that he knew how strongly women's bodies were trying to get them pregnant. Combined with his own powerful sex drive, it was a miracle that he hadn't already knocked up one of his female classmates. They were all so enticing to him in their own ways, and he couldn't deny how much his body wanted to see what it felt like to lose control inside each and every one of them.
And so, when he noticed Megan's appealing feminine form swaying down the hall toward him and the intensity of the lust in her eyes, his mind hummed with his newfound certainty that he wouldn't be able to resist her advances. Their reproductive instincts were just too strong.
All too soon she had reached him, and he drank in her floral scent and the intoxicating look of flushed arousal on her pretty face as she began to speak.
"Hey Mason, I was thinking about what Dr. Jeff said in class today, and, um, I realized that he was right. My body is trying to get me pregnant. I have all of the symptoms he mentioned." Her voice dropped to a seductive purr as she began to brush her soft curves up against his hard, lightly muscled body. "I'm young, and my body is flooded with sex hormones, driving me toward reproduction whether I want it to or not. I couldn't stop my vagina from lubricating itself, and so now if you stick your cock in me you're practically guaranteed to cum."
She looked up into his strong face with an odd mixture of reluctance and uninhibited arousal. "I'm sorry to be doing this to you Mason; I know Dr. Jeff said you won't be able to resist your need to impregnate me, but I just can't help flirting with you - it's too tempting to give in to my sexual urges, and my body wants it so badly!"
"I know what you mean," Mason said as her hip began to press suggestively against the bulge in his pants. "Ever since class, I just can't stop thinking about how much testosterone I have," he said, flexing his arms and enjoying the sight of her eyes glazing over with need, "and about how much it's constantly driving me to mate with all of the hot girls around me. Like you. You touching me like this already has my cock hard and throbbing, and I can't stop thinking about how if I squeeze it into your tight, slick vagina, I won't want to stop thrusting until you make me cum," he said, his breath growing ragged as he opened the door and she pushed him inside.
"It's not your fault," she cooed reassuringly as she unzipped his pants and stroked him through his boxers, watching the hunger in his eyes grow. "It's not either of our faults. It's just what our bodies are programmed to do, and there's nothing we can do about it."
"I know," Mason responded, pulling up her shirt and enjoying the view as her smooth, tight abdomen and small B-cups came into view, already knowing just how good her body would feel but intensely needing to experience it nonetheless. "Like, pulling up your shirt like this is definitely a bad idea, since seeing more of your skin just makes my body want to press itself up against yours more, and from there it would be too easy and too tempting to slide my cock into you, but I just can't help it," he finished as she eagerly pulled his boxers down and his erect phallus sprang into view, dripping with precum and all too ready for the exhilarating sensation of penetration.
"Yeah, I know how dangerous that would be," Megan answered breathily as she wrapped her arms around his torso and pulled him against her, enjoying the exciting sensation of her skin against his as her traitorous body began shifting her hips to stimulate the hard cock pressed against her abdomen. "But now that my body has your cock out in the open, it's just making me want to rub myself up against it even more so that you'll start to crave the sensation." She backed him up against the bed, and Mason finally gave up all pretense of resistance as he pulled her down on top of him and enjoyed feeling her small body slowly sliding up and down his as she settled into position.
His cock nestled comfortably into her thigh gap and was soon rubbing up against her lips, where it was soon coated in the slickness of her arousal and aching for insertion.
"Oh god, I can't believe I'm about to fuck a guy I barely know without any protection!" Megan moaned, teasing the entrance to her soaked pussy against his tip to drive both of their arousal even higher and ensure copulation. "My body just won't stop trying to get me pregnant! It's flooding me with sex hormones and-" she gave a high-pitched gasp as she slid down one final time, feeling her labia part all too easily as his straining cock finally began to penetrate her. "-keeps sending my brain signals that it feels so good! I guess I'm just a slave to my reproductive instincts after all," the cute blonde sighed as she felt Mason's dick enjoying the sensations of her tight entrance, knowing that the slick embrace of her pussy would involuntarily lead it towards orgasm.
Mason let out a powerful grunt as the sensation of sliding the sensitive head of his cock into Megan nearly overwhelmed him. "I know what you mean. It's like instinct is completely overriding my free will. Even now I'm thinking 'maybe I'll just slide the tip in,' but ungh-" Unable to hold himself back any longer, Mason's hips bucked, and he found himself fully thrusting into Megan's inviting depths, where the sensations only magnified themselves and made him want to do it again.
Megan too was just as caught up in her sudden sensation of satisfying fullness, like she was doing exactly what she was supposed to, and in her excitement she began moving her torso up and down Mason's body once more, needing to feel that sensation again and again, regardless of what it was doing to Mason's dangerously sensitive dick in the meantime.
Mason could feel the sensations starting to build as Megan's movements sent his eager cock sliding into her tight hole over and over again. He knew all too well what was happening to him as her pussy continued to pull at him, but he couldn't stop his arousal from building toward the point where his body would react with spontaneous finality, and would begin filling his enticing feminine partner with his potent cum whether he wanted to or not.
Her body was acting out its role as well, milking his cock and pulling at his dwindling resistance, cajoling him to embrace the pleasurable sensations and voluntarily stimulate himself inside her up to the point where control would be taken away from him.
Mason knew it was coming, but it felt too good to pull out at this point, and so he didn't. His body wanted this too badly, and as the sensation washed over him and his dick began to involuntarily tighten, just as Dr. Jeff had said it would, there was nothing he could do to stop it. He instinctively gripped Megan's smooth torso in his arms and powerfully thrust his hips up into her one final time, holding her in place as his dick inevitably began to pump, dumping an overwhelming load of his genetic information into his fertile classmate. He knew that her sexy body had gotten exactly what it wanted out of him, but he was unable to feel anything other than dazed satisfaction at that knowledge as his hips continued to involuntarily buck, and his body rewarded him with pleasure for giving up his seed.
Megan was just as compelled by instinct to sit there and accept the catalyzing essence her body had caused his to expel, overwhelmed with pleasure at having fulfilled her own reproductive role of allowing herself to be inseminated. All the while, she reassured herself with the thought that it probably wouldn't take even as her body began combining his genetic material with her own. Even so, she knew there was nothing she could do to prevent her body's natural reaction to having her mate's potent cum inside of her, but she also knew her body had wanted her to get herself pregnant in the first place, so whatever happened wouldn't be her fault. Or Mason's, for that matter.
"Wow, our bodies really wanted us to mate today, huh?" Mason asked as he slowly withdrew his deflating cock from the cute girl's tight pussy. His head was swimming with primal contentment even as he reflected on how quickly his sexual desire for Megan had faded now that he had successfully impregnated her.
"I know! Dr. Jeff was totally right!" she said, feeling his potent cum ooze out of her fertile, eighteen year-old body as she rolled off of him and stood up, still a bit weak in the knees. "Oh man, my instincts and hormones have really done it to me this time. Oh well, there's not really anything I could have done to prevent it. I just couldn't help myself! My lizard brain made me notice how manly and sexy you looked, and I just felt so flirty all of a sudden, and the next thing I knew I was throwing myself at you! It's no wonder you wanted to mate with me - my body was tempting you sexually in every way it could think of!"
"Ugh, I know!" Joey muttered, a bit miffed at just how easily his own sexual instincts had manipulated his behavior. And now the deed was done. He could still feel his oversensitive dick tingling slightly with the lingering aftersensation of his fateful orgasm as he pulled his boxers up and tucked it back inside. "When I saw you approaching with that look on your face I already knew what had happened, that your body was trying to get you pregnant, but by then it was too late. I'd always thought you were cute, so when you came up and pressed yourself against me like that, I wanted you to do it, even knowing what it would do to me.
"I'd already noticed how sexy you looked today for some reason, and then your soft curves felt so good that my dick started throbbing with arousal. Once that happened it was like I could feel the cloud of testosterone flooding my brain, and then all I could think about was getting my cock into your tight pussy where you could make me cum! I knew what might happen if I did, but my body wanted you so badly, and once I was inside you the sensations kept getting stronger and more intense until I just burst! I know there wasn't anything I could do to resist, that cumming in you like that was an uncontrollable reflex, but I still feel kinda bad about it. You're the one who might have to deal with the result of my body's need to get its rocks off for the next nine months."
"There's no need to apologize - I know it's not your fault. You're just as much a product of evolution as I am, and my body clearly wanted to be impregnated today," she said as she slid her panties back over her flared hips. The crotch darkened slightly as his cum continued to ooze out of her, and then she slid her skirt up her shapely legs and back into place, completing the sexy look that had helped draw Mason's attention to her in the first place. Now, however, the shapely torso hidden by that skirt had accomplished its evolutionary purpose; it had been filled with Mason's cum and was working hard to complete her impregnation even as she continued to respond. "Once you were inside me my body was rewarding me with so much pleasure for letting you do it that all I could do was squeeze your cock up into my pussy over and over again, even knowing what would happen as a result. My body was too determined to get your genetic material - it's designed to tease it out of you, and your body is designed to lose control and pump me full of cum, so of course there's no way you could resist."
"Well, I guess there's nothing we can do about it now, anyway," Mason said, pulling her into a friendly half hug that lacked any of the sexual intensity of his embrace just minutes before. "Damn, Human Reproduction is a bitch. See you in class on Monday?"
Author's Note: Thanks for reading! If you have any feedback, comments, or questions, I'd love to hear from you! If you find yourself enjoying my stories, consider supporting my work on Patreon. My profile is easy to find on Google as fidget1 (Sexstories doesn't like personal links). Patrons get a full two months of early access to my stories, input into which stories I write, and some fun other perks. Every little bit helps, and your support is what enables me to keep doing what I love!