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The basic idea behind the Woman You Become series is to create a few short, punchy, sexy self-insert stories that include all of my different methods of gender transformation (and a few others I'll probably come up with along the way - Magical Girls, Magic Spells, etc). But the first title: The Woman You Become: Natalie, will feature a Gynethrope. (gyne = ancient greek for 'women,' like in 'gynecologist')
To differentiate Gynethropes from Werewomen, Gynethropes are not cursed, or transformed by magic, and their transformations are not confined to time-spans. A Gynethrope is a person who, either by birth or by accident or by design, has the genetic capability to change sexes under sex/arousal/romantic/reproduction-related stress, like some species of fish and amphibians.
My basic idea is this: evolution recognizes that human higher sentience has led to the development of personality, individuality, and gender identity, which is sometimes at variance with the apparent sex of the physical body and can cause great physical and mental stress that can lead to either serious artificial body alteration, the long-term unhappiness and depression of the individual, or in extreme cases, even death.
In addition, evolution decides that human mating rituals have become somewhat arcane and confusing - instead of just shacking up with a compatible mate of whatever the preferred sex is (nature includes lots of same-sex pairings), humans have to LIKE each other, too. That means lots of people have trouble finding satisfactory mates and many end up in unsatisfactory pairings that lead to physical and mental stress that is unhealthy for the organisms involved and for the reproductive potential of the species.
To solve both of these problems, evolution decides to build into humanity a 'safety valve' of sorts - a gene sequence that, when activated in an individual who is 18 years of age or older (sexually mature), allows an individual to change his or her or their sex to become whatever would be optimal or desired for the purposes of copulation, mating, and/or reproduction: men can become women, women can become men. Non-binary and intersex people can become whatever configuration they want to be. And you can stay that way, or you can turn back.
There are a couple of caveats, however: 1) This is a sex/arousal/romantic/reproduction-related stress-activated gene sequence. Someone who is not actively gynethropic already will not suddenly become gynethropic unless some stress or intense tension surrounding sex/arousal/romantic/reproduction-related issues arises. For example: If you carry the gene and are a male individual who is regularly in an all-male or heavily-male environment (such as a football team, or a biker gang or bunch of bros or something -- even something as every day as two or three male roommates living together) and you or some of the guys in the group start seriously angsting over being lonely or having gotten dumped in a bad way, or something, the genes you carry might become active, allowing for you to transform into whatever the nearby source of angst desires, or into a form that would allow you to copulate with a prospective partner nearby --- if the source of the angst is one of your teammates, or a friend, or a bro, or a roommate, or something, and he is straight, then with the right catalyst (we'll call it catalyst X for now), you can become female. You'll need some of that catalyst every time you transform from male to female going forth, and a steady diet of it to remain female until you first conceive (after which you're locked in.)
If, however, the source of the angst is you, and you have male, female, and/or non-binary/intersex potential partners in your regular environment, your genes may activate and allow you to transform into a female if you have some of X catalyst (if say your prospective partner is a straight dude or a queer girl), or into a futa form, if you have some of X+Y catalyst (if your prospective partner is a bisexual/queer dude or a bisexual/queer female). Futa transformations are difficult for most people to achieve, though, unless they plan for a way to be able to have access to both forms of catalyst simultaneously.
2) If a person goes from female to male under the catalyst, or from whatever to futa, the transformation can only be locked in if you can remain in that form consistently for a year. For a female-to-male transformation (an androthrope), this would mean a steady diet of catalyst Y. For a futa, a steady diet of Catalysts X and Y.
3) Catalyst X is (at this point in my conceptual plan) Semen. In other words, in order for a male individual with an active gynethropic gene sequence to become a woman, he would need to consume some Sperm, either orally or anally. Once female, she can consume it orally, anally, or vaginally to retain her female form. She'll need a regular diet of it to stay female, unless she conceives: at least one full deposit of fresh cum every 72 hours or so. 72 hours after her last dose of semen, she start yearning for it, a hunger that isn't hunger, and have about 12 hours to get some sperm or change back.
Catalyst Y is female arousal fluid. The only way to acquire it is to eat a woman out during sex. So if you're male, in a sexual encounter with a woman, and you consume a bunch of your own cum and also eat your female lover out in the same sexual encounter, and you have an active gynethropic gene sequence, you can become futa.
4) The gynethropic gene sequence is not blind to sexual orientation: a male who is exclusively attracted to men and in an environment populated by other gay men will not suddenly become female if he consumes cum while under sex/arousal/romance/reproductive-related-stress. If, however, he is attracted either exclusively or in part to men and in an environment with only or primarily straight men, then if he has an active gynethropic gene sequence, he will become female. Thus, he will have the 'opportunity' to 'mate' with one of the straight men in his/her environment. He can reject that opportunity if he doesn't want it, but he'll still have it.
5) A transformed gynethrope who is currently female who needs to change back into a man can do so after 12 hours. They'll need another dose of cum before they can become women again, though.
6) This evolutionary change to humanity is very recent: it only began within the last few hundred years. For that reason, the percentage of people who are born with the gynethropic/androthropic gene sequence is very low at present: less than .02% of the population thus far. Even more negligible outside of the US. It may take thousands of years before a significant percentage of the population become genetic carriers of the gene sequence. That means that the number of people born with the gene sequence is incredibly low, and the number of people who will ever activate it AND successfully transform is even lower. For that reason, the existence of gynethropes/andropthropes is considered nothing more than an urban legend, and people who have it work very hard to not let the wider world find out.
7) However, some people DO become aware of the existence of gynethropes/androthropes, and actively seek the gene sequence out. If you're not already a carrier of the gene sequence, a blood transfusion from someone who has it will transmit the retrovirus that implants the sequence in humans to you. And there are a few places in the online world where you can meet people specifically for that purpose.
8) And if you already have the gene sequence, or have acquired it, you can activate it on purpose by consistently putting yourself in an environment wherein there is a source of sex/arousal/romance/reproduction-related-stress. Once the gene sequence activates, anyone who has not already been having gender-transformation related fantasies will begin having them. Anyone who has already been having them will find their fantasies increasingly difficult to resist. Then all you need to do is consume some of the catalyst during a sexual encounter, and ... whammo.
So what do you think? Gynethropes sound cool?