"You wake up in a strange land, surrounded by exotic creatures. You feel a stinging pain on your back and realize you've been branded with a strange symbol. You have no idea where you are or how you got here. "
You glance around, noting all the fresh lush trees and the singing of birds. Unbeknownst to you, you have ended up in a area called the Luskt Woods. Here lust is amplified and denizens are particularly vulnerable to any transformation inflicted by cum, semen, assault or rape. All forms of rape are only intended of the erotic fantasy, with no worry of harm, stds, or violence inflicted. Only wild fantasy. The beasts are churned by a ominous urge to knead and breed. But not to harm, only to lay their seed down as hormones rage through them in primal fantasy, as people are transformed into lustful, but sapient animals. Losing their hands in exchange for gripping claws, hormonal overload pumping over as their balls and cocks or pussies grow bigger, wetter, needier... Churns of hormonal Estrogen and hormonal Testororone driving increasing
Any people infected have a 80% chance to become anatomically female regardless of starting gender. Depending on severity, from anuses transforming into fertile pussies upon mount, to people even growing additional pairs of breasts, or staying with two. Males turned anatomically female may keep on more masculine traits of andromorphs or cuntboys perhaps, such as more muscled frames, still adorned with pussies and breasts, manes as lions, and their original voices. However the curse will anatomically change each one underneath to fit anatomical, kinky desires. Cocks may dwindle away as they sputter last streams of cum, becoming fertile pussies in heat and flushed red with desire if a beast is allowed to corrupt them. Even previously straight people might find themselves sucumbing mentally under unwanted hormones.
The changes will often reflect at least one or the other's hidden desires. With people's darkest desires perhaps being able to subtlety influence their changes.. not in a actively controlled or manipulated way.. But a helplessly subconsciously lubricated ones. Unwanted fantasies inserted by the curse, such as fantasizing what it might be like to be taken. Might happen. In addition.. those who fantasize about changes, might cause the very changes they wish about to happen. Though the amount of control is limited and the changes might often be hormone ridden. (etc: A dream wishing for money will probably not come true. But any unwanted or unprompted fantasy about being taken by a cheetah/lion/tiger/wolf, or sprouting breasts, or gaining a cock, might happen.
The other remaining have a 20% chance to be forced into becoming a dominant male. Starting Gender does not matter or influence your odds. The forests are cursed, cursed to make former adventurers become breed needy monsters to repopulate the world of monster kind from a ancient curse. In addition, while not falling neatly into either camps. People transforming between the two stages, might also be vulnerable to becoming transitioning or becoming anatomically permanent herms, from feminine herms, masculine / male herms.
In addition, the brand you got, may make you vulnerable to such advances. While a normal human ordinarily would have no fertility with a monster. The rune may cause heated fertility. Thankfully you can fight and roll to resist it. But once you sucumb or fall, the rune will cause any slip of lust to allow you to be permanently dominated by any such beast or forced to dominate another. If you become cursed into a dominant, you will be forced to finish and driven by a burning need to rut. Any person who merely wishes or fantasizes about fucking you triggers the curse as a lusty need takes over your mind, turning you into a creature who will live up to your fantasy.
Meanwhile for female transformations. The opposite can occur. Your lower half, if it ever fantasizes about a creature or is defeated in battle, may be forced or involuntarily urged into a state of heat that causes you to spray out your legs and pant as the urges drive both to mate. Everyone is still mentally conscious through out any actions, perhaps horrified but unable to stop themselves, or slowly succumbing.
Too much fucking could however cause one to lose their mind. Or even become a involuntarily Alpha Fuckbeast, where your thoughts of escaping are rotted away by a hormonal need to breed.. Dominating over any previous mental desires or goals.. as the powerful, pumping, hormone hole ridden churning balls begin to turn your brain into just a play thing.. A forgotten rider unable to stop as you become a penis ruled monster unable to do anything but fuck the enterers who end up transformed into females.. Natural harems formed even as previous girl friends found themselves twitching, sprouting cocks, and the men who adored them sprouting breasts and pussies.
But.. the most important rule. Is to have fun, enjoy yourself, and engage with a healthy relationship between fiction and reality! (Story is probably nsfw, so intended for only 18++ audiences)