Adult usage only. May produce NSFW content.
One day things changed drastically, a second puberty was added during which everyone developed a second set of genitalia of the opposite sex from their originals. Everyone's bodies changed to be as if this was always the case, but nothing else did, their clothing did not change with them.
Men grew breasts rapidly, and gained a vagina, women grew a penis.
It happened on a Wednesday. First, information was gently inserted into everyone’s mind, information about what would soon occur.
Going forward, people between approximately the ages of eighteen and twenty-five would undergo a sort of second puberty: they would develop into fully functional hermaphrodites. The majority of people will have this hermaphrodation occur between twenty-one and twenty-three, with only about five percent having it occur before twenty.
For males, this would take the form of developing breasts, loss of chest hair above the bottom of the rib cage, a slight widening of the pelvis and the growth of a second reproductive system, a female one. This process generally takes six months, though breast development may continue sporadically well into one’s late twenties.
For females, the main physical changes would be mainly limited to simply developing their male reproductive system, with few or no other visible changes. Development of the male reproductive system generally takes only three to four months for females.
These, however, are only the most common outcomes, and the tail of possibilities is long. For instance, it is entirely possible, for example, for a male to end up with an entirely feminine appearance by the end of this second major sexual development period. Or the opposite for someone born female, or anything in between. A person’s desires can have an influence on this, for example, a closeted trans woman is more likely to end up with a feminine appearance. These outliers may take a year or more to fully change into their new appearance. Though the majority of people do follow the rules above.
The last thing that changes is sexual preferences, those attracted to men gain an interest in breasts on men. Everyone gains new urges and reflexes related to their new parts and mostly gains an …
Bailey and Ayden, a college-aged couple, discover that Ayden has a power in the middle of a post-coitus massage. In short, Ayden can enter someone through an orifice and "wear" them, essentially possessing them, turning them into a sort of skinsuit as he does. Being an anal aficionado, Ayden prefers the obvious entry point. What follows is Ayden using his powers on others, such as their petite neighbor, the obnoxious TA that's ruining Bailey's GPA, and eventually culminating in Bailey's professor. Of course, the couple has plenty of sex along the way.
Discovery
"I-I mean, SERIOUSLY?! LOOK!" Bailey shouted, pointing at her phone screen. "Who LOSES credit for being early to class?!"
"...Wow." Ayden sighed, caressing Bailey's thigh as he pretended to stare at his girlfriend's phone. "Not to be that guy, but... why not just show up like, on time instead?"
"You REALLY think Kim's not gonna find something else to find wrong?! God, you know that test last week? Gave me a FORTY because 'blank ink is in poor taste' AFTER last time! Can't use a pencil, can't use a pen, lemme guess, I gotta prick my fucking finger and write with blood?!" Bailey shouted, her face red from her frustration. "I cannot WAIT to be done with this shit!"
"...Want me to talk to your professor or... something?" Ayden asked, gulping as Bailey snapped her head towards him.
"Babe, I..." Bailey started, her tone harsh. Upon seeing her boyfriend's face, however, she paused, took a deep breath, and tried to relax. Slightly. "Look, I just..." Bailey sighed, averting her eyes. "Kim'll start rumors the second you close the door behind you. Doesn't matter if it's her, the professor... the janitor, honestly."
"And?"
"Ayden. You really want a rumor to start about you... doing something to some poor, defenseless, helpless woman behind closed doors?" Bailey sighed, rolling her eyes as Ayden's expression didn't change in the slightest. "She'll say you raped her. Or both of them, knowing her."
"Oh." Ayden mumbled, biting his upper lip. "Yeah, that's... not great."
"No shit." Bailey sighed, flopping her head back on the pillow. Covering her gray eyes with her forearm, she finally noticed her boyfriend's hand. "Babe, what are you doing?"
"...Rubbing your thigh."
"Not in the mood."
"Maybe Kim-" Ayden started, immediately stopping when Bailey's glare peeked out from beneath her …