Jeffrey Laforet couldn't help but think of his girlfriend, Jennifer O'Brian, and how her overprotective mother Shannon couldn't accept to see her daughter dating anyone. Not that he could blame Ms. O'Brian after what she lived trough. Not only had the poor woman been abandoned by her first husband once he learned she was pregnant with his child, but her second one had been killed in a traffic accident only a couple of days before she gave birth to Jenny.
So first, Jeff created a new kind of weddings. While the classic kind still existed, it would automatically be adulated if it got in the way of a wedding on the new kind, which is made by God himself when he find two peoples that would be absolutely perfect with each others but have some very hard obstacles in the way of their union. When you meet peoples united in a divine wedding, you can feel them being wed that way, almost like a 6th sense. Naturally, he made Jenny and him have that kind of union and validated.
While it made almost everyone in the world accept them as spouses regardless of their young age, (16 is a bit young to be married) there was still some peoples who didn't, and alas Shannon O'Brian was among them.
So Jeff made one other modification to the world. Now, when God feel the need, he can decide to turn a human into a parasite and make said parasite take over the body of another human. God never explain why he make someone take over someone else body, but in Jeff's case it's easy to guess why he was made to take over Shannon's.
As a result, he is both a woman called Sannon O'Brian, with all the knowledge, memories and responsibility that goes with it, including being Jenny's mother, but was also the young boy named Jeffrey Laforet, Jenny's husband, with all his knowledge and memories.
As a parasite, Jeff greatly increased his new body's regeneration, visibly making it go a back to its peak a bit more every day. Wrinkles disappearing, boobs sagging less and less, …
And while his body was clearly the one of a woman, with all that implies, Jeff also had his fully functional pennis, although it was now retractile, a bit like a cat's claws, safely hidden inside a special pocket inside his vulva.
In this new reality, Jenny had initially been weirded out by suddenly finding her so attracted to her mother's body, wanting to sensually caress it and be caressed the same way in return, to love its inhabitant aromatically, to have the feeling returned. It was only amplified by the fact she simultaneously loved that person as only a daughter can love its mother, somehow. And Jenny knew Jeff also inherited the motherly love Shannon always had for her, on top of his own feeling. But she rapidly learned to accept it, love it even, and so did her two siblings.
The last change he caused was to make sure Shannon had more than enough money to take care of her children every need.
— – - – —
Latter, Jenny found the older redhead in their living room, looking at the family's photo-album, a melancholic look on her face. "Are you alright mom?"
Said mom raised her head. To Jenny's surprise, she currently had blue eyes and an Adam's apple. ‘Oh, he's currently in Jeff-mode.’ The aforementioned then said "Oh, hi Jen. I hadn't heard you. To answer your question: Yeah, I'm alright. I just feel strangely melancholic looking at all those memories, even though they aren't mine. Heck, most of them even happened before our birth!"
"That's because when you took over mom's life, you inherited all of her experiences." Then, wondering what was all this about, Jenny asked "you're not having cold feet are you?"
"Naah. I know divine weddings don't need any ceremonies, but I also know how much you always wanted one."
"I really wish my mom could help me choose my dress trough…"
At this, the older redhead Adam's apple disappeared while eyes turned back to green. In her motherly voice, Shannon then answered. "I know sweety, but your mother is also the groom, and it bring bad luck to see your bride in her wedding dress before the ceremony."
"Say, are you sure you want to wear a tux? I wouldn't mind you wearing a wedding dress of your own, you know."
"Absolutely. I want to make sure people understand you married Jeff Laforet and not your mother. Plus, I already wore a dress two time and it never ended well, time for a change."
"I understand what you mean, but I am married to my mother. And you know what? I love every second of it!"