A quick borrow from Monsta with some alterations, I liked the first part very much. :)
Karyn gasped as her groin tingled and began to visibly swell as her vulva tripled in size. Even her lower abdomen bulged out slightly as it grew to accommodate triple sized fallopian tubes, ovaries and a uterus.
Ignoring the fact that Jon was there, Karyn unclasped her pants and looked down at her super sized womanhood. Over sized labia crowded her groin and her normally 1 inch clitoris was now a three inch monster clit! Reaching down to feel her vagina, her fingers were soon lost in the gaping moist chasm that was now between her legs! Good god she was fucking HUGE! Even the most well hung porn star would be unable to fill her cavern of a vagina now!
Karyn glared at Jon and said, "What...the....FUCK Jon?!?"
Jon blushed and replied, "Sorry, It's twisted, I know, but I always had an unsatisfiable woman fetish. The thought of fucking a huge sloppy over sized pussy while the woman lays there bored and craving something bigger turns me on. Don't worry, I'm sure in this reality they have invented over sized dildos and sex toys that can fully satisfy women's new anatomy. Also childbirth for women now is a snap, the baby will just slide out! Surely one day you'll appreciate THAT at least."
Karyn was pissed as hell but she thought about what Jon had said. As a woman she had always feared the pain and medical complications of childbirth she'd have to endure one day and while that was no longer a problem that didn't make this good. No man was ever going to satisfy her the way she looked now. She would never have an intimate relationship beyond getting her giant clit sucked and how many men even want to go down there? So what was left for her a life of just sextoys? Even worse she noticed that her new giant pussy made much more lubricant, she could already smell herself. She pulled up her panties and jeans. Jon smiled as a large cameltoe formed. She quickly realised that this would never do, if she were to get wet at some point her pants would get soaked.
"Jon, this is horrible. I will never get satisfaction without toys and if I'm not careful I'll soak my pants in seconds."
Jon seemed to consider this. "You know, I think I know just the solution." He finally said. "I wish it was standard fashion for women to wear diapers against the leakage."
The stone glowed and Karyn felt her panties morph into a diaper. Her jeans puffed up from the new bulk.
Karyn looked down. At least the cameltoe was gone. "Jon!" She stepped forward, diaper crinkling and rubbing her oversized clit as she went and punched Jon in the face.
