"It's shrinking?!" Tiff backed against a wall, just watching her friend.
Katie continued to rub at her pussy, even as the slit began sealing itself shut, like someone was pulling an invisible zipper. Katie continued to rub frantically at her clit, moaning in ecstasy as it began to swell. Soon she was rubbing the swollen thing between two fingers as it migrated upwards a few inches.
It began to grow larger, and push out from her crotch. Soon it resembled a glans. It began to push out further as a shaft lengthened from her body, stopping only once it was a full eight inches in length, and easily three inches thick. Katie wrapped both her dainty hands around the shaft, pumping it wildly as she continued to moan. The skin below her new organ began to expand pushing out in a loose wrinkly flap of skin. The skin popped open as two egg sized orbs suddenly dropped inside it.
With a sudden scream, Katie stopped her pumping as her new testicles churned. Her first orgasm with her penis made her back arch, covering her stomach and chest in a load of white cream. After a few panting breaths she came too, looking down herself at the semi-soft organ. She issued another scream, trying to back away frantically, and became even more horrified as she came to realize it was hers.
"Tiff! What happened to me?!" Katie looked to her friend, panic on her face.