Sensing her other changes slowing, Mary again focused on her crotch. Her body was being flooded with strange new hormones surging into her bloodstream from her new testicles. She continued to slowly rub her crotch as she felt something stirring in her loins. With a toothy grin and a slight growl Mary began to pick up the pace of her rubbing, bringing her other hand down to massage her crotch as well. She could feel her insides shifting as a thick sheath formed under her hands and as she rubbed the pleasure grew and grew. Slowly a thick cock began to push its way out of her opening. Shivers of pleasure ran up and down her spine as her new cock pushed out of what used to be her pussy. It felt almost like she was fucking and being fucked from the inside at the same time.
Soft rubbing turned to frantic gripping and rough stroking as Mary continued to pleasure her growing cock. Her hands explored it's inhuman length and she realized it was much different than any human phallus. The tip was pointed and tapered, like an animals, and the thick length had inhuman ridges and bumps spread liberally along it. Each time her meaty paw ran over one of these she had to stifle a roar of pleasure, turning it into a deep growl. With a draconian grin she realized that her new member had another gift: she could actually bend and stretch it ever so slightly. Her dick wasn't prehensile, but she had enough control to make sex interesting in a whole new way.
Gathering all her willpower, she dragged her hand along her length one last time, shivering at the feeling of the cool air against her hot shaft. She could feel the changes coming to an end and she didn't want to blow her load before the main event. Flexing a muscle she hadn't possessed earlier she willed her new member to retreat into its thick warm slit, reveling in the feeling of it sliding back inside herself.
Mary grinned toothily as the glanced in the mirror, the reflection that greeted her was undeniably male and monstrous: a huge, buff and extremely sinister looking black dragon.
Jess was going to get a big surprise indeed.