Jess picked up the vial with a silhouette of a humanoid figure. It looked human except for two points at the top of its head and distinctly hoofed feet. She had a pretty good idea what this figure was, and quickly popped off the cork.
The liquid smelled like a potent drink. Just smelling it gave Jess rosy cheeks and a big smile. She easily downed the entire thing in one gulp. She hiccuped, bringing one hand up to her mouth. She and Mary shared a giggle.
"That was daring, taking all of it," Mary said. "I hope you really want whatever you picked out."
"Oh," Jess sighed as a warmth spread over her body. "I definitely do." In fact, the more time went by, the more she meant it. She could feel the changes begin across her legs and stumbled to sit on Mary's bed. She quickly undid her shoelaces and pulled off her pants as dark, coarse fur pushed its way out of her skin. A lump began to pull on her panties, and Jess took those off as well, no longer caring if her entire body had to be naked through the transformation.
In fact, the very next thing she was inclined to do was remove her shirt and bra. They had barely begun to feel constricted, but Jess' motivation was more of a sensual desire than anything else.
As Jess laid back on the bed to experience her transformation, Mary's cat-like eyes widened. She had never seen Mary acting so...sexy. Usually she was a relatively reserved person, acting shy when the two went out to bars and other places to meet guys. Obviously the transformation was affecting her mind as well as her body.
The dark brown fur had completely covered Jess below her waist. It grew up her stomach in a point whose tip ended at her navel. Jess could feel a short tail sticking up from above her rear. Her scalp tingled as the hair atop her head pushed out farther. She began the transformation with a shoulder-length bob, but the strands were now curling upon themselves and spreading across the bedsheets.
The combined sensations of growing fur, lengthening hair and expanding breasts sent Jess into a surreal mindscape. She no longer saw the room she was in, despite her eyes being wide open. She saw nothing around her at all, her senses completely blocked off in order to concentrate on the warmth of her transformation. She began to rub her breasts and pleasure herself, not once questioning whether or not she should do so in front of Mary and on Mary's bed.
Her legs changed structure. Her calves thickened and her feet pushed themselves longer. Toes hardened and turned into smooth black cloven hooves. The fur between her ankles and hooves grew four times as long and darkened even further to total black, making a feathering that almost completely obscured her hooves.
On her arms, a similar thing was happening. More brown and black fur emerged starting at her wrists. The strands grew long there, and tapered as they approached her shoulders, stopping there. Jess now had three-to-five inch forearm fur that could cover more than half of her hands. Her fingernails darkened to match her hooves, though her hands themselves lost none of their delicate feminine qualities.
Her breasts had grown immensely, their perfectly rounded forms graced with two-inch-wide nipples.
Finally, two black points broke through the mass of tangles on Jess' head. They lengthened to reveal themselves as ribbed horns. They grew from the top of her head and curved slightly back. Their growth slowed at half a foot and the rest of her changes subsided as well.
Now that the changes were over, the fog of ecstasy lifted from Jess' mind. She removed her hand from her vagina and blushed, realizing for the first time what she was doing.
Mary was too busy staring in awe at Jess' new form to be concerned about that, however. Her friend was now a beautiful satyress with hip-length curls and breasts a supermodel would be jealous of. The smell of her alluring pheromones invaded Mary's sensitive nostrils, and the catgirl suddenly began to heat up. She jumped when she realized what she was thinking about, and attempted to rationalize the alien desires that had just entered her mind. She tried to convince herself it was only an effect caused by Jess' new form and Mary's cat nose enhancing their potency. Still, she couldn't help but find an irresistible attraction to Jess now.
The satyress stood up, learning how to balance on her new hooves. She looked at herself in Mary's vanity mirror and struck a sultry pose.
"A big improvement, wouldn't you say?"
Poor cat-like Mary could only nod in agreement as her own eyes darted over to the now-refilled Satyr vial in the box.