The look on Katie's face was enough to make Tiff worried. Had the contents been poison?
Grimacing, Katie spat on the floor, "I thought that the vial said 'Breast Enhancement', that it might improve my looks."
"Katie! Don't be silly!" Tiff rushed over and hugged her friend, "You're perfect just the way you are."
"Really? You think that?" by the sounds of it Katie was having a hard time believing what she was being told.
Tiff took the vial and nodded, "You don't need any breast enhancement because you're beautiful just the way you are."
She gave Katie another hug, looking at the vial again while she did. What she saw was cause for alarm. In her hurry Katie had misread the vial's poorly written label. Due to the hard to read print she had mentally added another letter to the first word to fill in where some of the letters ran into each other, the vial wasn't 'Breast Enhancement', but 'Beast Enhancement', whatever that might mean.
The frightening answer came all too quickly as she felt Katie's body begin to shift in her arms despite the fact that Katie wasn't moving.
"Tiff, what's happening to me?" Katie's voice came out in a harsh growl as she broke the hug to give her friend a look of horror.
The first thing that Tiff noticed was how Katie's hair was changing, becoming thicker as her hairline grew slightly lower. Instead of resting flat it was starting to stick up a bit, possibly due to how thick it had grown it. It also began to spread, growing down in front of her ears and wrapping around her face until it resembled the main of a lion. Horrified, Katie brought her hands up to her face, allowing Tiff to see her nails curve into thick black claws
Her expression of fear turned to one of pain as her teeth elongated into predatory fangs and her mouth and nose grew out to form a blunt muzzle, making her face seem some strange cross between a wolf's and a hyena's. Poking out from her main, her ears grew large and pointed as they migrated more towards the top of her head. Brown fur was beginning to cover her face.
A ripping sound was heard and Katie let out a roar of pain as her newly formed tail burst from the seat of her pants, rapidly growing to nearly four feet in length. At the base it was as thick around as her upper arm, tapering down to about an inch in diameter at the tip. It was neither feline or canine, lacking any sort of tuft and covered in short, smooth brown fur. In reflection of her pain and fear it twisted and coiled around her legs, showing it to be prehensile.
Still growling in pain and fear Katie tore her way out of her shirt as her muscle mass began to increase, bulking up to the point where she was just under the point where she would have looked like a female body builder. This also revealed that her mane tapered down, nearly reaching the space between her breasts and reaching half way down her back. Short brown fur covered her entire body by this point. her changes still weren't over though.
Kicking off her shoes she found herself standing on her toes as her feet became almost disproportionately large paws. As her legs changed shape she was forced to remove her pants.
On her chest three more pairs of breasts formed, giving her a total of eight small, perky breasts. In that much it seemed that the liquid served to enhance breasts.
The final changes were slight, the hair on the backs of her arms and legs lengthened a bit to that she had longer tufts of fur at her elbows and ankles. With that the changes were done and Katie turned to Tiff, black and animalistic eyes shining in the dim light in the room
She took a deep breath and...