Mary lifted the vial labelled "Jackass", and inspected it. The liquid could have been mistaken for water if one wasn't careful. She popped the cap off to smell it. Her nose was assaulted with the scents of jenny's in heat, and stale cum. Her pussy grew wet, and ached with need. Mary took the vial upstairs to her bedroom. She made sure the blinds were closed before she stripped off her clothes.
"Here goes nothing." she said, downing the vial in one gulp. She put the cap back on the top of the vial and then set it on her bed, and waited for the changes to begin. The vial instantly refilled, to Mary's surprise. And as it refilled, Mary's body was suddenly very hot. Like someone supercharged her body with electricity, and every nerve was overacting. Her nipples stood erect, and her pussy and clit were swollen.
Mary ran from her bedroom to the bathroom, where she could watch her transformation.
"Oh my god!"