Mary decided on becoming half horse and took chug of the half the vial. She waited a minute, but nothing seemed to happen. Another minute and then she realized, how stupid all this really was. She couldn't believe she fell for this fraud. It must be some strange marketing scheme. Mary had errands to finish though, so she stuck on her miniskirt and tanktop, and headed out the door. The first thing on her list was grocery shopping.
As she pulled into the parking lot she felt strange and a little bloated, but nothing extraordinary. She figured she would finish her to do list quickly and get home to rest. She perused the produce section, she realized how appealing the fruits and vegetables were. She piled anything that looked good in the buggy. Usually, she struggled to eat healthy, but today she actually wanted to.
As she was eying the carrots, Mary felt really uncomfortable. She noticed her skirt felt much tighter. She parked her cart, and went to the women's restroom. She looked in the mirror, to see her skirt was about two sizes too small. She turned around and saw her ass was noticeable larger. She panicked a little. To her it was huge! She felt her big rump to be sure it was real. That's when it hit her. She was gaining mass and becoming a horse. The vials must be real after all!