Mary couldn't help but want to be a bit more like a cow. She had to balance out her upper half with her lower, after all. After taking a light swig from the vial, she proceeded to make herself some lunch.
Her hooves clacked on the tile floor. She couldn't find much to eat in her fridge. As she remembered that she originally planned to go shopping after work that day, a pressure began to build in her forehead. The slight headache caused her to fumble a bit while she made her way to the bathroom mirror.
She saw that her ears were growing points and were much farther up her head, though she could tell that wasn't what was causing her pain. She brushed aside her hair and found two small bumps growing in her scalp. Something sharp emerged from each of the nubs. She realized she was growing light gray cow horns. As they slowly emerged from her hair, she watched her ears grow longer and longer, finally folding under their own weight. They flopped down next to her cheeks as her horns finished growing out. They were about four inches long and curved inward, looking rather cute.
More white and black fur had grown between her waist and neck, completely covering her arms as well. Her fingers went numb as they melted together, forming only two thick fingers and a thumb on each hand. Her fingernails grew large and jet black. Her chest was expanding as well. Mary guessed her breasts had grown at least a cup size, standing out proudly. For the final touches, the fur invaded her face. White fur grew from her chin to her forehead, with a single black patch on her left cheek.
Her changes had finished, and Mary posed in the mirror, admiring her new body. Her tail swished playfully around her legs and her breasts looked even more attractive than before. With a three-digit hand she patted her plump udder.
Finally the grumbling in her stomach became too much for her vanity to take. She needed to get food, but that would mean leaving her house. Could she survive on the scraps left in her kitchen? Or perhaps there was another way to get food...?