She didn't just want to have more features like a cow, however. She also wanted to increase milk production to get that udder bigger. "Maybe if I try the cow and female vials together," she thought.
Sipping a bit of the female vial and almost half of the cow vial, Mary began to feel light-headed again. She sat back down on the bed, massaging her new udder as a warm sensation flooded over her body. Underneath her hands, she could feel the udder expand. Each of her four teats grew inches longer as the udder nearly doubled in size.
But that wasn't all. She could feel a strange tingling in her head, as well as her chest. She looked down to see her breasts balloon slightly outward. Their nipples elongated. She was surprised to see more bulges forming on her chest. Two more rows of breasts began forming, growing as large as the originals with matching teats. As she rocked with pleasure on the bed, she could feel milk sloshing inside each of her six breasts and udder. Altogether, they bounced and giggled against each other, feeling a bit cramped and contributing to a rising pressure in each of the seven mounds.
Mary stood up once again, with more difficulty this time. Her back was having some trouble coping with the weight of her sagging and ample milk stores. She noticed for the first time that light hairs had grown over most of her body, with the exception of her palms, breasts and udder. It was a fine white in some areas and grew darker in others. She found the nearest mirror to survey the changes.
Her face had also changed. Two short horns were now growing just above her temples. They curved inward like a cow's. Next to them were her new ears. About five inches long and covered with fur, they flopped down the sides of her head.
She felt something scrape her legs. Turning around, she discovered a long white rope of a tail dangling from her back. It was a good foot and a half long and tipped with a tuft of hair the same color as the hair on top of her head.
Doing a full turn, she was very pleased with her new appearance. Thoughts of finding a new wardrobe and explaining this change to her friends floated through her mind until her attention was brought back to the growing pressure her mammaries were experiencing.