Both Mary and Jess finish their halves of the cow vial and sit down on the bed to see what happens. For a couple of minutes the girls sit and look at each other.
Then, a deep grumble in the bottom of their stomachs brings the girls' gazes down to witness their first change. Their clothes cover a small round lump. It looks as if a balloon was inflating under and between their shirts and pants. The mass of flesh swells bigger, filling up the girls' clothing quickly. Moans escape their lips as the mass of flesh becomes a sensitive udder.
Jess lifts up her shirt in stark amazement, her eyes wide, as she takes in the mass of pink udder growing on her lower belly. She can't believe that she is really transforming.
Mary giggles and smiles at the familiar sensation of the transformation and the return of an udder. Three pairs of teats plunk out of the udder and lengthen to a good four inches long and an inch wide.
Both udder swell with milk. Jess rubs her taut udder and moans at the sensations. As the udder finishes, Jess feels her ears migrate to the top of her head and flatten out somewhat. Also, an odd feeling of pulling brings Jess up and off the bed as a ropey tail flops down her pant leg. She reaches around and pulls it out, marveling at the wonderful feeling of having a tail.
The two girls, having near the same transformations slowing become cowgirls. Mary smile warmly at Jess and Jess returns a smile, showing she isn't too scared and somewhat intrigued by what is happening to them.