The doctor injected the serum, Jen felt the effects immediately. Her breasts grew to GG-cup and she grew a second pair the same size. A large udder formed just below her belly. It also filled with milk. She was covered with white fur, and black spots appeared in random places except on her head, breasts, and udder. Her hair turned white and grew longer. A pair of horns grew out of the top of her head. The bones and muscles in her fingers realligned so that her fingers could only move in pairs, as if she had three fingers on each hand. A cow tail grew from the end of her spine. Then it got weird. Her tongue got rounder and fleshy. It grew so long she couldn't hold the hole thing in her mouth. She opened her mouth and a long dick fell out. It was about 10 inches long. Her transformation was over, so they dragged her into the next room.