Rob grabbed the cow vial and had Mary drink it. She transformed the rest of the way into a cow. Her spine shifted so that she would've been on all fours had she been mobile. Her neck grew longer, her face extended. Soon Mary was completely a cow. "What did you do that for?" she asked. Obviously she could still talk. "Now I'm a full cow." Rob shrugged.
"I don't know," he said. Mary used her hooves to push into the top of her udder, producing enjoyable sensations.
"I need milked!" she exclaimed.