"Wait!" Jeri called before Tom started climaxing. "Can I take a break? I'm not fully nymph yet. Tom pulled out reverting to a human form, Jeri sat up stretched felt herself and then dove for the spell book. "Vos adepto peius!" Jeri screamed flipping to a page in the spell book and reciting it. As soon as she had said that Tom started to shrink in size, "A few inches wont stop me from screwing you!" Tom yelled. "But when I subtract sixteen inches in total it will stop you." Jeri responded and immediately Tom doubled over. His cock once strong and erect became wilting and inverted on itself. "What have you done?" Tom said lunging at Jeri who was laughing. "I've switched our roles, except this will be worse for you than it was for me. Than Jeri felt a pushing sensation in her groin, like her vagina had to shit and soon Jerry was back. Jerry grew taller and stronger, while Tom grasping for his dick shrank to a hight of 5"7 and started to have problems seeing her groin. "You'll pay for this!" Thomasina cried out lunging for Jerry. Thomasina stumbled from the added weight on her chest and fell flat yelping and moaning. "You're very sensitive aren't you?" Jerry asked the girl on the floor who had started to cry in shock. "Maybe you should thing twice before-" Jerry cut himself short when all of the sudden he had a vissious craving for sex. His dick felt strong and hard and looking at Thomasina on the floor made him smile. "Poor thing you look so scared!" Jerry said. "Let me help."