After school, Jon and Karyn went over to Karyn's house. Jon and Karyn went to each other's houses so often, being neighbors, that they didn't even bother telling their parents, who wouldn't worry. Karyn took Jon's hand and pulled him up to her room, shutting the door behind them. Karyn almost never did this, causing Jon to wonder what was up. Then Karyn pulled off her shirt and unhooked her bra, allowing her breasts to bounce free from their cloth captivity. As she began removing her skirt, she paused and said to Jon, "Aren't you interested today?"
"Interested in what?" asked Jon.
"In sex, silly," answered Karyn. "It's my time of the month, remember? I'm in heat, and you know how much I want sex when I'm ovulating. You've always been more than interested in satisfying my urges before. Are you just off your game today?"
"Probably," said Jon. "I have been pretty distracted by the stone lately. But if my little vixen needs me, then I'm there for her." Jon began to undress as Karyn lay down in her bed, posing sexily and looking at Jon with undisguised lust in her eyes. Karyn spread her legs and Jon mounted her, thrusting his manhood into her awaiting pussy. Karyn was an energetic lover, bucking her hips in time with his thrusts, begging him for more. Karyn and Jon had a mutual orgasm and collapsed in a heap of naked flesh.
Karyn cuddled close to her lover, kissing him passionately and slowly. "Thanks for giving me what I need," she said. "I know that swinging back and forth between the highs and lows of my sex drive is a hassle for you and I'm grateful that you are willing to accomodate me."
Jon kissed Karyn in return. "You're welcome," Jon said. "I'm always willing to help out."
"Of course you are," said Karyn, stroking Jon's cock. "And if you get a little pussy in the bargain, who are you to complain." Jon blushed and kissed her again. Getting up, he put on his clothing, kissed Karyn one last time and went home.
Once there he did some research on catgirls to better understand how girls thought and acted in this new reality. Catgirls, foxgirls and the like all went a period of heat when they ovulated, similar to animals, but it happened according to the human monthly cycle instead of only happening once or a few times a year. Women did not become nymphomaniacs or experience uncontrollable sexual urges, but did have a fairly large increase in their sex drives, desiring more physical and sexual intimacy. Jon also learned that the animal girls were based on was determined by the mother, rather than the father. Thus, if Jon, who was from a catgirl family, and Karyn, who was from a foxgirl family, had children, they would be all foxgirls rather than catgirls or a mix of the two. Jon closed the book, wondering how else the wish had changed not only his own life, but also the lives of others. Did Zoe have a boyfriend and did they have sex like he and Karyn did? Did his parents have sex more often? Jon would have to find out.
