The video that Kyle put on was unlike anything Jen had ever seen before. She sat in silence, oblivious to the curse-driven actions of her right-hand, completely absorbed in what she was watching. On the screen was scene after scene of women trotting around fields, wearing nothing but a harness and bit gag. The ponygirls were obviously highly sexed with their pussy juices running freely down their legs and shimmered in the sun. Eventually the ponygirl would get fucked, usually by her Master or Mistress, but sometimes a horse would be brought to the paddock. She had never heard of such a fetish, but it fascinated her, and that fascination grew with every passing orgasm. After an hour Kyle switched off the video and told Jen to go home.
The next day, after school, Jen put up little resistance as she walked over to Kyle's. There was a saddle on the floor but before she had a chance to wonder about its presence Kyle hit play and her attention locked onto the screen. The next time she noticed the saddle she was sitting on it, her panties had soaked through to her jeans and Kyle was telling her to go home.
Each day Kyle pushed Jen a little further. Jen made no complaint when Kyle snapped a collar and leash around her neck. She obediently opened her mouth when he showed her a bit gag. When Kyle dangled a harness in front of her she jumped up, stripped and strapped the harness on. The harness covered absolutely nothing, it simply framed the features of her changing body and the new Jen felt proud to display herself in front of Kyle.
Her body had slowly undergone changes everytime she had had an orgasm. The muscles in her legs had become extremely strong and well defined without losing any of their feminine grace. Her ass had grown round like a rappers girlfriend but there wasn't a single cell of fat, only soft muscle that could milk a cock dry. Her waist was thin, stomach flat with a hint of muscle definition and her back was elegant and yet as strong as her legs. Her breasts had steadily grown to an enormous g-cup that literally defied gravity and would remain that way forever. They had a beautiful teardrop shop with the nipples upturned slightly at the end. The nipples had elongated to over an inch and the aeroles were large, perfectly round and had a slight raised puffiness. Her face had remained unchanged, but her hair had grown half-way down her back and gained a stunning wave effect. Her entire body was deeply tanned, including her breasts, and her nipples had changed from their former bright pink into a more sultry olive-brown colour.
All she thought about, all she dreamt about was becoming a perfect, extremely slutty, ponygirl. Incredibly Kyle never made a pass on Jen throughout the whole weak, even though by Friday she was desperate for him to make a move.