She noticed a halter that was hung high. Was it some kind of challenge? It was even called "Champion". She smirks and starts climbing there, using a stool, then grabbing a nail of another halter, then another that is missing. Finally, she reached the halter that was 'smirking' to her. It looks expensive, but also.. kinky. It was made for a human head, not a horse.
She knew she already allowed herself too much, she shouldn't grab it. Not to mention about trying it! But curiosity wins, as she put it on. Immediately she felt it wrapping around her head. She yelps and tries to take it off, but it looks like there were no lathes, or rather they were just decoration.
Jessica loses her balance and falls to the ground. Gladly she managed to land without breaking anything, after all, she was falling many times training the gymnastics. The halter just didn't allow anyone to be taken off!
Disoriented Alex was already looking for her, lead by the noise he enters the forbidden room to see Jessica desperately trying to take off the halter. He saw that halter once... He took it off one of the horses that were here when he started working. A stallion that was sold pretty quickly and was just weird. "Alex? H-help me!" Jessica cries seeing her friend standing above.
He was going to help her taking it off, when he noticed her hair lightening, also other things weren't right. Her hair was black but was turning blonde. She was too busy trying to find a way to take it off but noticed she start having trouble with her fingers. They got stiff!
She stops fighting with the halter, she had to check out her fingers first. When she put them in front of her both could notice they were clearly changing into something inhuman! She cried out staring at her shrinking fingers, the nail of middle finger growing. Her clothes started to feel tight.
Alex could just watch as his friend was changing... She didn't seem to be in pain, but she felt horror seeing and feeling as her body was changing. She tried to stand up and run away, only falling forward just behind the doors. She couldn't stand up anymore, Alex decided finally to help her, they found out her body wasn't mean to stand on two legs anymore. Her hip grew and her legs changed dramatically.
Tight clothes started to cause some pain. "My clothes... Take them off... Please!" she pleads, she wasn't keen to show herself naked, but her body was gaining mass and growing. There was no place nor time to take care about modesty right now. Her voice sounded terrible... almost not like of a human.
Alex takes off her clothes, she wasn't wearing anything tight, mostly some elastic sports clothes, but stretched caused some pain. He hesitated with her underwear but slid it down. Jessica feeling great relief fell to the ground. Her face... head... She was growing a muzzle, horse muzzle, that soon will fit her hooves, rump, and.. tail. She was pleading for help, which soon changed into neighs.
The almost complete horse was kicking, not used to new limbs, or even without knowing what's happening. The halter seems to adapt to the changes, soon, there was a panicked and confused horse lying on the ground of the stable.
Trying to calm the horse down, Alex kneels next to its head and strokes its neck "Jessica? Is that still you there?" he asks, then the horse whinnies and nods slowly. He could see the terror in her eyes. "Okay... rest for a while, I'll look around." says standing up and heading to the forbidden room. Boss said to never enter there. He found two missing halters there. It seems one was the one Jessica put on, the other boss took, leaving it open. He had to be in hurry to make that mistake