Ginny woke up to find herself in a stall. That wasn’t right. She’d been at some party last night, had beaten her coworkers in three consecutive games of vodka pong, but then it all got blurry. Well, it got blurry a good deal earlier than that, but she could at least remember those blurs. Kind of.
“W-whats’s going on?” With a start, she realized she was naked, and she tried to cover herself with her hands. Hay crunched under her feet as she pounded on the door, finding it wouldn’t budge. “Hello? Is anyone there?”
She frowned, listening to her cries echo across... wherever she was. The woman sighed, scratching the back of her neck. Ten years out of college, and now she’s kidnapped and probably going to be sold to some sex trade. Well, they wouldn’t take her without a fight. She’d wait for them, gather her strength, and then maybe try to take one or two of them with her. After all, she was Asian, that had to count for something, right?
After a few moments of silence, she realized that nobody was coming. Dejected, she sat back down on the hay, only for a lance of pain to blossom from her rear. Ginny yelped as she jumped to her feet, turning to pat at the hay. It felt like she’d sat on something, like the end of a handle—perhaps something she could use. A frantic search revealed nothing, and she stood, wondering what just happened.
She turned to look and see what the damage was, but found herself blinking as all rational thought was swept from her mind by a wave of fear and confusion. Her back, her butt—those were the same as ever. But what was between them... that was an entirely new surprise. It looked like her spine had extended to form a short nub of a tail, covered with grey hair.
Ginny raised a shaky hand to her rear, brushing over her the coarse hair on the bump experimentally. She groaned as she realized she could feel it; it was a part of her. The woman creased her brow in thought, trying to control it. She started as she found the muscle needed to twitch it, and then she whimpered as it started to grow.
Her spine clicked quietly as her tail extended from her body, new joints forming and rubbing against one another as her tail wagged, then started to swish once it gained sufficient length. She tried to get it to stop, but had little success, only regaining control when it seemed content with its current size. The hair at its tip was a midnight black to match her own locks, the rest of it in the same gray it had begun with.
More importantly, it was hers, a foreign appendage which now brushed against the back of her thighs. It looked familiar, too. Like she’d seen it somewhere, but she couldn’t quite place it. She tapped a finger against her lips as she struggled to recall what sort of creature had a tail like that—for it was clear that she was somehow changing form. Its familiarity meant that she probably wasn’t changing into something extraterrestrial, but what was it?
She scratched at her lips, and with a start realized she couldn’t feel her nails as well. She probed her lip as the skin there thickened, and Ginny grunted as her jaw pushed away from her face, forcing her eyes away from each other. She crossed her eyes to see her nose expand to cover more of her face, tanned skin going grey as more hairs poked out from her muzzle. She took in a deep breath, snorting and nickering, mostly to see how it felt. As her lips flapped against her teeth, she realized they had thickened too, becoming broad and blocky.
Ginny looked around the room, trying to get used to her new eyesight. “Okay, this is AWWWd.” The woman covered her mouth with her hands as she brayed unexpectedly. Wait... Braying, a muzzle, and a tail like that? She was becoming a donkey! Someone had a sick sense of humor. ‘Ginny the Jenny’—she could almost see someone laughing over the pun. She snorted with derision, then turned to the door. She had to break out of here. Maybe the changes would stop, maybe not, but anything was better than being corralled like this.
She shifted her weight and kicked the door. A dull thud greeted her efforts, but she didn’t stop trying. Thud after thud after clop rained down upon—clop? Ginny paused, leaning against the wall as she inspected her foot. She already knew what she would see—the bottom of her foot had become dark and callused, enamel covering the flat of her sole like a shoe.
She clutched her foot tightly in her hands as she watched her toes slide back into her body, each digit going numb as it melded with her metatarsals. The muscles in her foot deteriorated, giving way to bone as her arches cracked, pushing downward. Her stance wobbled as she realized the same was happening to her other foot, the changes forcing her to the balls of her feet.
“Oh Gawwd, this is whn—heee—rd.” She choked out, shaking her head as she spoke. It was bad enough that she was becoming a donkey, couldn’t she at least speak without being reminded of it?
The top of her foot went numb next, and she could only watch as the rapidly hardening enamel covered the upper parts of her new hooves. She put a hand against the wall cautiously, then tried to balance on her new hooves. Unsurprisingly, it didn’t work, and she fell forward onto her hands.
Her back popped loudly, and she brayed loudly as it violently wrenched her to a four-legged posture. Well, a two-legged and two-armed post— Her shoulders snapped as they reshaped, and her wrists lost a good deal of her motion, forcing her to put weight on her splayed fingers. Nevermind, it was indeed a four-legged posture.
Ginny’s thumbs sank back into her palms, which broadened out to match her forearms. The webbing between her fingers turned dark, and spread down her hands, encasing them in the hard enamel of an ungulate’s hoof. Fur soon covered her forelegs, and the itching on her rear legs was proof of her new coat there, too.
The changes swept across her chest next, and Ginny watched her torso barrel out around her breasts, which started to slide down her chest. It was an entirely unpleasant sensation, and she hated to see her one of her quiet prides change so. She scowled, scuffing her right forehoof against the ground with exasperation as they spread fur down the length of her form, finally settling by her rear. She could feel her nipples lengthen into teats, and she opened her mouth to complain.
“Oh, c-hawww-me awwwww-n! Wh-eee-aww hee-haww!” Her speech degenerated into braying as her neck both thickened lengthened, drawing her vocal cords taut as her head rose a little above her torso. She continued to bray senselessly as her hair retracted into her scalp, leaving her with a rough, long mane down the back of her neck. She shook her head and neck, feeling it flip from side to side.
She’d never really liked that hairstyle, but at least it meant the changes were done. The donkey settled on her hooves as she contemplated breaking the door down. Then, her ears yanked back as though someone was pulling on them. Ginny snorted loudly and started to kick her back hooves in the air, braying as she lashed out blindly against her unseen assailant. Her hooves met only air or the walls of the stall, and her ears lengthened until they were the size of her head, her pinnae the most prominent feature, larger and wider to collect as much sound as possible. Then, they were pulled to the top of her head, and she brayed even louder with discomfort, too caught up in the sensation to notice their utility.
The new jenny voiced her complaints to the world, kicking the unyielding wood of the stall as she tried to rant about how unfair it was that this happened to her.

Outside the barn, a humanoid demon shrugged his shoulders. “In my defense, she said she’d be an ass if she ever blacked out from partying.” He said to no-one in particular, giving the air an attempt at a roguish smile.