As Mary drove she felt strange and a little bloated, but nothing extraordinary. Her period was due to start in a few days so this wasn't wholly unexpected. The closer she got to the store however, the more intense she started to feel.
She reaches her hand down and rubs her gut slightly. It rumbled in response and she felt her stomach lurch further.
"Ugghhh," She said aloud, fighting back a wave of nausea. "Maybe chugging some dubious liquid wasn't the smartest idea Mare..."
She quickly made it to the store and pulled into the parking lot, choosing a space near the back. Turning the vehicle off, she unbuckled and lifted her tank top slightly.
Her belly looked pretty normal to her, and the rumbling was starting to die down. Mary figured she would be able to finish her shopping quickly and get home to rest before her gut started doing somersaults again.
She gets out of the car and heads into the store, grabbing a basket by the front doors.
She had intended to pick up baking supplies, but as she scanned the store, her eyes alighted upon the produce section. While she wasn't an unhealthy eater, she usually didn't have much of an eye for fruits and veggies. Now, she suddenly realized just how appealing they were, the bright greens, reds, and yellows of various produce stuck fast in her vision.
She dithered slightly, torn by this sudden attraction to the produce, part of her was still focused on grabbing the supplies that had brought her here in the first place. Mary had just started to turn away when a smell wafted into her nose.
Unbidden, her nostrils flared wide as air sucked through them, her eyes closing as she took in the scents; the earthiness of the carrots, the sweetness of the apples, all of it hit in a way that she had never felt before. She breathed out and reopened her eyes, her nostrils not quite returning to their original, small shapes.
Her previous grocery list forgotten, she strutted over to the produce section, piling anything that looked good into her basket. As she was eying the carrots, Mary felt a strange sensation wash over her.
Her legs and glutes shuddered, and she felt a gurgling within them much she had felt in her stomach.
"Wha...!?" Was all she could say before her legs gave out slightly and she nearly fell atop the pile of carrots in front her. She flung her arm out just in time, catching edge of the display stand.
A tingling and pulsating feeling was roiling through her rear and thighs, and a feeling of pressure built in them. She bit her lip, eyes closed she bit back a moan. Some of the sensations bounced around near her crotch. More tendrils of invisible energy seemed to lash about her lower half, feeling halfway between a light beating and a sensual massage.
Throughout all this, the feeling of pressure rose and fell continuously in her muscles, and Mary failed to notice the sound of straining fabric as her leggings tightened. Suddenly her rear stung for a moment as though she had been spanked, and she shuddered in a barely contained delight that shocked her. The tendons in the soles of her feet flexed, and her toes pressed tautly against the fabric ends of her shoes, which now felt a size too small. She involuntarily rose up onto her toes as a wave of biochemical delight flooded her mind, air streaming in and out of her widely flared nostrils.
The sensations reached a crescendo, and her pussy twitched, a few thick dribbles of fluid leaking out. Then, just a suddenly as they had begun, the feelings ceased, and Mary opened her eyes, gasping for air as she looked frantically around. Thankfully the produce section was relatively empty, and the music playing over the speakers seemed to have covered any sounds she was making. Still, the older woman behind the bakery counter was giving her a strange look, and Mary felt she needed to get away from prying eyes.
Mary set her basket full of produce down, and rushed off to the women's restroom, trying to ignore the tightness of her leggings.
She burst through the door, shutting and locking it behind her. She leaned back against it, head upturned and eyes closed, doing her best to steady her breathing.
What the fuck had just happened? She thought to herself.
She walked over to the mirror and peered at herself. Her cute face peered back; her hazel eyes were a little frantic, her pale skin flushed, and her light brown hair was mussed up, but otherwise she looked normal.
She was about to turn away when she glanced down to her lower half, and she gasped. She angled herself slightly in the mirror and could see that her leggings suddenly looked about two sizes too small. Her legs, and thighs in particular, pressed out intensely from them.
She turned fully around and saw her ass was noticeably larger, the fabric of the leggings pulled slightly sheer by the increased mass of her cheeks. She panicked a little. To her it was huge!
Mary rubbed a hand along her engorged ass, ignoring the soft tingles of pleasure that this caused, and marveling at just how firm it felt. In all her time working out over the years, she had never gotten her butt looking and feeling this good.
She felt her big rump again to be sure it was real before picking a wedgie that had formed when it had expanded.
How the hell had this happened? She thought. People don't just suddenly swell up like this.
That's when it hit her; the vials! They must be real after all, and she was starting her early changes into a horse!