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It was a Wednesday night, so Krysta was in the gym. It wasn’t the busiest time, but that wasn’t her reason for going at that time, it just happened to fit in her schedule. Her corporate job ate up most of her time during the week and evenings were the only time she could spare. The young woman was dressed in her normal gym attire of light gray spandex shorts and matching top as she stretched out on the mat in front of the mirror. Her body was lean but the tone of her legs was noticeable to anyone who happened to look.

She was a runner, and was obsessed with improving her speed and endurance. It wasn’t about winning races, even though she often ran in them, it was about the feeling of speed while she ran. Krysta wanted to go faster, farther, and to push herself forward. Most nights she could be found running on the trails at her local park, but on Wednesday and Sunday nights she hit the gym. All stretched out she made her way to the spin cycles. Krysta climbed up onto one and was soon pumping her legs bringing the machine up to speed.

“Everyday is leg day.” She whispered to herself and smiled.

After warming up on the spin cycles, Krysta moved on to the leg press machine. After setting the weight she started to do her reps, oblivious to the fact the few other patrons had filtered out of the room. Krysta was working up a sweat but that didn’t matter, all that mattered was building up her legs and endurance. There was a half marathon coming up in a few months and Krysta was determined to shave some minutes off her previous time.

After taking a small break for some water, Krysta was checking her phone. Her stomach let out a growl. She was feeling a bit hungry, even though she hadn’t missed any meals that day.

Ugg, Krysta placed a hand over her abdomen, it’s going to be one of those nights and I’m just getting started.

“Oh my, I could hear that tummy of yours across the room!” A woman's voice called out from behind her.

Krysta looked up and turned around to see a beautiful blond haired woman. She was smiling and was dressed in bright red lycra leggings and matching T-top. Although the woman was dressed for the gym, her hair seemed out of place. It wasn't tied or pushed back in anyway, and the long bouncy ringlets would look more at home at a club than the gym. She was slipping a gray hoodie on, as apparently already she was finished with her workout.

“Heh, yeah, I’m working up an appetite tonight.” Krysta joked back, “I’m sure I can last until I get home though.”

“In the meantime,” the woman reached into the pocket of her hoodie and pulled out something. “How about this as a little pick me up?”

She held out what seemed to be a bright blue-purple hard candy in a clear plastic wrapper.

“Oh, ah…” Krysta hesitated.

Perhaps it was the whole don’t take candy from strangers line that was drilled into her childhood mind. Or maybe it was something about the woman’s smile that made her hesitate. But Krysta was feeling hungry, and seeing the piece of candy in the woman’s hand only made it more evident. She was an adult now, and Krysta doubted the woman was going to invite her back to her van for more candy.

“You’re not one of those people who sees candy as the devil, are you?” The woman smirked slightly as she spoke.

“Heh, no.” Krysta shook her head, “I watch what I eat, of course.”

“Of course, and it shows.” She smiled approvingly at Krysta.

The flattery was working as much as the hunger, and truth be told Krysta had a weak spot for blue candies and drinks, a hold over from her childhood.

“Thank you.” She smiled. “Anyway, I’m sure I’ll burn that off on the walk home, really.” Krysta reached out with her hand for the candy.

“Of course you will.” The woman handed the candy to Krysta. “You have a good night, dear.” she smiled broadly as she started to walk away. “Happy hunting.”

“Ah, thanks, you too.” She was confused slightly by the woman’s choice of words at the end, but shrugged it off.

Krysta looked down at the blue-purple candy in her hands. She turned the candy over several times in her fingers. There was no label or markings at all on the wrapper. With a little shrug Krysta twisted the wrapper open and popped it into her mouth.

Mmm, raspberry… She couldn’t help smiling as she sucked and licked the candy inside her mouth Damn that’s good, must be some kind of fancy gourmet candy.

Krysta tossed the wrapper into a trash can as she enjoyed the sweet taste. After rolling the delicious candy around in her mouth for a while, she crunched what was left between her teeth. Krysta swallowed and chased it with some water from her bottle.

That was so good! She smiled. Well, time to move onto the leg extensions.

Just as Krysta took a few steps towards the next machine something suddenly felt off. Her heart started beating hard and fast in her chest. Then she felt like her body was suddenly dunked into ice water. Krysta dropped her water bottle to the floor as the shock hit her body. The sudden chill was quickly replaced with a warmth radiating out from her core. Just as she was trying to recover her balance, Krysta suddenly felt something warm and sticky inside her shorts.

“Oh god! What the hell?” She moaned.

Thankful the room was devoid of any other patrons, Krysta pulled the front of her waistband to see what was going on. Her mouth opened in shock, too surprised to even let out a scream. Blue-purple viscus slime was flowing out of her vagina. It wasn’t soaking through her gym clothes but seemed to be spreading rapidly across her skin.

Panicking, Krysta tried to run for the locker room, hoping she could wash this away in the shower. It was then another wave shot through her body, making her stumble to the ground. This time it was like every nerve in her body fired simultaneously, but not in pain. Krysta was left moaning on the floor as she tried to get back up onto her feet.

She now felt the same stickiness on her chest. Pulling back her top showed the same blue slime now oozing out of her nipples. Krysta could feel the slime clinging to her body and rapidly spreading. She dragged herself back up to her feet, pulling herself up on a nearby weight rack. As scared as Krysta felt there was a cloying warmth and tingle as her body was being encased in the blue substance.

It was getting harder to move her body, as if it was fighting and pushing back against Krysta. She stumbled forward another few steps before her body just stopped obeying her. It wasn’t that Krysta was completely paralyzed, she could still feel every inch of her body as the creeping blue substance covered more of her skin. This was something different, and it was scaring her.

“Fuck! Move damn it!” she shouted loud enough for it to echo in the large room. “Help! Somebody Help me!”

There was no one to hear her panicked cries. A new sensation washed over Krysta’s body and she felt something strange along her abdomen. Her bare midriff was now completely covered in the blue shiny substance. Right above the young woman's hips four growths started to bulge out. Krysta could feel them growing out from her body. The indistinct bumps elongated and grew joints. They looked almost insect-like. One pair of appendages angled down towards the floor, while the other seemed to remain at her side. The tips began to take on sharp wicked points and the material darkened to an almost black color as it hardened.

Krysta stared down as she watched the new appendages flex. They felt as real and a part of her as any other part of her body did. Krysta felt her chest getting tight and pushing up and out against her top. Unbidden by her, one of the now scythe-like arms reached up under her top and slashed it away. It sliced through the lycra top like a hot knife through butter. Krysta let out a gasp of both surprise and release. She didn’t have time to contemplate it further before her legs started to change.

Krysta could feel her shorts stretching as her hips and thighs grew thicker and stronger. Apparently her lower set of ‘arms’ couldn’t reach the material. It hardly mattered as the lycra soon started to tear. Already weakened when another growth started to push its way out from the base of Krysta’s spine, quickly becoming a tail. The ruined shorts slipped down her blue legs.

Stopping at her neck, Krysta’s entire body was now covered in the strange blue-purple material. She looked at her reflection in the mirrors that lined one of the walls and had the realization it was the same color as the candy the stranger had given her. Krysta was aware of every square inch of her body, as all her nerves were firing off sending a bevy of mixed signals into her scared brain. Under the new blue exterior Krysta’s body seemed to shift, almost like it was semi-liquid and flowing into a new shape. Her lean runner's body seemed to gain more muscle tone.

Krysta felt her legs stretch, making her taller in the process. Her toes melted together and formed into a hard point. Krysta’s foot and legs shifted and adjusted so that she was standing on the hard point. It easily punctured through the sole of her sneakers and dug into the vinyl floor below. Her tail whipped behind her. It grew longer and articulated, resembling a long spiked chain of exposed vertebrae. While at the tip a wicked stinger formed.

Almost like taffy being pulled, Krysta felt her body being stretched. She felt her upper body being pulled and twisted away from her enlarged hips. It quickly became apparent that one pair of her new appendages were meant to be front legs. They shifted into position and the spike tipped feet dug into the floor when they came in contact. The new front legs took a few steps forward as her lower back finished stretching and filling out. Along Krysta’s now extended spine several large intimidating spikes sprouted up.

Even though she now resembled some kind of blue demonic centaur in the mirror, Krysta’s changes were not yet complete. In between her front legs she felt things churning. Something new pushed through, suddenly she was sporting a pair of long spider-like fangs between her front legs. As Krysta stared in the mirror, something started to stare back. A cluster of four eyes appeared above the fangs. See had to close her eyes as the visuals from the eye cluster streamed into her brain and confused her. Krysta could ‘see’ through them, but it wasn’t the same as the eyes in her head. The alien sensations took her a moment to sort out.

Her arms were now larger and stronger looking than they had been when she arrived in the gym with her fingers now ending in sizable black claws. Her hands went to her increased chest and started to massage the blue orbs. Krysta had to bite her lip as her fingers pinched and teased her nipples. This seemed to cause a change in the sensitive nubs. Her fingers seemed to tease long whip-like growths from her nipples. Krysta quickly realized these were another sense organ as she became more aware of the lingering scent of pheromone laced sweat in the gym.

Unlike the confusion and near headache the eye cluster had caused, these scents excited Krysta, even in her horrified state. She was soon panting for air, trying to will the fog of lust out of her mind. However, Krysta suddenly felt a rush of heat in her pussy. It felt more intense than any sex she had ever had. She could feel her pussy growing, stretching away from her body in a thick column of flesh. She was moaning now, and would be biting her hand, if she still had control of her arms. A quartet of spikes formed out of her labia and flexed, like a claw ready to grab. As the feeling of ecstasy grew to an incomprehensible level her distended pussy opened wide and a huge equine shaft shaft forced its way out.

“Oh god!” She nearly screamed as her body reared up.

Crying out loudly the head of her cock flared out and a dark almost purple sticky load shot out onto the gym floor. Krysta was left in a daze from the sensation, but she wasn’t allowed enough time to fully recover. Her body started to move, kicking off the remnants of her shorts as it did so.

“What? What are you doing?” she shook her head, trying to clear it, “No stop!” Krysta shouted as her body made its way to the door that opened into the lobby.

Her arms opened the doors and her body leaned her upper torso down to get her through the door, since she now stood over eight feet tall. The desk was unmanned at the moment, which she was thankful for. Krysta’s body stood for a moment in the lobby before heading to the front door against Krysta’s protests. Once her body was through the glass doors, Krysta reared up again and then started to run down the street.

Krysta was soon caught up in a new, yet somehow familiar sensation. Her four feet carried her faster down the street than she could have ever dreamed. Her pointed feet dug into the asphalt for grip as they propelled her forward. She could feel every muscle in her body working in sync as she ran and it felt amazing. She couldn’t help smiling as her body took her for a ride. Caught up in a new kind of runner’s high, it took Krysta a bit to realize her destination.

“The park?” She said as her body leapt over the stone wall of the park in a single bound. “What are we doing here?”

Krysta slowed to a walk and then paused, standing perfectly still. Her cluster of eyes seemed to be better suited to seeing in the low light of the scattered lamps along the park’s winding paths. Her breast antenna waved slowly through the air, filtering through the various scents on the wind. Krysta felt her body coil like a spring when it detected the scent of human pheromones. Her lower eyes caught the movement of someone off in the distance and she was off at a trot.

Though far from her top speed, Krysta was moving quicker than a jog and soon she could see a woman up ahead going for an evening run. She felt a rush of hormones in her body and Krysta realized she was hunting this young woman. She couldn’t stop her body from moving on its own, but she could still warn her.

“Look out! Run!” Krysta cried out at the top of her lungs.

The woman turned her head to look over her shoulder. When she saw the monstrous form following her down the path she froze in her path.

“No!” Krysta yelled so loud it hurt her throat. “Don’t just stand there! Run! I can’t stop it! Run!”

That seemed to snap the jogger out of it and she screamed before taking off at full speed down the path. Krysta’s body immediately took off after her. As they ran along the path, all she could do was urge the woman to get away, but there was nothing she could do. The poor jogger was no match for the four-legged creature chasing after her. The woman was too out of breath to scream as she was overtaken by Krysta. She lifted the woman up off her feet easily with her powerful arms.

“I’m sorry! I can’t control it!” Krysta cried out, pleading with her eyes for understanding.

Her tail lashed out and dug its stinger into the jogger. The poor woman’s eyes went wide, too shocked to scream, then something else came over her. Her body stopped struggling and she started to moan loudly. Krysta’s antennae were flooded by the pheromones coming off the jogger. Krysta’s lower arms went to work, deftly slicing every stitch of clothing off the woman.

All her victim could do was moan and quiver as if she was already in the throws of an orgasm. Krysta was feeling the lust build in her as her body tossed the woman face down, ass up on the jogging path. Her equine cock was already out and aching with need as she mounted the woman.

The jogger’s cry echoed in Krysta’s ears as she forced herself in. Though she had no control over her body, Krysta soon found she didn’t care. Her captured partner felt so hot and wet as she stretched tightly around the monster cock. The talons surrounding her shaft gripped the tight ass of the woman as she plunged deep. The jogger climaxed, but Krysta wasn’t done. She reveled in the feeling of pure lust as she continued to hammer the sopping pussy. Her prey’s eyes rolled back in her head as she hit even harder, her mouth open wide in a silent scream.

Krysta threw back her head and let out a cry of her own as her cum pumped into the woman and leaked out around her shaft. As she was panting for air her body rested for a moment before pulling out. The candy-like purple cum flowed out of the now vacant pussy. Krysta was in a daze as her body picked up the woman and carried her just off the trail and deposited her behind a bush. Even if the woman wasn’t still under the immobilizing effect of her attacker’s venom, she was in no state to go anywhere.

As the lust faded enough to give Krysta some sense of clarity, she realized her body was already on the hunt again.

“Oh god…wasn’t that enough?” She asked her body as it focused on a new scent in the air.

She cut through some brush and saw a young man running down another trail. He was wearing headphones and must not have heard the cries of passion. At first Krysta was going to try and warn the jogger but as she watched his lithe body jogging down the path she felt less and less of a need to.

Oh god…what am I even thinking?” she thought as her body slipped out from its hiding place. Her body trotted behind the man, keeping pace at first.

Even while caught up in his own world with the music blasting in his headphones, the young man must have felt all the eyes that were locked on his butt. He looked over his shoulder and saw the dark blue creature following behind him illuminated by the lamps on the trail. He let out a surprised shout and immediately started to run. He was much faster than her last prey, but that only made the chase more exhilarating.

Krysta didn’t know if it was her own mind becoming deviant or it was just the effect of her transformed body influencing her. Frankly she didn’t care, Krysta wanted to chase down and catch this man. She was almost laughing as she closed the distance with every step the runner made. She leapt up and tackled him underneath her body. As they slammed down on the trail, her fangs sunk into his back. Almost instantly, he stopped trashing, going completely limp and a calm relaxed expression spread across his face.

With unearthly grace, Krysta got back up on her spiked feet and picked the softly breathing man up. She tossed his body over her shoulders like a sack of potatoes and trotted back to where she had left her other conquest. The woman was still passed out with a small pool of purple cum on the ground under her pussy.

Krysta pinned the man up against the tree. She was smiling as she eyed his body, already looking forward to what would happen next. Just as the venom from her fangs was starting to lose its hold on him and was starting to struggle, Krysta’s tail delivered a dose of her powerful aphrodisiac into his shoulder. He moaned loudly and the tent in his running shorts was almost immediate. As Krysta’s sharp arm blades shredded off his clothes he actually came, spraying her with his seed, not that she really minded. She put him into position and mounted up for the second time that night.

He moaned loudly as she claimed his tight hole for her own. The thought Krysta was probably popping his anal cherry felt delightful. Tight as he was, his body had no choice but to give in to her cock. He hugged her shaft tightly, but offered no resistance to Krysta’s thrusts. Before long she was pushing in with ease. Her prey was moaning like a bitch as he shot off another load onto the ground underneath him. Krysta felt no restraint this time as her body pounded his cute little butt. She was moaning almost as wantonly at this point. It felt so good, better than any sex she had ever had before. Krysta would have laughed if she could have spared the breath while she had her way with him.

With one final powerful thrust she cried out and emptied a load into his quivering body. Predictably, this was too much for the runner and he had passed out from the pleasure. His ass now full of her hot cum, leaking out around the shaft that had stretched him wide. Krysta was caught between panting for breath and laughing as she slowly pulled out. She heard a soft moan and some rustling as the woman stirred. Krysta turned and saw the young woman slowly crawling on her hands and feet towards her. She reached up and touched Krysta’s cock, still dripping its candy-like purple cum.

“More…” She whispered. “Please…I need more…” She reached out to start licking the equine shaft. “So good…” She moaned, reaching down with one hand to finger herself.

Even though Krysta had just climaxed, the woman’s hot tongue cleaning her equine cock kept it from going down. She looked down and giggled as her now willing prey worshiped her cock.

“Well, if you insist…but only until I can find my next target.”

***

Krysta woke the next morning in the park with a pile of her prey. It had been a good night’s hunting. She had captured two more hapless late-night joggers, another woman and man, not that she cared about gender in the least anymore. The last one had given her a particularly good chase, he almost made it out of the park. However, she might just have been growing a little slower by that point in the night. She still had plenty of energy to fuck him into a stupor after catching him.

After recovering from her sting her prey were more than willing to show their appreciation. And when they weren’t pleasuring her own blue body, they were fucking each other like rabbits. It was a miracle they weren’t caught by authorities with the noise the little orgy made through the night. Not that Krysta was worried, cops would have made for some interesting prey.

Her body had returned to normal, at least mostly, by the time she woke up. Krysta was back on two legs and her skin had returned to its original color, rather to her disappointment. She was far from the same woman though, after her experience. Krysta had found a newfound speed and endurance, better than anything she could have achieved on her own. There was no doubt in her mind she would win the upcoming half marathon, but that was almost an afterthought to her now.

Krysta’s professional career wasn't hurt in the least. In fact, it arguably improved. With new found confidence, she had no problem going in and demanding a raise she knew she deserved and received it. A week later Krysta was offered a promotion. She was never a shy woman, but her aura seemed to just slightly intimidate those around her, and Krysta used that to her advantage. Climbing the corporate ladder, however, was just the cherry on top of her new life.

Krysta now spent nearly every night in the park, not running for exercise but for the hunt. Her prey always showed up, as compelled as she was to be there. Whatever they had been before she caught them, they were hers now. They had as much fun trying to escape her as Krysta had chasing them down. They certainly never complained once she caught them and fucked their brains out. Krysta had to settle for a strap on dildo for now, but it didn’t diminish the excitement that much. More than half the fun was in the chase, after all.

It seemed her venom had left her prey overly sensitized when it came to sex. Their bodies would respond to the slightest touch, growing wet or hard at the drop of the hat and making them hornier than a sex deprived teenager. They were sent into a fit of moaning at the slightest caress now, not that Krysta was ever gentle with her prey. As easily as they came, they had the endurance to last the night with Krysta and each other.

Krysta still visited the gym once or twice a week under the guise of working out, but she was really hoping to just run into that woman again to see if she had any more of that delicious candy. After all, as much fun as her new friends were, Krysta could do with some fresh prey.

_________________________________________

Characters and setting are property of Genyun

FA: https://www.furaffinity.net/user/genyun/

Twitter: @GenuineGenyun

Written by Syntaxerror37

FA: https://www.furaffinity.net/user/sevencrown37

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Discord: therealse37

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