Canterlot High Monster Girl Mayhem!

Chapter 5: Twilight Slithers Around the Lab

~Back outside Principal Celestia’s office, after the Incident~

Twilight Sparkle sniffed at her hands and the grimy gym clothes that had been loaned to her and her friends. Her first instinct was to head back to Equestria to detail her eye-opening experience here in this dimension. Watching as her friends went their separate ways, the bottle of the transformative solution caught her eye. Being a mare of science, even a failed experiment has some application in learning what not to do. She thought with Sunset’s help, they could truly create something special. However, Sunset Shimmer was busy entertaining this world’s Starlight Glimmer and Trixie so it might have to wait until her next visit. Grabbing the bottle from the trash bin, she quickly stashed it in her bag and swiftly walked around the corner, right into another student!

“Ouch!”

Knocking both of them to the ground, the unsuspected student had her glasses fall off of her face. Twilight shook her head as she picked up the thick black frames, looking through the lens.

“I’m so sorry! I should have looked where I was going! Wait…” Twilight paused, recognizing the look of these glasses. Through the blurred corrective lens, a distorted of her own image, dressed in an updated yet familiar outfit, came into view. “It’s you!”

“Princess…?” the other Twilight asked, holding her hand to her head as her vision was just as distorted at the blob talking to her. Twilight graciously gave her counterpart the frames, making the world clear for her once more. “It is you!”

The two Twilights mirrored each other’s movements, waving at first, then going in for a handshake before landing on a friendly hug. The girls giggled as Princess Twilight adjusted the strap on her shoulder.

“I was wondering what you were up to around here!” Princess Twilight smiled as the other Twilight rubbed her hand behind her head. “Where were you at the science fair?”

“Oh, I had an exhibit. It wasn’t as… creative as your guys! In fact, the judges didn’t even get a chance to see it.” Twilight explained, running her hand on her arm. Princess Twilight couldn’t help feeling responsible with the loaned gym sweatshirt weighing down on her.

“I’m so sorry! I had no idea that the Elements of Harmony would react in such a way with the genetic modifications that Sunset was hypothesizing!” Princess Twilight struggled to explain.

“Well given the fact that the source of Equestrian magic, which I may or may not have altered, allows Sunset and her friends to pony-up then it would stand to believe that the Elements have a connection to an internal connection to animalistic traits and modifying that connection could only lead to disaster!” Twilight continued, pushing up her glasses as she schooled the Princess of Friendship on the subject that she was most familiar with in this dimension.

“Right,” Princess Twilight chuckled nervously before gesturing behind her. “Speaking of which, I should be going.”

“Wait!” Twilight shouted, blocking Princess Twilight’s path down the hall. “Didn’t you hear what I just said?”

“Yeah, it was a disaster. That’s why I have to go back to Equestria before we cause any more damage in this world,” Princess Twilight pushed her aside as Twilight stood her ground in front of her mirrored self.

“No, that’s exactly why you shouldn’t go back to Equestria! At least not right away!” Twilight grabbed the Princess’s shoulders, making sure she understood how serious this situation was. “Think about it, Princess. If you went back to Equestria, you would not only be altering your form back to being a pony, but you would still be affected by the snake genetic make-up which created the incredibly dangerous and seductive anthropomorphic form that was at the fair. You could end up being stuck as a sex-crazed chimera on a rampage through your castle!”

“That… does make sense,” Princess Twilight admitted, trying to imagine what a half-pony, half-snake, half-human would actually look like.

“We can run some tests back at my lab. Then when all of the transformation toxins have left this body, you are free to return to Equestria, Princess.” Twilight smiled, holding out her hand.

“Yeah, okay!” Princess Twilight agreed, taking her mirrored self’s hand in hers.

Flipping the light switch, Princess Twilight was greeted to her other self’s laboratory as Spike the Dog ran up to her happily. Even though he wasn’t her young dragon assistant Spike, it was refreshing to see a familiar face.

“Whoa! Two Twilights!” Spike barked happily, recently being given the gift of speech to talk to his owner and anyone else in confidence.

“That’s right Spike!” Twilight mentioned, leaning down to rub under his doggy chin. Princess Twilight looked around at all the various scientific equipment, almost overwhelmed at the instruments that the other Twilight had at her disposal. “Of course, you’ve met Princess Twilight before!”

“Yeah, she has this weird horsey-like scent to her!” Spike sniffed, circling around her in the middle of the room. Princess Twilight blushed in embarrassment at her pony nature being so easily exposed by the pup’s keen senses. Twilight couldn’t help but giggle as she picked up Spike, holding him in her arms.

“Don’t mind him, you smell fine. I’m sure. I’d offer you a change of clothes but-”

“Oh, don’t worry! I’m fine like this!” Princess Twilight brushed her hands down the sweatshirt. “I don’t want to be a bother.”

“If you say so!” Twilight set Spike back down on the floor as she grabbed a leash from the counter. “I was going to take Spike here on a walk. He’s been cooped up inside while I was at school today.”

“Yeah, gotta stretch my legs!” Spike chirped up, stretching his limbs on two legs rather than like a normal, non-magical dog. “It shouldn’t be too long, Princess!”

“You’re free to watch something on the TV if you’d like. We’ll be back in a bit!” Twilight continued, clipping the leash onto Spike’s collar next to his heart-stamped pendant tag. Spike let out a cheerful bark, indulging in his doggy instincts as the two ran up the stairs to leave the lab. Princess Twilight waved them off as she sat down on the small couch in front of the flat-screen TV.

Turning on the TV, the screen was tuned to the last channel which, not surprisingly for the scientist Twilight, was a nature channel. Not the most exciting content but then again, Princess Twilight did love a good report on pretty much any academic or scientific study.

“Coming up, our spotlight on reptiles continues with an hour of snakes!”

Twilight’s eyes lit up at the sound of the subject before shaking her head during the brief adverts. She knew that it would only be trouble to watch a program like this but who knows what would happen if she started to watch more about a snake’s behavior. And yet, her curiosity pushed for the untold knowledge that the documentary had to teach her.

Listening to her scientific mind, Twilight turned her attention back to the screen, where the program was just starting.

“Almost all snakes are covered in scales and being reptiles, they are cold-blooded which means they need to regulate their body temperature externally. Their snakes serve the purpose of trapping the moisture of their arid climates along with the mobility in their slithering motions.”

A garter snake was seen moving around in a serpentine motion on the screen, seemingly almost hypnotic as Twilight watched on. She scratched at her midriff, remembering the brief sensation of her scaly tail.

“Snakes hunt using their tongues. Their forked tongues allow them to essentially sense or ‘smell’ their surroundings, warning them of impending danger or allowing them to stalk their prey for their next meal.”

A python leaped on-screen before giving a loud, amplified hiss with its tongue. The sound rang in Twilight’s ears as she started to remember that she did end up picking up the solution from the trash bin earlier.

“Snakes also have a unique feature called pit holes that allow them to feel the heat off of their hot-blooded prey. It’s with these traits that make the snake a fearsome predator for small mammals like mice and other rodents.”

Another equally ferocious snake lunged at an unsuspecting rat in the dry plains of their habitat. The rodent squeaked as the snake opened its jaws, ready to feast on its prey. Twilight seemed almost entranced by the behavior, falling into the very trap that she was worried about.

“The mating habits of snakes are also essential to their survival in the arid heat. Most snakes lay eggs after mating, but some species such as the sea snake give live birth to their young.”

A graphic on the program illustrated the reproductive genitalia of both male and female snakes for educational purposes. Twilight seemed especially fascinated with the male side, noticing that a male snake actually possesses two members. Her cheeks warmed up, remembering her intersex anthropomorphic form from the science fair.

“Coming up, we learn more about the formidable predator of the snake family, the python!”

Twilight quickly turned off the TV, chuckling to herself as she could feel her heart beating faster. Her head was filled with all those things in the back of her mind influenced by the snake-like transformation, knowing the dangers that came with remembering such dangerous and explicit thoughts. The bottle of what was left of the solution weighed in her bag as Twilight went over to pick it up. The liquid sloshed before her eyes, her thoughts still focused on the hypnotic movements of the snake’s slithering.

“If only…” Princess Twilight told herself before being interrupted by the other Twilight and Spike’s arrival back from their walk. She quickly hid the bottle behind her back as she turned to face the scientist, only making her pulse go faster in response.

“We’re back! Did you find something to watch?” Twilight asked, unhooking Spike as he immediately scurried over to his dog bed, ready to rest from his brisk exercise. Princess Twilight chuckled nervously at the question, her ears picking up the sound of the solution in the bottle. She could feel her forehead growing warmer with beads of sweat as her fingers gripped the neck of the spray.

“Oh! Well, actually…” Princess Twilight trailed off as the other Twilight peered down at her guest, noticing the hands behind her back.

“What do you have there? You didn’t touch anything, did you?” Twilight warned, trying to look around Princess Twilight’s body. Princess Twilight shifted to keep the scientist’s prying eyes away, freeing a hand to wave in front of her face.

“What? No, of course not! I… It’s something I brought here.” Twilight stuttered, not exactly lying to her mirrored self about the situation at hand. Twilight looked over her thick-framed glasses, her curiosity peaking even more at the reply.

“Show me!” Twilight lunged forward with the Princess keeping just far enough away as to not get caught. Princess Twilight sighed and revealed the bottle of the transformative solution as the scientist’s eyes widened in awe.

“It’s not stable as you can probably guess. And given the documentary I just watched, there’s a lot of improvements that can be made to create a perfect snake-human form!” Princess Twilight mentioned as her mirrored self examined the bottle, taking it to her workbench. Putting on her lab coat and safety goggles, she began to entertain the idea of the scientific experiment that the Princess was proposing.

“Originally you were here for tests, but if I can accurately complete the solution, it could serve as the details to rid yourself of the genetic modifications before returning home!” Twilight began setting up her equipment as Princess Twilight watched on from the side, focusing her attention on the scientist’s handiwork.

Watching the test tube spin around in the various scientific equipment that the scientist Twilight at her disposal, Princess Twilight couldn’t help but scratch at her neck. The urge inside her swelled as the solution poured into a glass flask, not as cloudy as Sunset Shimmer’s original product. Twilight certainly was able to improve the composition of the mixture in ways that none of them seemed possible.

“It’s quite lucky that I had a stock of snake venom on hand!” Twilight swirled the liquid in the flash, attaching a scientific atomizer to the opening on the top. “Now, the reason for the imbalance in the snake-like traits was because the solution was balanced for the amphibian saliva that was unfortunately not used. With this new solution, the snake influence should be somewhere around 99.83% accurate!”

“Oh! Should we test it out? I mean, for the sake of science,” Princess Twilight asked, trying to downplay the idea.

“It’s a dangerous gamble if I’m being honest. My solution should keep the Equestrian magic influence in check and since there’s no trace evidence of the Elements of Harmony in the lab, then any test subject would be safe from the overwhelming lust accompanied by the transformation.” Twilight answered as Spike swiped the flask from his owner’s hands, taking it to the Princess Twilight.

“Sounds good to me, science me!” Princess Twilight shouted as she gestured for Spike to squeeze the atomizer with his paw. Spraying the solution in Princess Twilight’s face, the scientist froze in horror at the exposure that had taken place in her laboratory.

“I was going to say,” Twilight began, shooting a stern look to Spike as Princess Twilight held her hands on her face. “The test subject would have not previously been exposed to the faulty solution, otherwise… well, the variables are too much to theorize!”

Princess Twilight closed her eyes, running her hands on her cheeks. The droplets from the solution began to sink into her skin as the urge inside her grew stronger. Twilight quickly grabbed her notebook, making notes of the sudden exposure for her experiment’s data. Looking over at her subject, Princess Twilight’s shot open wide with the snake-like slits from her transformation earlier.

“It’sssss working!” Princess Twilight answered, giving a soft chuckle as her tongue began to hiss in her mouth. Pulling her hands away, the skin on her cheeks became hard as strong, scales grew on the sides of her face. Blinking with her new eyes, she could feel her face start to stretch out as her vision expanded to suit her new eyelids. A small set of holes opened up along her nose in from of her eyes as her tongue shrunk down to make her hissing louder against her hard, scaly lips. Princess Twilight was now keenly aware of the hot-blooded scientist figure standing in the room with her as she felt her pulse race with her overall body temperature rapidly dropping.

She groaned as her feet began to rip away the loaned shoes that the Princess had received from the school. The scientist Twilight watched on as the transformation took place in front of her, continuing to take notes of the process. Both Twilights were confident in the new solution, but there were still so many unknown variables that would affect the final product of the Princess’s new form.

Princess Twilight felt her fingers grow stiff as her nails grew sharper. Her skin became cold and covered in scales as her instincts told her to rip away the pair of baggy sweatpants, exposing her bare legs to the scientist. Twilight focused as her test subject continued through the transformative process with her legs starting to merge as they became covered in cold, hard scales.

With a loud moan, her hips widened as the thick scales wrapped around the Princess’s lower half, shredding her loaned underwear to pieces. Twilight’s cheeks reddened at the sight of her mirrored self’s exposed womanhood under a significant purple bush. Her thoughts trailed to the argument of whether pleasuring the second version of yourself counted as intercourse or masturbation from a scientific perspective. The Princess’s long moans from the steady transformation didn’t help to stop these thoughts from crossing the scientist’s mind.

Princess Twilight ran her hands down her lower half as the shift to a long, scaly snake tail was complete. Tearing away the grimy loaned sweatshirt, she exposed her naked breasts as the lust inside of her began to grow. Her body was as cold as ice, but that didn’t stop the fire of her sexual and predatory instincts from taking hold. Giving off a sideways blink, Princess Twilight’s snake eyes honed in on the scientist, fanning herself with her notebook from the strong allure of her transforming test subject.

Slithering back and forth in front of her prey, Princess Twilight used her strengths to her advantage to capture the scientist Twilight. Her breasts grew out as the scales wrapped around her, completely nude in her anthropomorphic form. Twilight’s fears had proved correct, but her arousal at her creation took over her scientific mind under the lamia’s allure. The Princess hissed as the scientist’s eyelids grew heavy, completely dazed by her charm.

Poised to strike, Princess Twilight wrapped her tail around her mirrored self’s soft body. She pressed her thin, slender tongue against Twilight’s neck as her old womanhood tingled as the transformation continued. The scientist looked down with a wide expression as a large, slick member grew from underneath the Princess’s midriff. Twilight could feel her arousal soaking the panties under her skirt, completely under the will of her monstrous creation.

“I ssssshould thank you, sssssscientist,” Princess Twilight hissed before she moaned, allowing a second, equally-thick member to form against the helpless scientist.

“How… scientifically accurate~” Twilight moaned, resisting the urge to get a hands-on evaluation of the new equipment.

The Princess hissed as she showered her prey in her hot venom, using the acid to melt away her lab coat and the clothes underneath. Twilight moaned as her nude body was exposed to her captor, her human womanhood slick with her juices at the sight of the lamia’s two members.

“Double your pleasssssure, missss~?” Princess Twilight hissed as her scaly hands gripped onto Twilight’s soft shoulders, lifting her into the air. The scientist was in awe at how the transformation grew the average-sized Princess into a towering monstrous creation, with her eyeglasses fogging up from the heat of her own body under the magical allure.

Twilight nodded in pure enthusiasm as the lamia slid her down on one of her slick, hard rods, hearing the human scientist moan as she pushed into her. Her tail coiled around her soft body as Princess Twilight thrust herself into her, bumping her cold, scaly hips into Twilight’s soft thighs.

With the upper half of her body bound by the snake tail, Twilight moaned as the lamia’s length pumped into her soft opening. Her toes curled from her spread legs as the hard scales of the Princess’s tail pressed against her warm breasts, stiffening her nipples in her bind. She had never felt pleasure like this as Princess Twilight’s allure washed over her.

Princess Twilight loosened her coil around her prey as she slipped out of her soft opening, letting the scientist Twilight’s juices spill out onto her hard length. She turned her around, teasing both of her open holes with the tips of her members. Hissing in her ear, Princess Twilight pushed into her with twice the penetration, making her prey moan out in pure ecstasy. Her tail moved back and forth as she pumped into her, pressing her scaly breasts against Twilight’s warm back.

Feeling the full effects of the lamia’s allure, Twilight could feel herself getting closer to her edge as the Princess’s lengths filled up every inch of her tight openings. She panted as Princess Twilight’s members twitched, letting out a long hiss before trailing into a more audible moan. Twilight couldn’t help but feel herself pushing back on the lamia’s cold, scaly body as the Princess’s pumped deeper into her slick slit. As Princess Twilight’s gripped tighter onto the scientist’s body, she felt a wave of pleasure wash through her as she filled her prey with her hot, sticky juices. Twilight moaned at the sensation of the Princess’s dirty, warm seed flowing through her. She gasped as the lamia pulled away, allowing the sticky juices to spill out of both of her pleasured openings.

Princess Twilight licked her fingers at the sight of her prey being sufficiently pleasured, letting her mind form a new plot to match her new lustful form. She slithered over to the counter filled with all of the scientist’s instruments with the perfected version of the solution. Princess Twilight grabbed a test tube as she extracted some of her acidic venom from her fangs, pouring it into the flask.

The innate Equestrian magic that the pony princess had brought to this new dimension made the scientific solution spark and fizz with a new property. She grinned as she mixed the solution, running her scaly hands to her slick members, getting a thick sample of her and the other Twilight’s sticky juices on her finger. She mixed the ingredient directly, allowing the solution to bubble into a heart-shaped plume of smoke.

“Perfect~” Princess Twilight giggled as she slithered back to the scientist, who was starting to come to at the sight of the lustful lamia in her lab. “I have to give my thanksssss, sssssscientissssssst,”

Twilight gulped as the solution bubbled with a strong, pink glow. Her once perfectly balanced equation was dangerously unstable with all of the additions and inclusion of a strong source of Equestrian magic, leading to a catastrophic disaster left in the Princess’s hands. She struggled to stand up as the lamia cupped her scaly palm against the scientist’s warm cheek.

“With thisssss, I’ll have ssssssssso much fun with my… friendsssssss~” Princess Twilight hissed, using her strong allure to send Twilight into a daze. The last thing that the scientist saw was the figure of the lustful lamia, slithering away as Spike ran towards her side, barking at the monster.

“Twilight? Twilight!” Spike shouted, pushing his paws into Twilight’s arm as she ultimately lost consciousness into a deep, magic-induced sleep.