Call of Seaquestria

by Nicole Sunstone

Rating: mature
Tags: Twilight Sparkle (EqG), Slice of Life, Alternate Universe, Fetish, Equestria Girls, Porn, Spike (EqG), Sex, Science Fiction, Profanity
Length: 2702

Sci-Twi works on an experiment to turn herself into a pony when she encounters an unexpected transformation as a result.

Interested in the equine form, Sci-Twi performs an experiment with science and magic to turn herself into a pony. When the experiment appears to have failed, she resigns herself to a bath where the magical transformation from scientist to Seapony occurs.

This story was sponsored by a generous fan through my Patreon! If you want your own one-shot, full-length or monthly ongoing story, please consider supporting me on the link provided! Thank you!

Fetish Warning:
There is a mild instance of urination included in the story in a non-sexual situation. Please be aware of the content.
Thank you. :)

Published 2018-03-05 14:40:07 UTC
Last updated 2018-03-05 14:40:07 UTC

Chapter 1

Call of Seaquestria

By: Nicole Sunstone

“I’ve almost got it, Spike! I can feel it!”

Twilight Sparkle, wearing her white lab coat and large black frame glasses, carefully measured one of the various chemicals around her as she slowly placed a drop of it into the beaker. The light blue liquid swirled around as the solution changed to a deep purple color. Spike, being the dog that he was, jumped up next to his scientist owner and wagged his tail happily.

“You’ve solved it?” he asked, scratching behind his ears with a paw. Twilight spun around in her seat, looking over the various notes on the table. Pictures of the other Twilight Sparkle at Canterlot High School, who actually came from another dimension where she was a pony Alicorn princess, accompanied the folder, along with meticulous calculations.

“If I’ve done my research correctly, then this solution should have enough of Princess Twilight’s essence to successfully transform myself into a pony as well!”

Twilight carefully examined the solution, seeing it still holding its purple color inside of the clear beaker. Taking notes of the level of the liquid measured against the graduate cylinder, she wiped the beads of sweat from her forehead. Spike watched as a single drop of the saline liquid from Twilight fell into the beaker with a quick splash. His ears perked up as Twilight began her preparations for the final step in making the potion.

“Now, with my geode’s connection to the Equestrian magic in this world, it should super-charge the molecules in the solution to give me more pony-like traits than just ears and wings!”

Twilight focused on the beaker as she gripped onto the purple star pendant around her neck, channeling its energy into the solution as her magical telekinetic aura surrounded the beaker.

“Uh, Twilight!” Spike warned, pointing at the beaker as it began to bubble and sizzle under Twilight’s magic. Twilight’s concentration broke as she turned to look at Spike and then at the solution.

“What is it, Spike?” She asked, grabbing the beaker in her hand.

“I think something might have fallen into that potion!” Spike replied, pointing frantically as the solution glowed with the same radiant energy as Twilight’s magical aura.

“Nonsense Spike! I double-checked everything that went into making the solution and there’s only a 0.005% chance of any contamination while in this lab. That coming from you shedding your fur, of course.”

Spike’s cheeks turned red at the comment before shaking his head and straightening his tail.

“I don’t shed fur on the experiments!” Spike refuted with a short growl. Twilight giggled and wafted the potion’s aroma towards her nose.

“My point exactly,” Twilight jotted down a quick observation before taking a deep breath and slowly exhaling, holding the beaker up in front of her. “Now watch as I become a mirror image of my Princess self from another world!”

Before Spike could say another word, Twilight had brought the edge of the beaker to her lips and began to drink the contents of the glowing, magical solution. Leaving only a few drops in the glassware, she slowly set it down and closed her eyes as she waited for the transformation. Spike bit down on his paw as he watched, hoping that Twilight would just become more horse-like and nothing else bad would happen.

Twilight’s eyes opened as the solution settled in her stomach. She looked at her hands, still seeing the same purple fingers. She bent forward to look at her legs, still the same with no signs of her feet becoming hooves. Running her hands over her ears, they had not become furred or pointed but still the same ears she had always had. Touching her forehead, there was no Unicorn horn or anything of the sort.

“But this can’t be happening!” Twilight shouted, quickly running over to the table on her two legs. “The calculations and the magic of the geode, everything should have led to the ponification!”

Spike breathed a sigh of relief as Twilight pulled down the back of her skirt slightly, expecting a long pony’s tail to sprout out from the base of her spine. She groaned at the sight of her bare back with no apparent pony-like qualities.

“Maybe it’s for the best! You could always ask Sunset to talk to the other Twilight about maybe crossing over to that pony world so you can see what it’s like.” Spike suggested as Twilight’s breathing became shorter, getting more frantic as she looked over all the notes and observations that she had made.

“It was supposed to be an instantaneous reaction! Ugh, I knew I should have asked for Sunset’s help for this.” Twilight said, tossing the notes onto the desk beside her. Spike shrugged and curled up, feeling the need for a short nap. Twilight pulled out her cell phone and scrolled through the contacts as she looked for Sunset Shimmer.

Flicking through her phone, Twilight made her way up the stairs out of her lab and closed the door behind her. Landing on Sunset’s profile, she pressed the call button, the phone dialing the number. Her fingers tapped on the banister to the stairs as she waited for Sunset to pick up. Suddenly, a mild discomfort came from her stomach.

Crossing her legs, Twilight quickly whipped around the handrail and started to rush up the rest of the stairs. Falling forward, she used her hands to push herself off of all fours as she reached the second floor. Looking around for any sign of her parents, she swiftly entered the bathroom and locked the door behind her.

Huffing from the sudden exertion of physical effort, Twilight hiked up her skirt as she quickly pulled down her panties to sit down on the toilet. Taking a deep breath, she let out a relieving stream into the bowl below. Her hands stayed on her lap as Twilight completely forgot about the call still in progress on her phone in her coat’s pocket.

As soon as the stream subsided, Twilight let out a sigh of relief as she reached to grab the roll of toilet paper on the holder. Taking off a square or two, she noticed a strange odor in the bathroom with her. Sniffing a couple of times, the pungent smell filled her nostrils as she quickly identified the chemical compound in the air.

“Ammonia? But I didn’t spill anything on my coat today,” Twilight commented to herself, looking at her lab coat for any ammonia solution stains on the white material. She then examined her skirt as the smell grew more apparent and stronger.

“Wait,” Twilight stood up from the toilet and leaned down towards the bowl as she examined its contents. The unmistakable odor hit her immediately as she coughed, having found the source of the ammonia. “Well, I guess energy drinks aren’t necessarily hydrating.”

Twilight coughed into her elbow as she looked closer at the color of the liquid inside of the toilet. The orange-red color of the urine puzzled Twilight as the liquid foamed at the surface.

“That can’t be healthy,” Twilight said to herself as she began to think of all the possible diseases and infections that unhealthy urine could be an indicator of in the long term. Suddenly, a loud horse’s whinny came through her mind.

Twilight paused and looked around the bathroom, not seeing anyone else, only herself kneeling down towards the toilet bowl. The whinny came again as a burst of realization came over her, causing Twilight to snap her fingers.

“I knew this smelled familiar!” She exclaimed happily, wafting the smell into her nose. “It’s the same odor as the stables of Applejack’s prized horses at her farm!”

With the mystery solved, she moved her hand to press down on the lever for the flusher but her thoughts started to get hazy from the scent that filled her nostrils.

“The potion must be working at least a little bit,” Twilight told herself, leaning away from the bowl. She looked down at her hands, still having her human fingers, and sighed at the delayed reaction. Her eyes drifted over towards the full-size bathtub to the side of the bathroom, a sense of relaxation running through her body. Letting the toilet water mellow, Twilight crawled on her knees over to the side of the tub, her thoughts filled with the idea of having a warm bath. “...but it’s best not to worry about that now.”

She leaned over to turn the faucets, fiddling with them to achieve the perfect mix of warm, but not too hot water, letting it fill the tub. Standing up, she stepped out of her panties wrapped around her ankles as she began to disrobe for the bath. Taking off her lab coat, she hung it on the door as she looked at her reflection in the mirror over the sink.

Twilight smiled as she undid her hair tie, letting her ponytail free as her hair flowed out behind her. Looking in the mirror further, she noticed her reflection looking more like a pony version of herself whenever the pony princess managed to visit their world. Her hands went to her collar, undoing the bow around her neck. Grabbing onto the bottom of her shirt, Twilight pulled it over her head as she left herself in her bra in front of the mirror. Her finger danced along her pendant around her neck, keeping it on in case of sudden perilous emergencies.

Twilight unzipped the back of her skirt, pulling it down her legs as she sat down on the edge of the tub without wearing any panties. Tossing the skirt off to the side, she took off her shoes and socks as she wriggled her toes, wanting hooves instead of feet. Reaching behind her back, she unclasped her bra as it slipped down her arms, letting her petite, perky breasts free.

Leaning down in the nude, Twilight took in the equine aroma still present in the toilet bowl. Her mind focused on the deep, pungent odor as she became less acquainted with the scientific side of her personality. She rubbed the back of her neck as the tub filled to the right level for her to get in, calling for her to enter.

Twilight took off her large, black-framed glasses, getting up to set them on the sink’s counter before she blindly made her way back to the edge of the bathtub. Stepping in, she stood in water up to her shins as she slowly sunk down into the water. Closing her eyes, she let her long hair float and soak in the water as the warmth wrapped around her.

Enjoying the relaxing setting, Twilight’s mind continued to wander towards the ideas of her pony self. The idea of being a pony that could gallop and frolic around in a field of tall grass. The freedom with the wind in her mane and tail. The stock stallions with the big, long co-...

Twilight’s eyes shot open as her chest rose and fell. She shook her head in the water as she held her hand against her chest. The lewd thoughts that filled her mind persisted as the aroma of the horses’ stables began to grow stronger in the bathroom. Twilight shut her eyes tightly as she tried to fight the thoughts of stallions and their hard, pulsing shafts. Having had enough, she took a deep breath and submerged herself in the water.

The warm bath water filled her ears as the thoughts disappeared, leaving only the deafening silence of the underwater world. Twilight kept her eyes closed as the relaxing sensation wrapped around her further, comforting her through a gentle wave. She held her breath as long as she could underneath the surface as what seemed like an eternity passed across her very eyes. Her thoughts became more and more relaxed as a cloudy sensation flowed over her.

Twilight’s hands ran down her body as she caressed her breasts under the water. Her other hand slipped down between her legs, much to her surprise. While the lewd thoughts had disappeared, Twilight’s heart raced for a quick relief to her overwhelming arousal. Her fingers rubbed against her soft, pink pussy, causing her mouth to open for a muffled moan, her eyes closing in pleasure.

Opening her eyes halfway, one of her hazy thoughts told her that she was no longer holding her breath. She could breathe normally as her hands explored all around her. Her mouth opening, Twilight moaned again as her purple fingers slid into her tight slit, her other hand squeezing and massaging her breast. Rocking her hips into her hand, her mind became more preoccupied with the pleasure filling her.

As Twilight Indulged in her affection, her toes tingled as they began to merge together with her feet. Her eyes opened wider as she looked over, continuing to pump her fingers into her aching pussy. She moaned happily at the sight of her hooves, appearing at last, as she sped up her thrusts. Her feet flattened out as she grew closer to her limit, tweaking at her pert nipples under the waves of the tub, the amount of water growing higher above her.

Clenching her thighs together as she pushed her fingers deeper inside, Twilight continued to watch the formation of her hooves. As the metamorphic process continued, her legs sealed together as the slick, smooth scales wrapped around them. Her thoughts stayed in a daze as another realization washed over her. She wasn’t becoming a pony underwater, she was becoming a seapony.

The split between her legs grew closed as Twilight edged closer to her limit. With her fingers tightly jammed in her slit, the soft opening magically shifted as Twilight’s lower half became completely merlike. Biting her lip, Twilight focused on her pleasuring herself as waves of pure ecstasy washed over her, as she let her hot, sticky juices flow out of her seapony pussy.

Hovering underneath the water, Twilight’s body followed suit with the rest of her changes. Her torso shortened as it became covered in scales. The hands softly caressing her breasts started to merge together, becoming flat hooves against her chest. Her arms shortened as her chest smoothed out, letting her petite breasts take form above the scales of her seapony tail.

Arching her back, a pair of thin, crystalline fins formed from Twilight’s shoulder blades. Knocking her head back, the scales traveled up the back of her head as her mouth pushed out into an equine muzzle. The necklace holding the pendant snapped off as it fell into the apparent increasingly deeper water of the bathtub. Her long hair merged together into a flowing fin behind her head as her ears shifted up her head, turning pointed and covered with purple scales. Focusing on her new thoughts and instincts, a Unicorn horn sprouted from her forehead as Twilight opened her eyes fully in her underwater state.

Reaching up to the surface, she grabbed a deep breath of air into her new lungs. Her tail flicked around in front of her in the tub, adding a long set of colorful fins similar to her mane’s color. Wriggling her backside, Twilight’s signature six-point star appeared and shined brightly along her scales as she looked around the bathroom.

She struggled to crawl out with her hooves as the seapony tail flopped behind her. Flapping her thin wings, Twilight didn’t feel herself even lift off the ground. Sighing in defeat, her eyes looked up at her horn as a magical aura started to form around it. Having a somewhat proficient use of telekinesis and a smaller, lighter body, she figured it was a worth a shot to go through with the idea.

Wrapping the magical aura around herself, Twilight managed to lift her own small seapony body up with in front of the mirror, noticing that she was indeed a seapony. She squealed with excitement, breaking the concentration of her spell as she quickly fell back down to the bathroom floor. Trotting back over to the tub, Twilight splashed back into the water and giggled, flicking her new tail happily at the success of her experiment.