My Girlfriend's a Centaur Now? Part1
Story by Natron77 on SoFurry
Life on Earth would never be the same. All over the world, 15% of humanity suddenly became part animal. From centaurs to mermaids, people of all walks of life found themselves transformed overnight.
In addition to the stress of the crazy new world, many relationships struggled, particularly in bed.
It should have been a day like any other, but something happened the night before that changed the world forever.
“Serah, why didn’t you wake me up?” a man grumbled sleepily as he sat up in bed. His name was Shoto and he had short black hair, warm brown eyes, and a slightly round face. The clock said it was 8am, meaning he had only a few minutes to get ready and leave for work. The Tokyo commute was hell, but he’d found a route that got him there on time as long as he left the apartment by 8:15.
Shoto turned and saw his girlfriend across the bed. She was always an early riser and usually woke him every morning with a cheerful kiss. The fact that she hadn’t done so this morning, even though she was awake and right there in the bedroom, suggested something was wrong.
The dumbfounded expression on her face proved it.
She was standing at the side of the tall bed, staring down at her legs. Her shoulder-length brunette hair was a total mess as if she hadn’t touched it since she’d awakened, but that would have been an hour prior. She was wearing a loose pink shirt, worn thin by how often she had slept in it. It did little to hide her pleasantly perky breasts.
“Serah? Are you okay?” Shoto asked. He quickly got out of bed, wearing just some black boxer briefs, and walked around to her side. As he rounded the corner of the waist-high bed, his gaze involuntarily followed hers and he saw what she was staring at. He instantly knew that Serah was not okay.
For some reason, her purple panties had been reduced to just a waistband and some tattered cloth. Below that, where her bare legs should have been, there was a bunch of brown fur. The fur covered two spindly legs with knobby knees, ending in two dark and solid things that definitely seemed to be hooves.
Hooves? What? It was all Shoto could think. And judging by Serah’s face and her frozen state, it was all that she could think too. She’d been stuck in a loop, thinking it over and over for possibly as long as an hour.
But then he noticed what was behind her. From just above her hips, more of that brown fur extended backwards for several feet. Shoto stepped sideways and saw it for what it really was: the body of a horse, complete with four legs.
His mind raced. It was filled with dozens of questions, but the answers weren’t actually important. What was important was the woman in front of him, the love of his life, and how she was doing. Not only did she likely have some of the same questions he did, but she had to deal with the added impact of this mysterious horse body being her body.
She was still so transfixed by the legs that she hadn’t noticed the rest yet. Shoto sprung into action, wanting to soften the blow before that little revelation crashed in on Serah like a stampede. He stepped up in front of Serah and wrapped her in a tight hug. In the back of his mind, he was pleased to note that she was still the same height, about two inches shorter than him.
“Serah, I don’t understand what happened, but I will be here with you through it. Maybe this is a dream, or maybe it’s real, but we need to stay calm and collected.”
“My legs,” Serah finally said, her voice soft and sweet and innocent as always. Extra-innocent in fact, given her ignorance of the full scope of her issue.
“Yes, they seem to have changed,” he replied. “I need you to take a deep breath for me, okay?”
Serah nodded and looked into Shoto’s brown eyes. Her green ones were panicked and wide.
Only after she finished a deep and slow breath, Shoto said, “Other parts of you seem to have changed too. Stay calm, but look at your butt.”
A glint of fear crept into her eyes, but she stayed calm and turned her head slowly. She didn’t need to turn far to see what had happened. Several feet of sturdy brown body extended horizontally from her lower back, and a long brunette tail stuck out at the end. The surprise of seeing it sent the tail twitching in perfect sync, and sent its sensations directly to her brain. That was the proof she needed to believe that the body was actually hers.
“I’m a horse?” she asked. Always a level headed woman, she quickly corrected herself, “No, a centaur.”
Then she reached up and pinched herself on the cheek, hard enough to really hurt and likely bruise. “Not dreaming,” she mumbled.
Shoto grabbed her hand before she could hurt herself more. “Not dreaming,” he confirmed. Then he stepped back and reached for his phone, which was charging on the headboard of their bed. “I’m calling out from work to help you. While I do that, can you make us some tea? I think it would be good for you to do something comforting and familiar.”
Serah nodded slowly, then pivoted awkwardly to exit the small bedroom, her hooves clopping softly on the floor. While the body was brand new, she somehow already knew how to use it pretty well.
“And keep the blinds closed. I feel like we should keep this quiet for now,” Shoto added.
Keeping it quiet was totally unnecessary. All across the world, people were hiding in their homes, racing to hospitals, and in some cases rioting. Religious nuts called it a sign of the apocalypse, politicians called it ‘The most trying event in humanity's history’, and newscasters babbled uselessly about what might have caused it.
Regardless of the cause, the results were clear: the night before, as midnight hit the international date line, a transformation began in a random portion of the human population. Any selected people who were awake at the time felt unbearably ill and tired until they went to sleep. All the affected people were fundamentally changed by the time they next awoke.
In total, fifteen percent of all humans had become part animal. They gained things like tails and fur, wings and antennae, and sometimes even extra arms and legs. In most cases, their new appearances matched those of famous mythical creatures, but some were brand new creatures.
Within 24 hours, the public had started calling it the ‘Great Change’, and within another day, all major world governments had banded together to protect the Changed people. Some extremist countries tried to kill their Changed residents, but larger countries with military might came to their rescue, liberating animal-people by the thousands.
Japan was the one of the more receptive countries. By the third day, the government had placed dedicated experts in designated hospitals all over the country, ready to help Changed people understand their new bodies. Serah and Shoto visited one of those hospitals, and that’s how they came to meet Dr. Akido.
Dr. Akido was a shorter woman, with bob-cut black hair and an unthreatening demeanor that didn’t dampen her air of aloof intelligence. She had mentioned offhand that she used to be a farm veterinarian before becoming a human physician, and that it was likely a factor in the government selecting her for the new role as a Great Change specialist.
After meeting with Serah in private for over an hour, she greeted Shoto in the waiting room and beckoned him to follow her. As they walked, she explained, “Serah didn’t want to be here for this part, so she’s getting dressed in another room.”
Shoto’s step faltered slightly at that ominous phrasing. “What is ‘this part’ exactly?” he asked.
“Where I explain to you how her body works now. I’ve explained it all to her, and I offered to let her tell you herself…” she said, trailing off.
“But she was too embarrassed,” Shoto finished. “That’s just like her.” He smiled. It was good to see that some things hadn’t changed at all.
Dr. Akido smiled and nodded, then directed Shoto into an exam room.
When he stepped inside he immediately noticed the familiar smell of his girlfriend’s perfume, but there also a deeper animal smell that he vaguely recognized. He had caught whiffs of it from time to time over the previous couple days. He realized now that it was the smell of Serah’s fur-covered half, and that she had been trying to hide it with perfume.
The doctor noticed his sniffing and said, “You’ll get used to the scent, and it will lessen once she starts using appropriate coat-care products.”
Shoto glanced around the room in an effort to distract himself from the strange topic. He quickly noticed a long glove in the trash can. It was shoulder-length and it looked wet. He immediately tried to push that out of mind.
Fortunately, Dr. Akido directed his attention to a diagram that was projected on the wall. It was a simple handmade drawing, but it was very neat and detailed. The diagram clearly depicted a centaur and its internal structure.
“When the Change hit, several of Serah’s organs moved around.” She pointed with a stick at the upper body of the centaur silhouette. “As you can see here, her heart is still in her upper rib cage, but it is much larger, in order to serve her larger body. And down here, the lower rib cage in her so-called ‘horse’ part is where her new and more powerful lungs are. Keep that in mind if you ever have to perform the Heimlich Maneuver.”
“So her throat is…” Shoto started.
“Her esophagus is quite long, yes. Like a giraffe in some respects, but better protected by the rest of her upper body.” She moved her pointer to the upper body’s belly area. “Most of her other organs stayed put, though some got a bit bigger. The biggest remaining changes are in the digestive and reproductive systems.”
The word ‘reproductive’ caught Shoto’s attention. Sexual desire aside, Shoto hoped to have kids someday, and he’d been secretly worried that the Change would affect that. To his dismay, Dr. Akido quickly shot down any remaining hope.
“Her reproductive organs here”—she tapped on the upper body’s belly area again—“appear to have shut down. They are all still present, but her ovaries are entirely off. Since her urinary tract also moved to the lower body, the entire vaginal area is pretty much cosmetic at this point.”
She winked and added, “Though she did say she still feels pleasure there.”
“Wait,” Shoto said slowly. “If her urinary system moved, then—”
“Yep, she’s got a ‘horse’ vagina too. The entire reproductive system, even. So far, it seems that all Changed quadrupeds got this duplication. If the Great Change was done by a conscious being, they were kind to not fully take away those people’s previous genitals.”
She smiled a weary and sad smile and added, “And before you ask, we have no idea if the new reproductive system is functional or compatible with human sperm. That research is still in progress.”
Shoto nodded firmly. “I understand. In fact, I’m surprised with how much you already know.”
“There’s nothing quite like a global calamity to get people working together and sharing information,” Dr. Akido said with grin. She was clearly excited by the new scientific prospects coming in the near future.
“Oh, and before we move on, her large intestine and anus moved to the lower body as well. Modern toilets weren’t designed for horse butts, so I’ve recommended that she stick to traditional Japanese squat-style toilets whenever possible.”
Shoto blushed at that blunt statement, but nodded.
After a couple more brief anatomy lessons, Dr. Akido escorted Shoto back to the waiting room where Serah was already waiting. She galloped into his arms and hugged him tight. He couldn’t pick her up in a bear hug anymore, but she was still the same Serah he’d fallen in love with.
After the hug turned into a kiss that almost turned indecent, Shoto turned to Dr. Akido and said, “Thank you, doctor, for everything.”
“No problem. If you have any questions or issues in the future, please call me. I’m here to help you, and the government can use your experiences to help others in similar situations.”
Then she put a kind hand on Serah’s shoulder and said, “Take care of each other.” The words carried the unspoken message that their troubles weren’t over just yet.
Serah’s day to day life didn’t change as much as she had expected. After a few days of calling in sick and hiding at home, she finally worked up the courage to return to work, only to find that her supervisor had become a literal merman, gills and all. He refused to let the Change affect how anyone was treated around the office, and her mood was lifted when she saw that he was still respected by his peers in his new form. In some ways, he was even worse off than Serah, particularly in terms of mobility.
Her best friend at work, a plain little woman named Deci, even wished that she had been changed. “It could have been my chance to stand out. No one notices human Deci, but catgirl Deci, or butterfly Deci, or even shark Deci… They’d have to pay attention then!”
“It isn’t that great, you know. I don’t even want the attention, and I can’t fit in most cars anymore, or use most bathrooms. And my wardrobe is mostly useless now. Every skirt and dress, all my cute socks and shoes…”
Right after the change, Serah had stitched together a simple skirt to fit her new body and modified some of her underwear to fit each of her two private areas, but her selection of clothes was still very small. She frowned deeply and thought to herself, I was wearing my favorite panties when I Changed, and they were totally destroyed.
“Can I have them?” Deci brazenly asked. “If you don’t want them anymore, that is.”
Serah was weirded out by the question until she realized Deci wasn’t talking about the panties. She answered, “I’m going to try to tailor the dresses and socks into something I can wear, but you can have the shoes, I guess.” Serah’s feet were the same size as Deci’s, or at least they had been, before the Change.
“Aww, you’re the best, Serah. Can I swing by tonight and pick ‘em up?”
“Uh, I have plans, sorry,” Serah mumbled and immediately turned beet red. She was terrible at hiding her feelings, and she was thinking of the romantic evening that she and Shoto had planned.
Deci knew all Serah’s tells, although the adorably twitching tail was a fun new one. She smiled and said, “Say no more. Good luck, Serah.”
Thanks. I’ll need it, Serah thought. She would never say this aloud, but she’d had sex several times since the Change, and never once was she able to reach orgasm. She was hoping the extra romance planned for that night would make a difference.
Shoto left work early to get home before Serah and prepare an elaborate dinner. He was using a lot of fresh veggies, which she enjoyed more since the Change, and he’d even bought a very nice bottle of wine.
He was hoping tonight would be the night for Serah. Their relationship had always been rather physical and sexual, and he was worried that the Change had hurt Serah’s self-confidence. At the very least, the stress of it all wasn’t doing her libido any favors.
He still loved her, and he loved her body. The Great Change didn’t affect that as much as he’d expected. He had cooed and coaxed her into some pleasurable sex, but never got her to an orgasm. But tonight, I’m really gonna lavish love on her ‘til she finally comes!
Their dinner date went perfectly and Serah quickly got into a very frisky mood. While Shoto was attempting to serve dessert, she nuzzled up to him and whispered, “I’ve had enough food. I want something else in me.”
Shoto blinked in surprise. That had been incredibly risque for the easily-embarrassed Serah. He set the bowl of berries and cream down and said, “Alright, honey. Shall we retreat to the bedroom?”
She pressed her body against him and started pushing him backwards, toward the couch. With her four legs and extra mass, she easily overpowered him. “How about here?” she asked meekly.
While her words were restrained, her hands were not. She was already undoing the buttons on Shoto’s dress shirt. By the time she got him backed against the couch, she even had his belt undone.
They each undressed the other until they were both entirely naked. Serah had even removed the underwear on her back half, lest they get wet. Then Serah pushed Shoto down onto the couch and straddled him with her front legs. Her hindquarters were firmly planted on the ground, giving her a lot of leverage and control of the position.
“You are beautiful,” Shoto said, then he kissed her before she could doubt the words or respond. The kiss turned into an open-mouthed one, then he added his tongue, darting it along the bottom of her upper lip.
She moaned into it, so he kept going and he added his hands. They slid over her back, her shoulders, her breasts, and down to her hips. Other than the soft brown fur there and the lack of a squeezable booty nearby, her wide hips were very similar to before. Then his hands wandered to her belly and crotch, which were totally unchanged.
Shoto was about to step things up with his fingers on her pussy when Serah took charge again. She grabbed his erect penis and pressed it against her already-wet opening. After a bit of wonderful teasing up and down along the slick slit, she popped it inside.
Shoto gasped. His cock felt amazing as it was enveloped by her bare walls. If there was a silver lining in the Great Change, it was that he could now ride bareback, so to speak, with no need for any form of birth control.
Alright, he thought, if she’s running that show, I’ll help her out up here. He cupped a perky and pillowy breast in his hand and brought his mouth to it. After a few light and testing licks, he applied some suction directly on the nipple. As Serah bounced up and down on his cock, the nipple was tugged in time in a way she loved. But he also had another trick to apply.
He opened the right side of his mouth and breathed in sharply, pulling cool air across Serah’s wet nipple while he licked up and down quickly. The result was a blast of several sensations all at once. Serah’s body stiffened in a way that screamed, ‘Keep going!’ so he did. And he added massaging pressure on her lower back, pushing in time with their synchronized hip motion.
The combination of his intense focus on the task at hand and the wine in his system let him keep going without fear of coming too soon. Sometimes the dampening effect alcohol had on his ability to get off could be annoying, but it was serving him well this time.
Meanwhile, Serah’s hands were between their bodies, her fingers working furiously at her clitoris. She occasionally gave herself a hand in that way and before the Change it had always got her quickly to orgasm.
This time, it did not. They kept at it for another 15 minutes, trying every pleasurable variation they could, until their bodies ached and their genitals could take no more. But she never got there. Shoto also went without orgasm, since his failure to get Serah off was a substantial bummer.
Panting, their movements came to a stop. Shoto held Serah close and whispered, “I love you.”
“I love you too,” she replied, but there was sadness in her voice.
“I think we should…” he started, but he trailed off, not sure that he wanted to say anything just yet.
“…see the doctor again,” Serah finished.
He nodded and pressed his forehead to hers. “Yeah.”
They had to wait several days for an appointment with Dr Akido, since it would be their second visit and it wasn’t an emergency. Great Change specialists were in very high demand, after all. When the appointment finally arrived, Serah didn’t delay in telling the doctor what the problem was.
“I can’t orgasm any more,” she said flatly.
Shoto, seated next to her, blushed and looked at the floor.
Serah continued, “We’ve tried a bunch of things that used to be reliable ways to get me off. They still feel great, but I just can’t reach… uh, it.”
Dr Akido nodded as she listened, then said, “I can’t go into specifics due to privacy laws, but I’ve heard a similar thing from another patient who got a second set of genitals in the Great Change. I have a theory about the cause, but I’d like to confirm it via a test.”
Shoto and Serah shared a glance. “Okay,” Serah said.
“First, I assume you’ve only been having sex with your human side?”
The couple nodded shyly.
“I figured as much. Now, I need to ask Serah some personal preference questions. Shoto, can you step out for a minute?”
After Shoto returned to the waiting room, Dr Akido asked Serah, “Regarding your sex life before the Change, what kind of genital stimulation gave you the most pleasure: clitoral; vaginal, including girth; or cervical, meaning depth?”
Shyly, Serah whispered, “I guess all three? My favorite toy was a large rabbit-style vibrator…”
The doctor nodded, not casting any judgement on Serah’s choice of sex toy. “Alright, I’m gonna prescribe you a very specific tool. You’ll have to custom order it, but since it is a prescription your insurance will cover it, as long as you order from a place that knows how to bill it properly.”
“Okay…” Serah said as Dr Akido scribbled something on a piece of paper.
The doctor took a deep breath and said, “Take your rabbit vibrator to this shop, and give them these measurements. They’ll make a scaled-up replica for you to try out. Don’t force it, but the next time the mood strikes, use the new tool while you have sex normally. Then report back to me.”
Serah took the paper and read an address labeled ‘Tokyo Reproductive Recuperation’. There was a list of numbers after that: measurements for her new sex toy. She read the measurements and her jaw dropped. “No way. These numbers are huge!”
Dr Akido nodded and shrugged. “Yep, that’s how large you are down there now. I went with the baseline measurements, so this may even be a bit small if you really like to feel stretched.”
Blushing brightly, Serah said, “Oh, alright. I think I’ll be okay…”
Serah, with no small amount of embarrassment, ordered her new toy that day. However, the shop needed a couple days to make it. When it was finally ready for pickup, the idea of it excited her enough that she wanted to try it that very night.
When she got home with her discreet and surprisingly heavy box, she opened it and marveled at the massive toy. It was shaped similar to her favorite rabbit-style vibrator, but larger in every dimension. Similarly, its motor was substantially bigger than that of the vibrator it had been modeled after, so standard batteries simply couldn’t output enough power. Instead, it had a power cord so it could be plugged directly into the wall. Thankfully, they had an extension cord around the house so that the toy could reach any part of their bed.
At first, Serah was too embarrassed to let Shoto put the new vibrator in her lower half, so she tried it herself. It didn’t take long for her to admit that the angle was too awkward and uncomfortable to reach properly. Eventually, she yielded and let Shoto handle it.
“Don’t look,” she begged, covering her face with both hands.
“I have to look, honey, so I can tell what I’m doing,” he said, but secretly, he really wanted to look. He wanted to see all the new and erotic parts of his girlfriend’s beautiful, if unusual, body.
Serah distracted herself by playing with her breasts and pussy, or at least her front one, in order to stay aroused. Meanwhile, Shoto maneuvered the hefty toy into place. It was as long as his forearm and as big around as his fist. He tried very hard to not compare it to his own manhood, which was average by human standards but couldn’t compete next to that super-sized dildo.
Surprisingly, it slid in easily, suggesting that it was potentially too small. While back there, Shoto cast a couple admiring glances at Serah’s pussy and ass, and found them wonderfully intriguing. He’d never been attracted to horse anatomy, but this was his beloved Serah, and now she had new exotic and sensual places. He made a mental note to ask to go exploring a little some time, when Serah was in a good mood.
Serah felt the toy enter and she definitely enjoyed the feeling of fullness, but it wasn’t all that strong on pleasure. That is, until the toy turned on. The instant Shoto switched the vibrator on, Serah was slammed with pleasure she’d never felt before. Nerve pathways she’d never used before fired into action, sending brand-new sensations to her brain.
The toy narrowed before its extra wide base, so it stayed firmly inside of Serah’s pussy. Shoto crawled on the bed, around to her front. He was already aroused and erect and ready for fun, but Serah shivered and held up a hand, palm out. “H-hold on. I need t-to, uh, get used to—” She took a quivering breath. “U-used to this.”
At first, Serah thought she’d orgasm from the toy alone, but the feeling faded as she got accustomed to all the new sensation. She waved Shoto over and sat down on his lap, face to face.
He guided himself into her vagina, then kissed her sweetly on the lips. He didn’t get a chance to do much else.
Almost immediately, the erotic thought and the physical sensation of being filled in both pussies set her off. She grabbed Shoto tight with both arms, let out a sultry moan, and had her first orgasm of the night. Her first since the Great Change had hit the world over a month prior.
Thankfully, Shoto was still hard and Serah was capable of multiple orgasms. The toy in her lower body was nice and secure, leaving all her attention on her actions up front. Her strong front legs controlled the thrusting speed to great effect while Shoto had easy access to her chest.
By the time Shoto couldn’t hold out anymore and finally came, Serah had gone at least seven times. For another few minutes afterward, Serah left the toy and dick inside and just savored the feeling of fullness in both vaginas.
Eventually, Shoto got too soft and slipped out, making a bit of a mess. While Serah wiped it up with tissues, she asked, “Can you please turn that thing off? It’s getting to be too much…”
Shoto scooted out from under Serah to get to the toy, making a mental note to buy one of those remote-control outlet plugs made for lamps so that they could control the toy while it was far away. That seemed like a very minor problem to have, all things considered.