(M and F Merging to F Centaur)

Sam took a long sip from his coffee, the kind of sip that left his glasses hazed from its steam. Then, he took a deep breath in, enjoying the crisp lakeside air. It was a rich flavor, of both the lake’s natural fresh water and some earthy scent he couldn’t quite place. There were days where it was great to be out in on the shore, and to truly feel one with nature. This was one of them.

Of course, had he realized what his companion was up to, he’d have run screaming back to the Jeep. But ignorance was bliss, after all, and the dark-haired man continued to enjoy his quiet moment, unaware that things were about to get a good deal louder.

Jane eyed her boyfriend, then looked to the ring she had just so ‘happened’ to stumble upon. She was a smart girl, and no stranger to the paranormal. From the moment she’d touched the golden band, she knew it was magical.

Plus, the whole place stunk like centaur. She had little doubt that Sam was a complete stranger to the scent, which made what she was about to do even funnier. The girl slipped the ring onto her finger, feeling a tingle of magic run through her body.

“As I’d suspected!” Jane narrated, the heroine of her own little fairy tale. “The ring happens to be a centaur’s loneliness solution. Of course, my anklet should render the change impermanent… And a little skinship with Sam should render the change interesting!”

Quickly, she slipped out of her clothes, casting a glance towards Sam and his adorably unaware stance. He was, regrettably, wearing a set of cute blue swim trunks that looked good on him. She’d need to apologize later, maybe.

“What was that?” Sam blinked, a chill creeping up his spine. He could have sworn he’d heard Jane plotting.

Some people might call it paranoia, but some people were lucky enough to remain human. Since discovering—and, regrettably, encouraging—Jane’s passion for the bizarre, Sam had ended up shifted into a number of different forms, in a number of compromising positions.

On guard, he began to turn, bracing himself for what was, no doubt, an inevitability. Unfortunately for him, Jane was already in motion. The brunette ran up to him from behind, her hands seeking out his pectorals like laser-guided missiles.

“Whoa! Jane? What the?” He managed, the force of her impact sloshing his coffee. He knew he had a difficult choice: try to hold onto his drink and scald himself in the process, or drop it and lose precious caffeine. Given that his mug was shatterproof, a lesson learned thanks to the sacrifice of dozens of ceramics, the choice was an easy one.

Jane grinned from ear to ear behind him, feeling the ring on her finger surge into life. If she’d simply worn it herself and let well enough alone, it would have changed her into some sort of toy for the centaur. But, when coupled with holding onto Sam for dear life…

Her smile widened as she felt the magic work its way along both of their bodies. Her hands sank into his chest, and she pressed her head hard against Sam, eager to see just how they’d merge. Already she could feel a tingle creeping along her skin as the patterning of their fur settled in.

“Hwormphf!” Jane replied as best she could, as her neck angled itself up into the small of his back. She realized she’d forgotten to take off her headband, though it felt like the change was taking care of that on its own.

Of course, there was a brief moment of panic as Sam’s body swallowed her face. Not being able to see or breathe was always a bit of a surprise, though as her body joined with his she soon had need for neither.

Her toes curled with excitement in the millisecond before they clumped together into thick hooves. Her legs reshaped behind her, thighs thickening and ankles stretching. Best of all, her butt swelled larger and larger still, turning into the tremendous horse ass she’d always dreamed of having.

A thick tail snaked out past her titanic hindquarters, lifting with an eager need. She felt it deep within herself, a warm pleasure slowly overtaking all rational thought—though doubtless Sam would claim she had little of that to begin with.

“Damnit, Jane! Not again!” He shouted, spreading his arms for balance. He could feel her becoming a part of him, a sensation he’d never dreamed to experience more than once. However, this was entirely different from when they’d merged into a naga.

Back then, his thighs had entwined around her head, pulling her body into his own and lengthening her frame into a scaly tail. This time around, it felt additive, like her form was as much becoming his as his was becoming hers.

Of course, he was still the one to suffer the more drastic changes. His cock shrank back into himself, and his balls pulled upwards, becoming a fertile set of ovaries. His well-trimmed facial hair retracted into his face, in time with the lengthening of his hair. It wasn’t much of a change to his hairstyle, at least. It felt like he’d take on a shoulder-length bob, rather than the back-length hair he’d anticipated.

Or… That she’d anticipated. Sam looked down with a blush, watching as her pectorals swelled into breasts. Jane’s hands joined with Sam’s chest, bone and muscle melting away into soft, supple, and sensitive breasts.

It felt good, though Sam would die before admitting that aloud to Jane. The last thing Sam needed was for her girlfriend to get any crazy ideas like letting this be a regular part of their relationship. Even with occasional changes like this, Sam’s bank account was hurting from all of the new clothes she had to buy. Speaking of, she’d probably need another swimsuit now, judging by those scraps of blue fabric that were fluttering off in the breeze.

Sam’s cup tumbled from her hand as she wobbled on her feet, feeling them shift and warp beneath her. She looked down and saw that her feminine thighs were a gentle shade of brown, all the way down to her white ankles. Her feet, on the other hand, were a deep taupe, the perfect shade for a set of hooves.

“Seriously? You’re turning us into some kind of centaur?” Sam’s protest turned into a groan as Jane nuzzled her face deeper into Sam’s back. She knew for a fact that Jane was teasing her now, no doubt for being a stick in the mud.

Even if Jane was capable of replying, she didn’t need to. The transformation spoke for her, as chestnut fur erupted from every inch of skin that had been tanned along their body. It felt much like being enveloped in a warm and soft blanket, one that clung to them tighter than skin.

“Nnh…” Sam patted behind herself, feeling for where Jane’s head should be. Instead, her palms met with the curve of her back, and the smooth transition between human form and equine body. Surprisingly, she sported a thick patch of fur where Jane’s hair had been. It was soft and lush, and would doubtless cushion a rider—

Ha! As if Sam would let someone ride her! Her ears twitched with irritation, and for the first time she’d realized they’d lengthened.

Meanwhile, Jane was having the time of her life. She could feel every inch of Sam’s body, even the parts that weren’t Jane’s to begin with. She felt the cute frown on her former boyfriend’s face, and reveled as the expression turned into one of shocked pleasure.

Jane knew why—she could feel it herself. Normally, a gender swap would simply be a shift of sexes, swapping Sam’s dick for the fairer feminine sex. In this case, however, their shared pussy was part Sam, part Jane.

Jane’s cheeks pushed through Sam’s body, breaking through to the other side and changing into the centaur’s new groin. Jane’s cheek tattoo now served as a tramp stamp, and her lips now ached and clenched as another set of lips entirely.

Surprisingly, that wasn’t even the best part of these changes. That honor had to go to their new fetlocks. Thick, cream-furred hair tickled all four of their ankles as it came in, a shaggy coat that provided pleasure simply by existing.

Sam moaned again, scuffing her hooves against the ground. She cupped her breasts in her hands, eyes widening at the feeling of cool metal around her left nipple. “No way… Seriously?” She looked down, and sure enough found a golden ring pierced through her chest.

She had little doubt in her mind that said ring was the reason why she and her girlfriend had turned into some sort of centaur. At the same time, she had no idea how she’d reverse the change.

Sam snorted, an instinctive and equine action. Her rear right hoof scuffed the ground, and she sent a baleful glare to her wide flank. “Jane, if this is permanent, then so help me…” She searched for a threat, one that would make Jane realize the gravity of her situation.

Unfortunately, trying to reason with Jane was a lot like trying to dry out the ocean. It took a lot of effort, much more time than it was worth, and at the end of the day would leave Sam wondering why she’d even bothered.

Then, inspiration struck. She reached up, adjusting her glasses. “I’m eating all of your granola bars,” she said, triumphantly.

That was a sour note for Jane. She flicked their tail in a panic, hoping that would convey her distress and definitely-probably-maybe sincere apology. Unfortunately, Sam was still frowning—Jane could tell by the expression on their face.

That meant it was time for drastic measures. She clenched their horse pussy needily, flicking their tail and sending as much of their scent as she could into the air.

Sam didn’t know what hit her. One second, she was glaring at where she’d imagined Jane should be. The next, all four of her knees were weak, and she found herself panting with need. Her slender fingers drifted towards the human pussy at the front of her body, and she found herself playing with what were once Jane’s lips.

“N-no fair… You can’t fight dirty like that…” Sam moaned huskily. She reached a hand up towards her breasts, pinching at her pierced nipple and letting out a small whinny-whimper of pleasure.

Little did she know, that wasn’t even the beginning of Jane’s dastardly plan. The former girl had much, much bigger things in store for the two of them, and those plans were rapidly coming to fruition.

A crash resounded through the underbrush, and a gorgeous centaur crashed into Sam and Jane’s campsite. The new arrival was a dirty-blonde with freckles that only highlighted his good-natured grin. He swept near where Jane was sitting with his eyes, eagerly trotting in place.

“Oh man, can’t wait, can’t wait! This is gonna be the best fun I’ve ever had! Just gotta find that horse ass and go to town!” He chirped.

Sam let him search for a moment more before loudly clearing her throat. “Uhm. Pretty sure it’s attached to the centaur. Centauress? I don’t know if there’s a better term for—”

He screamed. She screamed. They screamed.

Eventually, the male calmed down enough to look at Sam curiously. “Uh, sorry about that. I wasn’t expecting the change to… You know. Make a full centaur.”

“Oh? And what were you expecting? To change a hapless camper into centaur’s lower half, plow her, and be mare-illy on your way?” Sam folded her arms, quietly proud of her pun. Her butt jiggled as if to berate her, so she gave it a good smack.

“Okay, so. It sounds really bad when you put it like that,” the centaur lifted his hands, like he was calming a horse. “See, this usually goes well. Like, camper finds the ring, turns into a fun toy, then I bang them, change them back to normal, and they wake up better rested than they’ve ever been in their human life. Easy, right?”

“You make it sound like you’re doing the world a service,” Sam said flatly.

“Well, yeah. Haven’t you wondered how this place got such good reviews?” He scuffed his forehooves, embarrassed. Then, to Sam’s surprise, he extended a hand. “I’m Johnny, by the way. That’s my name. Like, what they call me. You know?”

“Yeah. We have names in human society, too.” Sam flicked an ear, irritated.

“And so, naturally, it would be polite to…” Johnny made a motion with his hands, as if expecting Sam to finish his sentence.

Jane realized that this impromptu date was rapidly heading south. Even though she had turned into their hindquarters, Sam was finding a way to be a real ass. There could only be one way to fix this, and that was by thinking of the lewdest thoughts possible.

“It would be polite to—” Sam began, fully intending to say ‘change us back.’ However, mid-sentence, the strongest wave of lust she’d felt in her life crashed against her. Both her pussies cried out with need, and her cheeks turned a shade of red typically seen on tomatoes. “Fuck me!”

“Come again?” The stallion blinked his gorgeous eyes blinking in confusion as his rippling bod caught the sunlight perfectly—pump the brakes.

Sam coughed, her cheeks flushed. Desperately, she tried to pretend like she hadn’t just considered getting plowed by Johnny, even if was rather attractive for a horse-man. “I mean. You could. Um. Is it hot in here, or is it just you? Me! I mean me!”

Her head spun. Why was it so hard to resist these kinds of urges when she was a girl? When Sam was a guy, she’d never have even dreamed of referring to a centaur as a ‘hunk’, let alone thinking about screwing him!

Inside their body, Jane chortled. She swished their tail a little harder, fanning more of their scent into the air and teasing their mare’s pussy at the same time. Sometimes, it was too easy. Just swap Sam’s gender, and she turned into a total slut.

“Are you sure you’re okay? Listen, I don’t know how you turned into a full centaur instead of just a fun toy, but I think there’s been some side effects…” Johnny trotted a little closer to Sam and Jane’s shared body. He lifted a hand to their forehead curiously, and that was the moment Sam struck.

She was horny. She was hornier than she’d ever been in her life. Having one pussy was bad enough, having to fight the new urge to be filled by something, anything. Having two? It was a miracle she’d made it this long.

Sam’s arms snaked around the centaur’s shoulders, and she pressed her lips firmly to his. She savored his muffled yelp of surprise, deepening their kiss and enjoying more of the taste of his wonderful mouth. A diet of lakeside fish and berries left him with a refreshingly healthy flavor, and it was one she needed more of.

Sam mashed her hips to his, pressing her human pussy against his warm-furred body. Absently, she noticed that he didn’t have a human set of genitals on the front of his body. Did she have two pussies because she was a female centaur, or was it because she was two separate merged humans? Either way, it gave her something to do with her hands while Johnny fucked her brains out.

“Mmph!” The centaur pulled back from her, blushing. “O-okay, hold up. I mean, we’re going kinda fast here, don’t you think?”

As he pulled away, Sam took note of just how ‘large’ he was. Her hindquarters ached with an empty need, and she licked her lips hungrily. “Johnny? Sweetheart? You were about to take me so hard that I blacked out when I was just a centaur’s lower half. Are you really going to puss out in the face of the real thing?”

Jane couldn’t laugh in her current state, so she did the next best thing: she beat their tail against the backs of their thighs. The reward for her mirth was a pair of fingers shoved into her front pussy, aggressively flexing her walls with a drive that made her dizzy.

“Quiet, you,” Sam muttered, before turning, exposing her dark and glistening cunt. “And as for you… Why don’t you shape up and act like a man?”

“W-what would you know about acting like a man?” Johnny blushed. Despite his hesitation, it was clear that he was as aroused as Sam was: the monster horse dong between his legs twitched and throbbed with transparent need.

Sam considered answering him honestly. Then she realized that her own life as one left her uniquely situated to blow his horse-man brain. “Nothing. But I know how to please one,” she giggled shyly. “So… Why don’t you mount me like the mare I am, and have the best cum of your life?”

Jane was barely aware of any of this. Ironically, enough of ‘herself’ was in their human pussy that Sam’s fingerfucking drove her near-senseless. That said, she wasn’t too far gone to feel Johnny’s muscled weight atop their broad back, his hooves around their flanks…

For a moment, just a moment, Sam allowed Jane a modicum of control over their entire body. The two women opened their shared mouth, crying out with a single voice, a single need. “Yes!”

Then Johnny thrust deep into them, and their world became one of insensate bliss, of pleasure beyond pleasure.

His stallion’s cock was thick to the point where it felt like Sam might break just from taking him into herself. She clenched her ample folds and wiggled her horse ass, savoring how snug a fit he was within her. “Ohhhghhodd fuck me!” She wailed, eyes rolling in her head.

Both her hands clamped down against her Jane-pussy, and she forced her other consciousness into her human love hole. Jane didn’t have a chance to brace herself. One second, she was enjoying being railed by a stallion, and the next second her everything was stuffed with Sam’s talented fingers.

“God, you love that, don’t you?” Sam cried out, though whether it was to Johnny or to Jane, she honestly couldn’t say. All she knew was that both her sexes were satisfied beyond her wildest dreams. She rocked back and forth, alternating driving her fingers into one cunt and Johnny into the other. She lived for the feeling of being stuffed so full she felt like an overgrown cocksleeve.

This, this, was what she needed. A devilish idea came over her, and Sam leaned back against Johnny, chuffing her lips and acting like a horse. It did the trick, and he started fucking her harder, rocking her so hard with his hips that she nearly fell over.

“More! More!” Sam begged. Johnny wasn’t one to disappoint. He grabbed her breasts, pinching them with his surprisingly soft fingers, tweaking her nipples and making her scream with exultant bliss. “NEEIIIGH YES HARDERREIIIGH!”

Sam was aware she wasn’t making much sense, just as she was aware that she didn’t give a damn. The only thing that mattered in her world was Johnny’s wonderful dick. She bucked her hips harder, faster, so full and so content with the world that she could… Could…

Johnny let out a nicker of his own, grunting and hilting himself into their body. He wrapped his muscular arms around Sam’s body, holding them as close together as possible before emptying himself into their womb.

Hot, thick seed flooded Sam’s sex. She’d thought she’d been full before, but this stuffed parts of her she didn’t even know existed. It found her at the edge of her breaking point, wrapped her in pleasure, and cast her into the abyss.

Sam’s mouth fell slack, tongue lolling out. She panted like the animal she was, whinnied for everything she was worth, and came. “UhhuhuhuhUHHEEEIIIGH!” Her mare’s pussy gripped Johnny’s cock tightly, her thick folds milking his cock for everything it was worth.

Jane came too, clenching her lips down hard on Sam’s fingers, holding onto them for all she was worth. She squirted into their palm, clenching and flexing until she was too sore to do anything but drip with satisfaction.

The two centaurs fell onto their sides, in an ungainly heap. Johnny didn’t seem to want to dismount Sam’s body, which was perfect. She wanted his warmth inside her, his arms around her, and his scent beside her as she drifted… off…

Sam’s eyes snapped open, in time to see a sunrise. Sam yawned loudly, then felt Johnny’s weight behind herself. Wait. Herself? She’d never been changed for more than a day, what happened?

“Um. Hey. Hey. Hey.” Sam poked the centaur behind her anxiously, her tail swishing. She felt Jane inside her stirring awake, a similar confusion drifting through her pussy.

“Mnnh?” Johnny cracked an eyelid, before leaning his head forward to kiss her. “Morning, sunshine…”

“Yes, that’s all sweet and cuddly, and thank you very much,” Sam blushed, a little giddy and embarrassed despite her concern, “but shouldn’t I be back to human now? I mean, wasn’t that the point of this all?”

Jane was just as confused. They were still wearing her anklet, and its restorative magic should have changed them back long ago. Spells weren’t supposed to stick on her for more than a few hours, unless…

“Uhm, I mean… Normally, yeah, but…” Johnny’s ears lowered to the sides of his head, in clear embarrassment. “You might be… A tiny… Teeny… Maybe bit pregnant. It’s just a few months! I swear! You’ll be back to normal in no time!”

“A few months?” Sam cried out, shifting her posture, only to feel his massive dick still stuffing her. Slowly, a heat began to build within her again, and the start of a rather evil idea bloomed in her heart. “Well… I think we can handle that. I’ve got some granola bars in the tent. What say we chow down on a few, then get ready for rounds two through eleven?”