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How to Become a Centaur Commissioned by Amberhoof Based on art by AgroPuer

Spring was a many splendored thing, bringing with it the feeling of great change and great promise. The long winter was behind, the bright and sunny days ahead, and each day was a day of discovery. For Thomas, the view on the way home was almost too good to be true; the flowers were blooming, the trees were swaying in a gentle breeze, and the sky had no clouds. It helped that he had avoided a common winter problem with regular visits to the gym.

While Thomas was an average height for a young man, he'd maintained excellent physical condition even through the holidays. His pecs were toned, his shoulders were shapely, and his arms had the mounds and curves of a sublime waterfall frozen in time. His dusty blond hair added to his mystique, shaved short on the sides and worked into a thick crest of a mohawk down the center. It spiked up in a thick plume with just a hint of a curve at the peak.

Thomas moved up the sidewalk toward his house, feeling his grey tank top rubbing back and forth over his pierced nipples. Even a year later, he was surprised how much constant stimulation the bars managed, the little ball shaped tips resting on either side of each nipple. He smiled broadly, feeling the sun kissing the back of his shoulders as he approached the house, although he slowed, spotting something unusual.

Sitting on the front porch, slightly banged up on one side, was a large cardboard box. It was emblazoned with a big black swoosh with an arrow in a tight, horseshoe shaped U with packing stickers plastered on one side. The box was nearly the size of Thomas' couch. He moved up to his porch and crouched down, grabbing the box with one hand on the corner and one on the side. Despite its volume, he was able to pivot it around to see the product detail on the back.

"Centaur Magic Costume?" Thomas murmured to himself, his dark eyebrow arching quizzically. He glanced around, then back at the box, checking the shipping information. Sure enough, it had been sent to him. Still, there was only so much he could learn outside. He made short work of unlocking the front door, throwing it as wide as he could get it before lugging the box inside.

**** The shriek of the packing tape being broken echoed off the cream colored walls of the house, and as the box flaps peeled up, a sea of pinkish white packing peanuts poured from the contents, spilling across the avocado green rug in the center of the room. Thomas knew it'd be mildly irritating to clean up, but at least the mystery was making up for the inconvenience. His hands plunged down into the box, fished around, and found something that felt... squishy? Leathery? Something slick like a short fur hide?

Thomas grabbed on with one hand, his other powerful arm plunging in. He got a good grip and tugged. More peanuts spilled, but the rumbling sea of foam parted as an immense, rubbery form slipped out from beneath into the light of day. It was awkward, gangly, and bigger than it looked. The mottled form was ashen gray, lighter on one side and singed darker on the back. The more the young man pulled, the more emerged from the box.

A limp leg swung free, the gray fur graduating to a floof of black at the tip, nearly obscuring the grey hoof. Another leg came soon after, then more of a strain. Thomas grunted as he withdrew more, apparently an underside with a heavy pocket hanging down from it. More legs, a heavy backside, a long sand colored tail, and as the last of the packing peanuts fell away, Thomas grunted, clearing the large mass from the box only to drop it down onto the carpet in front of himself.

He panted a bit, surprised he had been able to get the box into the house. Maybe having it boxed up made it less awkward... Though looking at the thing, that seemed impossible now. Laying on the carpet was a fur coated, rubbery leathery mass that looked like the bottom half of a horse. The detailing was incredible, the padding shaped just right, the hair so perfect. Thomas blinked a few times in disbelief.

"What is this?" he murmured, circling around the carpet. The blinds had been drawn, but the sunlight pierced through, casting long bands of light across the carpet. The light glittered in a vase near the window with preserved palm fronds. Thomas' eyes surveyed his living space as he contemplated, but they paused as they spotted the pile of mail sitting on the floor where they had been unceremoniously slid through the mail slot. In the midst of the pile was a peach-colored orange envelope with red edges. Thomas moved over and picked up the envelope, running a nail under the edge. The paper gave way with some resistance and he withdrew a soft rose colored letter from inside. The black typeface contrasted starkly with the light pink background.

"Thomas Ambrose, you have been invited to the Hollbrook Mystic Society Spring Banquet. This year's theme is embracing the magic of nature. As a patron of our website, you have been selected to try our newest costume alternative." Thomas stopped reading, realizing he had tried a few HMS costumes in the past... and then he'd seen something similar to this costume on their website. Had he really been rewarded just for visiting their site? "If you choose to attend, try on our newest centaur costume and feel the power of the horse. Sincerely, the Hollbrook Mystic Society council."

Thomas stood there, looking at the letter. It was all rather fancy... Custom envelopes, custom letterhead, invitations and banquets and now a free costume. Part of Thomas wanted to be suspicious, to wonder why they'd go through so much trouble for him, but the costume was too amazing, too exciting. He looked at the equine body there, limp and loose, begging for an occupant. He set the letter down, kicked off his shoes, dropped his shorts and peeled off his tank top.

His clothes landed in an unceremonious pile in the corner of the room, leaving him in just his black boxers. Thomas circled around the costume a few times, trying to figure out the best way to go about it. Well, if it was a horse, he'd ride it from its back, right? Thomas stepped over it, coming up over the backside, finding the loose sleeve like front part. Yes, that had to be the point of entrance!

Left foot down, Thomas grabbed the edge of the costume and began pulling. The rubbery, leathery hide stretched beneath his fingers, and the costume started to hike up higher. His left foot found a sleeve like hole and began squeezing down into the costume's front leg. He felt it cling to his leg, hugging, encasing it tight. His foot slipped down until it settled down into the hoofspace. It was a little cramped on the toes, but it held alright.

With one leg in, Thomas swung his right leg over and down into the sleeve and started to pull the costume up around himself. His heart was racing. There was something thrilling about this costume. It was so big! If it worked right, he'd be the talk of the town. His blood was pumping, his ears feeling hot - but it was more than just the blood. A tingling spread through his ears, the tips slowly inching into points, changing ever so subtly as he got dressed.

Thomas thought to himself how lucky he was that the front right leg seemed to flop at the same angle his right was bent at, making it easier to align. Inch by inch, he pulled the costume up, feeling it cup his ass as his right leg sank down. The rubbery inside came up between his legs, cupping his groin. With his body inserted so fully, it was getting harder and harder to maneuver as he brought the rip up over his hips, letting it snap against his waist - just as the seam disappeared.

A warm, wet, slick feeling surrounded his mid-section... numb, strange, confusing. He no longer felt his boxers... nor anything quite like he had before. Confused, Thomas reached down to grab at the costume to peel it back and look, but his fingers could find no seam, no line, no gap or edge. Thomas' heart raced even faster. He reached down to try and pull the fabric on his costume's thigh, to get it to let go of his leg, but as he did, he felt the pinch of his fingers on his... hide?

Thomas reached behind him, grabbing at the back of the costume, feeling his fingers there as well. Fear turned into panic. Thomas went to take a step, but his hind horse leg raised as well, pushing up, ready to run. Thomas stood there wide eyed on four wobbly legs. He took two steps, then two more. His hooves settled down onto the carpet, he could feel the air blast his bare torso and course across his fur. He circled - not easy to do with his enhanced size.

"Oh my god..." Thomas whispered, moving down the hallway, squeezing his horse's ass between the walls. He knew he couldn't make it into the bathroom at this point, but the mirror would be visible. He shoved the door open and peered inside, his jaw dropping. He was taller now, at least seven feet. His sandy colored mohawk stood as tall and proud as ever, and an equally sandy colored tail flicked nervously behind his meaty hindquarters.

Thomas spotted his pointed ears, his grey horse's lower body, and... it was handsome. He realized his left feed went from grey to black with grey hooves, and his right feed went from grey to lighter grey with black hooves. The asymmetry was rather pleasant, and seeing the movement of his huge muscles, his fine upper body, his... animal magnetism, it was all a bit much. He gasped suddenly, feeling something hot, wet and slick move beneath his hind legs.

The thick, black sheathe that had been so dutifully protecting his most powerful asset had relaxed, allowing several inches of thick, hard horse meat to emerge. The long shaft led up to a puffy, large, blunt equine head with rippled edges and a wide urethra. The shaft was mostly jet black like his sheathe and balls, but had a pink mottling reminiscent of his original skin tone. The cock wobbled beneath his legs, easily several times larger than he had ever managed to get his human cock to grow to.

Hormones raced through Thomas' mind. His lungs heaved, his heart thumped, and his cock pulsed... It was ready to be used, eager, willing, able - but how? How did centaurs masturbate? Thomas grunted, his eyes fuzzy with his growing horniness. He left the bathroom behind and managed to squeeze into his bedroom. At least that door was a bit wider, and the room itself more accommodating.

Being at the back of the house, the bedroom was surprisingly large. In addition to the windows on the side wall, skylights angled upwards on the roof allowed the afternoon's glow to spill out across the queen sized bed and the crisp white linens that covered it. Thomas grabbed at his pillows, placing them down the center of the bed before he got lined up at the foot of it. He certainly couldn't reach his hind quarters, he just hoped this would work.

The centaur crawled up onto the foot of his bed, laying down on his front legs so his human navel was just above the mountain of pillows he had created. With his hind legs lined up, he began pushing forward, finding that spot above the mattress and below the pillows to push into. With his own weight pushing down on them, the pillows formed just the right sleeve for his cock to penetrate.

Feeling a vague semblance of sex, Thomas thrust forward. His blunt equine cock dragged against the pillows, creating friction and heat. He held, pulled back and thrust again. It took a few moves to get used to it, his front legs twitching and trying to move as he flexed his back legs, but as he settled in, he really started to get a good rhythm going. The bed lurched and grunted with the impacts, the centaur only picking up.

Sweat glistened across Thomas' chest, his eyes squeezed shut in lust. One arm slipped up, a hand gliding across his mohawk, brushing his pointed ear. His pit glistened as well in the rays, releasing his manly musk as he fucked his bed. Thomas' other hand moved across his chest, finding his pierced nipple to pinch, to twist, to play with as he went to town.

The friction built and so did the heat, the huge cock getting bigger. Thomas moaned, grabbing onto both nipples, assaulting them as he fucked his bed, going full force. Plaster chipped from the wall where the bed rammed into it, his hooves were tearing into the carpet, but he didn't care. He was a beast, an animal, a man, a centaur! He threw his head back and howled as he felt the most unforgettable orgasm of his life rip through a body much larger than he had ever had before.

The grapefruit sized balls tugged up, the immense cock pulsed and throbbed, the urethra spread wide and thick ropes of thick horse spunk shot out, pumping quart after quart of sperm into the piles of pillows strewn across his beg. Each thrust only forced the cum out in every direction, squirting from the edges of the pillows, dribbling back down along his cock, and leaking in a thick puddle into the center of his mattress.

Thomas moaned with each thrust, though he was slowly losing steam. His thrusts stopped, his orgasm stopped, and his breathing nearly stopped for a moment before he gasped again. His head drooped, chin against chest as he let his feelings sort themselves out slowly. As everything started to come back to him, he realized he hadn't checked for instructions in the box. Thomas shook his head, trying to clear out the cobwebs as he stood back up onto all fours, squeezed out of his bedroom, and headed down the hall.

It was amazing how different the living room looked from his new perspective, but his eyes shot right back to the box in the middle of the carpet by his couch. He had to crouch down to grab onto the box and turn it, studying the details. The shipping details made sense, coming from the HMS and addressed to him. There was the curved horseshoe symbol, the side of the box with the product details - and a warning near the bottom edge...

"Permanent Change..." he whispered, the words leaving his lips heavier than he had spoken them. He stared at the warning, realizing how foolish he had been to rush into this - and yet, at the same time, his huge horse cock was still swaying between his hind legs, slapping his belly. He felt AMAZING, he felt beyond amazing. He was something new, something wonderful, but his name just didn't seem to cut it anymore. Thomas Ambrose was a name for a human, not a centaur. No, he needed something grander.

"Amber... hoof. Yeah, that'll work..." Amber grinned, feeling his confidence returning to him. He took another breath and looked around his apartment, trying to figure out how he was going to clean everything up. The packing peanuts were going to be a lot bigger challenge on four legs, but maybe that wasn't the issue to worry about at the moment. After all, he HAD been invited to the Hollbrook Mystic Society's Spring Banquet. He had a brand new body to show off to a brand new group of people. Life was going to be very interesting.