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Mike blinked back tears as he stormed out of the gym, the vicious mocking laughter cut off behind him as the door closed on the thin cheetah. He had gone in to gain weight, but from the start of his first day felt the mocking looks of the other patrons.

It was bad enough that he stood out so much among the muscled jocks of the gym, but the remarks about twigs being broken and cheetahs ought to know their place finally made him snap.

It was the wrong move as several of the beefy patrons decided to compare their body to Mike's, mocking the small cheetah the entire time before telling him to scram. The attendant only smirked at him as Mike stormed out the door, and the cheetahs anger quickly faded to shame and disappointment. His walk back to his apartment was slow, the sky turning red and orange as the sun began to set, the purples of night starting to appear as the cheetah finally got home.

Stepping into his apartment, Mike sighed. He managed to afford a one bedroom apartment by himself between his college scholarships and his tutoring job, but not much on the way of entertainment or furniture, a small beat up couch and a tall mirror in the living room, a table and single chair in the dining room, his bed and desk in the bedroom. A small sad place for a small sad cheetah, Mike thought to himself as he flung himself into his desk chair and limply sat as he checked his email.

Mike's eyes perked up at a bit of good news as he saw his quarterly college grades posted, all straight As. The cat maybe wasn't the biggest feline, but he was plenty smart.

Mike stretched a little and was about to kick off his shoes before hearing a knocking on the door. Confused at who would be visiting at this hour, the cheetah got up and walked over. Seeing nobody through the peephole, Mike looked around and finally down to see a small brown cardboard box on his doorstep.

Mike picked it up and looked around confused, there was nobody around and the box didn't even have a proper label on it, just a "For Mike" on it. Puzzled, the cheetah closed the door and went back inside, opening the box in his living room and finding... A black baseball cap with the word "Chuff" written on it, and a note.

Mike took the note in paw and read, "You could use some confidence, so I got you the hat. -an admirer." Mike set down the note and box and turned the hat over in his hands, looking at it. It looked like a normal hat, and the cheetah wondered who his admirer could be. Chuckling to himself, Mike put on the hat and checked himself in the mirror. It did look good on him, he admitted, and did some silly muscle poses that looked out of place on his thin body.

Feeling slightly better somehow, Mike went to take off the hat when suddenly his body felt flush, his head spun, and thoughts became sluggish.

"What's... Happening" the cheetah barely managed to get out before his body lost balance and he fell backwards on to his couch, his mind feeling like it was encased in muck while his body began to pulse.

Each pulse of the cheetah's body flexed his muscles, growing warm and hot as a dull ache grew within them, eventually becoming a sharp soreness. Mike let out a small high-pitched mewl as the pain became too intense, but then suddenly the pain was replaced with pleasure as the cheetah's body flooded with endorphins and the cat leaned back into the couch.

All over the felines body, his clothing grew slightly tighter, fabric pulling wrinkles smooth as his body grew. The hem of his pants pulled upward and exposed more of his lower leg, and his shirt untucked as his torso lengthened, the cheetah growing taller inch by inch. Mike could only mewl in a pleasured confusion as he felt his body change, the sensation of his weight increasing, of sinking further into the couch even as his vision raised up higher from his stretching torso.

His t-shirt pulled tight against his swelling upper body, the hem above his thickening six-pack belly. The sleeves strained, then ripped under the pressure of Mike's upper arms swelling to nearly 22 inches.

The cat groaned as his shoes began to pinch, but between his muddled head and tight clothing, he could only sit as he felt his feet stretch out his shoes, toes becoming cramped as his sneakers became too small. His mewls became somewhat strained along with the material of his shoes, the shape of his growing feet warping the material and giving it a contour.

The cheetah's neck thickened as he let out a deep rumbling mew of pleasure as his size 8 shoes finally burst, toes wiggling as his paws continued to swell larger, to a size 13, remnants of his smaller shoes finally falling off his ankles.

With a groan, the stretched fabric of Mike's pants that had been cutting into his swelling thighs and hamstrings burst at the seams. The seat of his pants gave way as his rump swelled with muscle, tearing both his pants and underwear.

Mike took a deep breath, his mind feeling a dumb satisfaction as his shoulders popped and widened, the expansion of his torso finally causing his tight t-shirt to tear apart, exposing the well defined muscles that rippled under his spotted coat.

His mind still spinning and the feeling of fireworks in his head, the now muscular cheetah got up from his couch, the last of his pants falling off his crotch and catching on his swollen calves. With a deep grunt, the cheetah pulled them off, ripping the fabric and tossing the ruined pants across the room, before posing in front of his mirror naked except for his snapback.

As the pleasure began to fade from his body, Mike's mind returned and was shocked and surprised at how heavy and big he felt, a growing part of him reveling in every movement. Soon the cheetah was posing again, showing his rippling thick body to himself. Memories began to fade and rewrite as his paws explored his body, the feline's mind growing simpler and being rewritten as Mike chuffed deeply in joy and pleasure from every flex and pose.

Memories of studying and doing well in school were washed away, replaced by vague ones of working out constantly and poor grades. Shy awkward moments were swept away and transformed into moments of confidence and being self assured. Trivia on comics and games were swapped with sports, and his proud memory of accepting his full ride academics scholarship shifted to partying after being accepted on an athletics one.

Still, the new memories were hazy even as the old ones were fading, and a bit of Mike held on, devolved as it was. Vague panic at the changes he was undergoing ran through him, and Mike managed to tear himself away from his growing narcissism and the mirror to get to his computer to get help. A bit more of him slipped as he felt pure joy from having to navigate his larger form down the narrow hallway and turn sideways to get into his room, and he flung himself into his computer chair.

The chair creaked dangerously from the heavy load on it, sending a thrill of pleasure and satisfaction through the cheetah that Mike couldn't quite clamp down on, loaded up his browser to get help, but found himself instead at a porn site he knew well, filled with muscular people like how he now was.

Instead of changing to a new site, Mike began to browse the videos, an erotic feeling mixing with his joy of being so huge, with a growing tingling sensation in his crotch. Mike felt his balls begin to churn with a warm feeling as his sack first tightened, then stretched as his gonads swelled to the size of apples. Mike rubbed his larger balls to relieve the ache he felt, then clicked a new button and saw a recording screen, and the light of his webcam turned on. He was now broadcasting, and the thought of being watched fed his ego and made his cock jump up.

Tweaking a nipple with one paw as he gently stroked his small member, the muscular cheetah huffed deeply as he felt pleasure build up. The last bit of the old Mike halfheartedly tried to resist but was pushed down, packed inside his churning gonads.

The barbed cock began to swell as more people logged on to Mike's stream to see the stud cheetah fap. The feline snarled as the pressure built in his penis, feeling it strain and stretch as it spasmed, growing one inch, then another, becoming thicker as it grew. Mike panted as he continued to pleasure his swelling cock, seeing the numbers of people on his stream grow larger along with his junk. Eventually his cock had grown to the point he needed both paws to pleasure himself, pre drooling from his tip onto his belly. His growing cock left a visible trail of seed as it stretched longer and thicker, the growth only stopping at his top row of abs.

Pleasure shuddered through the cheetah, his cock fountaining pre and making his member slick. His jaw fell open and tongue hung out as it stretched and reshaped, growing thicker and wider, Mikes face reshaping from a cute kid to a masculine stud. His chest rose and fell as he panted, his grunts becoming deeper. Tufts of fur on his chest and under his armpits grew thicker and more wiry as more testosterone flooded the growing cheetah's body.

With one last stroke, Mike nearly roared with pleasure as his cock spasmed and shot over his thick chest and torso. With every jet his old life faded, his wit and memories weakening and vanishing. By the time the giant barbed cock finally gave it's last spurt of seed, there was nothing left of the old Mike, only a dumb studly jock of a cheetah.

Mike looked at the camera, showboating a little as he lazily ran a paw around the contours of his muscular chest. The cheetah then demonstrated that as big as he was, he was still limber, letting out chirrups of pleasure as he began grooming himself, thick tongue lapping up the seed from his body. Mike even deepthroated his own cock, always slow to shrink back down, to get it clean.

Eventually the cheetah finished and smirked at his webcam before signing off and checking his take - more than enough so he could quit his stupid job and focus on himself, and get some better cameras.

Sure, Mike wasn't the mentally fastest cheetah, but as he kissed his own biceps, he thought that he'd prefer it this way.