You pick the marble hoop from the myth box, you notice that the hoop is held by two golden horse head statuettes.
Wondering how this heavy and clumsy hoop would even be used, you take it out of it's box and leave it on the ground, you walk around it and step on it's center.
Stepping there gives you tingles and a bulging sensation in your muscles. Ignoring this, you then grab a hold of the hoola hoop with both of your hands, and with effort, you begin to lift it up until it's a little bit under knee height, but you're suddenly forced to stop by an intense barrage of sensations.
You're instantly overwhelmed by an intense bulging sensation, and fall to your knees. The room shakes, dust is raised and you hear stalls behind of you collapse and get shattered into oblivion.
Gasping at the sudden sensation and the shock of the earthquake and the destruction, you turn your head and almost scream at the sight; right past your knees you see HUGE, impressively muscular, bulging calves covered in perfect white fur, and the pitch black, impossibly heavy and sturdy hooves of a horse extending several feet away from you, covered by what you can tell are golden, exquisitely adorned golden footwear for your hooves, sunk in a crater left by their own weight, and surrounded by the debris of the shelves your new equine feet have just destroyed. You try to move them, but you only manage to swing your enormous hooves a bit, each one easily the size of the front of a bus, the calves are completely immobile by the incapability of your puny thighs to lift them up.
Bringing your view a bit forward you see the hoola hoop separating your still normal knees from the huge horse hooves, even with the enlarged size of the ring, the hooves and the calves look like they're squeezing out of the hoop, fighting for space and noticeably constricted.
You can't handle the feeling of tightness you feel in your calves, so you gather your strength, hold the hoop, and quickly slide them forward and up your body, all the way up to waist level before you're overwhelmed by the sensations once again.
You feel an explosive amount of force leaving your thighs and buttocks, and an almost burning, highly energetic feeling that abruptly stopped when you felt you hit something, followed by a chilling sensation in your ass.
You felt huge and bulging, you're still on your knees, shaking and immobile by the sensations, you felt stronger than ever, possessing a strength you've never felt before, looking behind yourself you're left speechless when you see what can only be described as a gargantuan, titanic mass of muscle and clear white fur that covers your whole vision. This is your ass. Your huge, round, muscular, plump, shaking equine ass.
Your flanks are the size of a large car, they're bulking, and even though you're still on your knees, they went right through the ceiling of the shop leaving the top of your butt in the cold outside and the sides of your flanks squeezed within the walls of the shop. The crater your hooves have previously left behind now occupies almost the entirety of the back of the shop, the concrete and tiles unable to support your tons of mass. Your tighs are huge pillars of pure muscle, perfect to hold your new weight. Your lower half is effectively the size of half this shop, which already looked huge to begin with. You bring your view to the hoop, awkwardly sitting on your lower back while the giant ass of a colossal horse is located in the other side.
You then feel something twitching in the middle of your ass, a bulging, thick, and sweaty mass that you're slowly gaining conscience of. Your anus. You have an enormous, thick, and gaping horse anus that could easily eat a whole elephant. It's gaping and closing in need, and it's driving you crazy, trying to make it stop, you shake your ass a bit, but you underestimate your size and your strength, and the whole shop, heck, the whole mall shaked and groaned under your weight. The sudden tremor made more ceiling pieces fall on your flank, and a piece of concrete and steel slides right onto your gaping anus, getting stuck thanks to the unbelievable suction power it's titan muscles gave it, and being instantly crushed into pieces by one of its twitches. You are overwhelmed by the pleasure this gave you, moaning loudly and shakimg your enormous ass making the whole shop to tremble. Between the debris, another feature comes to your senses, a huge, bright, shining golden tail that waves like a flag against the wind, a symbol of your majesty.
Recovering your senses after the intrusion your asshole just suffered, you notice something you haven't realized yet...
Your cock is nowhere to be seen.
You panic for a moment at the realization, and in the shock you lift your hind legs and stand up with your equine half, destroying another chunk of the ceiling in the process. You have a view of the whole town, looking far away at the distant buildings. After a while standing up this way, your equine legs start to tremble, despite their massive musculature and strength, they simply aren't made to stand upright, and you fall flat on your ass, causing an enormous earthquake that is felt through the entire city, and widening the crater you left moments ago.
You moan at the cushiony feel of your ass, despite it's heavy muscle mass, it still feels soft, almost like an immense dough, the fat and the muscle perfectly coexisting, giving you the roundest, firmest, and softest ass you can imagine.
On this sitting position, you take a better look at your massive legs, they extend so far away the tip of your hoove-shoes touches the other side of the shop, and your ass is so huge it lifts you all the way out of the ceiling, your ass alone was probably 10 feet tall.
You spread your legs and you get a clear view of it. A dark, thick-skinned, dripping fat mare pussy, it's dark skin contrasting your pearly white fur, and it's insides looking pink, soft and wet.
The realization that you're now a MARE send you into a slight heat frenzy, and you find yourself unconsciously lifting yourself up a bit to sink a piece of debris into your lips and rub on it.
You go on for a few minutes, closing your eyes and moaning to the sensations your enormous horse slit is giving you, before you feel a tight sensation deep within you, and feel a torrent of cum leave your lips. The piece of debris, the concrete and steel explodes into dust, and the room is flooded in your juices. Your lower body is shaking, and you fall to the side of your flanks, the ground shakes once again, and your fat ass and thighs wobble after the impact.
Panting and drooling, your pussy sending potent hormones to your brain, the sheer size of your new organs sending such an immense number of hormones your brain can't resist them. They force you to grab the hoola hoop and transform further.
You grab the ring and pull them up slowly. You can see your minuscule body expand enormously the moment it passes through the hoop, matching the fur, size and musculature of your rear, you kept going until you notice the bottom of two enormous bulges appear. Your horse tits. You kept dragging the hoop upwards, squeezing more of the perfect equine body you desperately need out. Two giant nipples emerge from the hoop, each one the size of your old body, you stretch and touch them with your puny human hands, squeezing them and stroking them. Your tits are full, round, fat and shining with white fur, contrasting with the rough, soft, warm dark skin of your nipples, you stroke them as if you were jacking off, and a small glob of golden, glowing milk is shot from your teat. Small for your size of course, as it hits the ground and floods the floor once more as if there were gallons concentrated in your glob of milk. It's scent is intoxicating and soon golden steam is raised from the ground. The steam tastes sweeter and creamier than anything you've ever experienced before.
You're lost in bliss, and you roll around with your huge mare legs and tits, you fail to notice the hoola hoop slide down your torso with this motion, expanding your body insanely fast. Your torso snakes out of the ceiling like a giant anaconda, stretching out dozens of feet into the sky, you get a sensation of vertigo when you stare down and see your giant barrel torso and stomach, chiseled with muscle and covered with soft, cuddly fat, stretch for what seems like miles down to your ass, wish looks like it's grown even bigger, now covering almost the entirety of the shop.
The hoola hoop has stopped right at your armpits, your equine body squeezing painfully through the other end, while your remaining human side is awkwardly sitting on top of your sea of white fur hundreds of times wider than you are. You grab a hold of the ring and carefully slide one of your arms down the hoop, trying not to fall in it and finishing your transformation instantly. You want to experience this slowly. Your hand comes through the other side as an insanely huge hoof, adorned with another beautiful golden shoe, just like your hind legs, you stretch your arm further down, a absolutely massive horse front leg coming out of the ring. It's filled with muscle and soft fat, giving it a bulky appearance like the rest of your body, it's white fur shining brightly against the sun, and making the outside coldness seem like nothing.
You're unable to take the feeling of constriction the hoop gives you, and you feel the urge to squeeze your goddess body out of the ring instantly. You need it. You quickly position the hoop, and dive your head and remaining arm into the ring. You feel dizziness at first, and then a warm sensation, and then bliss. You are complete. You are a goddess.
You open your eyes, gorgeous eyelashes protecting your beautiful golden colored orbs, shining golden like the sun, your mane is waving against he wind majestically, shining just like your eyes, and you take a loud breath with your enormous muzzle, you feel your lungs fill at full capacity, you feel better than ever, full of energy and power. You quickly raise your hind legs, standing in the quadruped stance your body was made for and easily reaching 300ft at shoulder level. Your powerful legs and ass lifting with ease. Your ass alone is so huge it now takes half of the mall, and you proudly get rid of the debris and remains stuck in your cushiony ass with your tail. You stand proudly and scratch the ground with one of your front hooves, leaving a scar on the ground the size of a house. You raise your head to the sky, lift your front legs and stand on your hind legs, striking a powerful pose. You leave out a low, loud, powerful neigh from your muzzle and neck that makes the world rumble beneath you.
You are stronger than anything humanity could ever hope to create, you're power. You are unstoppable. You are a goddess. The strongest being to have ever existed.
You fall back on the ground, causing a massive earthquake. Possibly the strongest one ever recorded, and the entirety of the mall and the buildings surrounding you collapse under your mass and it's shockwaves. You neigh once more, and start trotting towards the city. Buildings and streets are removed almost instantly, your powerful hooves passing through them like they're dust, your massive hooves leaving deep craters the size of whole buildings throughout the land. The structures of man are no rival to you.
Your eyes, mane and tail shine bright, brighter than any light conceivable. You are the horse that pulls the sun, depicted and venerated in so many cultures throughout so many years, and now you're back to shine the world once more.