Doc: https://docs.google.com/document/d/1JUmup9sWyRCgXDalLdH2jLebSvoSigmg0HrAXF1QFX8/edit?usp=sharing
//Wrote this while high and used an AI grammar checker, it is generally a mess but I’d rather keep writing it than go back and clean this up.

Digging through your medicine cabinet, you wouldn't exactly have long to find something to soothe the burning in your stomach before you'd lose your fingers.
It'd been a long time since you'd had Pon-E and maybe you'd left the little pill in the bottom of your cabinet much longer than you should have. A small collection of pills and a few things had been part of his parting gift before leaving to go join some hippie commune thing. You weren’t exactly aware of the details, but it was probably some weird pony cult thing. It had been a near-religious experience the last time you turned into a pony, and you'd been saving it for a special occasion. A particularly abysmal week at work and some bad news from your family left you with a certain need for escapism you hadn't felt in quite a while. 
The cost benefit of turning into a pony for a night of fun didn’t originally include being curled up on the bathroom floor naked as you cried in pain, though.
Transforming into a pony last time was a pretty pleasant experience, both tiring and refreshing as the changes flowed through your body. You currently feel like you are on fucking fire, itching at a growing pelt with melting fingers. That melting felt a little more literal than normal, the bones feeling like they were turning to liquid metal inside of your hand.  You kept itching with your stumpy fingers until your expanding nails began to painfully dig into your flesh. Your nails were spreading to cover them in a very different way than you'd experienced last time, your fingers organizing themselves symmetrically rather than being absorbed into your middle nail. Your hand was stretching like normal, but instead your thumb and pinkie were being pulled back into small, heel-looking protrusions that came out of the back of your forming... hoof.
>"A fucking... deer?"
Green hair grew to drape down over parts of your finalizing hooves, unnatural fetlocks racing ahead of the rest of your coat’s growth. The burning was slowly getting worse in your stomach, and you realized that you needed to get some help. You rapidly lost dexterity in your arms as you pulled yourself up, shoulders shifting as you stumbled out of the bathroom and back through your apartment.
Your cell phone was stuck on your bed, and the penalties for using Pon-E recreationally were a small fine compared to sorting out whatever the fuck was currently going on. You reached the bed with little time to spare, your spine giving you out and causing you to tumble forward. You pretty rapidly went from draped over the bed to dangling on the bed as you felt your body start losing mass, your shortened back legs kicking cute little hooves as the excess length of your legs was converted into a pair of very meaty thighs.
You let out a soft groan as you rolled onto your back, watching as your hips slowly swelled into a feminine curve, locking in place as your thighs swelled further into a pair of 'foalbearing' flanks.
>Huh- wasn't a girl last time
You reached down a hoof to play with your cock, feeling how it was proportionally larger on your body now. It certainly didn't feel like you were gonna lose your little buddy; the heat only building inside of him. A quick decision had you going for your ritualistic nightly masturbation, using both your hooves to sloppily grab a bottle of lube while you picked up a vape pen in your mouth. You messily coated your cock and hooves in lube before starting to gently stroke your hooves along your shaft.
As you began to jerk, you inhaled through the pen in your mouth, the smoke going cleanly into your lungs as you felt your barrel expand with a deep inhale, the exhale pushing your muzzle out gently and curving your head. Your hair was growing down your shoulders as it puffed up with another drag of the vape pen, looking even more expansive as your head had stayed disproportionately large for your body. The next puff came with more confidence as you rubbed your hooves along your changing cock, feeling it bulge and darken.
The burning inside felt good, the same as the gentle hug of fur that had come to cradle your body and the hair that spilled down your shoulders. As you rubbed and puffed, you felt a gentle swelling all along your genitals. Your cock was bulging as your balls began to properly swell into those of a horse. Your shifting hips had left your asshole exposed, and now it was twitching in the cold open air as it swelled out into a dark gray ponut. The heat coming from inside was actually enough to distract you from the rhythmic puffing and jerking.
With a soft groan through your nose, you rolled over, hooking open the drawer with a hoof and shuffling through the contents awkwardly as you maneuvered your new body. You'd discovered a few things about yourself, as last time you transformed, that being a pony was nice... and that pony you took to a party full of horney stallions like a champ. Normally, you have basically no attraction to people. Masturbation and sex were typically used to relieve daily frustrations rather than as a passionate act, but as a pony, you couldn't help but imagine being dominated, and this new pony-like form appeared to share that instinctual feeling.
At the bottom of the drawer, you found what you were looking for: a synthetic horse cock your roommate had given you along with the Pon-E. He was a cool dude, and right now you’d truly appreciate the gift he’d given you as you squeezed the bottle of lube messily above it. Letting gravity unevenly work to coat the horsecock, you’d smear as much lube as possible inside your ponut, one hoof rubbing along your cock as the other prodded inside of your new ponut, exploring the warmth within. However, you eventually reached the limits of your oddly shaped hoof, and your body craved much more. You’d whine softly as you'd pull your small hoof free and position the large artificial horse cock against your ponut. With a soft breath, you’d slowly push the silicon stallion inside of you, squirming at the feeling of your new ponut being stretched by the sizable head of the horsecock.
You got it in a few inches before repositioning onto your back, hooking the balls of the dildo with your back hooves and pulling it inside while you once more began to stroke your cock with one foreleg, the other reaching for your discarded vape pen and slipping it in your mouth. With a satisfying puff, you’d take a moment to appreciate the thick green horse cock between your legs, rubbing a hoof along the soft fuzz that covered your swollen green sack, but you’d let out a cute giggle when you’d brush up and tickle against a tuft of fuzz that had grown near the base of your balls.
Life was fucking good, you’d think as you stared up at the ceiling, the world brightening as your growing eyes started to take in more light and color. With another puff, you’d idly scratch at your growing chest fluff. A few more puffs and strokes, and you’d feel it start to grow into a more proper mane.
>Wow, I sure am a freak, huh.
You'd mumble your way around the pen, your hoof twirling through your growing hair. Feeling an odd prickly, itchy sensation on your muzzle, you’d cross your eyes to try and focus on the stubby. Actually- more of your body began to itch as the short body hair you’d possessed before the transformation began to fall out. The outer layer of skin started to rapidly change, replicate, and repattern itself into an unnaturally strong set of scales that covered your nose and back, reaching down until it tickled against your rump. You’d roll onto your belly, pulling yourself up to hump against a large pillow as you’d look back to examine the pattern of dragon-like scales that covered your back. You’d softly whistle as you raised your thick rump, letting the horsecock slip a few more inches out of you. Rubbing a hoof against the curved scales of your rump, you admired the subtle feminine curve it gave your body.
You’d grind your hips into the pillow as you massaged your hooves into your rump, feeling the contrast between the soft flesh and the flexible scales. Grinding your new horsecock into the pillow, you’d wiggle and reposition your hips so that you could lean back and let the silicon stallion slip back inside of your flexible body, clenching your insides around it as you slipped down. A rhythm would form between humping forward and slipping back into the horse cock, a sloppy and lackadaisical pace that had the toy nearly slip out several times as you casually huffed from the pen and grinded hard into the pillow.
The THC clouded your system and pushed the orgasm further from your reach. The dulling of your senses had left your head spinning quite badly. You barely noticed the subtle scraping noise coming from your head and the bulging on both ends of your body. A few flakes of scale began to snow from your head as you crossed your eyes, looking up.
>Unihorn?
You'd intoxicatedly mumble as you reached up to poke at your newly growing horn. You'd slowly sit up and flex your ass as you felt the tail begin to expand outwards, the flesh displacing the balls of the silicon stallion still inside you, causing a soft moan of discomfort. You'd reach down a hoof to readjust the toy and rub against your sensitive tail. A pony's tail was typically a short and stubby appendage, mostly hair, but your new tail slowly snaked downwards, encouraging you to pull it up towards your shaft so you could rub both it and your cock at the same time. Each jerk of your tail pulled the toy tight inside you, causing a pretty euphoric feeling as you shifted and it began to finally rub against your prostate.
With the flexing and bulging of your entire body, you could feel you were getting close. The muscles in your neck grew to support your head... as well as the bright red horn that was creeping into your peripheral vision. You could feel your flank begin to expand further as the soft plush gained firm muscle underneath, covering most of your legs and connecting up to your barrel. Your tail twitched as it was squeezed against your cock. The cock itself twitched in return as your strong pelvic muscles flexed. You took as big an inhale as possible from the vape pen as you felt the growing pressure in your cock, your balls beginning to contract slightly before letting out a burst of cum that painted the wall behind you, "Wow, what the fuck."
You weren't very swearative as a human, but words didn’t bounce around long in your new head before slipping out. You’d sit up in your bed, stretching and letting the toy slip out of you as casually as you’d lost all the worries. Pony instincts and the stabilization of your new tail helped you as you stumbled your way through the house, into the pantry to see what you had to make.