Title:           fat kinkydash
Author:          Anonymous
Pastebin link:   http://pastebin.com/GFhZNCQh
First Edit:      Friday 22nd of April 2016 12:13:00 PM CDT
Last Edit:       Friday 22nd of April 2016 12:13:00 PM CDT

>You breathed in the midday air, savoring it. Your heart was pounding in anticipation for what was to come, and it took all your self control not to beg her to start straight away.
>You sat on a bench in the middle of Ponyville park, your marefriend Rainbow Dash sitting next to you, looking as svelte and lithe and sexy as always. She shot you a grin, one of those you'd come to learn was meant to hide her nervousness. No one but you probably would've caught that
>You'd been dating for going on six months, and it'd been a great ride so far. Along with all the warm fuzzy stuff, Rainbow had proven to be a much kinkier mare than you'd ever imagined.
>Bondage, exhibitionism, voyeurism, and many more. You'd tried them all with her, a lot of them at her insistence, and with magic added to it all, the sheer scope of what you could do was so much greater than on Earth.
>She was a pocket rocket, that was for sure, but there was one kink of yours you'd only admitted about a week ago.
>It'd been awkward at first, but she'd accepted your admission that you found fat mares sexy with the casualness as she had all the other kinks you'd suggested.
>The topic hadn't come up again, and with some regret you'd delegated it to the one thing the two of you would never try.
>So, it'd came as quite the surprise when on one of your daily walks, she'd pulled you onto the bench you now sat on, and pushed a wrapped box into your hands.
>Curiously, you'd pulled it open, and gasped as you instantly recognized what it was.
>In the time you'd lived in Equestria, you'd subscribed yourself to a number of the kinkiest magazines available. One of those, Big Mares Monthly, had had a whole issue dedicated to what you were now looking down at.
 
>It was a silk choker, from which a single emerald hung from. It would've suited Dash perfectly, if she ever actually wore jewelry when not taking part in one of the kinky escapades you both enjoyed so much.
>But that wasn't the point. The thing was magical, one of the most powerful new artifacts available for purchase. 'Make any mare your dream fatty', the tagline had boasted, and from the photos they'd shown, they weren't lying.
>Inside that emerald was a transformation spell, one that would fatten any mare who wore it to morbid obesity. Not just that, it promised all the hallmarks of fatness; sweatiness, poor health, extreme appetite. As long as they wore it, they'd be fat. To make it even better the gem had reality warping magics woven into it. No one but the wearer, and the person who put it on them, would know the newly fattened mare hadn't been big her entire life.
>There was a scrap of paper in the bottom of the box, which you picked up with trembling fingers.
>'One whole week' it said, the 'whole' underlined several times. 'A gift for special human'.
>"You're serious about this?" you asked Rainbow, voice a mix of excitement and awe. "But I thought you hated the idea."
>She smiled back at you, punching your arm. "Oh come on dude, this is me you're talking to. Need I remind you about the gender change and the whipped cream. I'm the queen of kink, and what kind of royal would I be if I didn't indulge your deepest, darkest desires, just like you did mine."
>"B-but you won't be able to fly, or practice or--"
>You were silenced by a hoof pressed against your lips. "Now dude, don't go and talk me out of it now. Sure I might not love it, but we'll have fun, and then after a week I'm back to normal again with nopony the wiser. Oh, but you're doing all the work though. I ain't cooking, or cleaning, or doing anything else. Oh, and no teasing about my naps anymore."
>You chuckled. "Are you sure this isn't your fantasy?"
>"Oh shut up," she replied.
 
>She hopped off the bench, and stuck out her neck. "Now put that damn thing on before I come to my senses and realize how crazy I'm being."
>Not wanting that at all, you quickly pulled out the magic choker, and slid it on her, so excited your fingers barely co-operated.
 
>The choker had a tiny little clasp at the back, and that you couldn't help but think would be all but impossible to undo for someone with big, clumsy hooves.
>The realization hit just then that Rainbow wouldn't be able to back out, at least without your help. Well, it seemed like she'd be fulfilling her promise of a full week if she liked it or not.
>There was a brief fizz, and a pop, the emerald glowing a luminescent green, before it all faded away.
>Cracking open an eye, Rainbow looked down at it in surprise, and maybe a hint of relief in her eyes. You couldn't have been sure about that last part.
>"Huh, that's weird," she said, "maybe it's... Whoa!"
>Just then the spell kicked into action, and you leaned back on the bench, drinking in every tiny detail with glee.
>It was her rump that happened first, and you pushed her hip a little to re orientate her, giving you the perfect view. It grew larger in little surges, more and more flab added to it every second. Soon it'd become bubbly, then chubby, before finally crossing the boundary into full on fat territory. Even then it still kept going, not stopping until it'd achieved of the biggest rump you'd ever seen. It was huge, and complimented by chunky thighs that touched all the way down to the knee. She wouldn't be going anything faster than a waddle for the next week thanks to that behind.
>From there her belly started to get in on the action, surging downwards like it was a big drop of water. It quickly began to brush against her thighs, and wobbled faintly with each breath. It stopped only when it was about an inch above the ground.
>Rainbow's back also developed a layer of pudge, forming all kinds of rolls and folds. Your favorite part was the rolls that formed above her hips, that eventually merged to form part of her belly. They'd be great hand holds for when things got naughtier at night. Even her wings received a tiny coating of pudgy. It wasn't much, but it was just enough to render them useless.
 
>Finally the rest of her filled out. Her front legs grew fat, and her chest puffed out. Her neck too got fatter, stretching the choker taut around it, even making it sink in a little, partially hiding it. The best part was when a second chin formed under her old one, and her cheeks and lips puffed out.
>Gone was the old Rainbow, the perfect sportsmare, and in her place was a total fatass, one that didn't even know the meaning of the word 'exercise'.
>There was one final flash, and as your realized what it was, you dick went from hard, to diamond cutting. Rainbow's cutie mark, her signature cloud with lightening bolt, it'd changed. In its place was a cake, three layers colored the same red, yellow and blue as her old cutie mark. To top it off a generous portion of white icing was on the top, replacing the cloud.
>Rainbow gasped in shock, newly fattened legs buckling and shaking under the new strain. Unknown to her the gem had also leached her strength and degraded her muscles. It'd be a struggle getting anywhere now.
>Not able to stand it anymore, she sat down on her new butt, grunting as she felt it spread out under her.
>She felt huge, immense, a total blob of a pony. She was easily the biggest mare she'd ever seen, and she hadn't even seen herself in a mirror yet.
>Moaning to yourself, you traced a hand down Rainbow's back, pausing every once and a while to grope a fold, or jiggle a roll. Finally you reached her new cutie mark, and against your better judgement you gave it a quick slap, moaning as the rippling spread to almost her entire body.
>"So, what now?" Rainbow asked, trying not to touch any of her new body. She'd already regretted it, but she was too proud to back down.