My Beautiful Dark Twisted Fantasy

Flutterstrong trotted on, savoring the foul air she spread as she went. Behind her, a mare cried out as her physique rebelled against her. Above, a pegasus began to swell not with fat, but with gas, and screamed in pain and panic as a fart propelled him further from the ground.

She noticed none of this, of course, living happily in her own little world of flatulence and muscle. Even when the wind changed and gas was propelled onto the fleeing ponies in front of her, she paid them no mind. For she was Flutterstrong, and a little pony turning into an immobile ball of flab was normal in her magic-addled mind.

Applejack was used to strange events. She lived in Ponyville, after all, and with her position as the element of honesty, she was usually at the center of them. But when Fluttershy walked through the gate to Sweet Apple Acres, even she had to double take. Here was her friend, tiny, pathetic little Fluttershy, jiggling with fat yet clearly stronger than most stallions she knew!

"Fluttershy? Th' hay happened t' you?" She asked, incredulous at her friend's size, "Twi cast some sort o' strength spell on ya?"
Flutterstrong didn't reply; Applejack was talking nonsense to her, and she responded in the only way she knew how. By burping.

Once again, magic began to take place, invading Applejack's every pore and causing her insides to churn painfully. She groaned and placed a hoof on her belly as it began to swell like so many others had done. She couldn't even utter a word as her entire body began to tingle. Her fur and mane began to grow longer and more unkempt, and black spots formed across her bloating body. She moaned as her breasts began to gurgle, suddenly seeming fuller than ever before. They quivered and shook as they began to bloat outwards, pressing tightly between her thighs. No matter how wide she opened her legs, her tits were just too big!

With a yelp, fell backwards onto Fluttershy, the muscular pegasus quivering, but ultimately collapsing beneath her heavy friend. Applejack's hips felt on fire as they stretched out, giving her a backside perfect for bearing foals. Her hooves cracked and snapped as they became cloven. She could barely think as she pressed a hoof against her swelling crotchtits. Another moan escaped her lips, this time sounding a lot deeper, with a clear -oo sound at the end.

The next time, it was definitely a moo. Milk began to drip from AJ's breasts, and she swished her tail in pleasure at the relief. Down below, Flutterstrong could barely comprehend what was happening. Since when was Applejack a cow? And more importantly, since when was she, the strongest of her friends, pressed into her blubbery buttcheeks? Applejack farted, letting off a satisfied moo, and Flutterstrong began to feel woozy, both from the lack of oxygen and the swirling magic of Applejack's fart. She wasn't a seat, was she? Sure she was. Flutterstrong's short existence ended, and in her place was a new pony.

Flutterseat!