A small, four foot tall, purple horse (affectionately known as a pony) stared up with menacing eyes at a massive, centaur monster towering over her pitiful form. A far more visually appealing battle took place between two individuals a few seconds ago, the battle had many explosions, lasers and other awesome things.
"It appears we are at an impasse. How about a trade, Princess Twilight? Their release for all the Alicorn magic in Equestria." said he that is designated Tirek.
The purple horse known as Princess Twilight Sparkle gasped in horror. Some other ponies gasped in horror too, but they weren't really important since they all were trapped in magic bubbles. Although, there was some odd pony with the head of a pony and a body of all sorts of other things.
A long pause ensued.
Twilight took a deep breath before speaking."I will give you my magic, in ex--"
"NOOOOOOOO!" boomed out a very beefy, stereotypical, American ghetto feminine voice, along with a very powerful sound of flesh slapping against flesh.
Twilight's eyes widen in alarm in response, a bright red blush coming over her face.
"Uhhhh, did that come from where I think it came from?" she spoke in a low voice.
"Twilight, you need to unleash the most powerful spell known to ponykind on Tirek." spoke.... the flapping cheeks of her butt, slapping against the other one as they 'spoke'. It seemed... her butt uses her cheeks as a mouth to speak.
Through this exchange between Twilight and her now sapient backside Tirek simply stared in utter bewilderment. A talking ass seemed just too much for him to comprehend. Everyone else was pretty confused too, apart from a pink earth pony trapped in a magic bubble like the others, said pony was smiling broadly at this strange turn of events.
"You're... my butt?" she said in a low voice, not believing that she was speaking to her own ass.
"Yes Twilight, you have the power to defeat Tirek easily with your butt! Your butt wields the power more deadly than any that walks this earth and beyond. You and your friends just have to believe in the power of the Booty Force!"
"The Booty Force?" she spoke curiously, tilting her head to the side and perking her ears.
"Combined with the power of Sunbutt, Moonbutt, Lovebutt and your Magicbutt you can call upon the powers of the Booty Force to defeat this evil!"
"How am I supposed to use this so called Booty Force?!" Twilight roared, stomping her hooves.
"You all must believe in the Booty Force!" her butt shouted.
“I believe in the Booty Force!” screamed Pinkie Pie.
Twilight opened her mouth wide to unleash a loud moan, whilst her body doubled in size within a fraction of a second, shooting up into the air. Though, her rump seemed to grow a great deal fatter and have a far more defined bubble butt shape.
“Enough of this!” Tirek roared, raising his hoof to stomp her.
“I believe in the Booty Force!” shouted Twilight and all her friends together.
Twilight uttered a loud neigh, before…. she skyrocketed in height and width, quickly becoming just as tall as Tirek, with a massive, hilly rump that was considerably larger than his own.
Tirek gulped in fear, while Twilight stared at him with an evil grin.
"Mwahahaha! Now you will know the true power of pony butt!” roared Twilight’s butt, her cheeks slapping against one another with a very loud smack of flesh slapping against flesh.
Tirek took two steps back as Twilight grew in size before him, surging up into the air. Those two steps quickly turned into full gallop, as Twilight showed no sign of stopping her growth.
More and more layers of pillowy soft fat added to her butt in a manner of seconds. Her hooves elongated, becoming stronger and thicker to help support the growing mass of her body. Her rump assumed greater and greater size, becoming fatter and fatter, bigger and bigger, heavier and heavier. Somehow… her growing weight didn’t crush the earth beneath her.
Twilight's enormous flanks quickly swelled larger and larger in size, surging up like mountains over the land. Between her gargantuan, ballooning cheeks a great canyon was forming that no little stallion cock could ever hope to hot dog. Her vagina and asshole became gaping craters that no stallion’s cock had a hope to ever fill.
When Twilight finally stopped growing… her head reached above the clouds, her massive body casting a vast dark shadow over the land. Her massive cheeks were mountains of purple squishy soft flesh, jiggling wildly even with the smallest of movements.
“Find the evil one and sit on him!” boomed Twilight’s butt in a deafeningly loud voice, that was so loud everyone in Equestria could hear it, the slap of her cheeks was so loud that it could be heard halfway across the planet, thankfully the Booty Force protected the ear drums of all who heard it.
Twilight narrowed her eyes, lighting up her massive horn with blinding light, using a spell to scan the planet.
A nasty grin came upon her face when she saw Tirek was hiding in a cave in the frozen north. With a simple flick of her magic Tirek was teleported with a flash and brought beneath a vast dark shadow belonging to Twilight's super-massive butt.
Tirek tried to use his magic to escape, but his horns seemed to be gone, replaced with mere stumps. Tirek tried to run, but he felt as if his hooves were glued in place.
With that, the titan mare slammed her massive rump upon him, her immense weight somehow not obliterating his body.
Tirek fearing for his life immediately began to use great strength to push Twilight off him. Tirek’s hands dug deep into the ridiculously thick, squishy soft fat of Twilight’s colossal rump, before he managed to lift her quite easily due to his super strength
“Don’t let him win! Believe in the Booty Force!” boomed her butt.
All across Equestria and the world, everyone cried out in one voice and said. “I believe in the Booty Force!”
There came a low rumble, before Twilight’s rump went through a series of unending, violent growth spurts. Her cheeks spread across the whole world like tidal waves of squishy soft fat, her cheeks not harming any living thing as they were smothered in their incredible softness. Her soft fat folded around everything, depressing deeply from their applied pressure. Those beneath the growing tide of fat were still able to breathe, their worship of her ass by kissing, licking, humping and rubbing only helped her butt grow even faster.
Twilight’s head soon came into space. A hairless ape alien species were masturbating to her butt from some distant planet.
All of Equestria was quickly covered by Twilight’s butt, followed shortly by pretty much all the upper half of the planet, her cheeks continuing to grow from there and expand out to space itself.
Tirek held strong for quite sometime from beneath the rapidly growing weight of Twilight’s ballooning cheeks, before his arms gave up, and he was smothered by the mass of her growing rump.
Twilight continued to grow more and more until… she was so large that she could fit the entire planet between the canyon of her rump.
Tirek said something… but it came as a mere muffle. He choked for breath, his eyes soon became heavy, the softness and heavy mass of Twilight’s rump was sucking the life out of him.
Soon, darkness took him. At this, Twilight’s rump slowly, but surely began to shrink.
Tirek opened his eyes to find himself chained up in a small, dark cell.
“Fucking pony butts!” he roared in rage, rattling his chains.
