Ponies: Pinkie, Twilight
Fetishes: Growth, Macro
Orgasms: 1
Positions: Twilight caught under Pinkie's fat, jiggling butt.
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"Are you ready yet, Pinkie?" Twilight asked rather impatiently, levitating a spellbook beside her as she watched the silly pink mare "preparing"; stretching her body and legs in various ways as if she were preparing for some kind of athletic event.

"Ahh...there! All done!" Pinkie replied with an excited giggle after one last stretch, standing back up again and smiling eagerly toward Twilight. "Okay, all pre-magic stretching complete, whenever you're ready Twilight!"

"Finally." Twilight sighed, before glancing into the spellbook again. "Alright, here goes..." she added, before her horn glowed a little brighter, casting the spell she was reading in the book. Pinkie’s body was quickly surrounded by the pinkish-purple magic aura as the spell began to work, making the pink mare slowly grow larger, inch by inch.

“Oooh, hehe, this tickles!” Pinkie giggled excitedly, shivering a bit as the tingly magic flowed through her body, growing her at least six inches taller before stopping, the magic aura fading from her body. “Hehe, that was fun, Twilight! Do it again!” she giggled with a big smile, hopping up and down in place.

“Hehe, not a chance Pinkie.” Twilight giggled softly as well, smiling at the result of her seemingly successful spell, the pink mare noticeably taller than she was before. “I don’t want you outgrowing Ponyville like Zecora did that one time. Now, where is the shrinking spell...” she thought out loud, before flipping through the pages of the book.

“Awww, but it felt so good!” Pinkie poked her tongue out and giggled again, before gasping softly as she felt the tingles again, glancing down at her body. “Oooh, thank you for reconsidering Twilight!” she spoke eagerly, giggling excitedly as her body began to grow again, gaining inches at a slightly faster pace than before.

“Mm...what was that?” Twilight asked, not really noticing the pink mare’s talking, having been too absorbed in her reading for the couple moments before, flipping another page before looking up from her book and gasping. “Pinkie! You’re still growing?” she gasped, watching as the excited mare kept growing and growing, now even taller than Celestia at this point, smiling down at Twilight.

“Hehe, this feels really good, Twilight!” the excited mare replied with a big grin, hopping up and down excitedly again, only making the floor rumble violently.

“Agh! Pinkie, get outside, now!” Twilight groaned, opening the door with her magic as she watched Pinkie continue to grow and grow; the pink mare nodding before turning around and hopping over towards the door, laying down and trying to squeeze herself through the now small doorway.

She did manage to make it halfway through, before she gasped and hiccuped, suddenly surging larger in size, effectively leaving her body stuck in the doorway; her lower half much too large to fit through it. “Uhm...what happened, Twilight?” she asked, glancing back at the door, noticing she had grown a lot now and smiling wide. “Wow! I’m so big now!”

“Why are you still growing? This spell is only supposed to cause minor growth!” Twilight groaned in annoyance, trying not to panic too much as she came up behind the huge pink mare and pressed her hooves against Pinkie’s huge rear, starting to push her firmly, trying to squeeze her through the doorway. “Get...nngh...outside...before you...break the library!” she groaned, pushing as hard as she could on the huge mare’s rump; blushing lightly though at how soft it felt now, due to its massive size.

“Ah! I’m trying!” Pinkie replied, holding onto the sides of the doorway and trying to push herself forward, stretching and cracking the doorway as her lower body squeezed through it, finally breaking through it with a crash, sending the huge pink mare flying forward a good five or ten feet. “Oogh, that was weird.” she softly groaned, slowly getting up to her feet and looking around, smiling wide again as she more easily noticed her increased height now that she was outside. “Hehe, look at me Twilight! I’m huge!”

Panting softly after all that physical strain, Twilight glanced out of her now smashed door, her jaw dropping as she saw the massive pink mare out in front of her home, hopping up and down eagerly as she usually did. “Why is my spell acting so strangely on Pinkie?” she thought out loud, watching in awe as the pink mare hopped around, her massive rump jiggling and bouncing, now noticeably fatter as well.

“Mmm, and it feels so good, too!” the giant pink mare added, sighing blissfully and stretching her body a bit as she continued to grow even further; the tingling from Twilight’s magic seeming to intensify as her size increased, turning over to pleasurable tingling now as her height passed fifteen feet.

Biting her lip softly, Twilight quickly moved up behind the mare, her horn glowing once more as she prepared another spell. “This should fix her...I hope!” she thought, before her magic zapped the giant pink mare, only making her cry out in surprise and jump; The unicorn gasping as the overgrown Pinkie came right back down, squishing Twilight underneath her soft rump, which jiggled around as it made hard contact with the ground.

“Agh, what was that Twilight?” Pinkie groaned, looking around herself but not seeing Twilight anywhere, blinking a bit in surprise. “Twilight? Where’d you go?” she asked, not feeling the little unicorn squirming underneath her fat rump, which was keeping her pinned to the ground. “Ooh, there you are Twilight!” Pinkie smiled as she glanced down behind herself, seeing a purple hoof sticking out from beneath her huge butt, reaching down and pulling Twilight out, the unicorn gasping for air as she landed on Pinkie’s plush tail.

“Ahhh...b-be careful, Pinkie!” Twilight gasped, looking up at the giant pink mare sitting in front of her, who only smiled eagerly back at her. “You have to be careful with your bigger size, you could hurt someone!” she added, though she wasn’t really injured at all due to the softness of the mare’s rump, which was still fattening up nicely at a slower pace than her growth.

“Hehe, sorry Twilight! You just scared me there.” Pinkie giggled and blushed a bit, still smiling down at the little purple unicorn as her body kept growing, now a little over twenty feet, while the pleasurable tingling only increased further, arousing the giant pink mare even more. “Mmnh, is it getting hotter out here?” she thought out loud, glancing up into the clear sky for a moment, before back down between her legs, feeling a familiar tingling between them.

“Oh no...don’t tell me she’s getting horny, too!” Twilight groaned, hopping off the pink fluffy tail and onto the ground again, blushing a bit herself as she caught a good whiff of Pinkie’s arousal, the giant mare starting to become quite moist between her legs. “Pinkie, stay here! Don’t go anywhere, okay?” she shouted up to the giant pink pony, before running back inside her library, starting to search for a more powerful shrinking spell.

“Mm, you got it Twilight!” Pinkie giggled softly, before sighing contently, sitting back against the huge tree-library, now roughly thirty feet tall, and only becoming more aroused with each passing moment. “Mmnh, what’s going on? I just clopped last night.” she thought out loud, glancing down between her legs, noticing that her clitoris had swollen slightly larger as well, while a bit of her carnal juices flowing down from her moist slit.

“I suppose another quickie-clop couldn’t hurt!” she thought with a smile, before bringing her hoof down between her legs, sighing blissfully as she started to rub her moist slit firmly, closing her eyes and leaning her head back, not noticing that the sexual stimulation only seemed to be increasing her size even more.

“Ahhh...s-so sensitive...” she softly moaned, the growth having made her sex much more sensitive to touch, only bringing her tons of pleasure from the firm rubbing, while her body continued to grow and grow, soon making her even bigger than the tree she was sitting back against. Inside the library, Twilight groaned in annoyance, blushing as she heard the giant mare moaning happily, frantically searching through her books for a spell to return her to her normal size.

“Mmmnh...!” Pinkie only continued to sigh and moan in pleasure as she rubbed herself, surging up bigger and bigger against Twilight’s library, passing fifty feet now as her pleasure increased. Now towering over most of the buildings around her, she spotted the rather large and phallic-shaped Town Hall, grinning and licking her lips a bit. “Hehe...that looks like fun!” she thought out loud with a soft giggle, pulling her hoof up from between her legs before getting up and hopping towards the center of town, each hop causing small earthquakes all around her.

“Where is she going?” Twilight groaned, dropping her books and rushing out the door as she watched the giant pink mare hopping through Ponyville, heading in the direction of the town hall. “Agh, not town hall!” she gasped, before rushing off after the giant mare, biting her lip softly as her nostrils were filled with the scent of Pinkie’s arousal, her cheeks blushing cutely again as she fought back her own arousal.

Of course, with a gigantic Pinkie hopping through ponyville, many of its residents panicked and fled, not wanting to be crushed underhoof by the giant mare, though she seemed blissfully unaware of the chaos she was causing, grinning wide as she kept her gaze fixed on that big tower in front of her, eager to use it for her own enjoyment.

“Hehe...oh wow, this is even bigger than I remembered!” she giggled softly to herself, towering over the pointy building at roughly seventy five feet now, licking her lips eagerly before turning around and raising her rump up, aligning the tip of the building with her moist nether lips, before pushing her waist back down again, groaning blissfully as the building pushed inside her. “Ooh yeah...!”

Twilight meanwhile blushed deeply to the sight, stopping just outside the town square as she watched the giant pink mare pleasure herself with the building, staring in disbelief at the ridiculous, yet somewhat sexy sight in front of her. “What have I done?” she groaned, shaking her head softly, before slowly advancing towards the giant Pinkie, who seemed to still be growing, spurred on by her sexual pleasure.

“Aaah...” The giant mare moaned cutely as she kept shifting her hips up and down, riding the building steadily, easily pushing it nice and deep inside herself as she grew, slowly shifting into a more natural cowgirl position on top of the building. Each time she came down, her plump rear jiggled cutely, now even bigger and rounder than before from the growth magic. "Mmmnh, oh yeah...s-so goood..." she moaned, her cheeks blushing cutely as her pleasure was pushed higher and higher with each movement she made.

As she kept steadily riding, Twilight slowly crept up beneath her, keeping her gaze on the mare's gigantic rump, watching as it jiggled and bounced sexily each time Pinkie came down, her own cheeks blushing softly in both arousal and slight jealousy of the pink mare's curves. Shaking her head though, she began to focus her magic, preparing one of her more powerful magic-dispelling spells.

Pinkie was completely oblivious to the little unicorn beneath her though, panting and moaning happily as she kept riding the building nice and fast, soaking it with her warm juices as her soft insides squeezed around the structure, crushing it slightly. "Mmnh...mmnh...mmm!" she sighed in pleasure, already feeling her orgasm building up as one hoof slid down between her legs, starting to rub and press her big clitoris, only stimulating herself even further.

"Come on...nnh...just gotta wait for the right moment..." Twilight thought, her horn still glowing as she had the spell prepared, though she was still somewhat distracted by the giant jiggling butt in front of her, biting her lip gently as she watched it bounce up and down, that along with the strong scent of Pinkie's carnal juices only serving to arouse her greatly.

"Aahh...mmnh...!" The giant Pinkie moaned cutely as she rode the building even faster, panting more as she felt her orgasm coming on; pushing down further each time she came down, causing her fat rump to come dangerously close to Twilight each time. "Ooohh yeah...I'm cumming, Mr.Town Hall!" she cried out blissfully as she finally climaxed moments later, pressing herself down all the way on the structure as her cunny squeezed it tightly and released a torrent of her hot juices all over it.

Of course, with her plump rear pressed all the way down, it inevitably squished Twilight again, the unicorn groaning loudly underneath the weight of the massive butt jiggling on top of her, though the shock from it caused her to release her spell. Pinkie's gigantic body began to glow again as the magic was dispelled, the giant mare gasping and opening her eyes again as she felt the surge of magic within her, looking down at her body grew even bigger, swelling up a few feet taller before suddenly "exploding" and returning to her normal size.

"Ah! What happened?" she gasped, looking around and noticing that everything was normal sized to her again, before glancing down at her body, seeing that she was normal sized as well. "Awww, I was having so much fun though....wait a minute." she thought out loud, suddenly realizing that she was about thirty feet off the ground, in midair. "Hm...gravity seems a bit slow today." she added, before falling straight down, shouting out in terror.

Just below her, Twilight groaned lightly as she picked herself up, shaking her head a bit after the collision with Pinkie's giant butt just moments ago. "Mngh, did it work?" she thought, before looking up, seeing a familiar pink mare plummeting down towards her. "Agh! Pinkie!" she shouted, before Pinkie landed on her again, pressing her to the ground once more with the pink mare's butt on her head.

"Oogh, thanks Twilight!" Pinkie giggled, smiling back at Twilight, having landed on top of her facing away from her, thus her bubble-butt pressing against the unicorn's head again. "That was a ton of fun! Can we do it again, huh, can we?" she giggled excitedly, smiling wide back at Twilight, who only grumbled in annoyance.

“Pinkie, you almost completely destroyed town hall!” Twilight replied, looking worriedly back at the pink mare as she lifted her head up again, causing Pinkie’s lower body to roll off to the side. “If it hadn’t been rebuilt recently with stronger materials, you probably would have completely demolished it!”

“Aww, I guess I should be a little careful...but being big was so much fun!” Pinkie only smiled and giggled excitedly, standing back up again and hopping up and down. “C’mon Twilight! Do it again! I was having so much fun as Pinkiezilla!” she added, poking her tongue out cutely. “Ooh, that sounds like a good title for this story, doesn’t it?”

Sighing in annoyance, Twilight only shook her head softly as she stood up again. “Sometimes I worry about you, Pinkie.”

LE END, I suppose. Not sure where I’m going with this.