Mountainshy

by MassDriver

Rating: mature
Tags: Anthro, My Little Pony: Friendship is Magic, Fluttershy, Sex
Length: 4421

Fluttershy finds an ancient idol that turns her into a curvy, mountain-sized giantess.

On an expedition to an ancient temple, the Mane Six find an ancient idol - and when Fluttershy touches it, it grants her the strength and size to protect all of Ponyville. Her curvaceous body shakes the earth, outgrows mountains, and attracts a following of stallions eager to pleasure her.

Contains: Growth, Giantess (60 - 3600 feet tall), Size Difference

This story was a commission! If you want one of your own, see my commission policy and prices here. I can also be reached at massdriver77 {at} gmail {dot} com, or on Discord at MassDriver#3858.

I've also set up a Ko-fi! If you want to support my work but you're not looking for a commission, it's a great way to leave a tip!

Cover art is derpibooru 1174114, by apbuske, used without permission.

Published 2017-07-17 23:20:07 UTC
Last updated 2017-07-17 23:20:07 UTC

Chapter 1

“What are you all so nervous about?” asked Fluttershy.

Her friends were all cowering on the opposite side of the stone room, with their backs up against a wall.

“Aw, don't worry! She's not going to bite!” Fluttershy lifted her hand and gently stroked the beautiful emerald-green snake under its chin. The snake relaxed its weight onto her shoulders, and Fluttershy grunted a bit with the effort of supporting it. Getting to see a Loa Constrictor up close was an incredible opportunity, but they were terribly heavy creatures.

“Oh, girls,” she said, wriggling her toes as still more snakes slithered around her feet, “I can't thank you enough for bringing me along. I feel so embarrassed about trying to stay home… I've gotten to meet so many amazing new animals!”

The girls had brought Fluttershy along for this very reason; they were investigating an ancient temple on Daring Do’s behalf, and she'd told them to expect that the temple’s traps would all be set to release dangerous animals.

(Twilight had asked how a centuries-old temple could have live animals ready to release when a trap was sprung. Daring Do had told her it was “just one of those things” and seemed to have no further insights.)

Fluttershy’s kinship with animals had proved invaluable; no sooner had a trap released its creepy-crawly than Fluttershy had made friends with it. The rest of the team, though, was having a harder time.

“Did it have to be snakes?” groaned Rainbow Dash. “And if so, why?”

“I was really hopin’ for a more reflex-based set of traps,” said Applejack. “Like, a big heavy stone door comes down, and I just barely get through it, ‘cept my hat falls off, and then I reach back through the doorway and get my hat just before the door slams down.”

“And then some guy is doing a bunch of fancy sword moves but I just shoot him with my gun!” said Pinkie.

“What's a ‘gun’?” asked Rarity.

“Fluttershy,” said Twilight, calling out across the room, “since you're the only one who's… comfortable… over there… could you just grab the idol? The sooner we have it, the sooner we can, you know… leave.”

“Oh!” Said Fluttershy. “I'm sorry, girls. I was just having so much fun getting to know these exotic species…” she slowly lifted her foot, taking care not to disturb the snakes slithering around her ankles as she stepped towards the pedestal.

The idol depicted a squat figure, possibly a mare, with an expression that wasn't entirely unkind. It wasn't the prettiest thing, but it was from a time before sculpture had become all that refined as an art form, and Fluttershy wasn't one to judge. She wrapped her fingers around the stone idol, lifting it from the pedestal - and then a voice boomed through the chamber.

It was so loud it shook the stone walls, and it was speaking a language Fluttershy had never heard. Twilight's lips were moving - she seemed to be attempting a rough translation, but she didn't seem sure of herself. Also, Fluttershy couldn't hear a word she was saying over the booming voice.

Fluttershy felt the weight of the snake on her shoulders shift lazily, and she realized that this voice - deafeningly loud as it was - didn't seem to be disturbing the animals at all. The presence of calm animals always helped Fluttershy relax, and now was no different; as the voice went on, Fluttershy felt her heartbeat calm.

But then her heartbeat raced as the voice stopped, and she clutched her belly as warmth spread through her body. She felt tired all of a sudden, as if she’d just gotten done running a marathon. She had just enough energy to lower herself slowly to the ground, letting the snakes at her feet slither out of the way as she curled up on the stone floor. Just before she closed her eyes, she saw her friends rushing over to pick her up.

“Well, at least she looks nice,” said Applejack, “But why did you pack a low-cut red dress in Fluttershy’s size? You did know we were raidin’ an ancient temple, right?”

“It does not hurt to be prepared,” said Rarity. “And since you girls refuse to pack formalwear on excursions such as these, I take the liberty of packing suitable clothes for all of you.”

“Well, I’m glad you did,” said Twilight. “I was worried we didn’t have any clean clothes to change Fluttershy into.” She glanced out the train’s window and saw the rooftops of Ponyville approaching. Finally, they were almost home.

“Is she really going to be okay?” asked Pinkie, leaning over the seat they’d lay Fluttershy on. “She shouldn’t be asleep this long…”

“You’re right, she shouldn’t,” said Twilight. “And I’m not a doctor, but physiologically everything about her sleep is completely normal. In terms of breathing, heartbeat, eye movement… she seems to be getting a normal, healthy, restful sleep.”

“That she can’t wake up from,” said Rainbow Dash.

“That she can’t wake up from, yes,” said Twilight, sighing.

The train pulled into the station, and Twilight and Rarity each used their magic to hold one end of Fluttershy’s body steady. “We’ll get her to the hospital,” said Twilight. “We’ll get in touch with Daring Do… maybe ask if the princesses know anything…” she grumbled as an unpleasant thought occurred to her. “And then if they can’t help, maybe we’ll… talk to Fluttershy’s friend. The chaos guy.”

Discord had a habit of showing up when his name was spoken.

The hospital wasn’t far from the train station - close enough, in fact, that simply walking there was the most practical choice. But the girls hadn’t gotten more than a few steps up the road before Fluttershy began to stir.

Eyes wide with shock, they lowered Fluttershy onto the ground, circling her to observe this change in her condition. Her eyes flitted open, and she looked at the faces of her friends one by one. “Am I outside?” she muttered sleepily - and then her body began to change. Each of her friends noticed something different; Rainbow Dash and Applejack watched the musculature of her arms grow thicker and stronger. Pinkie Pie’s eyes widened as she watched her hips widen and her bottom fill out with outlandish curvature. And Twilight and Rarity stared admiringly at Fluttershy’s breasts as they rounded out, pushing the neckline of her slim red dress down as they expanded.

But her body wasn’t just changing shape. It wasn’t just filling out with strength and gorgeous curvature. It was growing. Bigger and taller, pushing her friends aside with rapid expansion. Twilight grabbed Rarity, and Rainbow Dash took hold of Applejack, lifting them out of the way of Fluttershy’s explosive growth. They scanned the ground for Pinkie Pie, worried that she’d been pinned underneath Fluttershy’s growing body, but they saw her climbing onto the soft pudge of Fluttershy’s belly just as she grew past twenty feet tall. The red dress they’d put on Fluttershy stretched and tightened as she grew, but it never tore.

Fluttershy was still waking up, testing her limbs as they grew, not fully understanding that she was growing larger. An outstretched arm reached towards the train station the girls had just left, nudging the empty train they had arrived in. And as she grew larger - to forty feet, fifty feet - she pushed the train onto its side.

Fluttershy’s growth was so fast that none of her friends had even begun to formulate a response. If she kept growing, she would endanger Ponyville within minutes… but there would be no time for an evacuation. Twilight’s mind in particular was racing, calculating, hypothesizing… but then she saw Fluttershy’s growth begin to slow.

Sixty feet tall, still flat on her back, Fluttershy stopped growing, and her eyes opened fully, taking in the wide blue sky - then the low skyline of Ponyville as she turned her head. Pinkie Pie, gleefully bouncing on Fluttershy, belly, skipped towards her head, bouncing off her giant boobs like pinball bumpers as she advanced towards her enormous friend’s chin.

“Hi Flutters!” said Pinkie, waving her arms over her head to catch her attention. “I'm so glad you're awake! Are you okay?”

“I feel just fine,” said Fluttershy. “I'm sorry if you were worried about me, but I'm all right now.”

“I'm sorry to be the one to point this out,” said Rarity, “but your body has grown tremendously and none of us know why.”

“Oh, I know why,” said Fluttershy. She wrapped her fingers around Pinkie Pie and set her down on the grass. “While I was sleeping, I was talking to that voice we heard in the temple.”

Twilight flitted down to the ground, setting Rarity down. “You spoke to it?”

“She was nice, actually,” said Fluttershy, sitting up. Her head rose some thirty feet in the air, and ponies turned to look all over Ponyville. As far away as Canterlot, ponies who were looking in Ponyville’s direction could see that an enormous, curvaceous pony was towering over the town’s rooftops.

“She was trying to talk to me when she was speaking in the temple,” said Fluttershy. “But she needed to be in my dream to get past the language barrier.”

“And then… she made you big?” asked Rainbow Dash.

“She was looking for someone to inherit her power,” said Fluttershy. “She cared so much for animals, and when she saw me getting along with all her snakes and spiders and flesh-tearing giant beetles and caustic slugs…” her friends shuddered. “She thought I would be a good choice.”

“And you accepted?” asked Twilight. “You chose to grow bigger? I'm not sure if this is a good idea…”

“Oh, Twilight, I know you mean well, but I've made up my mind. I've dedicated myself to embodying power and kindness, protecting the ponies and animals of Equestria with my size and strength.”

“Wow,” said Rainbow Dash, “you seem way more confident than usual, Fluttershy.”

“During the dream, the voice gave me a pretty good pep talk,” said Fluttershy. “And being strong feels so wonderful. Now I can care for everyone without having to worry about getting hurt.”

“Well, it sounds like you've put some thought into this,” said Twilight. “I suppose if anyone can handle this sort of strength responsibly, it's you.”

“Thank you!” said Fluttershy. Your support means so much to me.”

“And you can start by putting that train back on the rails.”

“Oh!” Said Fluttershy. “Oh, of course!”

Fluttershy took careful, measured steps through the center of town, carefully avoiding anything breakable or squishable. Although she stepped daintily, the ground still shook each time her feet hit it. In addition to being enormously tall, her body had become much wider: her shoulders were broader and her arms far more muscular. Her tits had started out above average, but now were massive even for a mare of her size, huge soft mounds that dwarfed her head. And her hips were widest of all, powerfully thick, lined with muscle and cushioned with a generous layer of jiggle. Her ass eclipsed the sun as she passed over Ponyville, and the ponies of the town stared up in awe.

Any other sixty-foot pony might have caused a panic, but everyone in Ponyville knew Fluttershy. She was the kindest, most gentle-hearted pony they knew, and that seemingly hadn’t changed. She was excusing herself as she made her way through town, stopping to let ponies pass and stepping carefully around buildings.

And while she was still the same Fluttershy, she walked with more confidence than before. She still wore the red dress that Rarity had given her; it had gotten tighter as Fluttershy had grown, but it had expanded enough that it was still a comfortable fit. But it only came down to mid-thigh, and Fluttershy didn’t seem too concerned with the possibility - the certainty - that ponies would be able to see up her skirt.

In fact, she seemed to be seeking out opportunities to stand still above gatherings of stallions, positioning her legs on either side of them, giving them a chance to stare upward and see the intersection of her thick, butter-yellow thighs.

And when she finally made it across town, coming her home and her nearby animal sanctuary, there was a line of stallions following her, enraptured by her beauty and the ampleness of her body. “Oh, my,” she said, smiling broadly, “It seems I have the attention of a great many gentlecolts. I suppose there is more than enough of me for all of you now…”

She took a moment to look down at her house as she passed it. She knew she would never have a house of her own again, but the whole outdoors felt like her home now. Maybe the nature preserve would be a better place to lay her head; it was wide open and full of animals. She walked on, crossing the distance between her old home and her new one with just a few long strides, and reclined in the sanctuary as she waited for her stallions to catch up with her.

Fluttershy’s animals recognized her right away. Whenever she returned from an extended absence, most of them wanted to hug or snuggle her, and it led to something of a dogpile - albeit one where only some of the creatures involved were dogs, and many of them were considerably larger than dogs.

But now, each creature could claim its own little section of Fluttershy, cuddling up to a thick, powerful leg, a big round buttcheek, or - in the case of more ambitious animals - curling up in her cleavage. “It’s lovely to see you all too,” said Fluttershy, reaching out with powerful fingers to gently stroke their fur.

The stallions caught up with her, about a couple dozen making their way into the clearing. “So many handsome stallions,” said Fluttershy mischievously. “Before I was big, I would have been terribly nervous about talking to even one of you… and now I’m not sure you’ll be enough for me.” She extended her hand, laying it in front of the nearest stallion - who, as it happened, was Big Macintosh - and lifting it again when he stepped onto her fingers.

“You know, I always had a bit of a crush on you, Big Mac,” she said. “I guess I’m a little too big for just one stallion now.” She brought him to her face, and planted a kiss on his entire face. “But you can be one of my coltfriends, if you’d like.”

She lay him on her belly, and addressed the group. “It looks like you’re all eager to prove your affection,” she said, “And it just so happens that I’m a little bit sore from oversleeping. Could you strong little stallions give me a massage?”

The stallions went to work, collaborating to put pressure on the right muscle groups, diligent and organized as they worked their way up and down Fluttershy’s massive body. Every once in a while, a stallion would indulge himself, stroking her skin with and breathing in her scent. Sometimes they would stroke their whole bodies against her, and she could feel their hard cocks through their pants. She enjoyed the sensation; it felt like sensual worship from her little followers.

The first time she’d grown, she’d been half-asleep. But now she was wide awake, and she felt it again. Her body spread out, slowly pushing back against the stallions who were massaging her. They kept up their work, stroking and kneading her growing body, using all their strength to massage a body that was bigger and stronger by the second.

Her legs extended into the forest beyond the sanctuary’s edge, and she couldn’t help doing a little damage to the trees. Her legs, bigger and thicker than any tree trunk, grew outward into the forest, knocking aside trees and shrubs, clearing a wide path. The animals, fortunately, could sense her presence, and moved aside - only to return when she was done growing, to snuggle against her and bask in her warmth.

Fluttershy felt herself stop growing, and she guessed that she was now twice as tall as before - some one hundred and twenty feet. “Oh my,” she said, “I’m taking up almost all the space in the animal sanctuary. I’ll have to figure out a more permanent residence… but first I suppose I should wait and see if I grow any more…”

Fluttershy reclined against the mountains that overlooked Ponyville. Canterlot was within arm’s reach; over the course of the past couple weeks, both Canterlot and Ponyville had gotten accustomed to the sight of the giant, powerful mare. Some concerns had been raised, but Fluttershy proved her gentle nature, and besides that she was a friend of the princesses and an Element of Harmony to boot. At a height of twenty-five hundred feet, she could have lain waste to Canterlot with a swipe of her arm and flattened most of Ponyville with a few well-placed bellyflops. But she was gentle and cautious, and no one had come to harm under her protection.

She’d also gathered quite the following. Over a hundred stallions were now proud to be one of Fluttershy’s “coltfriends,” and she loved them all, just as she loved her animals. And her animal sanctuary had grown as well; she’d cultivated a much larger space, using her tremendous strength to make landscaping easy, and extended her “territory” into the Everfree.

The untamed forest used to be a frightening place, even for someone as in tune with nature as Fluttershy. But the beasts of the Everfree were no threat to her now, and she’d cowed many of them with her strength. Even now, there was a manticore curled up like a kitten in her cleavage, and she held an Ursa Major in the palm of her hand, idly stroking its star-spotted fur.

Fluttershy felt a rumble in the ground beneath her, which was unusual. She'd gotten used to causing minor tremors just by moving her body, but aside from that, the ground rarely shook in Ponyville.

Fluttershy gathered up the animals that were resting on her body and set them on the ground, then rose to her feet and looked around her. Whatever was shaking the ground had to be big, and close, but she couldn’t see anything approaching. The ground shook again, but she couldn’t tell what direction it was coming from. She set off for Ponyville - which meant taking a few steps forward, really - to see if her friends had any idea what could be happening.
And then she saw it. Bursting from the ground, straight up in the air. A brown-furred serpent some fifty feet wide. “Land Shark” was a misnomer for a variety of taxonomic reasons, but it was an understandable nickname for the beast. The ridges on its back did resemble those of a shark, and its snout, while recognizably mammalian, wasn’t totally unlike a shark’s mouth.

And, of course, there was the way it “swam” through the earth like water. On the plus side, this meant that the ground under Ponyville was not riddled with fifty-foot-wide tunnels, which was a good thing. On the other hand, the Land Shark could move much, much faster than a creature that actually needed to burrow its way through the ground. It also meant that it was very hard to keep it contained in Tartarus.

Fluttershy had been doing some research on the beasts sealed in Tartarus ever since she’d become a giantess. Her size and strength, combined with her affinity for animals, made her the obvious choice for corralling any escaped monsters, and she’d had a lovely play session with Cerberus earlier that week.

But the Land Shark was bigger than anything she’d tangled with before, and it was turning its eyes on Ponyville. Fluttershy spread her wings, leapt into the air, and flew directly at the monster. She didn’t use her wings much - the force of her flying tended to knock ponies and animals to the ground - but this was an emergency.

She caught the Land Shark with one powerful arm, knocking it off-course just as its serpentine body was curving towards Ponyville. Shrieking, it pointed its mouth at the empty hills outside the town and began to sink below the surface. Fluttershy couldn’t be sure if it was attempting a retreat or an ambush, but she wasn’t going to give it the chance. She dove to the ground, bringing the full weight of her body into the earth, rattling furniture as far away as Canterlot. She usually avoided causing such disturbances, but now it was necessary: she hit the ground just in time to grab the Shark’s tail.

Keeping her grip on the beast’s tail, she pulled it from the ground and seized its neck with her other hand. “Okay, you,” she said, bringing its face level with hers and fixing it with the Stare, “I’m the boss around here, and I don’t let animals behave like that. I don’t want to send you back to Tartarus, but I absolutely will if you don’t start taking it easy. Understand?”

The Land Shark whimpered.

“Okay,” said Fluttershy. With the beast still in her hands, she made her way back to the mountains. “You’ll get one chance to play nice, and if you don’t, it’s back to time out for you.” She threw the Land Shark around her neck like a feather boa and reclined against the mountains, settling her massive body against the sheer face of the stone.

“All right, boys,” she said, her enormous ass digging furrows into the ground below as her body settled. “I’m sure you found it exciting to watch your lovely goddess protect Equestria… so why don’t you held me unwind?”

She parted her legs, moving aside her thick yellow thighs to reveal her massive marehood.. Her slit was towering, about a hundred feet tall, and already dripping with arousal as her stable of stallions approached. The earth ponies stood at the base, massaging her lips with their hands and licking the slick flesh. Still more climbed inside her, stroking the walls of her pussy from within. Unicorns pleasured her with magic, taking perches on her things and sending gentle vibrations into her marehood. And pegasi stallions rose to the level of her clit, stroking the nub of sensitive flesh with fingers and tongues.

Even with dozens of stallions attending to her pussy, there were plenty of boyfriends left over. Each of them found a place to contribute, some stroking her thighs her her wide, expansive asscheeks. Some were as far down as her feet, and some as high up as her nipples, teasing them with their hands, their mouths, and eventually their whole bodies.

Fluttershy simply lay back with her arms at her sides. Her little stallions knew just where to touch her, and they could do more for her than her own fingers could. She moaned softly - although even a soft moan from the throat of a giantess echoed through the hills - and her boyfriends grew bolder, stroking and licking with greater intensity.

Fluttershy rolled her hips, setting a sensual rhythm for her stallions to follow, and let out long, heavy breaths as warmth filled her body. The stallions seemed to be doing an especially good job today… but no, it wasn’t just that. SHe recognized this feeling. She was growing again.

Growth spurts had been coming farther and farther apart, and she’d been beginning to think that the previous one would be her last. But it felt so good to grow that she welcomed another one. Being big was more fulfilling than Fluttershy could have imagined, and the power that came with it was wonderful; she wouldn’t mind it if she grew until she could embrace and protect all of Equestria.

Around her neck, the Land Shark stirred, disturbed by her growth - but she stroked it gently, and it settled back down. Down below, her stallions realized that their beautiful goddess was growing larger, and they pleasured her with greater intensity, massaging the sensitive flesh of her pussy with long, deep strokes of their limbs. They were determined to pleasure Fluttershy, to bring her to climax, no matter what her size. Stallions that had been stroking her skin now converged on her marehood, climbing within to pleasure her growing pussy. The unicorns sent more powerful waves of magic into her lips, trying to outpace her growth, to send her toward climax. The pegasi working her clit - whose job was the most crucial of all - stroked their entire bodies against the expanding nub, then began to hump it, stroking their cocks against it as sexual frenzy overtook them.

Even without the valiant efforts of her little stallions, growing was an intensely pleasurable experience, and Fluttershy might have come from growth alone. As her head rose above the mountaintops, her body shook with pleasure and the muscles of her marehood began to tense around the stallions that were inside her. She cried out wordlessly, and the power of her voice shook snow from the white caps of the mountain range. Her body quaked, and the earth quaked along with it.

Fluttershy came, each throb of her marehood sending a shockwave of rapture through her body. The earth pulsed with the rhythm of her climax, and the stallions in her pussy were rewarded by a wave of fragrant fluid, washing over them and soaking the ground below. Her arms spasmed, fists thudding into the mountains behind her and leaving permanent cracks in the rock face. Her trembling legs beat the ground down into new valleys. Her climax went on and on, not ceasing until her growth came to a stop.

Thirty-six hundred feet tall, Fluttershy sighed and slumped down, surrounded by the stallions and animals she loved and cared for. A well-earned sleep fell over her, and the mountains shook, ever so gently, as she snored softly.

Author's Note

This story was a commission! If you want one of your own, see my commission policy and prices here. I can also be reached at massdriver77 {at} gmail {dot} com, or on Discord at MassDriver#3858.

I've also set up a Ko-fi! If you want to support my work but you're not looking for a commission, it's a great way to leave a tip!