She was about to take to the sky when Rainbow noticed something just on the edge of her vision. She jerked her head back, thinking something was hovering over her, but the thing moved with her. In fact, she felt like there was something there, sticking out of the middle of her forehead. She reached up with a talon, confused, and felt it. She gasped. It was unmistakable.

Dash had grown a unicorn’s horn.But that was impossible! Griffon’s didn’t have horns. And it certainly hadn’t been there before. It must have appeared during that last big grow! But how?
I guess I ate a lot of unicorns, she thought. Maybe I absorbed their magic or something?
Whatever the reason, it was definitely there. Hardly daring to believe it, Dash concentrated on the wooden debris that remained of the barn. Sure enough, it was encased in a gentle pink glow, and at the griffon’s mental command, it rose into the air before her.

She laughed. Now no pony will be able to escape! She concentrated again, this time directing her attention at one of the nearby apple trees. Barely trying, she ripped it from the ground. Now this was power! She expanded her reach, and found that she could rip a whole bunch of trees from the ground at once, flinging them over the orchards with her new magic.

As good as it felt, her belly was starting to feel empty again, even with all the struggling ponies inside. Canterlot awaited.

***

Rainbow Dash landed in the middle of Canterlot’s main street, wings eclipsing the sun as ponies stared up at her, dumbfounded. The huge griffon barely fit in the street; her huge hips rubbed against the front of the buildings lining it. A pony stood gaping at a back paw which could easily crush a carriage flat.

Dash looked around, grinning. Her hunger could wait. For now, she wanted to revel in the power she had already. These buildings looked so small and flimsy now. She would show Canterlot what a giant like her could do!

Raising a talon, she ripped apart a nearby shopfront. Chunks of concrete went flying; ponies screamed and scattered, and the streets became chaos. The humongous griffon jumped up in the air with her wings, sending ponies flying to the ground from the downdraft, and landed heavily on top of a small cluster of buildings. She was still only twice the size of the Apple’s barn, but she felt no pain as she stamped on the buildings, crushing them into the ground in mere seconds. It was an amazing power trip- her size, her strength! Nothing could stop her! She could crush the city flat!

As Rainbow stomped over the city, stamping things flat with her paws and rending buildings apart with her talons, she enjoyed it more and more. This is pure power. I can destroy anything and anyone! she thought, loving the sight of ponies running away from the rampaging griffon as fast as they could. The power felt SO good… she was so strong… heat was starting to spread throughout her… she was growing again!

Sure enough, the more Rainbow Dash rampaged through the city, the bigger she was getting. Slowly but surely, and laughing all the while, the giant’s appendages pulsed in size one by one. Soon the griffon couldn’t fit in even the widest streets at all, and was forced to push through buildings everywhere she went, not that she minded. In fact, she did so with glee, stomping, smashing, GROWING as she flaunted her immense power. And her belly started to ache with need…

Dash looked at all the ponies running away as fast as they could. You can’t escape me, she thought with a grin. Her horn glowed, and a dozen of the nearest fleeing ponies were lifted, screaming, into the air. They were smaller than a single claw, now; she could grip five or more at once in a single talon. But it was easier to just use her magic, so Rainbow popped them into her mouth one by one, feeling them struggle as they went down her throat whole. She shivered with pleasure and moaned as she hit a small growth spurt, a back paw now filling half the street it was in. She was tall enough to go one-on-one with a full-grown dragon now. Maybe she’d even get big enough to eat one of those. The thought made her hungrier than ever. She needed to grow, she needed MORE, she needed to fill her belly!

The gigantic griffon walked through Canterlot, casually crushing buildings and swallowing ponies with her magic. Eventually, her gut got full enough to be uncomfortable, so Dash concentrated and picked out dozens of ponies from the panicked streets, lifting them all into the air. She flopped down, flattening more under her enormous body, and stretched out, showing off her slightly rounded belly as she moaned with the pleasure of her still-expanding form. Then she began to feast- pony after pony vanishing into her beak and down her gullet as she massaged her belly with both talons, shoving her tail once again into her dripping cunt. As her belly grew rounder, and Rainbow moaned louder and louder at the feeling of power from the tiny squirming forms inside her body, she began to feel that heat again- stronger than anything, filling her, making her scream in ecstasy-

Her shoulders bulged and widened, her wings extending to match, the muscles rippling as they expanded. Her head and neck grew to fit, and Dash arched her back as her tail grew inside her, getting bigger and thicker, squirming as it filled her up, as wide as one of her paws now- she pulled it out of her slit with a loud moan as she stared at it getting bigger and bigger. Was the rest of her going to grow to match it?! That was… she’d be as big as the castle!

Her mismatched form quivered as Dash grinned. Her tail was insanely huge, longer than the rest of her by far, and her wings were still growing with her head. Her legs and arms were tiny, now, but she knew it was coming next-

And no sooner had she thought it than Rainbow’s arms and talons bulged with heat, expanding rapidly along with her spine and body muscles. Her belly didn’t look nearly as full, now, but there was no time to think about it as she rubbed madly, screaming as the fire filled her legs, it was coming!

Her hips rippled and shook as they widened, the muscles in her legs expanding and pulsing as she trashed and twitched with the best feeling she’d had yet. It was too much, she was in heaven, the growth was better than any other sensation possible, it was too incredible for words!

“MORE!” screamed the griffon, stretching out again, twitching as the heat seemed to intensify even more. “MORE! MORE! BIGGER!”

And her wish was granted as her paws shivered and exploded in size, her toes spreading and the claws unsheathing as they too grew larger. Then suddenly she was subject to even more growth from her legs as they began to match the proportions of her tail, and the growth was happening from the bottom up, bulging in her paws, then hips, then back, and then her shoulders, neck, beak, and finally her wings; they all grew as Rainbow Dash thrashed on the ground, shoving her writhing tail back into herself along with a couple of her claws, screaming as her tail somehow grew AGAIN, and her body following, all of it flooding with the heat of power at once as she orgasmed, spraying juices between her tail and soaking her talons, causing a small flood in the ravaged streets as the griffon finally stopped growing.

Dash lay panting in the middle of the ruined buildings, flexing her back paws and running her talons over her thighs as she pulled her tail back out of herself again. Now she was truly gargantuan. She rolled over, barely noticing the buildings she crushed, and compared her talon to a nearby carriage. Ha! she thought. I could crush it with the tip of a claw. And she could. Grinning, the Griffon Queen stood up, and looked to the castle. She was definitely as big as it was now.

But there was something else. Rainbow squinted, and saw what she was expecting to have seen much earlier. The princesses of Equestria, all four, were flying towards her from the castle. The griffon grinned. Now to show exactly how powerful she was. The puny alicorns couldn’t stop her! They’d be INSIDE her.
,
It happened fast- the princesses stopped in the air before the titanic griffon, and Twilight began to shout something- but Dash wasn’t interested. Before they could react, she lunged forward and snapped her beak shut around three of them. Cadence, Luna and Twilight were swallowed immediately. Celestia was lucky enough to escape, and flew off… for now.

Dash began to feel the energy inside her build. Three alicorns were no small matter, even as tiny as they had been compared to her. The magical energy was building up, and Dash’s body was absorbing it-

The heat rushed to her extremities once more-

Her claws grew, wicked and sharp, followed by her lion’s paws, and then her powerful hind legs as Dash moaned. Even bigger, even bigger… outgrowing the castle, outgrowing the mountain… Growing from the back forward, she felt the changes continue: her hips widening as she dripped marejuice onto the tiny buildings below, her tail thrashing as it shot outward, now her back arching as the muscle bulges, her wings stretching to impossible lengths as she spreads them out, eclipsing everything. She moaned again as her neck grew bigger and longer, her head exploding outward, too, then her powerful shoulders and arms and talons finally growing to match. She flexed them, feeling everything underneath being crushed, nothing to stop her-

Then, she saw something odd- the princess who has escaped her was no longer so tiny. Suspended in the air, Celestia was growing too. Dash laughed as the puny pony princess struggled to power her spell. Dash had more power than Celestia ever would, and decided to show it.

Grabbing the princess from the air- she was a lot bigger; fitting into her talon nicely- she flopped down on the ruined city and slowly, joyfully pushed the thrashing princess into her cunt, legs first. Celestia struggled, but even better, continued to grow. As the gigantic griffon moaned louder and louder, pushing the alicorn further and further in, she was filled up more and more. Finally, with a grunt, Dash pushed Celestia all the way into the slick opening, the folds enveloping her head as she approached the size of a newborn foal relative to the Griffon Queen.

Dash was in heaven. The pony was INSIDE her now, and still growing, filling her up! Her hungry womb sucked Celestia farther in, and Dash’s belly was distended in a different way, now- before it was full of wiggling prey; now it was full of one HUGE wiggling load. Dash could barely contain herself at the feeling of Celestia- now gigantic in her own right- squirming inside of her like a foal, completely helpless, but STILL GROWING.

And then it began- Dash’s incredible power began to work. Celestia’s growth slowed- the griffon giggled as she felt the alicorn’s energy being absorbed by her body. Dash came, fluids flooding the destroyed Canterlot once more as she screamed out in pure ecstasy. Then she began to grow once more.

Celestia seemed to realise what was happening, and thrashed in the inescapable womb as she fuelled Dash’s growth. Dash rubbed her captive lovingly, moaning as her growth reached new heights. before, a claw could crush a carriage. Now it could crush a house. As the princess was absorbed more and more, a claw could crush the city hall, and then even more… The castle was like a toy to the griffon, now; it was half her size. Then a third. Then even less…

Dash stood up as Celestia became tinier and tinier inside. It was a shame that she wouldn’t have the incredible feeling of unbirth again… unless she came across a particularly giant dragon. The thought made her grin as she eyed the castle again, still growing. It was nearly small enough…

The Griffon Queen reached down and ripped the castle from its mountain foundations in two talons, appraising it. Then she opened her beak impossibly wide and munched it down, enjoying the thought of consuming the largest building in the world. Truly, nothing could ever stop her now. Then she eyed the mountain itself as her growth slowed to a stop.

It was about the right size for her moist cunt. Why not have one last orgasm?

Author's Note

Finally finished this piece of shit. Sorry it took so long.

More to come, hopefully. I have a lot of half-started things. Stay tuned.