Bragging Rights

by Charyb

Rating: mature
Tags: Thunderlane, Twilight Sparkle, My Little Pony: Friendship is Magic, Rainbow Dash, Slice of Life, Sex
Length: 7486

A miscast spell makes Rainbow Dash grow bigger whenever she brags about herself. Dash decides it's time to enjoy her newfound bragging rights. Sexually.

Tired of Rainbow Dash's boasting, Twilight casts a spell to make her head swell bigger whenever she tries to brag. The spell, it turns out, does make her head bigger - and the rest of her, too. Now the evergrowing Dash can't see a reason to stop bragging. After all, it feels so good.

[Macro] [Dominance]

Cover art drawn by AlloyRabbit, who makes the most wonderful large ponies.

Published 2015-06-25 20:40:02 UTC
Last updated 2015-06-28 21:33:49 UTC

Anyone You Can Do I Can Do Bigger

Billy the Cloud was a dastardly fiend, wanted in five different towns for raining on parades, and Rainbow Dash had him dead in her sights. She was the toughest weathercop in Equestria, the only one who could bring a mark like him in, and not even the rules — which she never played by anyway — could stop her from seeing justice done. "Dammit, Rainbow Dash," she whispered. "If you don't handle this one by the book, I'll have your badge on my desk before sundown." She grinned. "Well, then, Chief..." Aerial dive! Loop-de-loop! Roundhouse kick! Billie the Cloud exploded into a million tiny water droplets. "...You can call that my resignation."

She turned to Twilight. "You saw that one, right? Tell me you saw that one."

"Mmm?" Twilight barely glanced up from her clipboard. "Yeah, yeah, I saw it."

"You totally didn't!" Dash zipped downward and pushed the clipboard away. "Twilight, come on! This is important! How am I supposed to bring my A-game if nobody's watching?"

Twilight groaned and lit her horn. A magic purple clipboard, twice the size of an actual clipboard, shoved her back. "I don't know if you've noticed, Rainbow Dash," she said, frantically ticking boxes on the real clipboard, "but I'm busy coordinating all the preparations for this festival. I do appreciate your help, but I can't exactly spare the resources to feed your ego right now."

"Ha!" Dash ha'd. "As if my ego needs feeding! You need to lighten up, Twilight." Sheesh, she was so high-strung. "I'm still getting my work done." She took off and kicked three more clouds to smithereens. She took a bow. That one had to get Twilight's attention. "Got a thermometer? I need to see how cool that move was."

"Got a clock?" Twilight asked. "We could see how much time you're wasting with all your showboating."

Seriously? "You know, it's not like I had to help you out with this." Dash muttered, eyes narrowed. "I'm doing this because I want to. I've already done my volunteer hours this week."

"And, as I said, I do appreciate your help." Twilight flipped through her clipboard and penciled in a few more lines. "But this is the first festival I'm organizing as a princess! Celestia and Luna will both be attending, and it needs to be absolutely perfect. If you won't take it seriously, Rainbow, I understand perfectly, but tell me now, so I can find somepony who will."

Seriously? "Hey, I'm totally serious! In fact, 'Serious' is my middle name!" Total lie — it was actually 'Professionalism' — but not like Twilight would know that. She molded a cloud into a makeshift clipboard and started toying with it. "See how serious I'm being right now? I bet I could be even more serious than you!"

"Rainbow..." Twilight started. "If you don't stop that this instant..."

"Blah blah blah," she said, flipping pages on her cloudboard. It was probably a bad idea to tease an alicorn princess, but she was feeling a little spiteful at the moment. "I'm Twilight Sparkle. Numbers and math. I'm all wound up because I'm not getting any and the postal service sent my new dildo to the wrong address!"

"H-hey!" Twilight spluttered, a blush forming on her cheeks. "Who told you that? Rainbow, I'm warning you!"

"Blah blah blah, I'm jealous of Rainbow Dash because she knows how to have fun and I don't, and every stallion in Ponyville knows that."

"That's it!"

Twilight's horn lit up like a torch, and a warm, purplish glow wrapped around Rainbow Dash. Dash tensed, ready at any moment for something crazy or weird, but — no, this didn't feel crazy at all. It felt... it felt like the warmest, most soothing bath she'd ever taken. She could feel her body relaxing, unwinding, and especially so as the magic's tingle ran up between her legs. She took a deep breath and bit her lip, trying to stifle the moan before Twilight could hear it. Yeah. It felt good. Oh, Celestia, did it feel good.

"There."

It took Dash a minute to notice the spell was over. The magic dissipated around her, taking all its warmth and good feelings away with it. She rubbed her thighs together slightly in midair, trying to recapture a bit of its charge, but no, it was gone now. What a tease. She turned her attention back toward Twilight, who was wearing the smuggest grin she'd ever seen — minus her own in the mirror.

"I learned that spell last week," Twilight said, in that self-assured Twilight way. "It was designed for teaching humility. Every time you brag about how much better you are than somepony else, your head will swell up." She grinned. "Get it? Because it's full of hot air?"

Dash's heart nearly stopped in her chest. Nearly. Her jaw, on the other hoof, dropped spectacularly. "What? No! That's too far! Bragging's my thing, Twilight! I can't live without it!"

"Oh, I'm sure you'll manage somehow," Twilight said, refocusing on her clipboard. "I'll remove it tomorrow, before the festival. We can write about it in our Friendship Diary afterward, if you'd like. Think of it as a learning experience."

"Or I can think of it as torture," Dash huffed.

"Or torture." Twilight hardly seemed broken up by that. She flipped a few pages and ticked another box. "Now, if you'll excuse me, Rainbow, I need to enlist another volunteer to handle the clouds in this area. One who can handle things more... you know. Maturely."

Ooh, that did it. Dash would have liked nothing more than to open her word-bank and give Twilight a piece of her mind, but at the current rate she'd end up with three more 'learning experiences' before she could finish even the basic swears. No, the smarter plan would be to bite her tongue now, wait it out, and get Twilight back later on. With interest. "Fine," she said simply. "Fine."

And with that, she took off. Up into the big blue sky, and off to home. Bragging came easier than breathing when she was with somepony else, but if she could lock herself away from everyone she was better than... She could do that. Twenty-four hours, sitting in bed and reading Daring Do books. Maybe blow off a little steam, if she felt like it. The perfect plan. All she had to do was make it to her own front door, and—

"Hey, Rainbow Dash!"

Fuck. She braked to a halt and turned to see who'd called. There, reclining on a cloud, was Thunderlane. He seemed to be enjoying his time off, cock flopped lazily against his belly as he stretched himself out. Double fuck. She liked Thunderlane.

"H-Hey!" She waved back. "How's it going?"

"Pretty good." Thunderlane yawned. "Twilight let you off already?"

Dash glanced away. "Something like that..." she mumbled.

"Cool!" His golden eyes lit up and a grin spread across his face. "How's about a quickie, then?"

"Ehm..." A quickie! Triple fuck. Why Thunderlane? Why now, of all times? It was fate. Destiny. A really rotten destiny.

"Aw, come on, Dash." If she hadn't noticed it earlier, she definitely noticed it now: Thunderlane's cock was swelling up to its full length. A good eleven inches of thick, pulsing stallion cock, more than ready to fill her up. It called to her, even as Thunderlane sat back on his cloud. He seemed hardly aware of his throbbing erection. "It'll be fun! Everyone else is busy with festival prep. Total privacy up here."

"Well..." She licked her lips. Twilight's spell had left her feeling a little hot and bothered. And a fuck and tussle didn't really need all that much bragging... "Okay." She nodded. "I'm in."

"Yes!" Thunderlane cheered, pumping a hoof. He zoomed off and returned with a few more clouds, packing them together with the original to make plenty of space. "Same rules as last time? Warm-up first?"

"You know it." Dash landed and took her stance. Sex in the ancient pegasus tradition. Her favorite. Two ponies wrestled, loser serviced winner. Raw competition, and hotter than Celestia's own sun. "Ready?"

A cocky grin flashed on Thunderlane's face. He tensed as he took his own stance. "Ready!"

Quicker than a cheetah, faster than a speeding bullet, Dash coiled like a spring and sprang. Strategy, schmategy. Blinding, overwhelming speed was the only tactic she needed. She'd gone so fast that it took her a moment to realize she'd missed him. Thunderlane had just barely managed to sidestep her at the last millisecond, and was waving at her with that same, cocky grin on his face. About-face, correct course, charge. Still the only strategy she needed.

Or would have needed, if Thunderlane hadn't been ready this time. "Gotcha!" He blurred to the side and grabbed on, redirecting her momentum into soft, pillowy cloudstuff. They both took a tumble from that one, but Thunderlane was bigger and stronger than her — if not nearly as fast — and by the minute's end he had her pinned. And not only pinned, but in the worst possible position for it: sitting on her chest, swollen balls staring her in the face.

And his cock. Oh, Celestia, his cock. If it looked big from a distance, it towered up close. A tall, black obelisk of throbbing flesh, radiating heat and... something primal. Musky. She could have smelled it a yard away, but near as she was now the odor of Thunderlane's masculinity was thicker than fog. Somewhere above the flaring head of his cock, she could see him grinning wider than ever. "Ready for my prize, Dash."

"Yeah, I know." Dash groaned, more in disappointment at losing than anything else. She buried her muzzle in his sack, taking a deep whiff of sweat and raw sexual need, then groaned for a different reason altogether. Already she could feel her pussy slickening, readying itself for the rut. Rules were rules, she supposed. This was Thunderlane's win... for now. She popped one swollen nut delicately into her mouth, sucking gently as her tongue began fondling it in earnest. A cornucopia of earthy flavors assaulted her as tongue massaged testicle, and she could practically feel every last rumble in Thunderlane's hefty balls, humming and churning with anticipation.

"Unnngh..." Thunderlane let out a long, throaty moan as she switched to the other nut. "Oh, Celestia, that's great, Dash." His stiff wings fluttered and lifted him slightly, allowing her to sit up. "Higher."

And higher she went. Up from his balls, filled to the brim with fresh seed, and on to the dick proper, straining to hold back release. A trickle of slimy, salty precum met her as she licked slowly up the shaft, and her tongue paid special attention toward swirling around the point of contact.

"Fff..." Thunderlane seemed to like that — and of course he would, with the greatest pegasus in Ponyville going down on him. He rose steadily higher in the air, granting her more and more freedom to move. She stopped briefly to drag her tongue across his medial ring before continuing the ascent; a warm, wet climb up his immense stallionhood. Finally she reached the top of his flaring head and planted a sticky, pre-soaked kiss on it, a line of slick fluid connecting it to her lips as she pulled away.

One last shudder from Thunderlane. The last he'd be getting out of her for this win.

"Mm, Dash," he groaned, landing a couple feet away. He wiped a line of drool from his lips, cock still ready at attention and practically crying out for release. "That was pretty good for a warm-up. Can't wait for the real prize."

"Keep waiting." Dash spat and hopped back, ready for round two. She bounced lightly on her hooves, ready to get back into it. The first loss was a rough one, but she had what it took to pull through. All she needed was to get her confidence going. Her fighting spirit needed firing. She puffed herself up and grinned. "I just let the first one go, 'cause I knew you needed the action. You don't really think you could take on the best wrestler in Ponyville, if I get—"

Uh oh. She gasped, even as the words left her lips. That was a brag, plain and simple. She'd done it now. The same purple glow from before ran up her hooves as Twilight's spell took effect. She winced, even as that pleasurable warmth reached her nethers again. It still felt good, but even that was hard to enjoy while knowing her head was about to swell up. She shivered as the magical massage revved into overdrive. A jolt of pleasure shot up her spine and a trickle of fluid ran down her thigh. Okay, she could enjoy that, just a little, but the rest of it was hard to appreciate. Creaking, stretching... an inadvertent moan. The sounds were the worst thing about it. Dash clamped her eyes shut as the process took place, hardly daring to watch her own head get too big for her, and didn't open them again until she was sure the magic had run its course.

"Oh no, oh no, oh no!" She patted her head, running her hooves up and down it. It didn't... seem bigger. She patted it a few more times, just to be sure. No, it didn't feel bigger. In fact, it felt about the same size as it... always had? She stopped. "I'm okay?"

"Um, are you?" Thunderlane asked, a little worried. She looked him in the eyes, hoping for a sign on the status of her head, but the only thing in there was generic concern. If anything, it was Thunderlane who looked weird. He seemed a little different. Smaller, maybe? Just a little?

Nah. She shook her hopefully-normal-sized head. Couldn't be. "I'm fine," she said, half to him and half to herself. "Let's go. Round two. Ready?"

Thunderlane didn't look totally convinced. "You sure, Dash? You looked a little weird for a second there."

"I'm fine," she said, more insistently. She wasn't about to let him back down after taking a win like that. He owed her another shot. But hey, if she couldn't convince him... She turned around to grant him a peek of the goods. A wiggle of her flank with hardly any jiggle — all muscle, of course — and a wink from both ends. "Are you saying I don't look fine?"

Thunderlane bit his lip, his package throbbing even harder. "Ahm, um, no! Not at all! If you — well, if you say you're okay, I guess it's fine." He took his stance, shifting slightly to compensate for his erection. "Ready."

This time was different. Her legs sprang out with just a little more oomph, her take-off just a little bit faster. Ready or not, Thunderlane's dodging still relied on margins of milliseconds, and that didn't take him very far with a full-speed Rainbow Dash hurtling at him. They tumbled again into the cloud, but this time the momentum favored her. Even Thunderlane's ground game felt weaker. His holds were simpler to break, his weight easier to shift. It could have been his boner distracting him — and, if so, she'd planned it all along. Yep.

Whatever it was, the round ended with their positions reversed: Thunderlane pinned on the ground and a more than ready Rainbow Dash sitting on his chest. "Funny," Thunderlane grumbled. "Alright, let me up so I can give you your prize." He made to push her off, and succeeded in nudging her slightly. She pressed down harder and whatever headway he'd managed vanished. He was pinned. "Uh..." Thunderlane's eyes widened in surprise. She would have done the same, if she weren't too busy enjoying the victory. He'd always been able to push her off, if it came down to it. What had changed?

What?

Dash's eyes lit up. He did look a bit smaller like this, didn't he? Twilight's spell couldn't have... Could it? Oh, that would be hot, if it did. She grinned down at her vulnerable fuckbuddy, imagining all she could do with him. Whatever Twilight's spell had done to her could wait. Right now she was hot, she was horny, and she was owed her prize. "I think you're fine where you are," she told him, sliding forward on his chest until her dripping slit stood no more than a few inches from Thunderlane's. She could smell her own need from up above. No doubt he was drowning in it down there, just like he'd done to her. She winked at him, planting quick kiss on his cheek with her netherlips and giggled as thin strands of fluid bridged his muzzle with her crotch. Too funny. Too hot. She was through playing around. She wanted her prize, and she wanted it now.

One word: "Lick."

She didn't have to tell him twice. With as many quickies as they'd both had together, Thunderlane's tongue was probably the most experienced in Ponyville. "Ah!" Every pleasure receptor in her brain started firing as he got to work, licking and lapping at her pussy with gusto. Every slurp and swirl of his tongue seemed to hit just the right spot. He moved smoothly from licks up her puffy lips to squirming about in her innermost depths, and back again, teasing her further and further along with occasional swipes across her throbbing clit. She kept herself busy with setting his tempo, tugging on his silver-blue mane when she needed him faster and thrusting into his muzzle when she needed him deeper. "Ooh, yeah. That's the stuff."

Most of her would have said it didn't get better than this, but some tiny part in the back of her lust-fogged mind whispered that, yes, it could get better than this. And in between thrusts and those decadent laps at her clit, a plan began taking shape. "Bet I'm — oh, Celestia, do that one again!" She stopped for a moan. Thunderlane was pretty good at this. She could hardly even talk straight. "Bet you anything I'm the best you've ever tasted."

That was a brag. One Thunderlane agreed with, judging by his hums of assent, but a brag, nonetheless. A fresh wave of pleasure washed over her as Twilight's spell set to work, no longer visible as a purple glow, but working all the same. And this time she was ready for it. She could feel her body stretching and expanding, her cunt sliding further toward his tongue without need for thrusting. Her tight, strong flank creeping over his chest. The magic's built-in pussy massage only seemed to amplify the sensations from Thunderlane's tonguing, and Dash was content to sit back and drink it in while he drank her in.

If anything, the magic only seemed to bolster the stream of juices flowing down his very thirsty throat.

It struck her now that Twilight's spell was working perfectly. Just not in the way she, or Twilight, would have expected. It did make her head grow bigger — plus the rest of her, too. And if it didn't feel better than sex, it most certainly made sex feel even better. Dash could only grin as her imagination set to work, envisioning herself as the biggest, best pegasus in all of Equestria. Towering over any building, blotting out the sky with her massive wings, standing so tall she'd be more suited to fucking mountains than any stallion's tiny cock.

Another moan escaped her lips, and this time it was only half Thunderlane's fault. It was time do what she did best.

"And after — oh! — after this," she told him, looking down on her precious, little Thunderlane. Thinking of big, bulky Thunderlane as little to an even bigger Rainbow Dash was a huge turn-on, and he'd be getting even littler real soon. "After this, I'm gonna fuck your brains out. You think your warm-up prize was good? Try me after this. You'll hardly even remember it after I'm through with you." Brag. She groaned as the telltale magical buzz started running up her legs, wired to concentrate on her needy cunt. Already her body was expanding, squishing more and more Thunderlane under more and more Rainbow Dash. She flitted her wings to keep the better part of her new weight off him. Didn't want to spoil the surprise too soon.

Thunderlane didn't seem to notice or care. In fact, he was eating her out with more energy than ever. Clearly her dirty talk was turning him on.

"I'll get your wings so stiff, you won't be able to fly straight for weeks." Brag. Bigger. "Mm, oh, yeah, that's good. Take every last inch you've got and then some." Brag. Even bigger. "And, mmph, if you think you can just fill me up like some other mare, you've got another thing coming. I can take any cock this side of Cloudsdale, and I'm going to milk you dry." Brag, brag, brag. Big, bigger, biggest. She could feel herself swelling with every rhythmic contraction of her pussy, every brush against her pleasure button.

"Almost there! Keep going! Faster!" She kept him on as her head rose higher and higher into the air, hefty ass billowing outward. The only thing that could break her bragging streak was Thunderlane's raging boner finally brushing against her titanic rear end. She was big enough now to straddle him front to back, and he was still lapping at her heaving cunt like nothing had changed. It was hard to imagine what it must have felt like to him down there, trying desperately to satisfy a pussy that could only get bigger, wetter, hotter with every boast. Mm. One more would do it. That was all she'd need to push her into the best orgasm ever. She took a breath...

But, no, biology itself betrayed her. Thunderlane took a moment to suckle on her newly-engorged clit, and the resulting jolt of raw pleasure threw all motor control out the window. Her wings gave out, burying him under the full weight of a mare three times his size. "Oh, jeez!" In the split-second after her wings gave out, Dash shifted to get off him. A split-second later, her pussy lurched forward and took his face in whole. "Oh. Ooooh."

The world seemed to go fuzzy, lost in moans and blissful sighs as Thunderlane's head slipped inside her. She was dimly aware of him struggling beneath her, tiny hooves pounding against her massive thighs like a wet sponge against concrete. He might have managed to push a regular-sized Rainbow Dash off him, but the new, bigger Dash was immovable. His tongue had gone from passionate to desperate, reaching deeper and deeper inside her as his oxygen ran out. He might have been shouting something, too, but if he was, her soaking pussy easily absorbed the sound waves, translating them only as a pleasant vibration.

It felt good. Real good. Almost unconsciously, she breathed out one last line: "And I'm the only mare in the world who'll ever come close to drowning you in pussy." Brag. Her vision went white as Twilight's magic ran up through her core, finally pushing her over the edge. Her pussy contracted like a vice around Thunderlane's muzzle before finally ejecting him in a flood of marecum. No doubt the ride of his life. It took her a minute to realize she was still screaming as Twilight's magic finally died down and her orgasm reached an end.

She climbed shakily to her hooves, still basking in the glorious afterglow of the best orgasm ever. Thunderlane was still lying down, halfway pressed into the cloud, gasping for breath and sputtering out globs of her juices. "You okay, Thunderlane?"

"Y-yeah," he got up to his hooves as well, still wiping her fluids from his face. When he was finally convinced he was clean, he chanced looking up at her. And up, and up. He shook his head. He pinched his cheeks. He slapped himself, for al the good it did him. She was still tall enough to look down on him like a colt. Maybe taller. "Dash!" he gasped. "You're—"

"Pretty big," she finished for him, sighing. Her heart still hadn't slowed down, and she could already feel a renewed warmth down in her nethers. Winking, dripping. Hungry for more. She gave him a smile, like a cat would at a canary. "You wanna go again?"

Thunderlane bit his lip and backed away. "Nice of you to offer, Dash, but... uh..." He looked behind him. "I think I hear Rumble calling!" And like a bolt of lightning he was gone.

Dash shrugged. Not like she couldn't catch him, if she'd really wanted, but Thunderlane was too small for her now anyway. Eleven inches only went so far at her size. She was a big mare now, and she had big needs. A glance back toward Ponyville told her all she need to know about where to go next. Yeah, there were plenty of stallions for her back in town. And if one wasn't enough to handle her, well — she could always go for quantity over quality. She licked her lips, picturing a team of stallions struggling desperately to get her off as she swelled even bigger. Oh, the look on Twilight's face would be priceless. She nearly came again just imagining it.

"Yeah." She nodded. Back to Ponyville. Where she could enjoy her new size, and every pony in town would be able to see just how much she enjoyed it. Snooty, uptight princesses included. She flapped her wings, great gusts of wind filling the air as she rose upward. "Ponyville, look out." She grinned. "Here I come."

I Can Do Anyone Bigger Than You

It had been a long day for Twilight Sparkle. Organizing your very first town festival as a princess took a lot out of you. You had to dot all the i's and cross all the t's, and check on the tasks you delegated to make sure other ponies hadn't dotted their t's or crossed the i's. It was exhausting. It wasn't at all like the Summer Sun Celebration, where ponies had learned how to prepare for it from their grandparents, who'd learned from their grandparents, and so on. This festival was brand new, and attention had to be paid to every detail.

"We'll have to remake it," she sighed. "The whole banner." It pained her to say that, but she was in charge, and it was her duty to make the tough decisions. How could anypony take this festival seriously if the lettering was a gaping five millimeters off-center? How?

The banner-makers groaned as they rolled up the banners and trotted off, muttering under their breath the whole time. It was hard to feel too sorry for them. Especially not after that lettering job. Twilight had the deepest of sympathy for being told to redo something — she really did — but they most certainly weren't warranted in calling her a 'wound-up bitch.'

Thank Celestia alone Rainbow Dash hadn't been there to hear that. No scale in Equestria would be able to measure the size of her ego if she'd heard somepony agreeing with her.

"I am not wound-up," she huffed, rubbing her thighs absently together. So what if she hadn't gotten any lately? So what if she'd been too busy coordinating the festival to spare any time for personal matters? What did that have to do with anything?

Although... She paused a moment as a slight, tempting twinge sparked between her legs. Maybe it wouldn't hurt to take a short break to ease some of her stress. The overall benefit to her psyche would qualify as improving efficiency, wouldn't it? Making the most efficient use of time could only be a good thing... Her horn sparked, the light purple glow of her magic almost touching her lips before she caught herself. No, no, no! She had to see this project through to the end. There'd be time enough for pleasure once she was finished with business.

And speaking of business, she could only hope Cloudchaser was sprinting toward her with good news on the weather. The pegasus skidded to an impressive stop just in front of her, and greeted her with a half-hearted salute.

"Problem!" she burst out, between gasps. "Big! Real... real big!"

"What kind of problem?" Twilight cocked her head, eyebrow raised. It didn't exactly take a genius to clear the skies over the Ponyville market. "How big, exactly?"

"Pretty big." Cloudchaser made a face. "I think you need to come see."

"Okay, okay." Twilight groaned. There were exactly one hundred and eighty-two other things that needed her supervision today, and she didn't have time to waste on Cloudchaser's mistakes. More than likely somepony had gotten themselves stuck in a cloud, or a cloud had gotten stuck in somepony again. At least Rainbow Dash wasn't around to make things even wo—

She bit her lip. Where exactly was Rainbow Dash?

No. No, Rainbow Dash wouldn't have caused any more trouble today. If not out of the goodness of her heart, then because she was currently learning a valuable lesson about bragging. No, surely it wasn't Rainbow Dash. It had to be something simple and small.

The two of them paused as a tremor shook the ground. A rhythmic thump-thump-thumping that sent a shiver up Twilight's spine. Okay, it wasn't small. But it could still be simple. She just had to hope. And she did hope, right until they rounded the corner and she realized where Rainbow Dash had gone.

In a word, Rainbow was big. Huge, even. She stood about as tall as the market's second-story windows, serviced by a small fleet of pegasi. "Mmm," she purred as they worked and stroked her stiffened wings, nearly the size of parachutes. The ground trembled with another thump-thump-thump as her hooves tapped against the ground. "Good job, guys," she groaned, stretching herself out. "You're almost as good at this as I would be."

And with that, Dash went from being a big problem to being an even bigger problem. The pegasi preening her wings struggled to hang on as Dash's body stretched taller and taller into the sky, her head beginning to peak over rooftops. Droplets of wet, sticky arousal rained from her engorged pussy, the ground shaking lightly as her moans grew even deeper and louder. She grinned and turned her head, looking expectantly at her — for lack of a better word — pleasure slaves. "Keep it up."

Twilight needed a moment to pick her jaw back off the ground, and a moment longer for her blush of arousal to dissipate. Whatever was causing Rainbow Dash to grow like this, she was clearly enjoying it. Very clearly. She flapped her wings and flew up into the sky, shouting as loud as she could to make sure she was heard. "Alright, alright, I've seen enough. Everypony get back to work, this instant!"

None of the smaller pegasi felt like arguing. They split and scattered in every direction, almost as though hoping it would keep them from getting caught. Though, whether they were more afraid of Princess Twilight chasing them or a ten-times size Rainbow Dash, she wasn't sure.

The shout had even been enough to shake Rainbow from her pleasure trance. A giant purple eye opened, annoyed, and focused itself on the relatively tiny purple pony. "Spoilsport."

"Spoilsport?" Twilight spluttered. "I'm the one causing problems? Rainbow Dash, look at you! You're huge!"

"Duh." Dash fell back onto her massive haunches, the buildings around her shaking uneasily on their foundations. She rans her hooves idly over her body — chest, flank, and even quick dips downstairs — as if wanting simply to feel her titanic new body. "I have to hand it to you, Twi. You really outdid yourself with that spell. I can't remember the last time I felt this good."

The spell! Everything clicked in Twilight's mind with that single piece of information. Something had gone wrong with her spell! It wasn't merely making Rainbow's head swell bigger, it was making all of her swell bigger. She grimaced as she processed the consequences of that single, critical error. Not only had she failed at teaching Dash a lesson, she'd given her an incentive to keep bragging, and bragging, and bragging without end. The image of a gargantuan Rainbow Dash, eying Canterlot mountain as a dildo, ran unbidden through her mind. "Oh no."

"Oh yes!" Rainbow shuddered, seemingly more focused on her own pleasure than Twilight's dilemma. She worked a hoof back down between her legs, and this time she kept it there. "That's the stuff."

Twilight shook her head. Hard as it was to not be distracted by Rainbow's total lack of modesty, she had to remain focused. Dash's abuse of her miscast spell would cause a lot of trouble if left unchecked. Thankfully, she never learned any spell without an understanding of the proper counter-spell. She primed her horn and launched the counter-spell straight at the overgrown Dash. Hard to miss a target that large. She could only pray it worked.

The magic hit Dash square in the chest, diffusing across her body before fading entirely. Far from shrinking back down to size, Dash seemed to swell even larger. Skin stretched and bones cracked as she grew, her eyes fluttering with pure pleasure. Her hoof worked faster and faster, spasms running through Dash's body as her orgasm built, right until a long, piercing scream shattered every window in the area. A gush of warm marecum ran from her love tunnel, coating the streets in her own slippery juices.

Dash sighed, content in the afterglow. "Got any more of that, Twi? I want to do that again."

"Well, too bad! We're not going to do that again." Most definitely not. She hadn't been prepared for the counter-spell to not only fail, but to make the problem even worse. At a rough guess, her original spell had only grown in power and potency alongside its host, overwhelming any attempt at countering it and converting the magic into more raw growth... and pleasure. She winced, realizing that she'd have to find a way to subdue the enormous Dash without magic.

"Fine," Dash shrugged, stretching out for round two. "I can handle it on my own."

Think! She tapped her head and racked her brains, trying to come up with a solution. It was already tough enough to devise a plan, and Dash wasn't helping matter. Her breath came in gustlike gasps, hot and heavy, low moans already rumbling as she stroked her oversexed pussy. Twilight tried not to blush, even as she felt a trickle of warm wetness run down her own leg. Definitely distracting.

Still, she was experienced in thinking under pressure. An idea hit her: the spell powering Rainbow Dash's growth was itself powered by pure ego. If she could only find a way to burst Dash's bubble — let out all that hot air — the spell would be broken and she'd shrink back to normal size! Genius! She nodded, proud of herself for coming up with such a simple and elegant plan. The only problem, of course, was how to bruise Dash's ego when she was bigger than a dozen of her put together?

"Rainbow Dash!" she shouted, loud as she could manage and still only just over Dash's lustful panting. "I challenge you to a competition!"

Dash's stroking slowed to a stop. She cracked an eye open, grinning. "Yeah, short stuff?" she snickered. "Sure you want to do that? You know I can beat you at anything." A groan as she stretched even larger. Where before Twilight had been flying at eye level, she now hovered around Dash's shoulders. Once again, Dash could look down on her. "Just name it."

"Uh..." Twilight hadn't thought quite that far ahead. A race was definitely impossible. Lifting something heavy was a sucker's bet against a giant-sized pony. There had to be something that wouldn't give a gigantic Dash the advantage, but coming up with the right contest was even harder in the face of Dash's overwhelming confidence. She gulped as Dash licked her lips, a predatorial gleam flashing in her eyes. "Well..."

"Time's up!" Dash boomed. "Don't worry, Twi. I've already got a great idea, and you're so wound up, I think you'll like it too." She laughed, so loud now that Twilight had to cup her hooves over her ears. "A get-off. Both of us masturbate. First to blow wins."

There were no words for Twilight's horror. "You can't be serious!" Her eyes widened to the size of dinner plates. "You can't possibly expect me to accept that!"

"No skin off my bones if you don't." Dash shrugged. "I'll just stay here, then. Growing..." She leaned back, reaching a soaked hoof slowly back down toward her most private parts. "...Enjoying myself."

"Okay, okay!" Twilight groaned. She'd regret this, she knew she would, but she absolutely couldn't let Dash get any bigger. A quick glance around told her that there were no bystanders, at least. All frightened off by Rainbow Dash. Nobody would have to see her masturbating. "Deal."

"Deal." Dash nodded, satisfied. "And since I'm so nice, I'm going to give you a half-minute headstart."

"Gee, thanks," Twilight muttered, landing softly on the ground — well away from the results of Dash's previous orgasm. It wasn't impossible for her to win this. Rainbow Dash's libido seemed nigh-impossible to fully sate, but she'd have to lose steam at some point. And she'd be starting from behind. Twilight could feel the dampness growing between her thighs, her pussy already anticipating some much-needed attention. Yes... She could do this. "Ready... Set..."

"Go!" Dash's voice boomed.

And off she went. Her horn lit up, readying a host of her favorite pleasure spells. Perhaps she hadn't been 'getting any' lately, and she'd never quite done this outside, but she was no stranger to relieving some tension. A light purple glow surrounded her clit, massaging it with a soft, ethereal touch. Like the warmest, most wonderful breeze against her sensitive button. A similar spell targeted her wings, kneading and massaging the tensed-up pinions like only the most skilled hooves could. Oh, Celestia, that felt decadent. She sighed in pleasure, lowering her hoof tantalizingly toward her now-steaming nethers. The piece de resistance.

She quickly found her most favorite spots and her most favorite rhythm, guided by her own magic. With her hoof working her succulent folds and her magic handling everything else, she could think of no better description for the experience than heaven. Maybe she had been a little pent-up, the stress oozing from her body with every rub, knead, and schlick. Pants, gasps, moans. Oh, yes, she'd needed this, and finally, she had the opportunity to do it. It didn't hurt that it doubled as a way to bring Dash down to size. Thoughts of Rainbow Dash shrinking down, devastated that she'd lost to Twilight after bragging so much... even going so far as to admit she was wrong and beg for Twilight to teach her the art of self-pleasure. Those formed the core of her fantasies as she edged steadily toward her peak.

Then came the earthquake.

"Time's up!" Dash announced, plummeting to the ground somewhere behind her. The shaking earth broke Twilight's concentration, breaking her flow and shorting her magic at a critical point. If she didn't know better, she'd have sworn that was Dash's plan. From behind her, Dash snickered. "My turn."

A moist, foglike heat blew over Twilight's back as Dash got to work, the wet squelch of hoof against pussy magnified a hundredfold. Twilight tried to block that out as she refired her pleasure spells, sinking back into their magnificent touch. She tried not to think about Dash pleasuring herself behind her. How her engorged, throbbing clit had to be the size of Twilight's head, and her pulsing cunt big enough to swallow a pony like a snack. How much bigger she'd get if she'd won here, with nopony left to keep her growing desires in check...

Twilight stroked herself desperately, urging her body forward into orgasm, but it felt nowhere near as good as it had before. Where previously her ministrations had been for pleasure and victory, she was now petting herself out of fear. Fear that only seemed to grow as Dash's moans boomed louder and louder. Still, victory was in sight. The fantasy was no longer there, but her body responded to sheer stimulation. She had the headstart. She had the advantage. If she could only keep going, she would surely beat Dash over the finish line.

"How're you handling down there, Twi?" Dash asked, practically singing. "I'm doing great! I could have finished now, if I wanted, but there's no point in winning without a little — mm — challenge."

Twilight growled, eyes closed as she ignored Dash's egotistical, self-indulgent... bragging. Her eyes snapped open. Oh no. She could practically hear Dash stretching, smell the thickening heat of a growing pegasus' arousal. Sounds of dirt shifting roared around her as Dash's massive flank swelled into the earth, bulldozing everything in its path to make room. Dash sighed in contentment. She was clearly enjoying this so much more than Twilight was.

"Maybe you should learn to relax a little, Twilight." Dash's voice boomed even louder than before. Harder than ever to ignore. "You put a curse on me for a little friendly teasing, and what did that get you? I know what it got me. I'm already the biggest — unf — fastest — oh! — sexiest pony in all of Equestria." There was a rumble as the spell prepared to grant Dash her greatest growth spurt yet. Sunlight disappeared as Dash's titanic form loomed over her, the air boiling as her needy cunt radiated heat like a furnace. A shiver ran up Twilight's spine as something warm, wet, and sticky began pooling around her haunches. She dared not look back, but she could almost see the grin on Dash's face. "And — oh, fuck yes! — and... get this: I'm getting... even bigger."

The scream practically blew out her eardrums, and definitely shattered every window in Ponyville. Twilight turned around just in time to see Dash's spasming pussy, big enough to take a train whole, unleash a torrent of piping hot pegasus juice. There was no resisting the flood, the sticky slime carrying Twilight a ways before it finally ran out of momentum, leaving her gasping and spluttering in a pool of Dash's fluids. And Dash hadn't even seemed to notice. Oh, the humiliation.

"Too bad, too sad, Twi," Dash sang, getting up and dusting herself off. Where before she'd stood just barely taller than the market buildings, the new and improved Dash towered over them. It wouldn't be long soon before she could step on one like a soda can. "Guess that'll teach you not to curse your own friends. Although..." She stuck one of her massive hooves down, Twilight's soaked-through body peeling easily off the ground. "We still have plenty of time to hang out." She chuckled, sticking the exhausted Twilight to her carriage-sized cutie mark. "Why don't you stick around for a while?"

And as the titan-sized Dash trotted off — thankfully away from Ponyville — Twilight finally had a moment to catch her breath and reflect. There was nothing she could do about it now. The festival would have to be cancelled, her schedule would have to be put on hold. For the first time she felt... oddly free. Dash was still approaching the size of a mountain, and she was currently stuck to her flank in a humiliating position, but the spell would wear off sooner or later on its own. In the meantime, there was no thinking to do, no planning to coordinate... nothing but whatever Dash decided to do with her next. It was almost liberating, in a strange, sexual, giant-monster sort of way. She coughed, sputtering up the last of Dash's orgasm. "Rainbow Dash, where are we going, exactly?"

"My place," said Dash, the earth shaking with every heavy step. "You taught me a lot about bragging, Twilight, but I think I could still teach you a few more lessons about loosening up. You know I'm such a great coach, after all." Dash's hefty ass stretched even bigger under Twilight, shaking and rattling her against a mass of muscled flank. Enough to give her an upset stomach, but not nearly enough to unstick her.

She sighed. Oh well. To the victor went the spoils. Whatever happened next, whatever crazy scheme Dash had in store for her... she'd just have to think of it as a learning experience.