Chrysalis had it all laid out.

She’d been scheming—though she preferred to call it plotting—to take her revenge on Equestria ever since that silly little princess of love had banished her two years back (not “defeated”, she maintained sullenly; turning love magic against her was clearly cheating). Finally, she was back, and she had a plan.

This time, she didn’t have an army. No; she’d learned her lesson. She wasn’t going to be anywhere near as clumsy as she’d been the last time. This time, she was going to go straight to the source. Changelings had always been better at seducing than conquering anyway. So, she’d reasoned, why not cut the nation’s government off at the head? If she played her cards right, Princess Celestia was as good as hers.

Obviously, a changeling couldn’t just show up at the Canterlot gates unannounced, and especially not their Queen. So Chrysalis had morphed herself into a particularly (she thought) attractive-looking stallion, a few inches over six feet tall, with an athlete’s build and a bulge in “his” crotch that just barely bordered on the obscene. Nopony had ever said that the Queen of the changelings wasn’t vain, no matter her form.

Gaining entrance into the city itself had been laughably easy. The last time she’d entered, she’d done so under the cover of night; she’d wanted to avoid any awkward questions (or witnesses). She’d been lucky, then, managing to steal away that foolish “Princess Cadance” without much difficulty. Chrysalis doubted, though, that getting in undercover would be that simple a second time. And besides, this time, she wanted Canterlot to know that she was there.

Or at least to know that Gleaming Blade, suitor to the Princess, was. She’d spent a whole night coming up with the name and a suitable backstory. While she didn’t have too much experience with pony cultural traditions, she’d memorized her little character and then congratulated herself on a job well done. She’d almost been miffed when the guard at the gates had taken one look at her “papers,” stamped them without even reading to the end, and then lazily waved her through. She’d worked hard on those forgeries!

Still, what was important was that “Gleaming Blade” had managed to get into the city without any complications. When she learned that she’d been accepted as a petitioner to the Day Court, she’d all but cackled in glee. Such a meaningless gesture, Chrysalis thought, a monarch deigning to listen to the moans of her subjects. Then again, she couldn’t deny that it was helpful for her own plans.  Suitors to Princesses Celestia and Luna, it seemed, were a fixture of palace life. Most, of course, were kindly turned away (though usually not without a night or two of fun in apology in Luna’s case. Even immortal alicorns, ponies said, had needs, though she’d never heard of Celestia taking one up on an offer. Odd.).

Chrysalis just nodded and grinned as the ponies around her gossiped about their Princess. Other “suitors” may have failed, yes. But none had had a changeling’s secret weapon. Between her natural love magic and the potion she’d packed away in her bags—a powerful aphrodisiac that was sure to get even Celestia more than interested in her—she was sure that her plan was foolproof.

Celestia had it all laid out.

With a slight curve to her lips, she eyed herself in her bedside mirror. One creamy white, slender hand traced a line down her hips. She found herself cupping her hand around her wide, foalbearing hips, then opening it again as she moved it down toward her thick, muscled thighs. The fabric of her dress rippled quietly beneath her fingers, but she could feel the warmth of her coat and Cutie Mark as if it were pressing right up against the palm of her hand.

She moved her hand back and put more weight on her left leg, allowing her right side to lift up an inch or so into the air until she was standing on tiptoe. Her smile broadening, she slowly rotated until she could see her long, slender fingers tracing along the contours of her rump. Whereas the most other ponies could usually aspire to was a “bubble-butt,” as a Princess, Celestia possessed a rear of truly awesome magnitude. It stuck out a good three or four inches beyond her slender waist, and she gasped when she gave it a light pinch. Her smile turned into something resembling a smirk.

She began to massage her thick, jiggling rump. It felt so good to feel her supple, warm flesh sliding between her fingers. Even with her body half-turned like this, too, she could just barely see the top of her breast shelf in the mirror. Her breasts, a pair of massive L-cups, bounced softly as her other hand fondled her protruding bust. She could feel her nipples, now erect, twitching against the fabric of her bra and bodice. With a low, throaty moan, she felt a surge of warmth playing up her spine, felt her dress growing tighter around her hips—

Hastily, she cut it off there. Her hands dropped to her sides, and a light blush appeared on her cheeks. As the Princess of the Sun, her power had a tendency to...run away a bit when her emotions were roused. Arousal, she supposed, wasn’t quite the best idea when she still had a full day’s worth of meetings before her. And to start growing in the middle of her chambers, right where anypony could see? A frown creased her cheeks. No; that wouldn’t be a good idea.

So instead, reluctantly, she turned away from her mirror, her breasts still bouncing lightly against her chest. Her custom-made bra did a good job of containing them for the most part, but she’d always found the motion they made when given a degree of freedom to be highly entertaining.

That described most of her body, really. At seven and a half feet in height, with a slender, toned body and a bust and butt most mares would kill for, Celestia was a stunner. When set free, every bit of her body jiggled, throbbed, and bounced. Held within a dress, though, every bit of her glorious figure was barely contained—hinted at, certainly, teased, but concealed.

In a way, really, it was no surprise that she was as big as she was. Even as a younger mare, Celestia had been entranced with her body. Her ascendance had merely provided the...tools for that body to reflect her opinion of herself. If asked, of course, she’d vehemently deny that she was narcissistic in any way—but, then again, a clear, innocent mind did not tend to grow a six-foot-two unicorn into a busty, seven-foot-six alicorn.

Her secret, she’d once supposed, was that she was always aroused.

Once the dress had stopped feeling tight around her, and she felt she’d gotten control of herself once more, she went to the door and called for her butler.

“Day Court first?” she asked. She was sitting in her usual oversized chair in the Royal Dining Room and sipping at a cup of coffee. As the first draught of hot liquid trickled down her throat, Celestia closed her eyes and savored the feeling of caffeine seeping into her bloodstream. Now that was what she’d needed.

“Yes, Princess.” Her butler, a youngish unicorn stallion by the name of Star Light, beckoned for the chef’s assistant to bring out the next course. Celestia brightened when he removed the metal top from the platter, revealing a platter of eggs, a muffin, and a good bit of jam. She thanked him, and set about tucking her napkin into her collar. Most ponies would put theirs into their lap, but with a bust as big as hers, she’d learned quickly that it was best to place it higher up.

“After that,” Star went on, inspecting a piece of parchment levitating beside him, “you’ll have a meeting with the visiting Saddle Arabian dignitaries, followed by lunch with the Headmistress of the School for Gifted Unicorns. After that, you’ll take tea with the Canterlot Homeowners Association, and attend a meeting of the Financial Committee in the Lower House.”

Celestia nodded vacantly, her full lips pursed as Star rattled off the next three things she’d be expected to do. She didn’t mind her official duties, not really, and it was hard to resent them when Luna had leapt back into the fray with such enthusiasm after returning from the Moon…

Still, she remembered that flicker of warmth, of pleasure she’d felt while tracing her figure in her room. She stifled a happy shiver. When was the last time she’d let herself loose? The last time she’d really pleasured herself? It must have been a good two weeks ago, Celestia recalled, in that abandoned valley near the Everfree. A smile crossed her face. She could still remember her bust heaving, her muscles spasming with pleasure as trees crumpled beneath her weight, her fingers leaving gouges in the soil deeper than a normal pony was tall as the clouds grew closer with each passing breath.

Reluctantly, she let the memory go. Perhaps some other time. Today, as were most days, was a day for responsibility. For official functions. And the first, she supposed, was the Day Court.

She finished off her eggs and dabbed at her mouth with the napkin. Then, pushing away her chair, she stood up and nodded down at Star Light. “Very well,” she said. “Let’s go see today’s petitioners.” Hopefully, she noted privately, something interesting would happen.

Chrysalis didn’t enjoy waiting.

The petitioners—she mentally labelled them as “desperate peasants” while taking care not to label herself as such—were each given a number and told to wait for their turn to address the Princess. Queen Chrysalis, however, did not wait. She was not patient. She abhorred the very thought of allowing the petty moanings of lowlife peasantry to impede her glorious plan of invasion!

She’d just about made up her mind about demanding a proper audience as befitted a conqueror—er, suitor—of her stature when she noted the stallion guard watching over the rest of the petitioners. The very tall, very muscular, very imposing guard. Just one of his arms looked around as thick as her normal-sized waist.

Chrysalis sat down and waited her turn. Fortunately, it only took another twenty minutes before her number, twenty-four, was finally called. It was for the best, really; she’d been about ready to declare war right then and there, and damn the consequences.

“Good morning,” Celestia said, smiling down at the handsome stallion walking in. Her smile faded when she realized that he was less walking than strutting, but she kept it on her face all the same—if not for the stallion’s benefit, then for the benefit of the other petitioners and the rest of her Royal Court who were in the room with her. It wouldn’t do for Twilight, who’d been seated in a throne beside her to learn about the petitioning process, to get the wrong idea about treating one’s subjects. So, as she’d done for centuries, she smoothed over her reaction and said, “Welcome to the Day Court, master…?”

“Gleaming Blade.” The stallion gave an impressive bow, the lapels and pins scattered across his dressy suit glinting in the light. “Might I say that you are truly more beautiful in person than I could have ever imagined, Princess.”

Chrysalis struggled not to grit her teeth as the words slipped out of her mouth. She hadn’t enjoyed suppressing some of her more virulent language while masquerading as that other Princess, but this...drone-worthy flattery absolutely grated on her, each syllable dripping with false honey and sycophancy. At least it be over soon.

Celestia’s forehead creased. Oh, dear. This would be one of those petitioners, wouldn’t it?

“To impress upon you my love and devotion”—Chrysalis almost choked on the words—”I’ve brought you a gift, Great Princess.” Royalty always loved a little embellishment, she knew from experience. Some extra flattery wouldn’t kill her.

“Oh?”

“Indeed.” Rummaging through “his” pockets, Gleaming Blade produced a ribbon-tied box. “The finest chocolates in the land,” “he” boasted. “A token of my affections.”

Celestia nodded to one of her guards, who took the box and carried it up to her. “Thank you, Master Blade,” she said, inspecting the box. “It’s truly appreciated.” As the stallion nodded and made his way to the side of the room, Celestia popped open the lid and, after inspecting the chocolates inside, lazily popped one into her mouth.

From behind her disguise, Chrysalis grinned. She’d done it. Celestia had downed the potion. Soon, her special potion would go into overdrive, focusing Celestia’s growing lusts toward a very specific pony—her.

“Mm,” Celestia murmured, feeling the silky-smooth chocolate slide down her throat. She had a soft spot for sweets, and a gift of chocolate was just the thing to brighten her morning.

She turned to Twilight. “Would you like one, Twilight?”

Twilight, about a foot shorter than Celestia in her own throne, shook her head. “No thanks. Spike made a really big breakfast.” She patted her stomach and grinned.

Celestia grinned back. More for me, she told herself, and popped another one past her lips before refocusing on the task at hand.

As the next petitioner came in and began to talk, though, she found her mind drifting—specifically, to thoughts of sex. She found herself eyeing the rugged physiques of her guards, of the way her bust stuck out in front of her—even, she noted with some surprise, glancing over Twilight’s alicornized figure with no small amount of approval.

This was wrong. She needed to pay attention. She was the princess, not some two-bit mare. But all the same, she found herself closing her eyes, her slender fingers drifting down between her legs. Her full lips rubbed together as her fingers found her swollen, puffy labia through the fabric of her dress. Her nipples were stiffening against her bra, the heat in her loins growing almost unbearable as she shifted in her throne.

It took Twilight a moment to realize where the moans were coming from. She glanced to her side and paled when she saw that her mentor was softly rubbing the space between her legs as she grinded her back against her chair. “Um,” Twilight whispered, “Princess Celestia?”

Celestia stifled a moan. Oh, gosh. This felt so good. “Yes, Twilight?” she murmured dreamily.

“Should you be doing, ah, whatever you’re doing?”

“Doing what?” Celestia’s fingers hit a particularly sensitive spot just above her thigh, and her eyes all but rolled back in their sockets as a wave of heat and pleasure surged up her spine. Oh, yes. She’d needed this.

Ponies in the crowd had started to notice. A low murmuring was spreading through the crowd as more and more came to realize that, yes, the Princess of the Sun was indeed masturbating in the middle of the Royal Court. More than a few shifted uncomfortably; glares, stares, and dropped jaws were par for the course. But Celestia just smiled drowsily and kept at it, massaging her warm, throbbing clit as her panties moistened.

Twilight swallowed—and then stared. Surely she was imagining it, but Celestia looked a bit...taller than she had a second ago. A bit bigger. It must have just been the way her back was rubbing against the throne, pushing her very impressive bust up a few inches more—but then there was a sizeable r-r-rip and Celestia’s bodice ripped right down the seam.

“O-ooh.” Celestia moaned, shuddering as ripples of warmth filled her body. Her dress was suddenly incredibly tight around her body, but she didn’t care. She flexed an arm and the sound of ripping, popping fibers filled the air; she flexed her growing chest and her dress simply split right down the middle.

Her long legs got longer, her thighs all but exploding from their restrictions as seven-foot-six became eight-foot-ten. By now, Celestia’s growth was evident to all but the most blind of onlookers, and more than one had begun to back away toward the door.

“Ooh, yes,” Celestia moaned, her whole body shivering as she surged up another two feet. Her dress was in tatters now, the fabric barely managing to cling to her breasts as the bottom half simply fell to the floor. Her overstretched panties were visible for the whole court to see. Damn propriety, Celestia thought, her lust washing over her like a tidal wave. Her skillful fingers continued to go to town on her needy clit. She needed this. She wanted this. And it felt so go-o-oood.

She stood up from her throne on unsteady, growing legs. Now at nearly twelve feet in height, the top of her horn reached almost halfway to the height of the throne room. Celestia shuddered as her first orgasm hit her, her pleasure peaking and sending her crashing to the ground. She landed on her elbows and knees, and the ground cracked slightly beneath her. She kept her hand firmly by her crotch, though, still masturbating fervently as she passed fifteen feet and surged onto twenty. Her moan of pleasure all but shook the room, her heaving bust dripping with sweat and arousal as the last tatters of clothing burst from her glorious form.

Chrysalis soon found herself backed into a corner by the growing goddess’ massive ass, each heaving butt cheek nearly as tall as she was. Impossibly round, and spotted with a pair of Cutie Marks bigger than the changeling queen’s head, Celestia’s ass was an enormous spectacle that both aroused and terrified her.

This wasn’t supposed to happen. She certainly hadn’t added a growth serum to the love potion—what had gone wrong? Chrysalis wanted to find a drone to punish; she needed to find someone to blame, some way to escape, to get out of here and rethink her plans.

She might have, too, if a growing and horny goddess hadn’t noticed her creeping along the edge of the wall.

Celestia noticed the attractive suitor in the edge of her vision and instantly found her every thought focused on him. Goodness, some part of her whispered, isn’t he attractive? Fun, too. “Come here, sweetheart,” she found herself purring as she reached out a massive hand to seize him around the waist…

Chrysalis grunted, squirming as the twenty-five foot Celestia seized her, rendering her helpless in her massive grip. “Look at you,” Celestia cooed, stroking Chrysalis’s chest—and then “his” groin—with a thirteen-inch finger. “I could just eat you up.”

Chrysalis’ eyes opened wide. Oh, no.

Fortunately, though, it seemed the busty goddess had other ideas. With a flicker of her horn, Celestia slipped “Gleaming Blade” out of his clothes, leaving him bare for all the world to see. Chrysalis was too terrified to unmask herself, so Celestia was perfectly happy to push the “stallion’s” crotch against her own and start rubbing—at least until Chrysalis’ leg actually slipped inside of Celestia’s enormous pussy.

“Ooh,” Celestia said, her back arching as she used Chrysalis like a sex toy. “Now that’s good.” Her breaths came faster, her chest began to heave. The heat in her loins intensified until she was regularly pumping Chrysalis in and out of her marehood, growing with every “thrust” until she’d passed thirty feet and the tops of her ears were scraping against the ceiling of the throne room sitting down.

With a cry of pleasure, Celestia threw her head back and moaned, her orgasm hitting her with the force of a freight train. Chrysalis just let out a muffled scream as waves of femcum washed over her, Celestia’s wildly convulsing walls drawing her in before spitting her back out. She hit the wall, thoroughly drenched in Celestia’s juices, and blacked out.

From her position beside her throne, Twilight felt like she was dealing with the shock rather well. “Don’t panic, everypony!” she shouted, straining to make her voice heard over ground-shaking moans of her rather over-enthused mentor. “I, uh—just file out the doors!” Sweat was running down the sides of her face. She watched Celestia pleasuring herself, blanched as her “extra-large” mentor actually seized a pony from the crowd to do so, and struggled to hold onto sanity as Celestia’s first orgasm overtook her.

“Please!” she shouted, her own chest heaving as she struggled not to hyperventilate. “Just—uh—don’t panic, and, uh—”

“Twilight Sparkle!”

“Yes, ma’am!” Twilight blurted, leaping to attention. When she recognized the speaker, though, her cheeks flushed. “Luna! What’s going on!”

Princess Luna stood by the throne room’s heavy twin doors, her chest heaving and her eyes wide. “It is an old habit,” she bit out, staring at Celestia’s growing form with awe and a slight amount of fear. “One she told me she’d broken. But if she has truly slipped this far into lust, Twilight Sparkle, then—”

A bolt of night-black magic lanced from her horn as Celestia’s arm, as thick around as an entire pony, brushed against one of the room’s pillars and sent it crashing to the ground. Luna blasted the falling architecture into dust, and then telekinetically flung a huddled group of ponies away from the blast zone and into the hall.

“Evacuate the palace!” Luna hollered. “Get everypony safe! My sister has gone  out of control!”

In a flash of magic, Twilight appeared by Luna’s side. “But—how can I do that?” she asked. “I don’t—I didn’t—” She winced as another, particularly loud moan on Celestia’s part split the air, the growing goddess adding another few feet in size. By now, she had to be nearly fifty feet tall; even leaning back against a wall with her hand between her legs, the tops of her ears were still brushing against the throne room’s ceiling.

“Find Shining Armor!” Luna unceremoniously flung another group of ponies out of the way of Celestia’s massive foot. “Perhaps he can create a shield strong enough!”

Twilight’s eyes lit up. Of course! Shining and Cadance were visiting from the Crystal Empire—they’d be able to help for sure! “You got it, Pr—Luna,” she said. With a final, gawking glance at Princess Celestia, she teleported away.

Luna growled under her breath and summoned up her magic. “And I,” she rumbled, “shall stay behind to deal with my sister.”

It wasn’t long before Twilight ran into Shining—in this case, quite literally. “Oof!” she grunted, immediately rubbing her forehead from the impact.

“Twily!” Shining’s eyes were wide. “What’s going on? I heard something happened to Princess Celestia!”

Twilight gripped him by the lapels of his coat. “I don’t have any idea how, but she’s growing into some sort of lust-driven giant! She’s going to outgrow the palace at this rate! You have to help me evacuate everypony!”

“You got it.” Cadance, a few feet behind him, looked rather ashen, but also determined. “What can we do to help?”

“Get everyone out of the palace,” Twilight said. “I can help. And then Luna wants you to try to shield the rest of the city if needed.”

Shining nodded. “Done. When and where should we start?”

A rumble echoed through the castle walls. A crack snaked down the left wall, and then—SMASH! An enormous foot, taller than any of them, crashed through into the hallway. Luna was visible through the rubble, still frantically trying to prevent as much structural damage as she could. Shining and Cadance gaped at the big and growing Celestia, who now looked to be a good sixty feet tall. The tops of her shoulders were rubbing against the ceiling of the throne room, with cracks spiderwebbing outward from the point of impact. They could actually see her growing, her entire body swelling as her massive hands went to town on her enormous, puffy clit.

“Now!” Twilight hollered. The three took off running.

Inside the throne room, Celestia just moaned even louder. The room itself wasn’t long to contain her. Already, the cracks along the ceiling had spread more than a dozen feet in any direction. Her head was bowed low to her chest, her heaving breaths forced against her enormous, pillowy bust. She let out another cry as another orgasm swept through her—and her growth redoubled with the pleasure.

The ceiling crumbled into rubble, the stone coming crashing down around her huge and growing body as the growing goddess passed seventy feet without breaking a sweat. Flashes of magic burst around the floor above as the three other alicorns teleported helpless servants and guests out of the hazard zone. Celestia, caught in the throes of growth and pleasure, paid no mind to the architecture crumbling around her as another growth spurt hit. She moaned, low and throaty, her heaving bust swelling up as she passed eighty—no, ninety feet in height.

The next floor was nowhere near as tall as the courtroom had been. It only took a few more smaller spurts, each of around four or five feet each, to put Celestia’s growing body close to bursting free. Her body spasmed in pleasure, and, seizing forward with the force of her orgasm, she caught herself on her hands and knees. Still breathing heavily, and overcome with the sensation of growth, Celestia pushed herself to her feet—and broke right through the roof.

It crumbled around her just as the ceiling had before. Ponies all around upper Canterlot, already somewhat unnerved by the shouts and rumbling coming from the palace, began to shriek and run as their massive Princess’ head emerged from the top of the East Wing. Celestia blinked down at her panicking subjects. A sliver of lucidity slipped across her mind as the last throes of her orgasm finished.

Far, far below, a woozy Chrysalis felt her hold on her transformation evaporate. Groaning, and cradling her aching head, she slowly came to. Why wouldn’t her head stop swimming? Why did it feel like someone had been hitting her head with a mallet? And what was this enormous shadow stretching over her?

She glanced up and saw Celestia’s massive figure towering over her. The princess’ dripping labia winked down at her from its place forty feet above. Chrysalis followed the curves of the princess’ legs up past her hips and big, bouncing ass, past her incredible bust, and finally up to her smiling, sighing face…

With a dramatic sigh, Chrysalis fainted again.

Beyond the walls of the palace, Celestia was finding that much of Canterlot was having the same idea. “My little ponies!” she called, her voice booming out over the city. She glanced down at the shapes whirling around her feet, and then out over Lower Canterlot. A shiver went down her spine when she realized that the wall around the palace only came up to thigh height on her now. Carefully, she lifted up a foot and attempted to place it on the other side of the wall. “There is no need to fear—”

Unfortunately, she still wasn’t quite used to her new size. She’d also neglected to fully take in her surroundings. As a result, as Celestia lifted her leg above the wall, her thigh brushed against a particularly tall crenelation. Her tight, warm muscles instantly spasmed at the physical contact, letting a small rainstorm of alicorn juices cascade over the ground below. Celestia just stifled a moan and stumbled. She landed on her knees in the middle of the wall, her massive legs gouging out a huge hole in the stone. The ground shook beneath her enormous weight, by now nearly two hundred tons.

At over one hundred feet in height, and nearly two-thirds of that kneeling, Celestia found her face at just above the heights of some of Canterlot’s taller towers. She bit her lip as lust and concern battled it out in the depths of her mind. She was still so horny—so huge—and she needed to get huger. It was a raw, compulsive need, a burning that extended beyond her loins into what felt like her very soul. Her hand trembled above the city streets, her body still steadily adding on more size at the rate of a foot every few seconds.

“Oh, dear,” Celestia said, biting her lip. She didn’t want to hurt any of her little ponies—but she was still so incredibly horny. And at this size, there just weren’t many things that could satisfy her…

Her resolve wavered just for a moment—and the lust flooded back in. “Just one little tower,” she told herself, reaching forward to snap the building off at the base.

Far below her, a panicking Twilight saw her mentor reaching for a tower. “Shoot!” she gasped. She vanished in a poof of magic.

“No time to talk!” she informed the elderly mare who’d been watching her window in a kind of religious awe. “We’ve got to get to you out of here!” Another zap of magic set the two of them outside on the streets, and a third put Twilight back in the building.

The tower shook as Celestia got her hand around it. Twilight did double-time, struggling to evacuate the tower as the gigantic goddess ached with ever-increasing need.

“Ah,” Celestia said, eyeing her new “toy” with a lazy, lusty grin. “Very nice.” She wasted no time inserting the spire inside of her burning pussy, which, around seven feet in height, wasn’t quite large enough to take the rest of the tower’s girth inside. But that didn’t stay true for long.

“Aah!” Celestia moaned, falling back onto her elbows as pleasure washed over her. Another section of the wall crumbled beneath her, and the roads started to crack beneath the weight of her magnificent body. She could feel herself growing larger and larger to make room for her toy. It slipped a little further inside each second, the tightness becoming almost unbearable as Celestia’s desires raced against her size. One hundred feet and ten feet became one hundred and fifteen. One hundred and twenty. One hundred and thirty—

All around her, ponies watched in awe as their princess added dozens of feet to her enormous figure. Her groans of pleasure shook the nearby buildings, the thumps of her thirty-foot hips shattering the streets. An idle twitch of her arm smashed through a (thankfully evacuated) tower; a spasm of her foot ripped through a pavilion.

Somewhere below Celestia’s aching thighs, Luna snarled as she dodged a crashing building. “Damnation,” she growled. “There’s only one way to stop this.”

Dealing with the more powerful, more mercurial of their celestial pair had always had a tendency to drive Celestia into an emotional frenzy whenever their magical resonance got too high. Luna had never experienced the same, but she was more than used to her sister’s habit of growth whenever things got a bit...heated.

She swooped below Celestia’s thrashing heel, which by now was taller than she was. Her sister was still growing steadily, passing one hundred and forty feet. One hundred and forty-five, now, and still growing, her enormous, pillowy breasts growing with her as her bust grew large enough to fill the entire Palace Ballroom with its mass.

Once she was set off, Luna knew, there was no stopping her. The Sun was a powerful, volatile thing, and its energies would continue to grow inside of Celestia until she found sufficient release. She’d already come to orgasm at least a half-dozen times, though; Luna winced as an earth-shaking groan of pleasure rocked the ground below her. There had to be some way to maximize her pleasure without anypony getting hurt.

Fortunately, with all of the ponies around, it wasn’t long before Luna came to an idea. She alighted beside Twilight, who’d been staring wide-eyed at the destruction Celestia had left in her wake.

“Princess Luna!”

“Princess Twilight,” Luna said. She inclined her head at the younger mare. “Is the palace evacuated?”

“Nearly. Cadance is just finishing up the rest.”

“All done!” Both princesses turned to see a third alicorn swooping down on them; a glint of magenta magic beyond the edge of the crowd showed that Shining Armor wasn’t far behind. Cadance hit the ground running and slowed herself to a stop. “We’re all clear.”

Her smile turned to a frown, though, as she turned to face Luna. “Aunt Luna,” she said evenly, “before we go any further, you need to tell us what’s going on here.”

“Yes!” Twilight burst out. She stepped closer to Luna and then paused, as if uncertain of whether to go on. At Luna’s nod, a torrent of words burst out. “Well, what’s wrong with Prin—Celestia? Is she sick? Has she been cursed or something? How can we stop her? How can we, well, help her?”

A particularly low, throaty moan rumbled the ground beneath their feet as the gargantuan goddess added another dozen feet to her size. Twilight’s cheeks blushed a bright red, and she hastily averted her eyes toward the ground.

Oh, dear. Luna pursed her lips. It appeared that Celestia had not, ah, taken Twilight Sparkle into intimacy. In the old days, it had been common, though she’d refrained from asking upon her return out of politeness. But this level of apparent discomfort was...unexpected.

She sighed, then winced as Celestia’s thrashing legs brought another building down. Most of the citizenry was out of the way, so they were fairly safe for the time being. But time was still at a premium.

“As you surely know,” Luna said, carefully, “as all mares do, my sister has, ah, needs.”

Twilight blushed even redder. Cadance just raised an eyebrow and nodded.

“However,” Luna said, “due to her emotional codependence on the Sun and its energies, it is rather easy for a state of a heightened emotional and physical sensation to lead to a resonance with the power she controls, leading to an influx of energy and, therefore, size, into her person.”

Twilight blinked owlishly.

“She gets big when she gets horny,” Cadance supplied. Twilight’s mouth formed an ‘o’. Then her cheeks flushed further, until she was as bright red as a cherry tomato.

Luna cleared her throat. “Approximately. So, Twilight Sparkle, this is no curse or spell. This growth is a part of my sister—albeit one that she usually tries to control.”

“Control?” Twilight said.

“She refrains from sensual pleasures,” Luna clarified. “She usually cannot afford to ‘let loose’ in a public area such as this. Since I’ve returned, I’ve noticed that she’s taken up a habit of doing so in far-off, isolated regions of Equestria. Of course,” she said, frowning, “in the old days, our increased stature—and, occasionally our gigantism—served to bolster the respect that ponies had for their monarchs. Nowadays, I understand that much of that respect has sadly declined.”

Twilight’s mouth was moving silently. Luna caught the words “refrain” and “pleasure.”

“So she can’t do anything?” Twilight asked. “That sounds awful.” Cadance was nodding.

“She avoids arousal, yes,” Luna said. “Unless she chooses to—or is made to—‘let go.’”

“Made to?” Cadance cut in. “But you said that this was something she chose to do.”

“Usually. But the Celestia I know would never have allowed herself to go out of control in the middle of court. No,” Luna said. “Somepony is to blame.”

Celestia let out another earth-shaking moan. Twilight actually jumped when the ground rumbled beneath their feet.

“Well...is she done?” she asked. “She hasn’t, um, grown in a while now.”

“Nay,” Luna said. “This is but a lull. If she had finished, she would be shrinking now. I fear that my sister has many more feet—or even miles—yet to grow.”

Twilight and Cadance exchanged a look. “Miles?” they said in unison. Luna looked grim.

“The best way to keep her size manageable is to help her achieve maximum pleasure,” she said. “Once her lust has been sated, her growth will cease. Until then, however…”

“She’ll keep getting bigger until she’s all sexed out,” Cadance said. “Got it.”

“So what do we—“

Twilight stopped. Her eyes got as big as saucers. “Oh, no. You can’t mean—“

“Yes,” Luna said. “We will have to assist my sister in her pleasure-making. It is a necessary thing,” she added, seeing Twilight’s obvious discomfort, “though I understand if you wish to step out. All we must do is help my sister maximize her pleasure; personal participation is not required.

“However,” she went on, almost slyly, “in my time, it was a tradition for the princess to take on a student and consort. I am also sure that she would greatly appreciate any of the efforts of her prized student in achieving our goals.”

Twilight’s mouth opened, flapped a few times, then closed. Her expression morphed into a kind of firm, though rosy-cheeked, determination. “I’ll help. What do we have to do?”

Luna told them. By the end, Cadance was nodding along.

“Are you sure?” Twilight asked.

“I must be,” Luna said. “Now go!”

The three alicorns dashed off in separate directions. Each had her mission: to gather up as many ponies as they could to please their growing princess.

Luna gathered a small squad of earth ponies and teleported them around Celestia’s enormous figure. Cadance led a team of a few dozen pegasi in pleasuring Celestia’s massive clit. Twilight, still blushing madly over the idea of actually sexually pleasing her longtime mentor, nonetheless managed to assemble a small army of unicorns to magically massage Celestia’s enormous, pillowy breasts.

Celestia just groaned with incalculable pleasure as she felt the sensation of so many tiny hooves massaging her body. Biting her lip, she peered over her erect nipples, each one nearly two feet in length, and eyed the ponies massaging her stomach, thighs, and hips.

“Ooh,” she moaned, her whole body shuddering. Thankfully, nopony was shaken off, and a few quick levitation spells ensured that nopony got crushed. “Now that feels good…”

Tiny voices rang out in her ears as her unicorn servants squished her heavy jugs together. Far from being afraid of her, they seemed almost...worshipful? They loved her size, they loved her power, they loved her raw, oozing sexuality. Celestia found herself panting as the hooves and wings of nearly two dozen pegasi worked her throbbing marehood. She let out a cry, her back arching with pleasure—and spotted Twilight Sparkle, giving into lust to help save her mentor, madly humping her swelling nipples.

That set her off. With another groan that shook the whole palace, Celestia doubled over and began to surge in size again. This time, she managed to get one foot onto the ground—and then slowly drew herself up, her orgasm surging within her as she soared past two hundred feet in height, finally settling at around two hundred and twenty feet. Now, the top of the palace’s tallest towers just barely reached her chin, and the rest of her little ponies looked almost like ants beside her feet.

Where once her inhibitions had restricted her pleasure, the sight of her subjects pleasuring her—in many cases, with their entire bodies—allowed Celestia to finally give into temptation. For the first time since she’d first broken through the palace, she allowed herself to feel her size: now almost two hundred and thirty feet of raw power, lust, and virility. With a long, drawn-out sigh, she embraced the sensation of growth, let it curl around her like a lover’s arms.

And as she inhaled, it filled her completely.

A piercing cry split the air as Celestia felt the Sun’s power rushing into her. She clutched her generous hips in her opposite hands, her wrists rubbing against her toned belly. Her massive, pillowy breasts suddenly surged in size. Relative H-cups became relative O-cups, her jugs swelling until her forearms pressed deep into her supple titflesh.

A leg over one hundred feet long crashed into another wall, bringing it crashing down to the earth before Celestia doubled in height. The comparatively tiny ponies below watched in awe as their hoofball field-sized princess crushed the massive architecture beneath her as easily as a child knocking over a sand castle. She was four hundred feet tall now, adding on more and more feet in height by the second.

Far below her, Twilight watched her growing mentor with awe. She’d fallen off of Celestia’s bust just as the princess’ growing nipples had surged as large as she was. Now, she was standing a few dozen yards away from Celestia’s ankles, the Princess’ forty-foot feet gouging out deep canyons in streets barely wide enough to contain them. Her growing body cast a shadow large enough to cover a good fourth of upper Canterlot. As Celestia added another hundred feet to her height, almost as easily as breathing, Twilight’s eyes only grew bigger.

“How big is she going to get again?” Twilight breathed to herself.

“Miles, right?”

She whirled. “Shining!”

“In the flesh,” he said. He grinned tiredly. “Cadance brought me up to speed. If she keeps growing like this, I’ll probably be brought in before long.” He jerked a thumb over his shoulder. “I already shielded one of the barracks from her royal derriere.” They both winced as a moaning Celestia, her body swarming with more and more ponies trying to pleasure her, crashed back down to Earth.

“I hope that wasn’t it again,” he said.

“Y-yeah.”

“Not that I would mind getting a view of a flank that big.”

“Shining!” Twilight said. “That—that’s Celestia you’re talking about.”

“Give me a break,” he said, chuckling. “I’m married to the Princess of Love. A stallion gets used to thinking along those kinds of lines when you’ve got a wife for whom a dozen-pony orgy is just another Tuesday evening.” He shrugged as Twilight’s mouth dropped. “And given the circumstances...I’d say ogling an ass that wonderfully huge is more than acceptable.”

Struggling to ignore her brother’s lecherous smile, Twilight yanked her gaze away from—well, if she admitted that she’d had her eyes locked on Celestia’s forty-foot Cutie Mark for the past fifteen seconds, that’d be the same as admitting that Shining was right.

Then again, no other pony but her had been humping Celestia’s nipples like there was no tomorrow just minutes before. Her cheeks flushed madly, but with her thighs already damp with arousal, Twilight was happy to just give a noncommittal grunt while hoping that Shining didn’t notice.

“Welp,” he said. He gave her a quick hug. “Sounds like Cadance is calling me. Better make sure the market district isn’t completely destroyed.” He snapped off a salute and grinned. “Later! And don’t forget—enjoy the show!”

Twilight turned back to her growing mentor, who’d added on another fifty or sixty feet in the last minute alone. She tried to forget the throbbing piece of meat she’d felt against her thigh when he’d hugged her.

He was her brother, for goodness’ sake! But...she’d never known he was that big before. And suddenly, given the context, dozen-pony orgies with Cadance didn’t seem too unappealing…

Twilight slapped herself back into reality. This was no time to be daydreaming about sex and possibly incestual orgies.

She had a giantess to pleasure. Next Chapter: Growing Pleasures Estimated time remaining: 35 Minutes