The Scientific Study of Sex and Size: Moondancer's Kinky Research Project

The Scientific Study of Sex and Size:

Moondancer’s Kinky Research Project

Part 2

Princess Celestia coughed politely. “If you could stop, um… fellating yourself for a moment, I’d like to talk with you.”

Moondancer considered the request. She didn’t really want to, but she also didn’t want to be rude. And besides, when meeting royalty, there was protocol to observe.

Giggling, Moondancer pulled herself off with a wet POP, switching instead to idly stroking herself. “Hello, Princess—mmh—Celestia! I’m Moondancer! S’an honor to meet you… woooow, your wings are prettttyyyy! I like how the feathers wiggle—hee hee! Wiggle... that’s a funnnny word.”

Immediately, Celestia noticed the unfocused look in Moondancer’s eyes, lilting slur in her voice, and how she was teetering back and forth. Pursing her lips, Celestia scanned the massive mare, quickly detecting the magic wreaking havoc on her. Said magic seemed to be caught in a positive feedback loop, but the specifics of what, or how…

Celestia’s eyes went soft. “My dear pony, what’s happened to you?”

Moondancer smiled goofily. “Twilight said I was too mmmmuch of a—mmmyes—shut-in! Can you believe that? Cast this spell on me so I would make some frieeeends… didn’t go quite as planned… h-hey, is your mane actual hair, or is it just sunstuff? I’ve always—unf—always wwwondered about that...”

Celestia did a double-take. “Twilight Sparkle did this to you? Princess Twilight Sparkle? My former student?”

“Yep!” Moondancer held her free hand out in the air, measuring how big it was compared to Celestia. She guessed that the princess could comfortably rest in her palm, maybe even lay spread-eagle if she grew a little bit more. “Wasn’t very nnnnice of her, was it? Heh, you might even say... it was a d-dick move. Joke’s on heeerrrrrr, though! I like the dick! It’s so b-big and hard and warm and yummy… an’ when I tried to get rid of it before, it just made me horrrrrny. I don’t mind sssso much now, though. I’m just I’m gonna study all I want, so she can go sssssoak her head for all I care! I’m g-gonna study and study and study, and I don’t care if I get bigger… and bigger… and bigger...”

Celestia resisted the urge to facepalm. This could get bad, very fast. She continued to scan Moondancer for some clue on what was wrong with the spell, but it’d take time to pick it apart.

“You need to control yourself, Moondancer,” Celestia said. “I know it’s hard, but you have to resist whatever urges you have. This spell is only going to get worse if you don’t.”

Moondancer leaned against one of the buildings behind her, reveling in the way it gradually gave way to her increasing weight. ““I knoowwwww, but growing feels so g-good, and my boy parts feel so full! I just wanna cum, Princess Celestia! I c-can’t help it! I gotta… goTTA... GOTTA CUMMMMM...”

Celestia cursed as Moondancer slipped back into delirium. Leave it to Twilight to make a mess as bad as this. Celestia was pretty confident she’d be able to nip this in the bud, but it'd be hard to do alone—

“Sister!”

Celestia turned to find that Luna was flying towards her with an alarmed look on her face. It was rather clear that she’d just woken and had hurried here in haste, as she was wearing only a simple night shirt and pajama pants.

Celestia sighed in relief. “Lulu, good. I think I need your help here.”

“I saw the substance that hit the castle! What’s—” Luna stopped and beheld Moondancer with no small amount of awe, watching as the giantess noisily resumed her self-blowjob. “Oh my... erm, well, this is certainly a surprise. Wait, does… does she have a dick? Is she lactating?! How in the—SHE’S STILL GROWING?! What in heaven’s name?!”

“MMMMmmm…” Moondancer hugged her twitching stallionhood while fingering her unattended cunny. Her body glowed again, she shot up past both of them to reach sixty feet in two potent surges.

“We need to figure out the counterspell,” Celestia said in a hurried voice. “The whole city could topple off the mountain at this rate!”

Luna nodded. “Understood.” Her horn flared to life as she scanned Moondancer like Celestia had. “Hmm, quite the mess here, I see. Tricky… well, I would guess that nothing short of an anti-magic zone is going to stop this, Tia. A counterspell will be too finicky, and anything more complicated is going to take too long.”

Celestia pursed her lips. “An anti-magic zone is a gamble. If the casting gets interrupted, we might just end up making her worse.”

Luna shrugged. “Perhaps we could sedate her? See if that stops it?”

“How?” Celestia asked. “She’s got enough magic going haywire inside her already, and it’d a whole truckload of sedatives to put her under. There may not be enough in all of Canterlot!”

Luna lightly punched her own head. “We could knock her out.”

Celestia gave her a flat look. “No.”

Luna threw up her hands. Well, it’s either one of those things, or we go get Twilight Sparkle. But that’ll take at least half an hour, and who knows what this situation will be by then? This pony might outgrow the whole mountain!”

Celestia weighed their options for a moment. Which wasn’t easy, by the way, what with the smell of cum permeating everything, the buzz of magic pressing in on her, and the constant sucking sounds coming from Moondancer. She didn’t like what Luna was proposing, but she didn’t really have any better ideas, either.

“Okay, let’s split up,” Celestia finally said. “I’ll get the girl out of the city, and try an anti-magic zone on her. You go tell Twilight the situation and bring her here. Regardless of whether or we need her help or not, she still needs to explain herself for this.”

“Agreed,” Luna said. Her body began to dissolve into a sparkling mist. “I shall return shortly. Good luck.”

She sped away in a vaporous cloud, making a beeline towards Ponyville with all possible haste. Celestia watched her go, then turned around and gathered her own magic, her horn glowing a beautiful gold.

“Moondancer!” Celestia called out. “Child, I’m going to move you out of the city, all right? I need you hold still for me.”

It wasn’t clear whether Moondancer actually heard her or not, so focused she was on bringing herself to climax as soon as possible. Regardless, though, her efforts weren’t requiring her to move much, so it more or less worked out.

With divine magical strength, Celestia picked Moondancer off the ground in her golden aura, as gently as one would lift a newborn. She made sure that Moondancer was high up enough that she would clear the surrounding buildings, then flapped her wings and led the way.

Meanwhile, oblivious to what was going on, Moondancer resumed her internal monologue as she made her way back down to her medial ring.

Preliminary tests show that autofellatio feels really, really, REALLY good! I can’t stop getting myself off, and it only keeps feeling better! I’m currently trying to see how much of my dick I can swallow, personal best is almost half. Throat feels nice and tingly right now, too, which is helpful. Spell might be suppressing gag reflex? Not sure. Also, can’t BELIEVE how good my precum tastes. Books said it wasn’t supposed to have a taste at all... ooh! At medial ring now. Wanna suck it so bad… gonna try now...

Moondancer ran her lips along the edge of her thick, spongy ring. She bobbed a few more times for momentum, and then, jaw creaking, she pushed over it and squeezed it into her mouth. She let out another delighted squeal and put her hands behind her own head, holding herself in place to make sure she kept the sensitive ring in place.

Oooohhyesyesyesyesyes… forany connected undirected graph G with maximum degree delta the chromatic number of G is at most delta unless G is a complete graph or an odd cycle in which case the chromatic number is delta plus one—for every four mutually tangent circles the radii of the circles satisfy a certain quadratic equation—the definite integration of a function is related to its antiderivative and can be reversed by differentiation—the definite integral of a function can be computed by using any one of its infinitely many antiderivatives—the spectrum of a square matrix is bound byyyyyEESSS...

Celestia felt Moondancer getting heavier. She looked back and nearly yelped in surprise, as the space between them was now rapidly dwindling. She realized that Moondancer must be able to trigger the spell just by thinking, most likely about things related to studying, and there wasn’t much she could do to stop that.

“Blast it.” Celestia doubled her pace and sped them both down to the base of Canterlot Mountain. They landed together on the edge of a hilly plain with sparse trees and wetlands, and upon setting Moondancer down, Celestia immediately began preparing the anti-magic zone. She worked as fast as she could, but it was getting harder to keep her footing thanks to the combination of milk, pre, and saliva turning the immediate area into a swampland. In addition, Moondancer’s balls were directly in front of her, and they had to each be the size of a house. The tantalizing, musky aroma emanating from her sack was immensely distracting, but hot and bothered or not, Celestia pressed on.

Moondancer was swiftly approaching one hundred feet tall. She could feel her muscles bulging, her bones lengthening, the earth cracking beneath her spreading rump. Her skin felt warm and shivery, and the little shudders sent vibrations through her thirty foot marecock, making it twitch in her mouth. She could feel her balls starting to tighten again, that roaring fire inside her reaching a fever pitch, and she was so close now that she couldn’t stop now if she tried.

Celestia finished making the array. She stole a glance up, up, up at the colossal Moondancer, whose quickening grunts and gasps indicated a coming storm. Her unseen vagina could probably swallow a train, now. Her titanic breasts were raining down milk all over the place, and the area around them was already starting to flood. She was so big now that Celestia didn’t even come up to her ankles, but that comparison wouldn’t last very long.

Celestia rose back into the air to get a better view. Everything was in place, and the spell was ready to be cast. All she had to do was say the incantation, and provide the necessary power. Easy enough. She waved her hands and began chanting under her breath, the flow of magic increasing steadily around her.

Moondancer was right on the edge. Her loopy mind was still buzzing from the spell’s last activation, and it was probably for this reason that she decided to try a change of pace. Before her dick started to flare, she pulled back, released it from the confines of her throat, and began thrusting her hips into the air while squeezing a breast with one hand while tugging her scrotum with the other. The sudden change gave enough stimulation for her to finish, but more importantly, it also caused her dick swing around all over the place, essentially turning it into a free-aiming cannon.

Celestia was hovering in midair, aglow with power and about to utter the final word of the anti-magic zone. She funneled the considerable magic into the array...

...until she found herself staring down Moondancer’s rumbling urethra.

“Eep.”

SPLORCH

The mighty torrent of jizz hit Celestia like a battering ram. She was sent flying deep, deep into the wetlands, allowing the raw magic to go unheeded. The lines of the array became bright as the sun before blinking erratically, losing all cohesion and siphoning their power into the nearest available target…

…who was cumming harder than she ever had in her life.

Moondancer’s cries of ecstasy became louder, rising in pitch as the unrefined energy mixed with the conglomeration inside her. Her pleasure skyrocketed to new heights instantly, turning her arousal from a lusty fire, to an all-consuming inferno. Her body glowed magenta once more, the growy warmth stronger than ever, and she embraced it with an eager howl.

“More…”

The growth came in waves. It started off small, the first few spurts only making her shoot up about a dozen feet each. Those waves quickly got stronger, though, building strength like a rising tide, and it wasn’t long before she was growing in spurts of twenty, thirty, then fifty feet.

“More, more, more…”

She became two hundred feet tall in less than a minute, then four hundred in half that. Seven hundred was barely even a milestone, and one thousand was much the same.

“moremoremoremoremoREMOREMOREMOREMORRRRRRE!”

It was only when at fifteen hundred feet tall that her growth slowed down. And all the while, her orgasm continued, her genitals getting bigger with the rest of her, her fluids sailing out so far that they drenched the mountains on the valley’s opposite side. Thousands upon thousands of gallons of cum burst from her dick like an airborne river, and heavy globs of spooge fell to the ground in a downpour, painting the plains with her seed. Moondancer’s breasts added to the output to make it a triple-blast of sex, and through it all the torrent of liquid only increased, her balls and breasts bloating ever-larger.

Meanwhile, a little over a mile away…

Celestia rose out of a sticky crater. Her eyes were ablaze with a mixture of fury and shame, her anger making temperature around her rise so high, the cum literally vaporized off her body. She glowered at the titanic mare a short way away, mentally kicking herself for making such a foolish mistake, but now she also had to think of a way to adapt to the situation.

“And now she’s half the size of the mountain,” Celestia grumbled, finally giving in to the urge to facepalm. “Sun above, this isn’t good. I can’t risk trying something like that again, not while she’s so unpredictable. I guess I’ll just do damage control until Luna gets back with Twilight…”

Celestia cast a quick spell to shield herself from the deluge of Moondancer fluids, then flew back towards her as fast as she could.

Meanwhile, said mare in question had just grown to two thousand feet tall. Her balls receded a bit as they finished emptying their contents, and clarity returned to Moondancer’s eyes as she ceased her constant moans. She now looked all around while gasping for breath, trying to figure out where exactly she was.

“What… happened…” She wiped the cum off her face and examined her surroundings. There was little to nothing she recognized in the immediate area, all she knew was that she wasn’t in her house. A green and brown carpet stretched out before her that had an impressive amount of detail (or at least she thought it did, she couldn’t see very well without her glasses) but it also looked like she was outdoors… weird. She also seemed to be sitting up against a large fake boulder of some kind, and she could tell it was fake because it was starting to crumble from her just leaning against it.

“W-Where… where even am I…” Moondancer could barely think straight. About the only things she knew for sure was that she had a dick that came up to her chin, a ballsack that spilled over her lap, boobs twice the size of her head, and a very sore throat. There was cum everywhere, like a layer of gooey, newfallen snow,and there some kind of power inside her, both unstable and complex. The longer she concentrated on it, the stronger it seemed to become, and for some reason, she wanted to say that it was the reason why her head felt so strange. She also remembered that Twilight was the responsible for all of this, but considering how amazing she felt at the moment, that didn’t really anger her.

Moondancer looked down at her still-swaying penis, moving back and forth like a pendulum. Idly, she licked her lips and wondered how good it tasted… but before she could get a taste, a shift in the boulder made her come to. She tore her eyes away and struggled to her hooves, her mammoth breasts jiggling around, and her immense ballsack making her bowlegged. She could actually feel the milk and the cum sloshing inside each of them, and the sensation was oddly empowering…

“Whoa…” Moondancer steadied herself. The ground didn’t feel, sturdy either. It got stable again around her ankles, though, so it was manageable, at the very least. She blearily examined her surroundings and thought for a moment, trying to decide on what she should do.

“What... was I even doing?” Moondancer muttered. The previous hour was a blank. She felt like there was something important she was (or wasn’t) supposed to be resisting, but she couldn’t remember what it was. Her head felt like it was filled with molasses, and with her eyes barely able to focus, she had no chance of thinking straight. Nothing felt right, but at the same time, everything felt right, and she was torn between sinking back into senselessness, or trying to stay afloat.

Moondancer glanced back at the fake rock behind her. It was strange how weak it was; it practically gave away at her touch! It felt almost soft, like cork, and as her throbbing horsecock waved in the wind, she couldn’t help but think how good it would feel to—

A fresh spike of arousal hit her like a freight train.

“Ohhhhhh~” Moondancer stopped trying to remember, and instead eyed the mountain with fiery desire. She poked it a few times to make sure, and it gave way to her touch each time. It felt soft, sturdy, and deep, almost if it were made for fucking, and all it was missing was a hole to ram her mighty cock into.

Moondancer took a few steps back and widened her stance. The ground quaked and rumbled with every step, but she didn’t notice, or care. She used her telekinesis to carve out a proper hole, then took her colossal marecock in both hands and squeezed it a few times, priming it for another performance. Within seconds it was leaking drops of pre again (each ‘drop’ hundreds of gallons), falling to plummet one thousand feet to the ground below. She moved it down a bit to line up with the hold she’d just made, and then slowly, she pushed into the mountain base.

“Snnnkkkkt…” Moondancer bit her lip. The soft stone gave way to her stallionhood as though it were butter. She pushed a little harder and sank more of her tool into the mountain, reveling at how tight and snug it felt. Pre squirted around the edges of the hole that merely served to further lube her tool, making the rock face resemble a slick, sticky waterfall.

Moondancer’s tongue hung out of her mouth as her eyes crossed. “So goooooood… X equals... p-plus or mmmminus the square root of B s-squared minus the prrrroduct of A and C times four... and then all d-divided by the product of... A times two—the Battle of Ponysburg wwwwas March 18th 1463... G-General Starfire ambushed Commander Swwwwiftwing’s forces and prevented the P-Ponysburg from… getting new supplies—the Everfree C-Conservation Act wwwwas passed by a mmmajority vote of seventeen toooo—-oohhhhhhh…”

The hole was starting to feel tighter. Moondancer kept thrusting at a solid pace as she resumed growing, expanding the breach more and more to fit her girth, creating a fissure that travelled its way up the mountain. Her horn was now the same height as Canterlot itself, followed swiftly by her forehead… her eyes… her mouth… her neck…

Celestia got back just in time to see Moondancer start fucking the mountain, her humping motions setting off a full-on earthquake that shook both the immediate area, and the precariously perched Canterlot. The latter was especially alarming, as while city’s foundations were strong, they wouldn’t hold out against the spreading cracks in the rock. Realizing that her priority was the city and its citizens, she altered her flight route and flew past Moondancer, opting instead to reinforce Canterlot’s supports with her magic.

“Oh, no you don’t,” she snarled. “I’ve already lost one castle to a mare not in control of herself. I’m NOT losing another!”

“Sister!”

Celestia turned. Swooping in was Luna, followed closely behind by a somewhat-clumsily flying Twilight Sparkle. Their faces were grim as they closed with the elder princess.

“Luna!” Celestia said. “Quick! Help me strengthen the rock before the whole mountain gives way!”

Luna immediately obeyed, adding her magic to Celestia’s efforts. Twilight, meanwhile, merely stared over at her gigantic growing friend, now so big that they were smaller than fleas to her.

“Moondancer…”

“Twilight Sparkle!” Celestia yelled. “Explain yourself! How could you—”

“I didn’t do this!” Twilight said with wide eyes. “I haven’t sent any letters to Moondancer in months! And I’d never cast such a dangerous spell without the proper failsafes, let alone without their consent! You taught me better than that!”

“Tis true, Tia,” Luna said. “I found no falsehood when I searched her mind. She is innocent.”

Celestia furrowed her brow. “Then who—”

“MMMRRRRRGGHHHH…” Moondancer boomed, the mountain trembling from her voice alone. “YESSSSS... BIGGERRRRRR...”

“Perhaps we can figure out the true culprit later?” Luna suggested dryly. “When we don’t have more pressing matters to attend to?”

Celestia’s reply was faint and distant. “A-Agreed...”

“Okay,” Twilight meeped.

Celestia resumed focus on her task. “Can you can stop her, Twilight?”

Twilight gulped and tried to keep the tremor out of her voice. “The magic inside her is one of the m-most disharmonious things I’ve ever felt! If my friends and I use the power we gained from the Tree of Harmony, we sh-should be able to restore her to normal.”

Celestia relaxed a bit. “And you brought your friends with you, I hope?”

Twilight nodded. “They’re just waiting on my signal.”

“Then waste no more time,” Celestia said. “Go! Luna and I will keep the city safe.”

“Got it!” Twilight sped away on lavender wings.

Meanwhile, Moondancer had just finished growing another thousand feet, and was working on a repeat performance. Now over a half a mile tall, enough of her cock was inside the mountain that her milk-laden breasts were smooshed against the cliff-face, leaving wet, soaking indentations in the ancient rock. She’d be fully hilted in her new cocksleeve, soon, and once that happened, she could get to work on filling it up until it burst.

“AnD tHen I’m gONna KeeEEep cUmMIng,” Moondancer madly slurred. “CumMInG aNd g-gROwiNG... gRowINg And cUmiiiiiNG… nEVeR sToppPpP… feeLS tOOOooO GOOoooOoOoOOOd…”

She pushed a little bit harder, burrowing three-quarters of her marecock inside. She drooled and gave another thrust, and upon doing so, she felt an odd buzzing on the underside of her glans. Said buzzing travelled all the way up her shaft until it tickled the inside of her balls, making them twitch and spasm. Her boy parts felt strange for a few seconds, before suddenly, they started to REALLY grow, faster and larger than they ever had before!

“AHHHHHH!” Moondancer lost all control and started humping the mountain like a rabbit in heat. Her balls sagged all the way to the ground with a mighty CRASH, creating a shockwave and dust cloud that travelled out for miles. She buried her dick all the way in the rock and began pistoning in and out, utterly mad with lust. The navy blue sparkle of Luna’s spell quickly fizzled against the impossible force of Moondancer’s hips, fresh cracks spiderwebbing their way throughout the mountain.

“Agh!” Luna winced. “Tia! I think she’s broken into the Crystal Caverns! The wild magic there is pouring into her!”

Celestia gave it everything she had. “Twilight! HURRY!”

Fortunately, Twilight had just gotten to her friends. Together, they activated their Rainbow Power and shifted forms, their natural magics amplified exponentially by the energy of harmony. They rose up together in a pillar of prismatic light, their ardent radiance almost matching that of the sun. Moondancer wasn’t exactly a difficult target to hit by this point, so they didn’t bother with getting any closer than they were, staying at a safe, cum-free range.

Moondancer’s dick was now larger than the rest of her body. Her balls weren’t much farther behind, and entire lake's worth of cum churned inside each one, just begging to be released. She broke the four-thousand-foot mark with ease and kept growing faster, finding that she could look down at the mountain, now, and a couple hundred feet later, she saw that cracks were starting to form opposite from where she was thrusting. She watched as her dick broke entirely through the mountain with an explosive spray of rock and pre, and when that happened, she felt the pressure inside her cock reach a fourth fever pitch.

Moondancer pulled back her hips one final time, celebrating that relief was nigh.

BZANG!Twilight and her friends fired their harmonic blast. It travelled towards Moondancer in a scintillating surge, swift, straight, and true.

“YES!” Moondancer shoved her dick through the hole and came, sending a mile-long blast of cum sailing far off into the horizon—

ZOW! FWOOOOOOOOSH

And her world went dark.

***

Some Time Later-

“You did well, Twilight,” Celestia said from atop her throne in Canterlot Castle. “You always do. Once again, Equestria owes you and your friends a great debt.”

“Indeed,” Luna said from a throne of her own, just beside her sister’s. “At this rate, we’re going to run out of windows to put the stained glass depictions of your victories.”

Twilight’s cheeks turned a faint pink. “Erm, with all due respect, can we actually not do the stained glass thing for this one? I’d rather history not remember Moondancer as a giant rampaging futanari that used Canterlot Mountain as a fleshlight.”

Luna chuckled. “Perhaps we’ll just keep this whole incident under wraps, then. Thanks to that illusion spell she tried to cast, the cause of the tremors was never discovered by anypony. Perhaps we’ll just eliminate the evidence, and pretend this whole thing never happened.”

Celestia somehow managed to keep a straight face. “Speaking of Moondancer, you’ll be pleased to know that she’s going to be fine. Her house and belongings are in the process of being restored, and she’ll be informed of what happened when she wakes up. It’s quite likely she also will wish to pretend this never happened, so we will offer her a memory spell after the briefing.”

Twilight nodded her thanks. “It’s a shame we couldn’t recover the letter she received. I would’ve liked to examine it.”

Both Celestia and Luna nodded.

“Have you any idea who might have sent it to her?” Luna asked. “The magical signature of the original spell was warped beyond any ability to track. The postmare confirmed that it did indeed come from Ponyville, but they had picked it up from an overnight mailbox.”

Sadly, Twilight shook her head. “To my knowledge, Moondancer doesn’t know anypony in Ponyville besides me, Spike, and Lyra—an old friend of ours. We’ve already ruled me out, Spike doesn’t know any pony magic, and that spell was too advanced for Lyra.”

Celestia drummed her fingers. “Which means that somepony else was trying to frame you. Likely, somepony with a grudge.”

Twilight stood up tall and straight. “My friends and I will take them on. It doesn’t matter what they try, or how. So long as we have each other, they’ll fail.”

“Well, they’ll have a particularly hard time using deception from now on,” Luna said, snickering. “The dreaming mind sees all things, and now that I’ve an idea what to look for...”

Celestia sighed and looked out at the setting sun. “Yes, well… whoever they are, I sincerely hope that this was enough for them. I’d rather they didn’t try to strike again.”

***

In the Badlands...

“Keep shoveling!” Queen Chrysalis shouted at her drones. “We need to get them out!”

The swarm of changelings before her moved back and forth in a feverish frenzy. They used tools, rocks, magic, and anything else they could to try and clear away the rapidly-hardening mass of goo from the entrances of their homes. The hive mind informed her that similar operations were ongoing at four other hives, at the moment, and while they’d been making good progress, it’d still be quite a while before everyling was evacuated.

Chrysalis kicked at the ground, splashing musky Moondancer cum all over the nearest drones. “What a mess. That’s the last time I use a spell like that…”