Chapter 1
White Heart rolled over onto her belly, kicking her legs and wiggling her rump in the direction of the bedroom door. She looked over her shoulder and saw Fluttershy enter the doorway, watching the smile grow on her face. White Heart flicked her tail and slapped her rump, striking the golden shield of her cutie mark, and gave Fluttershy a confident smile.
“Heyyy, Flutters,” said White Heart. “I’m all alone over here… come on over and warm up this bed for me, pleeease?”
She rolled onto her back again, crossing her creamy white thighs and using both hands to squeeze her breasts together. White Heart had a jaw-dropping set of tits, bigger and softer than any other rack Fluttershy had ever encountered. And that was saying something, since Fluttershy herself had a set of unreal boobs. When White Heart had arrived in Ponyville, Fluttershy’s chest was outclassed for the first time in her adult life… and looking back, it only seemed natural that the two bustiest girls in town would end up together.
“You can rest your head on my chest, Fluttershy,” beckoned White Heart. “I know these are your two favorite pillows~”
Fluttershy blushed so hard that she momentarily felt lightheaded. She couldn’t resist White Heart’s tits; she could barely keep herself from groping her boobs when the two of them were in public. It didn’t get any easier when White Heart intentionality seduced her, either. She loved to hug Fluttershy from behind and smoosh her breasts against the pegasus’ back… or to give her tits a nice hard shake when she knew Fluttershy was looking… or even to lift her shirt and flash Fluttershy when no one else was looking.
White Heart had been especially naughty today, and Fluttershy had spent the afternoon so horny she could barely think. She’d wanted to rest her head on White Heart’s boobs for hours, and she wasted no time in joining her girlfriend on the bed. She fell into White Heart’s embrace, sinking face-first into her cleavage as White Heart ran her hands over her shoulders and stroked her soft feathers.
White Heart’s breasts were twice the size of Fluttershy’s head, so there was plenty of cleavage to fall into. A warm, inviting darkness swallowed Fluttershy as she descended, and she lay there - embraced by White Heart’s bosom - and felt her mate’s slow breath. White Heart stroked her hair and kissed the top of her head again and again, finally coaxing her to lift her head and accept a kiss on the lips. White Heart’s tongue was gentle but insistent, probing deeper as Fluttershy moaned.
Fluttershy’s body had spent most of the day in a state of intense need, and now that need was close to its absolute peak. Her pussy was crying out with each beat of her heart, darkening her pink panties with a growing dampness. All she had to do was ask, and White Heart would touch her, taste her until she had the satisfaction she craved… but there was something else she wanted, something that she didn’t know how to ask for. Sometimes the words slipped out, though - and now that her lips were locked with White Heart’s, she let herself mumble those secret desires. But when White Heart pulled back, those unintelligible mumbles become a whisper:
“Mmmff… fuck your titties… White Heart… big hard cock…”
“What’s that?” asked White Heart.
Fluttershy had been perfectly relaxed, her body almost melting into White Heart’s… but now she tensed up, suddenly aware of the fact that she’d spoken aloud. She rolled off of White Heart and lay face-up on the other side of the bed, avoiding eye contact with her mate. “Oh… nothing,” she said. “I think I was just mumbling…”
White Heart reached over and caressed Fluttershy’s belly, tracing a finger down past her belly button. “I thought I heard you say something about fucking my titties,” she teased, arching her back and then dropping down to make her chest bounce. “Do you want to fuck my big boobies, Fluttershy?”
Fluttershy was tongue-tied. To say yes - well, that would be the truth, and she couldn’t bring herself to just blurt out her desires. Denying it would be simpler - but she couldn’t do that either. Her body was humming with arousal, her desires too powerful to be shoved back down. When she finally managed to speak, she just whispered, “Well, I can't… not without…”
“Oh,” said White Heart gently. “Not without a cock. You’d need a cock to fuck my titties, wouldn’t you… a long, hard, thick cock…” she brought her hand down to Fluttershy’s crotch and mimed the act of grasping an erect shaft. “A big yellow cock to pump in and out of my cleavage, over and over… feeling those pillow-soft boobs surrounding your thrusting meat until your nuts got tight and shot a big creamy load right out of the fat flared tip… gushing like a firehose, glazing my face and my bosom with your wonderful seed…”
Fluttershy watched, mesmerized, as White Heart pantomimed the act of caressing Fluttershy’s penis. The imaginary shaft was immense, based on the way White Heart was moving her hand - her fingers couldn’t even get halfway around it. She sat up on the bed and brought the other hand in on the action, grasping both sides of the imaginary shaft and sliding them up, up, up… White Heart was stroking an imaginary cock that was two feet long, at least, and Fluttershy could almost feel it. She could almost believe that White Heart’s hands were wrapped around her colossal cock, stroking the velvety smooth skin of her two-foot-long shaft, coaxing a hot, sticky load of cum from her fat, sloshing nuts...
“And when you start coming, you can’t stop, can you?” asked White Heart. “Your nuts just feel so full, no matter how many times your cock shoots! You’re coming all over everything… all over me, all over the bed… your sticky white cum is dripping down the walls, pooling on the floor… you’re going to flood the whole cottage, aren’t you? But you can’t stop… when you fuck my big soft titties, you can’t stop coming…”
White Heart wrapped her lips around the tip of the imaginary cock - about three feet away from its base - and licked affectionately at its tip. Fluttershy groaned, her hips quivering, as she watched White Heart worshipping that invisible shaft; it felt so real, she was certain she would erupt at any second and coat the bedroom with her cum. White Heart wasn’t even touching her, but she’d never felt anything more intense in her life. For years, the idea of having a cock had been nothing more than an idle fantasy, but now it was a red-hot desire. White Heart’s pantomimed affection made gave shape to that desire - made it so powerful that it seemed ready to burst into reality.
“I want it,” groaned Fluttershy, no longer able to hide her passion. “I want a big hard cock… I want to fuck your boobs, White Heart… I want to cum all over you, all over everything… I want to grow bigger and cum harder and never stop…”
White Heart, moaning lustfully around Fluttershy’s imaginary cock, lifted her head to speak. “Do you really want it, baby?” she asked. “I can do it… I can make it real…” her long white horn shone with golden light as she prepared a spell. “If you really want it…”
“Yes!” cried Fluttershy, without a moment of hesitation. “Yes, White Heart… make me grow a big, hard cock! I want it so bad…”
The light surrounding White Heart’s horn shone brighter, and the same light surrounded Fluttershy’s crotch. Fluttershy’s pussy shuddered and clenched and came - and in the same moment, a shaft sprouted from above her marehood. A thick bulge swelled beneath her pink panties - a cock that was half-hard, curled up inside her undies, with a pair of nuts the size of ripe figs. Fluttershy sighed, her body relaxing from her climax - but her newly grown cock was already starting to stiffen, building itself toward another orgasm.
“Ahh… it’s real…” Fluttershy moaned, reaching down to pat the front of her panties. The bulge responded to her touch, and Fluttershy gasped in pleasure and surprise as she felt it - not just in her fingertips, but in her cock. Her cock, a big and beautiful penis of her very own. She’d desired it for so long, and now that she’d finally asked for it, it was hers.
White Heart chuckled. “I hope you weren’t expecting it to be as big as I was, uh…” She once again used her hands to suggest an invisible three-foot-long penis. “The spell responds to your desire, though, so I’m not surprised it’s big!” She lowered her hand and made contact with the bulge in Fluttershy’s panties, gently resting her fingers on the shape of Fluttershy’s thickening cock and fat, round balls. “Ooh, Fluttershy, I love it… what do you think?”
Fluttershy already knew that being touched by her marefriend felt very different from touching herself. Her lips, her breasts, and her pussy had all learned that lesson long ago… but she was learning it all over again through her cock. Her hips jerked as White Heart touched her cock and balls through the front of her panties, and her cock surged into greater stiffness. “It’s… so good,” she squeaked. “White Heart, I want to get hard… grow bigger… cum…” She rolled her hips, stroking her cock against White Heart’s hand. “To be honest…” she whispered, a bit of her shyness returning to the surface, “I… wouldn’t have minded if I’d ended up bigger… I liked what you were doing with your hands…”
“You want to be bigger?” teased White Heart. “Most of the time, it’s hard to get you to say what you want… but now you’re just coming right out and telling me you want to have the biggest dick in Equestria!” she rubbed her palm against Fluttershy’s cock, stimulating it through the sheer fabric until it was fully hard and stretching her panties nearly to the breaking point. Removing her hand, she leaned down until her lips were less than an inch from her marefriend’s penis. Through the surface of her panties, she kissed the head of Fluttershy’s cock, making the shaft quiver. She peppered the flared head with kisses, making Fluttershy squirm; her cock spurted little jets of precum that teased White Heart’s nostrils with the musky scent of her seed.
“You’ve already got a gorgeous sixteen inches down there,” sighed White Heart, “and you’re already thinking about getting bigger? Imagine how hard it’ll be to hide at this size! Just think… you’re out on a breezy sunny day, wearing a short, cute little skirt… you start to think about my big, beautiful tits and you feel yourself getting hard… a breeze blows up your skirt, and everyone sees it! You’ve got the biggest cock they’ve ever seen, bigger than any stallion’s, and just as beautiful as the rest of you…”
White Heart rested her tits on Fluttershy’s crotch, softly massaging her marefriend’s stiff cock. “Every mare would be obsessed with Fluttershy’s long, hard cock… they’d be imagining how it would feel to hold it… to suck on it… to taste your cum and feel it covering their tits…” She pressed her breasts together, squeezing Fluttershy’s cock tightly between them. “Ooh, and they’d want to be penetrated… fucked by Fluttershy’s big fat cock, feeling their pussy stretched wide by your thick yellow meat… feeling you coming inside them, gushing and gushing, filling them up with your potent seed…”
“Mmmph… no,” moaned Fluttershy, “It’s only for you, White Heart… my cock is all for you… you’re the only one I want making me h-hard… making me… cummm…”
Fluttershy arched her back into White Heart’s engulfing cleavage, and her cock erupted in a tremendous gush of hot, sticky cum. Her cum flooded the front of her panties, spilling out the sides with each pump. “Ooh, Fluttershy!” said White Heart, “I can feel you shooting a big, hot load... how’s it feel, baby? Do you love your new cock? Do you love being big?”
“I love… being big…” gasped Fluttershy, still shooting a seemingly endless load into her strained panties. “I wanna be bigger… I wanna grow… be the biggest…”
Fluttershy’s hips shook violently, her cock twitching involuntarily even as her climax began to taper off. Her pounding heart seemed to send shockwaves through her cock, making it thrust against her strained panties again and again. It really felt like her cock was getting bigger - as if her desire for the world’s most massive penis were about to come true. There was a slow sound of tearing as Fluttershy’s pink panties began to give out… and then a louder rrriip as her cock destroyed them entirely.
Her cock was swelling, stretching beyond its previous sixteen inches - but White Heart’s tits were so big that they still enveloped her cock completely. She bounced her tits on Fluttershy’s cock, feeling the shaft thicken inside her cleavage, waiting for it to emerge. “Fluttershy…” she gasped, “you’re growing again! I can feel your big, hard cock growing longer between my boobies… Ooh, you’re so big, Fluttershy, you’re bigger than any stallion and you’re still getting bigger and bigger…”
“Ahhh… how big am I going to get?” groaned Fluttershy. “I want to be huge…”
“I don’t really know!” said White Heart. “The spell I cast responded to your desires, and it must have known that you wanted more. It’s still going, and it might not stop until you’re satisfied.” Fluttershy’s cockhead emerged from the top of her cleavage, and White Heart kissed the edge of her thick yellow flare. “And you keep telling me you want to grow bigger and bigger… who knows when it’s going to stop? If growing feels so good, you might never want to stop!”
White Heart massaged Fluttershy’s swelling shaft with her cleavage, licking the head as it grew taller. “I love watching you grow, Fluttershy,” moaned White Heart. “The bigger you get, the more cock there is to worship. More cock to caress with my titties, more to kiss and lick… ooh, and those big fat nuts are growing right along with it, full of cum and ready to erupt… no matter how big you get, Fluttershy, I’ll love your body and pleasure your massive, beautiful cock. Grow all you want, baby... I want you to be as big as you want…”
“Ooh, White Heart,” moaned Fluttershy. “Your magic is making me so big… No one else has even given me so much… I- I can’t thank you enough…”
“The only thanks I need is watching your beautiful cock get bigger and bigger,” said White Heart. “But if you wanted to give me a big thanks, maybe you could cum nice and hard for me? If you shot a big load of thick white cum, it would make me sooo happy…” Kneeling beside Fluttershy, she bounced her hips to make her tits shake, massaging Fluttershy’s two-foot shaft with her world-class bust. She wrapped her fingers around the head of Fluttershy’s cock and kneaded the firm flesh, then leaned down to lick the precum from her slit. “Cum for me, Fluttershy… I want to see what this cock is capable of. And these big yellow nuts…”
Fluttershy felt White Heart’s palms on her scrotum, teasing the taut yellow skin of her nutsack and the firm, coconut-sized balls inside it. Her marefriend was touching her all over, stimulating every inch of her expanding stallionhood, giving her more pleasure than her body knew what to do with. She gripped the sheets tightly in her hands, her body quaking as her nuts tightened and her cock lurched. She could feel pressure building at the base of her three-foot shaft; she’d felt the same pressure when she’d been a “mere” sixteen inches, but now it felt ten times as powerful, so strong that she felt like she was free-falling.
And when the free-fall ended, Fluttershy’s cock twitched, and the flared head bulged and gushed with the first hot jet of her immense load. Thick seed splashed White Heart’s face, coating her face with nearly a full gallon of spunk. And the next gush followed close after, glazing White Heart with another fresh coat. It dripped down her face and onto her enormous tits, flowing over the surface of her massive mammaries and dripping down into her cleavage.White Heart opened her mouth wide, catching the next spurt on her tongue, and swallowed as much as she could in one heavy gulp. The taste of Fluttershy’s cum, salty-sweet and faintly floral, lingered on her tongue; craving more, she wrapped her lips around Fluttershy’s slit and awaited the next gush. The cum filled her mouth, overflowed it, and she swallowed again, greedily filling her belly with as much of Fluttershy’s seed as she could get.
“W-White Heart…” Fluttershy gasped, “I wanna… cum harder… get bigger… nngh!” Her words shocked even herself; she was already absurdly huge, with a cock that was impossible to hide. Did she really want to grow even bigger? Surely not; surely meek little Fluttershy wanted this ridiculous dick to shrink back to a manageable size. Maybe to disappear entirely. White Heart could always give her a dick next time she wanted once. Yes, that would be sensible-
“Bigger, bigger!” moaned Fluttershy, her explosive desire snuffing out those reasonable thoughts. “I want to be… b-big… want to grow until everyone can see my big yellow cock… I want them to know it’s me… I want them to know I’m the biggest… Fluttershy has the biggest cock, the biggest balls… the most cum… can’t stop coming, wanna cover everything in cum… wanna see you… swim in it… ahhhh…”
The gushing flow of cum from Fluttershy’s cock began to slow. Fluttershy fell back onto the bed, her hips twitching weakly as her dick shuddered and spurted the very last of her load, and White Heart licked up what she could before collapsing beside her mate.
“That was incredible, Fluttershy,” sighed White Heart. She wiped the cum from her face with both hands, then lifted one hand to stroke Fluttershy’s towering shaft. “Look how huge you are.”
“Mm-hmm,” whispered Fluttershy. “Thank you so much for giving me this cock…”
“You should be thanking yourself,” said White Heart. “It would never have grown that big if you didn’t want it so much.”
“Could it still get bigger?” asked Fluttershy.
“Fluttershy!” said White Heart, squeezing the still-erect shaft. “I’m shocked… don’t you know when enough is enough? Hiding a sixteen-inch cock would have been hard enough, but just think about what it would be like to have one this big!” She kept on stroking, teasing the shaft with her hand while she teased Fluttershy with her words. “Maybe, when you’re soft, you could stuff your dick into a pair of tight shorts… but even with a skirt, a bulge that big would be impossible to conceal.”
White Heart sat up and knelt by Fluttershy again, grasping her mate’s cock with both hands and sliding them up and down the veiny thickness. “Maybe you’d be better off just putting it all out there...” she said. “Just let your big, beautiful dick flop out and swing back and forth when you walk… when you get hard it’ll be jutting out three feet in front of you, dripping your delicious precum, putting every stallion to shame…”
White Heart turned around and slid Fluttershy’s cock into her asscrack, grinding her round white bottom against the long yellow shaft. “And if you need me to help you with that big hard dick, I’ll be right there to help you cum… with my mouth, or my pussy, or my ass… however you want me, Fluttershy, you’ll have me…”
“Ohh… that sounds so good,” sighed Fluttershy. Her cock was still hard, and it wasn’t going to go soft anytime soon - not with White Heart’s asscrack gliding up and down the shaft.
“But that’s if you stay this size,” said White Heart. “But you want to grow even bigger, don’t you? You want a cock like a pillar, shooting cum like a fountain, drenching rooftops in your seed… you want balls like boulders, sloshing and churning, making more cum, forever more and more to fill your adoring mare with…” she moaned, reaching past her bosom to grope at her crotch. “I can’t take it anymore… I have to know what it’s like to have you inside me! Just a little magic and I’ll be able to stretch myself over anything… then I can ride your massive meat till you burst inside me…”
Standing on the bed, White Heart straddled Fluttershy’s shaft, holding the flared head between her thighs. A spell flickered up her horn and enchanted her crotch, granting her the elasticity to accept her mate’s unreal endowment. She lowered herself down, kissing the cockhead with her warm pussy lips, and slid lower, inch by inch, swallowing up Fluttershy’s girth. “If you feel like growing wile you’re inside me,” said White Heart, “just go ahead and grow. I’ll be just fine. Better than fine… the more of you I have inside me, the better.”
Fluttershy arched her back, thrusting upwards into White Heart’s pussy. Her cock was a good six inches thick, but White Heart was engulfing it smoothly and easily. Not only was it stretching around her girth, it was also taking her length impossibly well. A full foot of Fluttershy was inside White Heart’s marehood, and she was encountering no resistance as she slid down. The spell that made her pussy stretch was more powerful than she’d realized; its effects were more than a match for Fluttershy’s expanded cock. There was limitless space inside her now, it seemed; with two feet of Fluttershy’s stallionhood inside her, White Heart’s body had become little more than a vessel for cock. She reached down and felt her belly; if she pressed down just a little she could feel the firm shaft through her skin. She slid down further, until her rump landed on Fluttershy’s crotch - and then she remained there, motionless, simply appreciating the feeling of being penetrated by three feet of pony cock. It was absolute bliss to be so marvelously filled… and to feel the pulse of her lover’s heat in every shuddering inch of her cock.
“Fluttershy,” White Heart groaned, “I’ve got all of you… your cock is filling me up, touching me more deeply than any other mare ever could… oh, I want to ride your cock and feel that gushing geyser of cum filling me with your love…”
White Heart straddled Fluttershy’s crotch, with both knees on the mattress, and began to gradually lift her body. It was glorious, feeling Fluttershy’s shaft sliding along the walls of her pussy - even at this lazy pace, that enormous cock was penetrating her more powerfully than any other cock could manage.
Once she’d lifted herself about eight inches up, her body cried out to be filled again. White Heart’s pussy wanted to be penetrated deep, to have every inch of that gorgeous yellow girth inside it, so White Heart let herself slide down the shaft. Moaning, she lifted herself up and dropped again - faster this time - and accelerated towards a frantic tempo.
“White Heart,” groaned Fluttershy, “I’m going to cum again…” she squirmed, digging her hips into the mattress as her hefty nuts gurgled and tightened against her body. “Your pussy is so tight, White Heart, you’re going to make me cum s-so hard… nngh, there’s… going to be so much cum, White Heart, im going to fill your pussy with gallons and gallons of cummm…”
Her body shuddered, her mind blanking as her pleasure overloaded her senses. She stared up at White Heart, watching her marefriend riding her cock, hypnotized by the sight of White Heart’s bouncing breasts. Their size was awe-inspiring as ever, and they were even more beautiful when they were in motion.
And - in addition to admiring her boobs - Fluttershy was experiencing White Heart’s body in an entirely new way. She was well acquainted with her marefriend’s pussy, but now she was fucking it for the first time. Fluttershy had a cock, an enormous and wonderfully sensitive pillar of stallionhood, and every inch of it was being caressed and stroked by the velvet walls of White Heart’s pussy. It was impossibly stretchy, but it was so tight too… she couldn’t hold back one second longer. Should she warn White Heart? There was no way her body could handle the load that was coming her way…
“White Heart - I’m coming,” she gasped. “You… should… nnngh-“
White Heart heard what Fluttershy was saying - and even correctly guessed what she was getting at. Fluttershy’s cock was about to become a geyser of hot, creamy seed, maybe more than White Heart could handle. But White Heart wanted it enough that she was ready to throw caution to the wind. That, and she was on the verge of her own climax. Stopping at this point would take more willpower than she had to spare, so instead she kept riding Fluttershy’s cock - lifting herself up, then letting her luscious white things drop onto Fluttershy’s crotch as she took her marefriend’s cock to the hilt once more. She felt herself pushing past the tipping point, tension building in her core… when a shudder went through Fluttershy’s shaft. White Heart cane, her pussy walls clenching around her mate’s cock… and in the same moment, Fluttershy erupted in a powerful climax of her own.
White Heart felt the rush of cum pounding at the back wall of her cunt, and a sense of fullness as the thick seed flowed into her. She’d expected Fluttershy’s spunk to overflow her pussy and spill out onto the bed… but somehow all that cum was staying inside her. Her body wasn’t wasting a single drop.
And White Heart’s body wasn’t just keeping all that cum, it was using it. Just like the spell she’d used to give Fluttershy her cock, the spell White a Heart used to make herself stretchy responded to desire - and what White Heart desired was to grow larger. To become bustier, curvier, more beautiful in her marefriend’s eyes. Each fresh gush first settled in her belly, then flowed towards the place it was needed most: her rump, her thighs, and most of all her breasts.
Fluttershy was staring up at White Heart, still entranced by her marefriend’s body. It took her a moment to notice that White Heart was inflating each time her cock erupted - but when she saw it, the sudden spike of arousal made her cock pulse and shoot even harder. “White Heart, you’re… growing…”
“S-so arrre you, baby,” said White Heart, shuddering as her endless climax pulsed in her core. “You… still want to be bigger… and you’re growing again… inside me…” she jerked her head back, making her tits bounce wildly. They were twice the size of her head now and still growing each time Fluttershy shot her seed. White Heart hugged her swelling chest, getting her arms around as much flesh as she could, just barely managing to reach her own nipples. “You’re filling me up,” groaned White Heart, “I’m so full of your cummm…”
Fluttershy’s hips bucked upward with each rush of seed - and each time her cock was thicker, longer, pumping greater quantities of cum. Her nuts were keeping pace, bouncing on her thighs, big as prize pumpkins and audibly sloshing with spunk. Fluttershy’s fat yellow balls felt like they were emptying and replenishing themselves every second, pumping gallon after thick gallon into white heard’s marehood, inflating her tits and ass to ever-greater proportions.
There seemed to be no limit to how much cum White Heart’s body could absorb… but she could only handle so much of Fluttershy’s shaft. Three feet of yellow cock were still inside her, stretching her pussy with their growing thickness, but the base of Fluttershy’s meat was now out in the open. White Heart was rising towards the ceiling, her pussy impaled on the lengthening pillar, her body becoming curvier and bouncier each time a gout of seed erupted from her marefriend’s cockhead. White Heart squeezed her pillowy thighs against Fluttershy’s shaft, bouncing her body in a vain attempt to get her mate’s cock deeper.
Before long, White Heart’s head did hit the ceiling - and one last eruption of cum sloshed into her pussy. That seemed to be all that White Heart’s body could take; some of it flowed into her tits and ass, but the remaining gallons dripped from her pussy lips and coated the sides of Fluttershy’s shaft.
Fluttershy’s cock began to soften and gently bend downward. Once White Heart could get her feet onto the bed, she pulled herself off of the huge yellow shaft and flopped down onto the bed.
Or tried to, anyway. Her body, inflated with Fluttershy’s cum, had grown so immensely curvaceous that she couldn’t possibly fit on her half of the bed. Her butt slid right off, shaking the whole cottage when her huge body hit the floor. White Heart’s own tits practically buried her underneath their bulk; each one, at this point, was bigger than her entire body had been at the outset.
“Oh my gosh,” breathed Fluttershy, looking down at her mate. “I made you so big! That’s… that’s all from my cum?”
White Heart picked herself up, a process that required her to roll onto her side and use her curves to sort of bounce herself onto her feet. “This is all from you, you big sexy stud,” she said, thrusting her chest against the side of Fluttershy’s penis. “You bred me so hard! Filled me with so much of your powerful seed… now I’m curvier than ever! How do you like me, Flutters?”
“You’re so beautiful, White Heart,” said Fluttershy. She began to roll her hips, rubbing her half-hard cock against White Heart’s soft chest. “More than ever! It feels so superficial of me to be so focused on your boobs, White Heart, but I just love them… I love how big they are, and the bigger they are, the more I love them… mmm, I want to fuck them, White Heart, I want to get hard again… and… get b-bigger…”
“Oh wow,” said White Heart. “You’re already so big, though, Fluttershy! You cock must be six feet long now… six feet of thick yellow dick… and you want me to help you get even bigger?” She bounced her tits, stroking her mate’s cock with the soft skin of her bosom. “We’ve got to make sure you have room to grow, then… I think it’ll be best if you turn yourself around so your feet are resting on the headboard.”
Fluttershy could see what White Heart was getting at; her penis couldn’t grow any further upward - even if she lay on the floor, it would hit the ceiling very quickly. She’d need to lay on her back and let it grow across the length of the room. Putting her feet against the headboard would give her cock the maximum amount of room to grow.
Once she turned herself around, Fluttershy hugged her cock against her body. Embracing her shaft gave her a new appreciation for its absolute hugeness - it was thicker than her waist, with veins wider than her thumb, and it was already growing thicker as it became erect again. And as big as it was, Fluttershy still wanted it to grow larger. It was colossal, impractical, impossible to ignore… but the desire to become bigger was just as strong as always.
“Please… let me fuck your boobies, White Heart,” gasped Fluttershy. “They’re so big, and so soft… I want to feel my big hard cock between them… if you let me fuck your tits I’ll come so hard… and grow so big…”
“I know you will,” said White Heart. “I want your beautiful cock between my tits… I want to feel it grow…” She lifted herself onto the bed - which wasn’t easy - and lowered herself onto Fluttershy. Thanks to her inflated curves, there was enough of White Heart that her body completely covered Fluttershy, blanketing her beneath her immense milk-white breasts. A pony could very easily be suffocated by breasts of that size - but Fluttershy’s cock stood between herself and White Heart, ensuring that her face didn’t get buried in White Heart’s bosom.
White Heart put her arms around her breasts and pressed them together, sandwiching Fluttershy’s cock more tightly between them. “Fluttershy,” moaned White Heart, “I can’t believe how thick your gorgeous cock is… I’m so glad I gave you this cock, and I’m so happy I can help it grow…”
White Heart began to rock back and forth on the bed, stroking Fluttershy’s shaft with her cleavage. “I want to help you get bigger, Fluttershy,” she moaned. “As big as you want to get… until you have the big, beautiful, perfect cock of your dreams… Fluttershy, you’re going to be huge… ooh, you’re going to stretch my pussy so wide with your huge, powerful cock… and your big fat nuts are going to fill me with so much hot, thick cum…” She bounced her tits harder, making the bed’s frame start to groan. “I know you want to pump me with a big, hot load,” gasped White Heart. “You want to be the biggest, most potent stud in Equestria, don’t you, Fluttershy? Don’t you want to fuck me deep and breed my tight pink pussy with gallons and gallons of your seed…”
“Yes!” cried Fluttershy. “Yes! I need to be your stud… your big-dicked stud… but first I need to get bigger…” She pumped her hips in White Heart’s cleavage, feeling her shaft thicken with each thrust. I have to fuck your tits and grow bigger and bigger… I have to be the biggest…”
“Oh, you’re already the biggest, Flutters,” said White Heart. “There’s never been a cock bigger than yours. You’re a gorgeous mare, with a cock that’s a hundred times the size of any stallion’s… and I just love that you want to get bigger. You just won’t be satisfied until your cock absolutely gargantuan, will you, Fluttershy? You’ll only be happy when you’re a massively endowed goddess with a towering cock and two big, beautiful, sloshing nuts…”
“Y-yes,” stammered Fluttershy. Her cock was growing rapidly now, its length shooting forward six inches at a time as she fucked White Heart’s boobs. “I do want to be a… a goddess… with a long and thick and powerful cock, and two huge nuts f-full of cum… all for you… White Heart, I want to be your big-dicked goddess… to… to fuck your pussy and fill you up with my godly seed… I’ll make your tits grow even bigger, White Heart! I want to make your boobs grow until they’re bigger than our cottage… bigger than mountains… ohh…”
“That sounds so good,” said White Heart. “I loved the way you fucked me when you were three feet long… then six feet long… I loved the way your thick yellow cock pumped me with so much cum… it felt so good when your cum filled up my boody and made my boobs grow and grow… however big you want my titties, baby, I want you to keep on fucking me until they’re big enough. I wanna have big, bouncy boobies for my beautiful goddess to fuck…”
“Yyyyyess!” moaned Fluttershy. “I want to be your goddess, White Heart, and fuck your big… beautiful… boobs… until my huge godly cock shoots a whole ocean of c-cummm…” Face-up on the bed, thrusting her hips, strands of hair clinging to her sweat-soaked forehead, she could feel her climax approaching fast. Her shaft was throbbing, growing larger, shooting jets of precum from the flared tip. Those spurts were far bigger than the full load of any stallion, and her cock shot another one each time she thrust. Precum way splattering against the far wall, coating the top of Fluttershy’s dresser, knocking over knickknacks and dripping onto the floor. Each thrust, each burst of growth, brought the tip of Fluttershy’s cock closer to the wall - and finally, at a length of twelve feet, the tip bumped up against the wall.
Now, when Fluttershy thrust herself into White Heart’s cleavage, her cock slammed into the wall like a battering ram. Not quite as forcefully, perhaps, but the flared, spurting head struck the wall with enough power that it shook the whole cottage. “White Heart…” gasped Fluttershy, “I’m so big, White Heart… you made me huge… I’m going to cum, White Heart, I can feel it, I’m going to cum… so hard…”
White Heart squeezed her tits harder, tightly embracing the base of Fluttershy’s cock, and bounced on Fluttershy with the full weight of her hugely curvy body. The bedframe creaked, groaned and cracked beneath them, but White Heart kept going. “Yes, Fluttershy!” she moaned, “You’re enormous, I have to see what it’s like when you cum with that magnificent, gigantic cock… and those massive balls… show me what it’s like when a goddess comes, Fluttershy! Show me that you’re a sexual goddess, with balls full of thick, potent cum and a cock that shoots like a cannon…”
“I’m… a goddess,” agreed Fluttershy, as her two-foot-wide testicles pulled in close to her body. “I’m your goddess, White Heart, I’m going to shoot… divine cum… from my huge, heavenly cock-“
She cried out, thrusting so hard that her cock dented the wall, and her cock roared as gallons of cum rocketed from her balls up to her tip. Twelve feet of thick yellow cock twitched, shivered, and erupted like a geyser of hot, creamy seed. White Heart watched the immense gush of spunk splatter against the wall; enough jizz to full a bathtub burst forth in the first spurt, and the next one came a half-second later with just as much fluid. Fluttershy groaned deeply, her body quaking from the force of her climax, her mind overwhelmed by the intensity of its pleasure. No pony - no creature - had ever had an orgasm nearly this powerful.
“Fluttershy,” said White Heart, “this is incredible.” She squeezed her tits against Fluttershy’s three-foot-thick cock, feeling each forceful pump as more cum shot through her twelve-foot shaft. She pressed her crotch against the juddering shaft, letting the powerful motion stimulate her dripping marehood. All the while, Fluttershy’s cock was erupting again and again, coating the walls in thick white spunk and filling the bedroom with a rising pool of her seed. The floor was already hidden under the sloshing fluid, and it soon overtook the room’s furnishings - the chest at the foot of the bed was swallowed up by cum, then the end table beside the bed, then the dresser by the bathroom door.
“I love watching you get bigger, Fluttershy,” said White Heart, “and I love this gorgeous, giant cock… do you want to stay like this, Fluttershy? Do you want to be big forever? The spell makes you as big as you desire, Fluttershy… so if you want to be my big-dicked stud… my hugely endowed goddess… you just have to want it.”
“Ahh… ahh… I want it,” moaned Fluttershy, fighting through the waves of pleasure and recovering her voice. “Want to be big… shoot big loads of cum… be a… goddess…”
Fluttershy’s cock had been gradually pumping less and less cum… but now it suddenly surged again, shooting a jet of cum so powerful that it broke down the wall that it struck. A second later, her cock asserted itself, springing upward and slamming into the ceiling. Shocked, White Heart clung to the rising shaft, riding out the violent shaking as it fired off a spurt that blasted through the ceiling. The hole in the ceiling was wide enough that Fluttershy’s dick poked through, exposing itself to the cool moonlight. And Fluttershy’s body seemed to shine, far more than the moonlight would account for. Her body, from her head to her toes to the tip of her twelve-foot cock, was glowing. The light was yellow, like Fluttershy herself… but something about it made White Heart think of it as golden.
Fluttershy’s cock - now stronger somehow, and absolutely determined to stand straight up - was supporting the full weight of White Heart’s body. And even after the immense shaft had risen as tall as it could, White Heart felt herself rising higher and higher. It wasn’t easy for White Heart to look down - her enormous tits were in the way, as was her marefriend’s massive, luminous cock - but she could tell that the floor of the bedroom was receding. Her wings weren’t moving, but Fluttershy was floating, slowly rising from the bed. White Heart turned her head to Fluttershy in the face… but she found herself staring at the long yellow horn that had somehow grown from her forehead.
That was astonishing enough, but there was more to Fluttershy’s transformation than just that. Her body, White Heart realized, was bigger - while White Heart had been focused on her huge cock, Fluttershy had grown from five-foot-eight to something more like ten feet. Her hair was down to her ankles, and it had the same ethereal quality as Celestia or Luna’s mane. But she was taller than any princess, and her mane was more glorious; when White Heart gazed into its folds, she saw blooming flowers - and when she gazed deeper, she saw entire verdant forests and the shadows of scampering wildlife.
“Fluttershy,” White Heart whispered, her mouth agape, “I think you actually became a goddess.”
Fluttershy looked down at herself - taking in the sight of her own glowing skin and the way her dangling feet hovered over the cum-soaked floor. She ran her hand over her new horn and stroked her fingers through her mane. “I think I did,” she said. “You said the spell responded to my desire, and… when you started calling me a goddess, I started thinking of myself that way…”
White Heart laughed. “I sort of talked you into it, didn’t I? I didn’t know the spell could be this powerful, or change this much… do you like it?”
“It’s wonderful!” said Fluttershy. “I never wanted to give up this big, beautiful cock, but I was starting to worry about how I would get around.” She tittered. “It would have been dragging everywhere or bumping into things… I think being a goddess will make things a lot easier! And… I’m sure there’ll be other benefits too.”
White Heart lifted herself up, setting her feet on the base of Fluttershy’s cock so that she could reach her marefriend’s beautiful face. “I can’t wait to see what you can do, my love… my stud… my goddess.”