Chrysalis rolled her luggage over the uneven wooden floor of the cabin and let it rest by the bed. The cabin was rustic, but surprisingly well-appointed - the gas stove was new, the bathroom fixtures were shining and clean, and the walls were covered with calming artwork in warm colors. Chrysalis had thought the cabin had been an expensive rental, but now that she saw it, it seemed like a bargain.

"Swanky," said Chrysalis. "You really spoil me, sweetie."

"Only the best for my queen," said Celestia. She came up behind Chrysalis and wrapped her arms around her, pressing her tits against her wife's back.

Chrysalis leaned her head back, letting her sea-green hair fall over Celestia's shoulders. "Too bad we're gonna wreck it up." She reached out with one leg, hooked the toe of her black leather boot around the leg of a small wicker chair, and kicked it to the floor. A token measure of misconduct was always a fun way to get things started with Celestia, just to remind her that Chrysalis was still the bad girl she'd fallen in love with.

Celestia moved her hands down Chrysalis' curves, feeling where her slim, toned belly gave way to wide hips and a tight, firm butt. "Going to outgrow this cabin already?" she said, her hands lingering on her wife's ass, "Going to break down the walls when this butt gets big and round? Bust through the roof with a big hard cock?"

"Of course," said Chrysalis. She bent at the knee and wriggled down out of Celestia's embrace - and Celestia seized the opportunity to grab her wife's shirt and pull it up and away. Chrysalis turned to face Celestia and backed up towards the bet, idly unhooking her cherry-red brassiere with one hand. She let it fall to the floor, but covered her breasts with one arm in a mock show of modesty. "So you really want us to bust up another building when we get huge?" she asked, smiling deviously. "Shoulda picked a crummier cabin..."

"This place is insured," said Celestia. "Covered for all sorts of damages. Financially speaking we'll be doing the owner a huge favor."

Chrysalis laughed. "You really put some thought into this, huh?" She turned away from Celestia and leaned down to unzip her luggage, wiggling her ass to give Celestia a show. When she came back up, she was holding the slim black crown of the Changeling Queen. With her arm still over her bare tits, she lifted the crown, holding it inches over her head. "Ready to go?" she asked, grinning invitingly.

"I am," said Celestia, "but I wanted to suggest something different this time." She hooked her fingers underneath the rim of the crown and lifted it out of Chrysalis' hand. "Mind if I try this on?"

"Uh... go ahead," said Chrysalis. "Not sure if it'll do anything..."

"Me neither," said Celestia. She set the tiny black crown on her head, and its weight settled onto her shimmering hair. "But it's worth a... a try..." Chrysalis watched Celestia's breasts rise and fall as she took a long, deep breath. As she released the breath, slowly, her hand found its way down to her crotch, where it began to massage Celestia's sex through her sensible tan pants.

"Feels good?" asked Chrysalis. She slipped her hand underneath Celestia's, feeling a powerful warmth emanating from her womanhood. Something was happening, there could be no doubt of that...

"Oohhh," moaned Celestia, "This was... a really good idea..." Chrysalis looked up at Celestia's face and saw her features shifting, slowly morphing into the beautifully equine shape she remembered. More surprising was another transformation - the crown atop her head was growing wider and more pale, becoming less like the carapace of the Changeling Queen and more like solid gold. Its green gems shrank to nothing, and a jewel, the same calm purple as Celestia's irises, appeared in its center. A gold tiara now rested on her head - and while Chrysalis had never seen Equestria's Princess of the Sun, she was certain that this was her crown.

And the crown began to rise, as Celestia's head grew taller. Chrysalis felt the soft flesh of Celestia's growing breasts brush against her nose, and then she watched them rise higher, thew grew, bursting the buttons of her yellow blazer. Soon her tits were looming over Chrysalis' head, still growing, fat nipples stretching the fabric of her shirt.

And lower down, something else was changing. Chrysalis had kept her hand on Celestia's crotch, following its rise upward, and she was starting to feel some growth. Not just the overall growth that her whole body was going through, but the growth of something new. A bulging mass of thick, firm flesh, pulsing with power. Chrysalis remembered the feeling of growing a cock, and she envied Celestia. Feeling that powerful new appendage growing from nothing, becoming a tool that could fuck her wife, fill her up with cum, impregnate her...

Celestia's body had already begun tearing through her clothes, busting open seams and noisily ripping fabric, and soon her new stallionhood became too large to be contained, even by her loose-fitting slacks. An ivory-white shaft as thick as Chrysalis' arm burst out of Celestia's pants, smacking Chrysalis in the face and smearing a line of precum across her cheek. The air was instantly hotter, damper, filled with the scent of Celestia's musk. Celestia's cock, now free to grow hard and rise higher, thickened until it was wider than Chrysalis' thighs, jutting straight up. With the shaft out of the way, Chrysalis beheld her wife's enormous nutsack, a white pouch that bulged with two massive, heavy balls, each one as big as Chrysalis' head.

Chrysalis leaned her head into the intersection of Celestia's legs and rubbed her cheek against the soft fur of her expanding ballsack, nuzzling the fat spheres, hearing the slosh of cum as her ear brushed against them. Celestia's cock and balls were still growing faster than the rest of her, and Chrysalis stroked her wife's nuts as they grew bigger and bigger, dropping below her knees, still churning as they produced inhuman quantities of cum. It seemed that the one who wore the crown got the cock, and that meant it was Chrysalis' turn to get fucked. All this cum, all this hot, thick liquid love that was brewing in Celestia's nuts - it was all for her.

Celestia's balls reached the floor - which would have been jaw-dropping even on her normal frame. On an eleven-foot-tall giantess - which she now was - a floor-dragging nutsack meant truly titantic balls, big enough for a normal person to curl up inside. Standing astride that nutsack were two long, powerful legs, coated in the delicate white fur of Celestia's equine form. And where those legs ended, there was a breathtaking ass, one even finer than Celestia had had the first time she was transformed. Chrysalis had always loved her wife's butt, but the transformation had changed it to something heavenly. As Chrysalis rounded her wife's body, admiring it like a statue, she reached up and brushed her hand across the cutie mark on the side of her ass. The flesh beneath her soft fur was wonderfully soft, and perfectly firm underneath - it jiggled invitingly when she pushed against it, but despite its size it didn't sag at all. It was flawlessly round and magnificently huge, and once Chrysalis was standing behind her, she couldn't resist sinking her hands into the coft cheeks, massaging them lovingly.

"Darling," said the Princess, "Come out where I can see you. I know there's a lot to see down there, but I want to see my little darling wife..."

"No," said Chrysalis, leaning her face against the cleft of Celestia's ass. "I'm having too much fun down here." Celestia's ass was perfectly at head height for Chrysalis, and it was pillowy-soft, covered in soft, fragrant white fur. It was also big enough that it hid Chrysalis from Celestia's sight as the smaller woman nestled herself into it.

But Celestia didn't need to see Chrysalis anymore. The crown hadn't just expanded her body, it had expanded her senses, giving her a magical horn that could feel out the world around her. Wither her magic, she reached out and picked up Chrysalis, lifting her body and surrounding her with a bright yellow aura. "Naughty girl, obsessed with my butt," she chided, and then levitated Chrysalis backwards, pinning her against the wall behind her. "I'll give you a world of ass."

She slammed her ass into the wall where Chyrsalis was pinned, surrounding her face and bare torso with the soft, thick cheeks of her butt. "You like that, bad girl?" said Celestia, wiggling her cheeks. "Bet you'd love to stay there..." She ran her hand along the shaft of her cock, her fingers lingering at the medial ring and the flared tip. "But I need something to fuck, babe..."

Her horn glowed brighter, and the crown on her head glowed along with it. A golden ray of magic whipped around her body and shot into Chrysalis, who was still wedged between Celestia's cheeks. Celestia felt her wife growing, pushing apart her asscheeks, so she wiggled her butt, letting the soft flesh roll and jiggle over the growing shape of Chrysalis' body. She could feel Chrysalis' torso growing wider, and she could feel Chrysalis' tits growing even faster than the rest of her. The two mounds on Chrysalis' chest fought back against Celestia's massive cheeks, asserting themselves with just as much firmness and size.

Soon Chrysalis grew large enough that her head was no longer trapped between her wife's asscheeks and her legs could reach the floor. Celestia looked back and saw the face she recognized as Queen Chrysalis, with the equine snout, the crooked black horn, and the fearsome fangs. "Queen Chrysalis," she said, "It seems that I've captured you."

"Hmph," snorted Chrysalis. "You think you have power over me, Princess?" She struggled a bit, wiggling her beanbag tits against Celestia's asscheeks. Now that Chrysalis was just as big as Celestia, she was certain she could break free - but she wanted to see where Celestia's little roleplay was headed.

"I have the crown, changeling," said Celestia. "I have the cock. I can repay what you did to me all those years ago." She thrust her ass backward, pushing Chrysalis back into the wall of the cabin, making the wood crack. "I can breed you. Make you beg for my seed and then give you the privilege of bearing my foal. Bloat your body with so much cum, until you're nothing but a vessel for my will - and for my heir."

"Pah!" spat Chrysalis. "I will not bow before you. You are a weak ruler, Princess!"

Celestia stepped forward, releasing Chrysalis from her asscheek trap. She turned to Chrysalis, who now stood as tall as her, scraping the ceiling with the tip of her horn. She was almost made speechless by the beauty of her wife's transformed body - the slim but powerful limbs, coated in a firm, shining black. The gossamer wings, idly flicking. And her breasts, perfectly firm, larger in size even than Celestia's own, big enough to hang down to her navel. "Am I weak?" said Celestia, staring sternly at Chrysalis. "If I am weak, then resist me. Look at this body, this heavenly ass and mighty cock, and tell me truthfully that you do not wish to be taken by me. Look me in the eye and say that you do not wish to be taken by me. Penetrated by me. Stretched around my cock and bloated with cum." She put her hand on the tip of her cock, running one finger around the wide flare. She was amazed at the size of her own cock - it was thick like a tree trunk, and every touch made the flesh shudder with delight. "What say you, changeling queen?"

Chrysalis was practically drooling. She loved the fearless side of her beautiful wife. The strength that had made her impossible to ignore, even for a young, brash Chrysalis. When her mouth opened and spoke the words "Please fuck me, Princess," it wasn't simply roleplaying. Both her words and her reverent tone came straight from the heart.

"Of course, my love slave," said Celestia. She twirled her finger. "Turn around, changeling. Since you played with my butt without my permission, I'm going to visit the consequences upon your ass." Obediently, Chrysalis turned around, pointing her big black ass in Celestia's face. Celestia put her hands underneath, stroking the smooth, shiny skin, tasting the curves with her fingertips. Her butt wasn't as big as Celestia's, but Celestia was sure it would have no trouble stretching around her cock.

"Please," said Chrysalis, as the flared head of her wife's shaft began to part her asscheeks, "Show me no mercy, Princess. Show me your strength. Rule over me." She gasped, lost for words, as the tip effortlessly penetrated her ass and went deep, facing no resistance. Their bodies were made for each other - had been magically reformed to be perfect for each other - and so Chrysalis' ass was perfectly tight, perfectly yielding, and the feeling of Celestia's tree-trunk cock inside her was so wonderful, so natural...

And yet, what was happening went far beyond what most people would consider "natural." Celestia's cock looked like it would be a tight fit in a woman three times her size, and so Chrysalis' body had to stretch around it. As it penetrated her deeper, Chrysalis could feel her tummy distending, the skin painlessly stretching over the shape of her wife's shaft. She reached down with one hand and felt the outline of Celestia's flare through her skin, letting her fingers follow it as it slid further up her torso. Once it was all the way in, she could feel it coming almost to her throat, the thick rod deep within her cleavage, touching depths of her body that she never imagined she had. She'd envied Celestia because Celestia had the cock, but now that she was being penetrated - fucked by her wife's long, thick cock - she couldn't imagine anything better.

Celestia began to thrust, sliding herself in and out of Chrysalis' ass, stretching her body anew with each juddering thrust. Chrysalis was struck by the memory of being in her wife's position, fucking Celestia so deep that her body stretched around Chrysalis' cock, and how Celestia had used her breasts to embrace Chrysalis' shaft. Not be outdone, Chrysalis squeezed her breasts together, doing her best to corral the enormous jiggling globes with her arms. She couldn't get her arms all the way around them - she could barely reach her own nipples - but she manged to compress the soft flesh around the pistoning shaft inside her, hugging it with her breasts each time it hammered into her chest. Celestia moaned, feeling the pillowy tits embracing her cock, and her cock throbbed with the quickening beat of her heart.

And with each throb of her cock, Celestia felt a surge of growth. Her horn pierced the roof of the cabin, splintering the rafters, and her head followed, busting a widening hole in the ceiling. Her ass expanded through the cabin, shoving aside a chair, then a dresser, then engulfing the bed beneath its growing white mass. And as before, her cock and balls grew quicker than the rest of her, stretching Chrysalis' body around the widening shaft. Her wife's body, made supernaturally stretchy by the magic of the crown, stretched along with the growth of her cock, becoming a living jet-black condom on her enormous white shaft. Once her cock reached ten feet in length, the weight of Chrysalis' body was no longer enough to weigh it down, and it rose up, nestling itself in Celestia's cleavage. As Celestia's shoulders broke through the roof, she watched the tip of her cock - and Chrysalis' throat, stretched around it - rise past the level of her eyes. Celestia wrapped her hands around her shaft, ad was pleased to find that, while Chrysalis' body had lost most of its shape, her enormous breasts were still there, hanging round and firm off her stretched-out torso.

Celestia grabbed Chrysalis' tits, running her thumbs over the bright green nipples, and used them as handles to lift Chrysalis up and down, using her distended body as a cocksleeve to jerk herself off. Celestia was still growing, and as her climax came closer, she felt her ass busting through the roof, destroying it entirely and leaving nothing of the cabin but the four walls. Her balls, now tightening as they prepared to release their load, were so big that they occupied the entire floor space of the cabin. She sat on them, using her own churning nuts as a beanbag, letting her enormous ass settle onto her fat ballsack.

Celestia grunted, feeling gallons of cum rushing through her shaft - and the feeling was just as intense for Chrysalis, who felt the cum stretching out her body as her wife's shaft bulged inside her. When Celestia's royal load burst from the tip of her cock, Chrysalis felt the hot, thick warmth splash back into her body, bloating it with sloshing liquid. The flow of cum was relentless, almost ceaseless, pouring like a firehose of intense, powerful love. The one thought in Chrysalis' head, as cum ballooned her body, was love, love, love. She knew that her counterpart, the Changeling Queen, subsisted off of love, and as she was filled with her wife's cum, she understood what that was like. Celestia was feeding her, nourishing her, giving her the love she needed to live - and to grow.

Chrysalis felt her body beginning to reassert its shape. She was digesting her wife's cum, turning it into power and size and living, feeling flesh. Her body grew in all directions, her hips and shoulders widening, her arms and legs lengthening, her breasts growing rounder and heavier.

Down below, Celestia's ballsack outgrew the cabin, knocking down its four walls all at once. Chrysalis was nearly back to her normal shape and almost as big as Celestia had become, and the weight of her body bore Celestia's cock down towards the ground. The Princess' orgasm was only just ending, shooting the last few dozen gallons of cum into her wife's ass, and Celestia slumped down, temporarily drained of strength. Chrysalis stayed on her cock just long enough to absorb the last of her liquid love, then pulled herself off her wife's cock, standing up at her full height of some thirty feet.

Chrysalis had never felt more powerful. Celestia's love had always been nourishing, always a source of strength, but never so literally as now. With this much love inside her, there was nothing she couldn't do. And she knew exactly what she wanted to do next. "Fool," she said, looking down at Celestia, still sitting atop her own ballsack. "You thought to punish me by feeding me love? You have made the changeling queen more powerful than ever!" She lifter her foot and placed her heel on Celestia's cleavage. "But I can always grow stronger, pony princess. And you will feed me again. More and more of your love, until none can challenge the power of the Queen."

She pushed with her heel, with just enough force to make Celestia topple backwards off her enormous ballsack, landing on her back amid the island's sparse grass. Her cock stood straight up in the air, and Chrysalis stepped forward to straddle it, hovering her thick round ass over the enormous shaft. She brought her dripping green pussy lips down onto the flared head and lowered herself down, sighing lustfully as she impaled herself deeper and deeper on her wife's shaft. Celestia was whimpering as Chrysalis' tight, slick pussy surrounded more of her shaft, dripping its juices down her length, sending warm liquid pouring over her belly and her bulging ballsack.

Once again, Celestia's cock went impossibly deep inside Chrysalis, as if her whole body was just a vessel for cock. Once the entire shaft was inside her, Chrysalis lifted her body up and slammed it down onto Celestia. The speed of her thrust and the force of her impact made her gigantic jet-black tits shake - despite their firmness, they bounced with enough force that they smacked Celestia in the face, slapping her with soft, fragrant skin.

With Celestia moaning and writhing helplessly underneath her, Chrysalis brought her ass down over and over again, harder and faster, her boobs slapping against Celestia's face with each downward motion, her pussy pouring its nectar over Celestia's shaft. The island shook with the power of their lovemaking, sending ripples through the bay as it grew more frenzied, more passionate -

And then Celestia came, her rumbling balls shooting a flood of cum into Chrysalis' cunt. Instantly, the changeling queen felt the love feeding her, and she joined her wife in climax, her pussy clenching around the shaft, milking it, drawing the jizz into her body faster. Her belly swelled with cum, bulging and flowing over Celestia's prone body, overtaking Celestia's tits as it grew bigger and bigger. Soon Chrysalis' body began to lose its shape again, swelling out in all directions, her spasming limbs becoming immobile, bloated nubs on her ballooning body. Gallon after gallon filled her, bloating her just as big as she'd inflated Celestia, so long ago.

In the end, her body was a wobbling black balloon, ten stories tall, stuffed with cum and still speared on Celestia's cock. "I love you," she said, and from far below, she heard Celestia say "I love you," in return.

"So how long did we rent this cabin for?" said Chrysalis. "A week? It didn't take us long to break it."

"Well, I'm still horny," said Celestia. She rolled her hips, and Chrysalis felt her wife's towering cock, still hard, move inside her. "I guess we'll just have to spend the rest of the week like this. Let me know when you're ready to go again."

Chrysalis grinned. "Who said I'm not ready?"

Author's Note

This story was a commission! If you want one of your own, see my commission policy and prices here. I can also be reached at massdriver77 {at} gmail {dot} com, or on Discord at MassDriver#3858.

I've also set up a Ko-fi! If you want to support my work but you're not looking for a commission, it's a great way to leave a tip!