Author's Note

After looking at a myriad of art, I got inspired to do this little piece. Hope you enjoy.

Day One - Breaking them in

A slow moan of pain gasped from the lips of a long, slender creature, stirring pitifully in the cloying darkness. Cracking open one of her eyes, the pink orb peered into the blackness. From first looks, the walls appeared to be those of a cave, rounded and worn, distinct completely from that of a normal building. Adjusting to the gloom, she spied multiple lamps on the walls, oval in shape, casting a very dim green down the sickly green/grey walls. Following the contoured architecture down, her eyes met the surface of what appeared to be a great body of liquid. A distinct lack of wind caused the surface to remain static, even as long globs of the stuff leaked from the ceiling, depositing themselves with quiet plops. Thin fingers were curled against herself, aware of the cool, but humid air.

Tilting her head, she caught sight of her body, her fully exposed, naked body. A small, involuntary shiver ran down her back as her hands flew to cover her breasts. Panic starting to fill her body, she glanced to her side, barely picking up the sounds of quiet breathing. Laying there on the bank was a blue alicorn, just as naked as she was. Her flowing, ethereal hair was piled up around her head, acting like a pillow on the hard flooring. “Luna! Luna get up!” the mare hissed, reaching over with a white hand, giving her a nudge on the shoulder.

“Celly…just 5 more minutes…” Luna responded, rolling over, resulting in her banging her arm sharply on the floor, jolting her awake. In an instant her deep sapphire eyes shot open, peering around the room. “What in the name of Equestria?” she called out, eyes flicking back over to the white mare, her face creasing in worry. “What is going on sister?”

Celestia pushed herself upright, finding the strength to rise to her feet. “I have no idea, the last thing I remember doing was tucking myself in last night, finishing a small slice of cake. Now I haven’t got the foggiest idea where we are…” Reaching a hand towards the night princess, Luna graciously took it, rising to her full height. Now they were fully lucid, Celestia craned her head around, looking for an exit. What she noticed was a subtle sweet smell in the air. It smelt fresh and had a somewhat organic smell to it the mare couldn’t quite place. Scanning the walls, she was disappointed to see that they looked sealed, like the room had been built around them. Squinting in the darkness, she decided to light her horn.

Instantly, she felt an odd tingle in her horn, with no light appearing. Frowning, she tried again, only to be met with the same feeling. Reaching up, she placed her hands onto the long keratin spike, only for them to collide with something first. “My word, Celly, what in the world is that?” Luna’s voice called out; her eyes transfixed upon the strange device. Surrounding her horn, were 4 long black rods, with metallic bands ringing around them every so often. A number of dull green gems were embedded into slots on the rods, which pulsed slightly with light as Celestia attempted to light her horn once more. Looking back over to Luna’s own head, she noticed a similar looking artefact placed onto her head.

Grasping it with a hand, Celestia attempted to pull it off, only for it to remain in place, even after some painful sharp tugs. Just as Luna was starting to fiddle with her own, a long bubbling, tearing sound came from the wall behind them. In an instant, the sister whirled around, hands at their sides. Brighter, but still green light poured through the hole, which was obscured as multiple silhouettes blocked the passage. A low snickering, followed by a cackling rang out as a tall figure slowly made her way in.

She was dressed in what appeared to be a bodysuit and legging, made of overlapping layers of green petal like structures, it’s dull shine giving the appearance of leather. This was tightly wrapped around her onyx skin, with the tops of her shapely thighs to remain exposed. Her large bust was tightly wrapped up too, with the large orbs almost threatening to pop out at a moment’s notice. A nasty smirk was plastered onto her lips as she strutted forwards, flanked by several guards.

“My my… Look at you two, you do look pathetic, well, more so than usual.” At those words, the alicorns fell into a battle stance, raising their arms ready to fight her.

“Chrysalis! I should have known it was you!” Celestia growled out, watching as the guards filed in behind, covered in thick chitinous armour, before the wall closed again with a slick snap. They had their hands wrapped tightly around a mixture of weapons. One brutish looking individual brandished a warhammer, lightly drumming his fingers on the shaft. “Whatever you have planned, I won’t let you get away with it!” Her horn attempted to glow with energy once more, only for it to be syphoned off once more. The Queen’s mouth split in a terrible laugh, which was joined by her guards, as her own horn hummed to life. Sickly green energies dancing around the crooked spike, arcs of magically charged electric dissipating with a small whiff of ozone.

Instantly, the sisters suddenly felt a sharp pain in their heads, forcing them to their knees as they cried out. “Oh, such bravado will get you nowhere Celestia. You see, I admire how powerful your magic is. If I were to let you go, you or your sister could vaporise me where I stand. So, I did the one thing that would stop you… cut off your magic and turn it against you.” Reaching out with a long finger, she traced it down the metallic rod, watching as a small arc of magic leapt to her finger.

“You see, standard inhibitor rings would have just burnt out from the raw energies alicorns produce, so I had my best artificers make these ultimate nullifiers. Able to store the intense magic inside specially crafted and refined storage gems, then release them when needed, say… when a certain bad princess is being a little too hot headed.” Glancing over to her minions, they instantly surged forwards, grabbing the two mares, dragging them over to the lakeside with some difficulty as they tried to shake off their vice like grips. Now with their faces just over the water’s edge, Luna could clearly smell the sweet odor of the liquid.

“W…What is this?” Luna muttered, wincing slightly at the tight grip the guard had on her arm.

“That, is none of your concern, only that it is… a little experiment so to speak.” The two raised an eyebrow, Celestia’s face knotting in concern. “You will drink the liquid, and I will watch you do so.” Luna was about to resist, when the intense pain that the inhibitor brought flashed back through her mind. Gulping, she knew she had no choice in the matter. Slowly, the night princess leaned down, before submerging her mouth into the liquid. She nearly gagged when she took her first mouthful, not expecting it to be so viscous. It reminded her of jam or thin syrup, where she could barely gulp it down.

Bland was the best word to describe the taste. Bland with the same slight sweet flavour behind it. It wasn’t unpleasant, just uninteresting. As it slid down into her belly, she pulled her face out of it, with long ribbons of ooze still attached to the surface. Luna then felt the Queen’s hand forcefully push her back down again. “Did I say you were finished? You will be done when full to bursting with my special formula, so get sucking Princess!” Knuckling down, the pair drank in silence, the only sound being the gulping and occasional complaint of their stomachs as the foreign goop was forced in.

Surprisingly, as they drank down more, the better it started to taste. Going from the tasteless muck, soon an almost candy flavour blossomed, like that of an apple. Luna took another, even larger gulp, swelling her cheeks out like a chipmunk. “That’s it… keep going, gulp swallow, gulp swallow. There’s nothing too it…” Kneeling down, she reached out her hands, giving their distended bellies a rub, both sputtering from the pressure on their sensitive stretched skin.

Already, the heavy goo had stretched out their stomachs a fair bit. Their trim, flat middles pushing out into slight pot bellies from the sheer quantity of goop shoved into their guts. As they continued taking in mouthfuls, another effect was becoming apparent, though the two were too engrossed to notice. Before, they had to force down each throat rippling glob, but now they were picking up the pace with a little vigour. “Oh, I should mention, that special formula has a slightly addictive property… Not that you can stop now of course, you’ve already packed your alicorn bellies to the max with the stuff, flooding your brain with pleasure signals.” Giving the aforementioned guts a pat, she watched in fascination as they still wobbled and sloshed, despite how packed they were.

A moment later, the pair were dragged back from the edge, pushing them onto their backs with a dull thud and a slight strained blorp. The pair winced as they blinked, the slight glassy sheen dissipating as they came too, before another angry gurgle rose from their guts. Leaning against a nearby pillar, Chrysalis was tempted to let them suffer, but she had a job to do. Lighting her horn, she targeted the devices surrounding their horns. With a crackle, the gems pulsed angrily, coronas of excess energy spiralling off as the second function of the insidious contraptions worked. Both the sisters felt a tug of magic in their skulls, unnatural and unwilling, like a leech drawing blood.

With a cruel smile, she watched as their horns flared to life, the normal white and blue magic tainted by swirls of the sickly changeling magic. It swam through the aura, like pollution spreading through a crystal-clear lake. Even in their altered state of mind, the alicorns could feel how wrong this was, how their own magic signature was being violated by an outside force. Suddenly, the workings of a spell were formed, as Celestia watched her corrupted essence encircle her gut before she felt the pressure inside dissipate and shrink. Eyes widening, she watched as her breasts began to expand outwards, like a balloon at a fair. But unlike a balloon, she could feel the new heft being added to them, like they were filling with a liquid.

“Oh perfect, the formula is working just as planned!” The Queen crowed in excitement as Luna jumped from a D cup to an E cup in a few short moments. However, something else had caught the insectoid’s attention “It seems that it isn’t completely perfect though.” Luna let out a gasp as the sable hand encircled a new formed belly, currently puffed out onto her lap. Indeed, breasts were not the only thing that had grown. The once trim sisters now were bloated and podgy, as budding love handles encircled the tops of their rounded thighs. Upper arms swelled out, the beginning of bingo wings starting to touch their elbows. Their lean, shapely faces had rounded out, the ghost of a pair of jowls on the horizon for the pair.

“You… you monster… How dare you do this to us. Violating our bodies and disfiguring them!” Luna burst out, anger tingeing her widened cheeks red. Fists clenched, she took deep breaths as she glared over the changeling, who gave her a mock blown kiss, then pointed to the night princesses horn.

“I dare? Of course, I dare. You two are prisoners of the Changeling hive. You have no idea how long it took for me to set this in motion. The amount of deception I have been sowing. There will be no evidence I ever captured you two.” Sauntering over to Luna, she booped her swiftly on the nose, though it was more of a smack than a friendly gesture. “I. Own. You. Both. I own your bodies, your magic.” She turned around, heading to where the door should be. A moment later, it peeled back, allowing the procession of ‘lings to exit. With a small clatter of armour and weapons, they swiftly made their exit. Just as Chrysalis was about to leave, she pivoted on her heels. “And soon, I’ll own your mind too…sweet dreams.” With that the door slammed shut, leaving the room in near darkness.

For a moment, the two didn’t know what to say, just looking across at each other with saddened expressions. Celestia watched as a thin line of white liquid leaked from Luna’s right nipple, dibbling down onto her flabby tummy. Already, she could feel an unnatural wave of fatigue pass over her, as the accursed device began to work another involuntary spell. “That Harlot… I already feel like a fattened sow.” Luna whispered, nearly inaudible. “If only we fought harder…”

“I certainly hope she was bluffing about the planning. Fret not dear sister, I’m sure that Twilight and her friends are already looking for us. Hay… I’m sure everypony in Equestria is looking for us. Give it a few days, and we’ll be out, right as rain and ready to hit the gym.” Celestia smiled, half believing her own lie. The air of confidence surrounding the Changeling was near asphyxiating. She knew, deep down, that she was going to be here for a long while.

Another burst of fatigue caused her eyes to droop, flutily staving off sleep, until she collapsed, followed moments later by Luna. As they descended into dreamless slumbers, the only sounds were that of their light, airy snores filling the room. Only for it to be interrupted from a quiet, wet slap of a new load of goo ringing out as it was deposited into the pool.