Limestone Pie was not known for being stressed, sure she had a lot of responsibility, and wasn't quite the rock that Maud Pie was but she could still be counted on quite a bit. She rarely took sick days, personal days or even a weekend off. She loved rocks, and working, and to most, that seemed like all she enjoyed. Not many knew otherwise, which was exactly how Limestone liked it, as the less they knew of her, the better in her mind. She was the bedrock of the pie family rock farm, unshaking, and on an average day, was always ready to work.

Today was not an average day however, and right now she was trotting as stealthily as possible towards Sugar Cube Corner in hopes of seeing the one pony that would help her deal with something she dare not speak of in pleasant company. She was the immovable object of the pie family rock farm, the anchor for her parent’s business and the one pony her family counted on more than any other. Yet this latest heat, combined with the addition of far more work then normal, had left her stressed beyond reason. After only two days of it, she was already desperate for release. Something she knew she would find here, in Ponyville.

The mare gulped and raised a hoof, but found herself unable to actually push the door to the confectionary open. Her legendary confidence, and calm, almost cocky demeanour had been thrown for a loop due to the sheer intensity of the heat and stress weighing her down. Her normally half tended to mane was even worse than normal and hair stuck out at random angles. Her fur hadn’t fared much better, something made worse by the long walk to Ponyville.

Maybe I should just go home. She thought to herself, only to slam her forehoof into the ground and shake her head. No, I came all this way, I brought the bits, I can't just turn around now.

“Hey sweaty lady, are you going to go in or what?” A small voice asked from behind her, alerting Limestone to the fact that she wasn't the only one going to Sugar Cube Corner in the middle of a wednesday afternoon.

“Err yeah.” She muttered weakly, taking a step back and allowing a brown coated earth pony colt to shrug and walk past her, making his way into the establishment.

With a sigh, the mare followed the colt, an unusual amount of doubt cluttering her mind. With head held low she trotted into her sister’s place of work and instantly began looking for the familiar pink of the titular party pony.

The register was manned by a stallion Limestone knew was Mr Cake, and there was no Pinkie Pie anywhere to be seen. Limestone had taken a single step towards the register, intent on asking where her sister was, only for a familiar voice to suddenly pipe up. “Oh look it's Limey!” It announced, a second before the voice’s owner popped up in front of Limestone’s face.

Having grown up with the party pony Limestone usually wasn't surprised by her sister’s antics but with her nerves being what they were, Limestone didn't react like normal, and leaped back and raised her hooves only to notice who it was. “By the stars Pinkie, don't do that.” Limestone cursed, a hoof against her chest as she glared weakly at her sister.

Pinkie Pie raised an eyebrow. “You alright Limey? Your usually even harder to surprise then Maud.”

“I’m fine Pinkie.” Limestone hissed.

“Well you don't look fine.” Rainbow Dash interrupted, leaning out of the booth Pinkie had popped out of. “In fact you look like shit.”

Rarity smacked her speedster friend before Limestone had the chance, giving her a weak slap on the shoulder. “Rainbow, thats rude.”

The pegasus shrugged. “But it's true.”

“I’m fine.” Limestone hissed, while leveling the worst glare she could muster at Rainbow Dash.

Pinkie Pie threw her hoof around her sister’s shoulder and grinned. “Aww I’m sure it's nothing a good jawbreaker won't fix.” She paused, rubbing her chin with her other forehoof and accidentally leaning nearly her entire weight on Limestone’s shoulders. “Or was it you who liked angel food cake and I’m thinking of Marble, I always get you two mixed up for some reason.”

“I don't like either, and that's not why I’m here anyway. I sent you a letter, remember?” Limestone added, leaning in closer and whispering the last sentence in her sister’s ear.

Before Pinkie had a chance to respond Twilight peaked out of the booth as well. “Hey Limestone, would you like to join us? We got room for one more and Pinkie Pie made this huge cake that we are not going to be able to finish.”

“No, you gravelhead!” Limestone growled. “I’m trying-”

“Well shoot, now that's just rude.” Applejack interjected.

“Yeah Limey, you should apologize.” Pinkie Pie added.

“I was not-.” The mare’s jaw slammed shut and she stood there grinding her teeth together for several seconds before she finally managed to get her anger under control.

Looping a hoof over her sister’s head she roughly pulled Pinkie Pie aside. “You got my letter, right?” Limestone whispered.

Pinkie nodded. “Yupperdoodle.” Pinkie Pie announced excitedly.

“Shhh.” Limestone interjected, pressing a hoof against her sister’s lips. “So, were you able to work it out like last time?”

Pinkie shrugged. “The old pony isn't in the business anymore but don't worry I found somepony else to fill that void.” The party pony pressed a hoof against Limestone’s chest and giggled at her own joke.

Limestone knocked her sister’s hoof away and shushed her again. “That's fine Pinkie but-”

“Hey are you two alright over there?” Applejack hollered, interrupting the tense, whispered conversation.

Limestone ground her teeth together once more, and slowly turned her head, her neck making a horrible sound not unlike two rocks being ground together. When their eyes met, Limestone glared hard at the other earth pony. “We, are, fine.” She exclaimed through clenched teeth.

“Alright, keep your pants on I’m just asking.” Applejack shrugged and turned back to her slice of cake, and ignoring the glare Limestone continued to level her way.

Turning back to Pinkie Pie, Limestone tightened her grip on the mare’s neck, bringing her closer. “So, are we doing this then?” She asked.

“Yup! Just meet in the cellar after ten o'clock!” Pinkie Pie announced excitedly, in as low a tone as she could manage.

“Do they have a uh, well, you know.” Limestone muttered, gesturing wildly to her waist.

Pinkie Pie blinked owlishly, only for her eyes to go wide when realization struck. “Ooooh yeah totally, don't worry Limey, she's got a nice big fat one for ya.”

“G-good.” Limestone muttered, her face becoming a bright red as a blush overtook her features. “And does she er, know about my… likes?”

“Oh Limestone, I got this remember? Have I ever steered you wrong before? She knows it all, she's got it all.” Pinkie Pie exclaimed dismissively.

“So uh, do I give the bits to you or her or what?” Limestone whispered.

Pinkie Pie shook her head. “Nah, she's doing this pro bono.” The party pony giggled and leaned in closer. “Or should I say pro boner?”

Limestone did her best to ignore her sister’s incessant giggling, something she was only partially successful at. “Well what the hell am I supposed to do with all these bits then? Marble is going to ask questions if I come back with all the money I apparently needed for ‘supplies’.”

The party pony shrugged. “I dunno, give em away to a charity or actually buy the supplies you said you were gonna get?”

Limestone sighed. “Well I did bring enough for supplies and the special services, so I guess I can go shopping or something.”

“That's the spirit.” Pinkie Pie announced excitedly, clapping her sister on her back. “Now come on, there are only a few slices of cake yet and I haven't even had my peice yet!”

Limestone sighed and took a step back, releasing her hold on Pinkie Pie, who did the same, bouncing her way back into her seat in the booth. Following at a more sedate pace, Limestone made her way over to where Pinkie and her five friends were sitting, only to notice that no one was ready to give her a space to sit in.

All save for Fluttershy, who scooted over to create a spot between herself and Rainbow Dash. “You can sit beside me, if you’d like.” She announced, sporting an uncharacteristically wide grin.

“Thank you, Fluttershy was it?” Limestone asked, passing by an grumbling Rainbow Dash who reluctantly slipped out of the booth to make room for the stressed out earth pony.

“I knew you remembered!” Fluttershy announced.

Nodding to herself, Limestone took her spot beside Fluttershy, making note of just how warm her reception was from at least one of Pinkie’s friends. Shrugging off the weirdness, Limestone silently cut herself a peice of the large rainbow colored cake and listened to the conversation buzzing around her, sitting in silence with Fluttershy, who didn't seem to want to join.

Limestone crept silently through the streets, stopping behind a cart and breathing heavily as she looked around the area. Though the act of running across town hardly taxed the well built mare, her heat had grown unbearable over the last several hours and she ground her teeth together as she waited for one last stallion to leave the market. With him gone, Limestone put her head down and sprinted towards Sugar Cube Corner north side, where the cellar door, and also her target, lay.

With noone to see her, Limestone threw open the doors and dove in, shutting the large wooden shutters behind her. Now inside, and away from prying eyes, Limestone wiped the sweat from her brow. “That was close.” She muttered, not even wanting to imagine what it would do to her reputation if anyone found out what she was truly here for.

Shaking her head, the mare breathed deeply, trying to stave off the shaking that threatened to spread up her legs. The nervousness she felt was unusual for a few reasons, one of which was the simple fact that she was nervous at all. A fact that she tried, and failed to not bother her.

Pushing aside those nagging thoughts, Limestone stomped her hoof and straightened her back, regaining some of the pride her desperate run across town had made her lose. “Remember what Pinkie said.” Limestone mumbled to herself. “You aren't allowed to see her, and are not allowed to ask for details about who they are. Just like like last time.”

A shiver of excitement ran up the mare’s spine, a bolt of excitement that grew more potent when her eyes adapted to the darkness and she was able to see her surroundings more clearly. Small, soft candles burned around the room, barely illuminating the dark basement in a gentle glow. What she could see made her heart beat a little faster, and the heat between her legs to grow more intense than ever.

Riding crops, blindfolds, strap ons, butt plugs, and toys of all shapes and sizes were laid out on the tables or hung from the wall. More interesting then even all that was the riding horse in the center of the room, for it was perfectly Limestone’s size, and was complete with all manner of straps to ensure she could not escape of whomever was her newest mistress.

Pushing aside her building excitement, Limestone forced her mind to go over the last of the rules one final time, ensuring she forgot nothing. “She's allowed to do whatever she wants with me, and I have to obey.” The mare grinned, letting out an uncharacteristic squeal of excitement. “Oh I hope she's big, and doesn't leave me like the last one.”

“Oh I wouldn't worry about that.” Came a distorted, almost garbled voice that sounded both masculine and feminine at the same time.

“Who-” Limestone caught herself, and looked down at the floor. “Mistress, is that you?”

“It is.” The voice announced, the sound echoing as if coming from all directions and none at the same time. “Put on a blindfold, as well as a collar and then lay down on the horse.”

The earth pony shivered in excitement and nodded eagerly. “Yes mistress.” She announced, before proceeding to do exactly as was commanded of her.

First she trotted over to the nearest table and found a small selection of collars ranging from a simple black leather one bereft of decoration, to a much larger, and much thicker one with spikes sticking out of it. Grinning to herself, Limestone grabbed the larger one and secured it around her neck, tightening it just enough for it to be a constant reminder of her place, while also not choking her too much.

“Excellent choice, it suits you well, my pet.” The voice commended.

Limestone grinned from ear to ear, her usual subdued and prideful personality all but sublimated while in the presence of one that she had given herself to. “Thank you, mistress.”

“Well? You better get moving, I can smell your arousal from here.” The voice announced sternly.

Limestone nodded, saying nothing as she moved over to the blindfolds and grabbed one that seemed large enough for her, while also not being as frilly and girly as the rest. Before she donned it however, she walked over to the horse, ensuring that after she secured it, she would be able to get on with ease. With that done, she put the blindfold over her eyes and secure it tightly before deftly hopping up, and onto the horse, shimmying her backside into position in order to allow her mistress easy access to either of her holes.

“I’m ready, mistress.” Limestone announced, her heart pounding in her chest.

“Good, now remain still while I strap you down, and remember, no peeking.” The voice commanded, to which Limestone nodded as eagerly as ever.

The earth pony could barely contain herself as she felt someone move close to her, their hooves tightening the straps that now bound her limbs. One by one, her hooves were secured tightly against the wooden horse, her body now unable to move more then a few millimeters in any direction. The last thing Limestone felt before the process was complete was something clipping onto her collar before being pulled tight and secured to the horse, ensuring she could not even move her head without permission from her mistress.

Throughout it all Limestone couldn't help but do everything in her power to figure out who this mystery pony was without peeking. Something she only allowed herself to do, as she knew from the moment the pony spoke, that the effort would be wasted. Sure enough, the pony wore a thick, heavy cologne that obscured their natural scent, and even the sound of her hooves against the ground was muffled, as if she was either wearing slippers, or had her limbs enchanted as well as her voice. Whoever the pony was, they had clearly done this before, and were clearly a professional, something that made Limestone twitch needfully, her pussy quaking as a small river of juices dripped down her legs.

“Your a greedy little pet, aren't you?” The voice asked, before chuckling darkly at Limestone’s naked lust.

“Y-yes mistressS!” Limestone yelped as she felt a hoof suddenly smack her ass, making her voice jump several octaves.

“Did I say you could speak, slave?” The voice growled, mere inches from Limestone’s ear.

The earth pony opened her mouth, only to slam it shut and shake her head, more than a little turned on by the suddenly harsher tone of voice.

“That's what I thought.” The voice whispered, receding from the mare’s ear as the voice’s owner walked around her. “You are more well toned than my usual slaves.” The voice remarked, a hint of disdain in it’s tone. “No matter, I will remedy that eventually.”

Limestone gulped, shuddering as she contemplated her new owner’s promise to remake her body. The earth pony nodded, excited by the prospect of what may happen to her in the future.

“Now then, to figure out why you are so stressed.” The voice remarked, it's owner trotting silently around her.

Limestone could feel the eyes of her newest owner as they roved over her body, studying her anatomy carefully as she seemed to contemplate something.

“Muscles are stiff, and react poorly to the touch.” The voice murmured, trailing something soft across the mare’s side and down her flanks, making the earth pony twitch and spasm. “The slave seems unable to relax even while fully strapped… it has been a long time for you, hasn't it?”

Limestone nodded, only slightly ashamed of just how long it had been since she had gone since last she had laid with another.

“It is as I feared then.” The voice whispered, it's owner trotting back around the other side of the earth pony. “You are responsible for much aren't you? Constantly run ragged as you try to keep up to the responsibility placed upon you by family, or perhaps just yourself.”

The bound mare’s jaw hung open, and for a moment she said and did nothing, too shocked by her new owner’s surprising deductive capabilities. A hard smack across her flanks drew her back to reality, making her nod vigorously.

“Ahh yes…” The voice whispered, leaning close to the earth pony’s right. “You are in charge of much and now you must be in charge of nothing.”

Limestone remained stock still, her body twitching as her muscles continued to spasm as her pussy quaked and her heat grew ever stronger.

“From now on you will not be allowed to speak, to nod or shake your head, or so much as move without permission.” The voice stated, leaving no room for argument.

And indeed, Limestone had none, and she fell into the role quickly, not moving so much as an inch while under her owner’s gaze.

“Good, good.” The voice whispered as it continued to circle her, something soft and ticklish brushing across her back and down her spine. “Muscles are far more relaxed already, perhaps next time I may very well take away your ability to breath without permission, but that will have to wait for the next session.”

Despite just how scary it felt to put her life in the hooves of another, there was something there that made Limestone tempted to ask for just such a permission to be taken from her. That would mean breaking the rules given to her by her new owner, and that simply wouldn't do, Limestone didn't want to disappoint and be left without a mistress again, she didn't know if she could handle the stress relief that came with such visits.

“For now I will train you on how best to serve me, and along the way shape your naughty holes to better suit my needs.” The voice remarked dismissively, as if she were merely speaking of the weather, and not breaking in a new pet.

The soft, tickling sensation continued down her spine and ended at the base of the earth pony’s tail, drawing forth another shiver, though this one was far smaller, as Limestone had relaxed considerably over the last several minutes. Despite all the relaxation she felt, there was a small, prideful part of Limestone’s psyche that refused to admit defeat, and give control to another. The small, almost completely hidden rebellious side of the mare was so beaten down that Limestone doubted her mistress would know she secretly felt that way.

“You do not raise your tail for me when you know I am behind you, strange.” The voice remarked, tugging the mare’s tail and making Limestone both wince, and moan in pleasure at the same time.

“Odd. You act as though you have submitted, but your body doesn't seem to agree with you.” Limestone’s owner remarked idly. “Perhaps I had best cut short that rebellious tail of yours and be done with it. What do you think my pet?”

Limestone almost spoke before remembering her place, and clamping her jaw shut tightly.

The voice chuckled at the bound mare’s obvious dismay, her hooves tip toeing around her. “Ahh, good, you do learn. You may speak, but do so only to answer my question.”

“P-please don't cut my tail, mistress.” Limestone muttered weakly, that small, prideful part of herself telling her to not ask, but demand that she do no such thing, an urge that the mare swiftly ignored.

“You stutter, as if unsure of what you want to say.” The voice stated, it's owner turning and facing her, disappointment dripping from her tone. “You should be honored that I would cut your tail, as it would mean the loss of the final, rebellious part of you.”

“I am not ready to have my tail cut short for you mistress, though if you will it, I would braid it.” Limestone offered.

“Ahh, there is the true response.” Her owner whispered, her breathe hot against Limestone’s face as the voice grew closer. “You don't even mind cutting your tail short, do you? I bet you wouldn't mind the pointed stares you would get.”

Limestone gulped, unable to deny it, yet also unable to speak the truth she felt burning in her chest.

“You may keep your tail, for now you must admit to me what you are.” The voice remarked, coming close enough to the mare’s face that Limestone could taste her breathe.

“M-mistress?” Limestone murmured, confused, and aroused in equal measure.

“Tell me what you are, tell me you are the submissive, worthless slut that I see before me.” The voice exclaimed, turning away from her and turning, Limestone’s owner sliding up next to the mare, and pressing her hot, surprisingly well muscled body against her slave’s. “Go on, say it.”

The earth pony opened her mouth, only to close it a second later when no words came.

“So disappointing.” The voice murmured, it's owner’s body pulling away from Limestone and leaving her cold, and alone.

For a split second, all the fears and worries Limestone experienced over the last six months suddenly returned with a vengeance and just when she thought she might resist her owner’s command, she caved. “I’m a worthless, submissive s-slut.” She whispered.

“Oh? What was that I heard?” The voice teased, drawing close, yet not as close as it had been a moment earlier. “Was that a mouse I heard?”

Limestone pushed down her worries and raised her head. “I am a worthless, submissive slut owned by you, my mistress.”

“Ahh so it wasn't a mouse, but rather a rat or ferret.” The voice remarked dismissively.

“I’m a worthless, submissive slut.” Limestone announced, louder still.

“What was that? I was wrong again? No matter, I care very little for the mewling of some cat.” The voice replied.

“I’m a worthless slut fit only to serve as your cock warmer!” Limestone yelled at the top of her voice.

For several seconds the room was nearly completely silent, only the sound of Limestone’s heavy breathing breaking the silence. Only for the voice to suddenly hum approvingly, a riding crop trailing down Limestone’s back before making small circles on the mare’s right flank.

“You mean it, and yet you do not.” Before Limestone could ponder what her new owner meant by that, the riding crop came down hard on the mare’s bare flank, drawing a small moan of pleasure from her. “No matter, I will break you utterly this very night, and that weak admittance will just have to do for now.”

“What did you have planned, mistress?” Limestone asked, wondering just how far the bits she didn't actually have to pay, would go.

“Silence.” Another crack of the crop, and Limestone slammed her mouth shut, stifling a moan of pleasure. “Your ability to speak is rescinded, for now. Remember, my pet, you are an object, a toy, my possession. I will do with you what I will, and you deserve not the knowledge of what those things are.”

Limestone all but giggled, barely able to hold back her excitement. Whoever this was, they had taken to the whole dominatrix thing better than the last pony Limestone gave herself too. The earth pony made a mental note to thank Pinkie for finding whoever this was.

Listening closely, Limestone Pie could hear her new owner trotting behind her, before a hoof suddenly grabbed her tail and yanked it out of the way, tugging it hard. An act that made the bound mare bite down on her tongue, holding back another moan, lest her owner consider that an act of speech.

With no manner of seeing what was happening behind her, Limestone relied solely on her ears and sense of touch to figure out what was happening. True to the voice’s words, Limestone was being told nothing, but something told her that whatever was happening back there, she would figure it out soon.

Sure enough, Limestone heard the distinct sound of a pony standing up on their back legs, right before a pair of forehooves landed on, and gripped, her flanks. The implication was clear, and it was obvious that even without a command being given or a word spoken, that she was about to be fucked, though by what, or where, Limestone didn't know. Pushing down the sliver of worry that was worming it's way into her mind, the bound mare paid close attention to the subtle shifting of the mare’s hooves on her flanks.

The way she shifted seemed to indicate that she was lining up for something, only to pause after a few seconds. Straining her ears, Limestone could hear the sound of something wet squirt out of a bottle, prompting her to wonder what exactly was going on. If it was lube, that was wholly unnecessary, as Limestone was about as wet as one could get, as evidenced by the trail of liquid that dripped down her legs.

If it wasn't for that, then it must be… The mare gulped, her face becoming beet red the second before she felt her assumption become true, and the large, thick head of her owner’s cock suddenly pressed against the tight ring of her asshole. For the moment, it didn't seem like she was willing to push further though, and the bound mare’s owner remained there, taking the time to wipe her lube covered hoof off on Limestone’s neck.

Though the act wasnt purely a sexual one, Limestone still shuddered in pleasure, the sheer fact that she was little more than a cum dump, and a place for her mistress to wipe her hooves exciting her in a way she hadn't experienced in a long time. Pushing down this feeling, Limestone tried to pay attention to the moves of her mistress, hoping to adapt to her desires and prematurely move in order to help fulfill them.

Noticing that her owner’s grip had loosened somewhat, Limestone shifted her butt into a better spot, making sure to not push back against the cock resting against her hole for fear of breaking on of her mistresses’ rules. Sure enough, the other mare’s grip tightened, and she felt the tip of her cock press against her hole. “Be ready slave, for my gentleness ends here.” The voice exclaimed.

Limestone lifted an eyebrow behind the blindfold, wondering what she was talking about, as it was clear that out of all the things her new mistress was, domineering, powerful, demanding, etc, gentle was not one of them. A second later, and the bound mare’s questions were answered swiftly, when her owner grunted, and threw her hips forward, forcing her cock deep into Limestone’s guts.

The head was massive, easily larger than anything Limestone had ever taken in her entire life, and yet she could feel that six plus inches of mare cock was now shoved up her backside in a single push. The fact that she had taken it all was impressive, but Limestone had no time to feel proud of herself, as her new owner did not stop there for long. Her hips drew back slightly before slamming forward once more, drawing forth another grunt from Limestone’s lips, a grunt that quickly morphed into a moan of pain and pleasure.

The agony of having her body so roughly violated mixed so perfectly with the pleasure of penetration that Limestone found it difficult to discern where one began, and the other ended. The bound mare had always been a bit of a masochist, one had to be when you had the amount of responsibility and pressure that Limestone regularly had, but this was nothing like she had felt before.

The pain of being stretched wide, of being fucked so hard, to having the depths of her body ravaged, it all came together to create the most sublime agony Limestone had ever felt before. Nothing had ever come close to this sensation, and the bound mare knew that the only way she would feel this way again, is if she continued to serve her new mistress, something she knew then and there, was something she would do for as long as possible.

Above her, her new mistress continued to plow deeper, her hips pulling back an inch or two before slamming forward again and again. There was no sound other than Limestone’s own breathy moans, which now filled the air. Her owner did not grunt, moan, or seemingly do so much as breathe. With no indication as to what she was feeling, or if she was even enjoying herself Limestone could only hope that she was reveling in the act as much as her pet was.

Inch after inch of thick marecock slid inside her formerly tight hole, filling her to the absolute brim and then some, never stopping for long. Limestone’s own poor amount of experience didn't seem to matter, as the mare’s power was such that fact wasn't even relevant. With a cock that felt more like a battering ram then something made of flesh and blood, the bound mare’s owner plunged ever deeper. Then, just when Limestone was convinced that she was about to run out of ass, the mare pushed forward one last time, and their hips finally met.

With a hard slap, Limestone’s owner’s balls impacted her wet pussy, slamming against the mare’s overstimulated hole and making her shudder once more. Biting down on her bottom lip, Limestone held back another moan, subtly expecting for the worst of her owner’s roughness to be over. After all, she was already balls deep inside her, there was no point in being rough anymore, right?

The bound mare quickly realized just how wrong she was when she felt the dickmare’s hips draw back, only to slam forward once more. She did this relentlessly, slamming herself into Limestone’s ruined asshole over and over. It was so unlike normal sex, that Limestone didn't know how to feel for a few seconds, that was until her leash suddenly unhooked itself from the horse and jerked backwards.

“Hrk.” Limestone grunted, surprised by the sudden move.

It only took a second to adjust to the new position, but during that second of adaptation, her owner continued to violate her asshole repeatedly, driving home her complete and utter domination of Limestone’s body by pulling tight on the leash. Forced to arch her back and press against the mare’s crotch, the mare found herself neck deep in a pleasure so great that she nearly lost herself in it. Everything about the moment she found herself in was perfect, every second bringing on a new and altogether fascinating sensation that she had rarely, if ever, experienced.

So great was this new feeling that Limestone was forced to use every last drop of her willpower to hold back her urge to simply cry out in pleasure. The urge to scream in a mixture of joy and pain was powerful, but not so powerful as to make Limestone break her mistresses’ command. She would not speak, would not utter a word without permission, and nothing would break this conviction.

Said conviction was strained considerably when she felt her mistress begin to speed up, accelerating her already brutal pace to a new, and terrifying height. Something that kept happening even when Limestone was sure she would stop. Yet even when her pace became so fast that the sound of her balls slapping against Limestone’s pussy became near constant, she continued to pound the mare’s asshole ruthlessly. The deep, jackhammering thrusts combined with the incredible pace did its job, and though there was still a considerable amount of pain intermingling with the pleasure Limestone felt, she sensed her orgasm was growing closer.

The sheer fact that she was going to cum from getting her ass fucked so brutally made the sensation come faster and harder, the mare loving every second she was being debased so utterly. “I can feel you getting close my pet.” The voice spoke, breaking the silence that had hung over the room for several tense minutes. “You are not allowed to cum until I do, though I do commend you, I so love a masochist.”

Limestone restrained herself from speaking or shaking her head, forcing her mind to the task of keeping her orgasm at hooves length. This was not a terribly difficult thing, usually, as Limestone had always been a fan of edging, and orgasm denial in general. Now though? Now was different, and under the strain of so much new and foreign pleasure, she found it difficult to keep herself from cumming.

Biting her lip did nothing, as she enjoyed the tinge of pleasure and the taste of copper on her tongue. Instead she forced herself to think of the foulest things she could imagine, from the worst of Pinkie’s puns, to the absolute disaster state that was the south field. Though it helped, and kept her orgasm at bay for now, Limestone knew that wouldn't last long, as the rising tide of pleasure that ebbed and flowed within her was swiftly becoming overwhelming.

Meanwhile, her mistress had thrown any sense of caution, or restraint to the wind and was fucking Limestone’s hole with all the fury of a boxing match. Limestone had long since figured out that her hole would never again be the same shape or size as it was before, but now she also knew that she would never be able to feel this good without being fucked as hard, by something as big as her mistress.

“I’m going to cum soon, and though normally I would not warn you I thought it prudent to let you know that I cum a lot.” The voice announced, only to lean down, while somehow continuing to fuck her without pause. “And when I say a lot, I mean a lot.”

The earth pony with a nearly foot and a half of mare cock rammed up her backside could only shudder in response, unable to keep her pleasure contained, yet also unwilling to release the moan she was holding back. The prospect of having her insides flooded with potent mare seed was a pleasurable one that she had so far been unable to fully indulge in, until today that is.

She wouldn't let that get in the way of her mistresses’ command though, and she forced her mind to stay on the task of holding back her oncoming orgasm. Seconds ticked by, and Limestone quickly found herself running out of thoughts that could help with her task. Her jaw clench tight, her body twitching randomly as pleasure and pain coursed through her sister. Her forehooves clenched and strained against her bindings. All while her new mistress used her asshole so brutally that Limestone felt what little makeup she wore smearing across her face as tears streamed down her cheeks.

Finally, just when she thought she wouldn't be able to hold it back for even another second longer, her mistress paused at the deepest point of Limestone’s hole. The other mare’s entire body suddenly jerked to a stop, on top of Limestone, the soft, her soft, well groomed coat pressing against Limestone’s far less manicured one. A second later, and the bound mare could feel the first wave of seed ripple up her partner’s cock and explode into her body, distracting her to the point that she very nearly lost control and came in response.

Despite this new wave of alien pleasure that was swiftly filling her intestines with seed, Limestone remained firm, holding onto the fleeting remnants of her will. Something she managed to cling to for nearly a minute, during which time her new mistress came continuously, stretching the bound mare in ways she didn't even know were possible. The earth pony could feel her body bloat, her skin stretch and her stomach distend. More seed than Limestone could ever dream of was now resting firmly inside her, making the mare wince as clung to her will even as it seemed to slip out of her grasp.

Just as suddenly as it began, it ended, and in a single fluid motion, Limestone felt her mistress pull out, and slam a plug in place, filling her stretched asshole and keeping the enormous load firmly inside her. Breathing heavily, Limestone sagged against her bindings, the mare only having barely resisted the urge to cum. In the end the battle had been hard fought, and the earth pony’s ears perked up, waiting for the praise she hoped was coming.

“You did well.” The voice began, only for the riding crop to smack the bounce mare across the ass. “For a worthless, no good slut.”

Limestone grit her teeth, her eyes nearly rolling back in her head as she took the insult without complaint.

“You loved that didn't you?” The voice asked, its owner jumping back up onto Limestone’s back before making sure the plug was secure, shoving it a little deeper into the mare’s ass. “You may speak, for now.”

“I did, my mistress.” Limestone whispered, shuddering once more when she felt the mare’s hoof press the toy in deeper still.

“I could feel it you know.” The voice began, its owner settling back onto its own four hooves with a sharp clop of hooves meeting floor. “You were twitching like mad, I could sense just how much you craved release.”

Limestone bit her lip and nodded, her pussy twitching as she felt the weight of her mistresses’ load shift around in her guts.

“Only a worthless fuck toy like you would enjoy such rough treatment.” The voice remarked, with what must have been a smirk. “A real mare would have begged me to stop, to pull out, and to not come back, but you… well you aren't a real mare are you.”

The earth pony felt her head nod before she even consciously decided to do such a thing.

“It's good that you accept your place as nothing more then an object, a receptacle for my lust, and seed.” Her mistress walked past Limestone’s face, batting her cheeks with what felt like a long tail. “Isn't that right, slave?”

“Yes mistress.” Limestone replied instantly.

“You even loved just how much I came inside you. Even now your imaging it aren't you? What it would feel like to have your womb stuffed full of a stranger’s seed.” The voice whispered directly next to Limestone’s ear.

The earth pony could feel her pussy twitch, and a fresh wave of girlcum to run down her legs, she was close, painfully so, her orgasm only moments away, yet all of her usual tricks didn't seem to work.

The riding crop came down hard on the mare’s left flank, leaving behind a bright red spot on the mare’s normally grey backside. “Tell me you loved it. Tell me you enjoyed getting fucked like the worthless fucking toy that you are.”

“I loved it!” Limestone cried, her entire body twitching as the riding crop impacted her flank once more, and bringing about the most powerful orgasm of her entire life.

The bound mare was dimly aware of a shocked gasp, and the sound of hooves taking a step back from her, but she didn't care about that, Limestone didn't care about anything anymore. For nearly thirty seconds she came, her entire body writhing in pleasure as a great river of marecum gushed forth from her pussy, a small amount of which squirted several feet and stained the floor.

When it finally came to an end, and the mare lay limp on the wooden horse, her head hung low, and her leash dangling from her neck, Limestone smiled the first genuine smile in months. Relief the likes of which she hadn't felt in a long time flowed through her, and she couldn't help but feel thankful for the rough treatment she had been given. When she had walked into the basement she had been a pony with hopes, dreams, and many, many responsibilities, now though? Now she was merely a hole to be used and abused by her mistress and that realization gave her peace.

With a sigh on her lips, Limestone was about to thank her mistress only to bite her tongue at the last second and hang her head in defeat, realization dawning over the fact that she had indeed broken a command. “Ahh, you do realize what you did, you have that going for you at least.” The voice remarked with naked disdain.

The voice lost all of that disdain quickly though, and its owner trotted next to the mare, a hoof resting on her flank and squeezing tightly. “You came hard from that didn't you? Harder then probably a long time?” After several tense moments the voice spoke again. “Oh, uh. You may speak.”

“I came harder than I ever had, my mistress.” Limestone replied the instant permission was given back to her.

“Wonderful job slave. You’ve taken one of the final steps. Now, a test. One I hope you pass.” Her mistress trotted between the mare’s legs and gently gripped both of her ass cheeks in her hooves, squeezing them tightly. “You may speak only if you follow this next command.” The other mare leaned close, her soft coat tickling the bound pony’s back. “I want you to beg to be fucked like a real mare. To have your pussy fucked good and properly.”

Limestone opened her mouth to speak, eager to please her new mistress and more then ready to feel the utter destruction the other mare’s massive tool could reek on her other hole. Only she stopped herself at the last second, sensing a hidden undertone to the command that she didn't notice at first. Why would she say a command like that? Why would she use the words she used? It was clear this new, more domineering mistress used the exact vernacular she needed, and for a point no less, but why?

As she pondered the question she felt her mistress continue to grip and squeeze her flanks, but never insistently, never demandingly, allowing Limestone all the time she needed to find the answer to this riddle. She thought about it long and hard, only for her eyes to suddenly light up, as inspiration struck.

Bowing her head, Limestone took on a somber, submissive tone. “I’m afraid I cannot, my mistress.”

“Why is that?” The voice asked, a hint of joy slipping into it’s tone.

“I am not a mare, I am a hole to be used, an object which you can pour your lust into. I have no opinions, what I say, doesn't matter.” Limestone whispered reverantly.

For a split second Limestone could have sworn that she heard what sounded like an excited squeek, but it vanished so quickly that the earth pony couldn't be certain of what she had heard. “Correct, congratulations, you have passed the final test, tell me how you feel my pet. With my permission, of course.”

“I feel… amazing.” Limestone whispered, a large smile crossing her face.

“Excellent, onto the next part of our little session.” The voice announced, its owner trotting behind the mare.

Limestone wondered when it would all end and she would have to go back to being Limestone the hardass and not Limestone the cum dump, but she dare not ask. In part to the fact that she had not received permission to do so, and due to a hidden fear that it may make her mistress remember how late the hour had grown and stop right then and there.

A sudden soft thump on the mare’s back brought her attention to her lower back and the cleft of her ass, where something hot and heavy now lay. “Do you feel that my pet? That is the cock of a real pony, a real mare. A real mare who is going to fuck you like the worthless whore that you are.”

The bound mare all but screamed in pleasure, barely able to contain herself once more. The domineering tone, the sheer confidence, the way it pushed her down and reminded Limestone of her place, it was all perfect, and she could barely wait for what came next.

She expected to feel the plug pull out of her ass, but when that didn't happen she realized that her mistress was going to fuck her, with the toy, and what felt like several litres of cum, still inside her. This fact alone was enough to make her grin, and begin to wonder just what her new mistress had in store for her in the future, assuming this wasn't just a one time thing. Thoughts and images of all the possible ways she could debase the bound mare ran through her head, further adding to her excitement.

Pulling back, her mistress dragged her cock across the mare’s back and between her ass cheeks until it rested firmly against Limestone’s dripping slit. The wide, flat head seemed as hard as ever, and even now she could feel its tip pulse needfully, a tiny jet of pre squirting inside Limestone’s hole. In her mind, Limestone was celebrating the fact that she would finally be filled in the way that had the best chance of easing the heat still burning deep in her gut.

She didn't have to wait long though, as the other mare jerked her hips forward, predictably thrusting forward with the same seemingly limitless strength she had. Even after expecting such a thing, Limestone was still surprised, as this time she had not managed to stuff half of her cock into the bound mare’s hole but rather the entire thing. The unnatural and natural lubricant coming together to give the other mare’s cock just enough slip to it that the other mare was able to bury her entire cock into her slave in a single titanic thrust.

Limestone very nearly came right then and there, and only the unspoken command hanging over kept her from cumming. Her hooves twitched, her body spasmed and her pussy ached as her mistress remained unmoving inside her. Even though she had yet to move, Limestone still knew her hole had been completely and utterly ruined by the mammoth cock. She had been spread more than ever, and like her asshole, had been completely altered to suit her mistresses’ needs.

At this point it felt like her entire body had been forever changed, only her mouth having not been made to fit her mistresses’ perfect cock. Something she knew was only a matter of time, as the other mare had displayed a sort of craving that told Limestone that she would claim every facet of her being eventually. A shiver ran up her spine, and a second later Limestone understood why she had been still, as her mistress leaned down snatched up the bound mare’s dangling leash.

“Ahh, there we are.” The voice announced, before tugging on the leash and forcing the bound mare’s neck to pull back and her back to arch. “You have a nice, tight pussy, or should I say, you used to anyway.” She leaned down, her breathe hot against Limestone’s ear. “I’m going to ruin this hole as well, by the end of it today you are going to be unable to enjoy any other cock then mine.”

Limestone couldn't resist letting out a tiny, almost imperceptable moan, her pussy twitching rhythmically under the constant barrage of demeaning remarks.

“From now on you may speak anytime I ask you a question, and, as always, you must do everything I tell you to, exactly when I tell you to do it. Understood?” The voice half asked, half commanded.

“Yes, my mistress, I am yours to command.” Limestone whispered reverantly.

“Good, now prepare yourself, for I will not be as kind or as slow as I was the first time.” Her mistress remarked, before pulling back her hips.

Behind her now slightly loose blindfold, Limestone’s eyes went with not fear, or confusion, but instead pure and unfiltered delight. Finally, she would truly become the cum dump she was meant to be, and her body would be remade to suit her new mistress in its entirety. She couldn't help but feel as though she had crested some peak, and passed some unspoken test, for now she would truly be at her mistresses mercy for the first time. This was the final test, Limestone realized, to take the other mare’s almost violent love in stride would prove to both herself and her mistress that she was worthy, and maybe then she wouldn't leave like the others had. Limestone didn't have to wait long before her patience, and courage were rewarded.

The tip of her mistresses’ cock pulled out to the point that it almost slipped out, only Limestone’s desperate grasping keeping her inside. A second later and that same cock was pounded deep into her body, plunging so deep so fast that Limestone didn't even realize what happened for a split seconds. Yet when she did realize what happened she didn't have long to contemplate matters, as she pulled out and thrusted forward again, and again, and again.

Each and every thrust was exactly the same, her mistress having apparently perfectly learned the ins and outs of Limestone’s body and enabling her to pull out nearly the entire way before slamming back inside. Over and over, at a pace that left Limestone twitching and broken, she was fucked, the titanic dick spreading her pussy wide and doing exactly as Limestone thought it would.

With each thrust she was being remade, changed, altered to better take her mistresses’ cock, and after only a minute, her assumptions were all but proven. She was hers, completely and utterly, now she had but to stay her orgasm long enough to impress her mistress and her reward would no doubt be massive.

It was all she could do to simply hold on, for her hooves to grip the floor tightly as she braced herself, and actively tried to push back against her mistress’ thrusts. Though the position and straps meant she could only move a few inches, it didn't matter to Limestone, as it meant that at least she wasn't simply laying there and taking it like when she had her ass thoroughly violated. Something her mistress seemed to notice, her breathing coming in harder and faster as her pace stuttered a moment before returning to its normal, breakneck pace.

Though it took nearly all the mare’s efforts, Limestone did what she could to give back to her gentle, and kind mistress. From pushing back, to letting out tiny moans of pleasure, to squeezing down on her cock using her internal muscles, nothing was too small to not try and do. Her mistress was everything, and was worth anything, and if she could put any more effort into the act, then Limestone would gladly do so.

As the pair settled into a rhythm the room became filled with the sound of their love making, from Limestone’s whispered moans, and her mistresses’ heavy breathing, to the soft clap of their hips connecting, it all came together to create an orchestra of lust that filled the room. Like the sounds of their lust filled the air, so too did the scent of that same lust, the pungent aroma of love making clinging to Limestone’s nostrils and filling her senses. The cologne of her mistress seemed to be rubbing off, revealing an almost sweet, and earthy scent, joining with the heavy aroma of sex.

It was strange, disgusting, and Limestone loved every second she was able to experience the heady aroma.

Behind her, her mistress continued to pound deep into Limestone’s body, her cock jackhammering the bound mare’s pussy with all the strength of said hammer. It got to the point that Limestone almost began to wonder if this pony truly was a mare. Sure under their cologne their fur had a hint of sweetness to its scent, fur that was also baby soft to the touch, but the raw power the mare seemed able to produce was so unlike anything Limestone had felt from a dickmare that she wondered if Pinkie Pie had mislead her.

Limestone shook her head, dismissing the thought as quickly as it came, knowing that her sister was many things, but never untrustworthy. As she continued to get railed like the worthless slut she was, Limestone tried her best to distract herself, pondering the question of who exactly was balls deep in her now stretched pussy.

It had to be an earth pony, she figured, as few other beings could contain such strength, and have such endurance. She had, at this point been pounding Limestone’s hole vigorously for what the mare assumed was around fifteen minutes at this point. Yet she showed no signs of slowing, her breathe grew no heavier, her thrusts never wavered in speed, or intensity, and throughout it all she never uttered a word.

A slight shift of her hips drove the next thrust deep into the mare’s pussy and touching a spot that had not yet been violated, drawing Limestone from her musings and forcing her back into reality. Where she was currently getting fucked like there was no tomorrow. There was no true love here, no romance, only the pleasures of flesh, and the act of domination, but that wasn't wholly true. No matter how much Limestone tried to think otherwise, there was a slight undertone of romance here, one she could not avoid.

That thought was also pushed from her mind by another powerful thrust, accented by a hoof smacking her ass. “You like that, slave?” The voice asked.

“Yes my mistress!” Limestone cried, making sure to arch her back as much as possible as her leash was tugged. “I love your cock so very much.”

“Good, because I am about to cum deep inside you, and this time, I will give you everything I have. Which I expect you will keep inside of you, and will not spill so much as a drop of the gift I give you.” Her mistress commanded.

“I will not fail you.” Limestone announced sternly.

“See to it, and I just might invite you back to my personal dungeon when next you return to Ponyville. I think you will find that I can be quite kind to those slaves that deem themselves worthy of my cock.” The bound mare’s mistress announced, having never slowed her thrusting for a single second.

With hope, lust, and other emotions all swirling inside her, Limestone readied herself, her body tense, and waiting for the inevitable. Though she knew not when her mistress would come, she knew that it wouldn't be long, and that she would no doubt spring one last surprise, something she eagerly delivered in the form of numerous fast, and brutal thrusts. Every time she pulled back, it was to the point that the head of her cock nearly fell out, each thrust so powerful that Limestone shifted in her bindings, making the entire wooden horse she was bound to rock forward.

Her lust filled moans grew to the point that she could no longer contain them, and Limestone let loose, letting all hear just how much she enjoyed the rough treatment she was on the receiving end of. There was no doubt in the bound mare’s mind that she was exactly where she should be, that she was anything less than a whore, and that she felt anything other then complete peace.

This brutal treatment didn't last terribly long though, and throughout it all, her mistresses’ tiny, almost imperceptible moans grew louder and louder until Limestone could hear them plain as day. A smile crossed the bound mare’s lips and she laid there, with a manic grin on her face as joy bloomed in her chest. She had done it, she had heard the mare’s true voice and made sure she enjoyed herself as much as Limestone currently was. With that in mind, Limestone grit her teeth and waited, ready for what was coming next.

A sudden jerk, and the absolute stopping of any movement was the last thing Limestone felt before a sudden explosion of seed erupted deep into her pussy, flowing her womb in an instant with potent seed. She didn't think of her heat, or the potential for pregnancy, she didn't consider what may happen to her or if she even wanted this. In that Limestone ceased to be, her personality sublimated by the white hot lust that burned just beneath her skin.

Her mistresses’ massive cock continued to twitch and pulse, the faint indent in made on Limestone’s midsection quickly vanishing as seed was pumped into her womb, bloating her stomach even more. The bindings that had kept her secured fast to the wooden horse had come loose somewhere along the line, allowing Limestone to lift her stomach up, and her head to turn down. What she saw brought a smile to her face, as her stomach had grown to the point that she looked pregnant with twins, and with her mistresses’ orgasm having no end in sight, she knew that it would grow larger still before she was done with her.

A sudden gentle jerk of her leash brought Limestone’s head back, turning and looking as far over her shoulder as she could manage. She was just about to ask what her mistress wanted before she suddenly felt the soft press of lips against her own. In an instant, Limestone melted into the embrace, allowing her mistress to press against her needfully, forcing her lips to part and allow the other mare’s tongue into her mouth.

Seconds passed, and while her mistress explored her mouth, Limestone paid close attention to her waning orgasm, her own having been apparently forgotten amidst everything that had happened. The intensity kept her attention fixated on both her mistresses’ lips and tongue as well as her still pulsing cock. That didn't last long though, and already Limestone could feel her mistress begin to grow soft, and reluctantly begin the process of pulling away from the kiss. Something Limestone held onto for as long as possible, savoring the sweet taste that graced her tongue.

Pulling back, Limestone opened her eyes, to find that light was flickering in the background, revealing a startled butter yellow pegasus with long pink hair staring back at her. They continued to stare at one another for several long seconds before Limestone chuckled suddenly and turned back around. “Well whoever my mistress is, I would like to ask that they secure my blindfold before we continue.” Limestone remarked with a smirk.

“Oh I uh…” The voice paused and took a breathe, her confidence returning. “Absolutely, my pet.”

Limestone grinned, as she felt the blind tighten around the back of her head, firmly closing off her vision once more. “If I may be so bold, I was hoping to know what you had in mind for me next.” Limestone asked, head bowed submissively.

Fluttershy hummed softly to herself, tapping her chin with a hoof. “Tomorrow we will eat cake, play games and celebrate with my friends. After all, it's not everyday one of my slaves gets knocked up.”

Limestone shuddered, the mere thought of being at a party with her mistress somehow making the dreaded social event sound less like a waste of time. “I am sensing a butt in there.” Limestone added.

“Oh there will be something in your butt alright.” Fluttershy giggled. “But that is not all I had in mind, for I think I will make sure to pack your womb with my seed before we go to the party. We need to make sure it takes after all.”

“Yes, my mistress.” Limestone whispered, a blush spreading across her cheeks.

“But first.” Fluttershy grunted as she began to pull out of the mare’s pussy. “I have a third, and final hole to break in.”

The mare deftly slipped from Limestone’s depths, quickly securing a toy in her hole, one which rapidly inflated, securing the load she still had swirling in her pussy, and enabling Limestone to relax her muscles. In the end, she had succeeded, and though the time between Fluttershy pulling out, and the toy filling her wasn't long, Limestone hadn't- spilled a drop.

A content smile spread across the still bound mare’s lips as she waited for Fluttershy to circle around to the front of her. “Yes, my mistress.”

Author's Note

Want to see regularily scheduled updates like this when they are done, rather then the end of the month? Head on over to the patreon and drop a measly three bucks in order to secure your place in the early release club!

Join me over on patreon and get instant access to exclusive content and early looks at new stories, patreon only stories and other great stuff! Check it out!
Or just join the discord to ensure that you dont miss an update.
This update was made possible by the wonderful support of readers like you:
Anonymous, Apollyon, Astor, Azin, Brandon, Brendan, Brenna, Canary in the Coal Mine, Ceepert, Chris, Craig, Diokyo, Doomgooey, facinus, grug, I am unkown, Ian, Ivar, Kali, Lich-lord krosis, M, Makani, Megatyrant, Menthol Qtip, Mephia, mike, mikhaila, mirvra, nfreak, nicky, pacsik, peter, princess pudding, random reader, robert roll, sheq2, shocker blocker, somepony, soundtea, starless, steven, t sparkle, todd Herron, Travis Houck, Vigilant watch, wes, zairvin.