Limestone's Lesson

Two Weeks Later

Pinkie Pie was walking by herself through the desolate-looking field of rocks, which were scattered all around like the tombstones of a forgotten grave. The sun was beaming down harshly upon the barren space, which made her grateful she was wearing a saddlebag with a built-in cooler for the occasion. She kept her head down so the sunlight wouldn’t hit her eyes, which allowed her to see the countless hoofprints and long lines where stones had recently been dragged around. When Pinkie finally looked up to scan the horizon, she sighed when she saw her sister off in the distance.

“NNNNGHHHHH!!!” Limestone, who was dripping with sweat and red in exhaustion, was trying her hardest to push another massive boulder across the field by herself. Usually, she would’ve had the assistance of at least one other pony to make the task easier to complete; however, the mare knew that nopony was coming to help her while she endured her own punishment. She may have already cleared two of the biggest fields since that morning, which would have amounted to a full day’s work by herself if Marble Pie was around. But after her little stunt a couple weeks ago, Limestone was expected to complete her own work, as well as her sisters’, until her court-mandated therapy sessions were complete.

“Mnnnghhhh… UGH!!” Limestone eventually slumped against the boulder with a deep, tired breath that nearly made her collapse on the ground. Her ears twitched when she overheard the sound of galloping hooves, but she chose to ignore it while panting heavily. Her eyes were closed, and her fur was beading with enough sweat to possibly water some of the plants in Cloudy Quartz’s garden. Fortunately for Limestone, she was greeted with a welcoming, almost unbelievable sight when she finally reopened her eyes. “... w… what the…”

Pinkie Pie was standing before her with a concerned look on her face, and held out a water bottle from her cooler. Limestone may have been exhausted and sweating profusely, but she quickly snatched the bottle without asking. Pinkie may have still been rightfully pissed, but she smiled in relief when she saw her sister uncap the bottle and greedily chug the entire thing in one go. After only a couple seconds of drinking, Limestone sighed hoarsely and tossed the empty bottle aside. “HUHHHH!!! Ho… Holy… I needed that…”

Limestone leaned back against the boulder, and tried to catch her breath after rehydrating herself. Meanwhile, Pinkie’s muzzle skewed a bit worriedly when she asked, “Uhhh… You know you can stop for water breaks, right? Mom and Dad told me that themselves.”

“I know, I know…” Limestone continued to breathe heavily, and eventually shook her head to fling all the sweat off her face. Pinkie reeled back with a foreleg over her face, not wanting to be hit with her sister’s sweat. Limestone eventually let out another deep sigh, but remained against the boulder when she muttered, “I just… I just wanted to get this done before sundown…”

Pinkie’s muzzle pursed tightly with an uneasy expression on her face. If it wasn’t for past events, she likely would’ve offered to help Limestone out a little. But considering how badly both she and Marble were affected by the mare’s “punishment” session, Pinkie didn’t want to give her much of a break aside from some extra water. Fortunately for Limestone’s sake, Pinkie was at least able to not scowl down at her in anger; instead, she waited for her sister to regain her strength while her muzzle was skewed in sympathy.

“S-So, uhhhh…” Limestone looked up at Pinkie after regaining her breath, and blinked a couple times in confusion. “Whe… When did you come back from Ponyville?”

“This morning, actually. I’m only staying for the night to check on Marble before heading back tomorrow.”

“Alright, that’s… t-that’s good…” Limestone nodded her head, and averted her eyes from Pinkie in guilt. Her face was already red from the strenuous work she already did, but Pinkie could tell that her sister was trying not to blush in embarrassment. She didn’t say anything, and waited for Limestone to say anything else. “So, uhhhh… is… is she okay?”

Pinkie didn’t try to show much emotion on her face, but she softened a bit when she heard her sister’s concerned tone. Regardless of what may have occurred, she was grateful that Limestone at least knew what she did was wrong. Nevertheless, Pinkie merely sighed and shrugged her shoulders. “Well, she seemed to be pretty comfortable relaxing inside. Although, uhhh… she kinda wanted to be alone for a while. That’s why I came out here.”

“Right, right…” Limestone nodded lightly, not blaming Marble one bit for needing privacy. She eventually closed her eyes, and hung her head to breathe out sharply in guilt. “Ugh! She won’t even let me be in the same room as her! I had to sleep on the living room couch for the past week!”

“Well, do you blame her?!”

Limestone’s head shot right up, and she stared back at Pinkie Pie in shock. The pink mare grew an agitated glare that Limestone hadn’t seen since the kitchen incident; except this time, there was nothing to distract Pinkie from laying in to her about her actions. “Seriously, do you have ANY idea how wrong that all was?! I was CRYING when I ran to the train station after cleaning up!! And Mom and Dad told me that Marble stayed in their bed for a week straight!!”

“I know! I know…” Limestone hung her head and tried to cover her face with both hooves. It did nothing to dissipate Pinkie’s livid glare, but Limestone tried her hardest to speak up in defense. “I’m sorry, okay?! I know it was bad now, I just… I didn’t mean for it to go that far…”

“GO THAT FAR?!?” Now Pinkie was getting really pissed. “Limestone, you held both of HOSTAGE!!! You humiliated us!!! You were getting OFF to us suffering like that!! That wasn’t just ‘bad,’ Limestone! That was… T-That was really FUCKED UP!!!”

Limestone dropped her hooves to gawk up at her sister in shock. The pink mare was still brimming furiously, not caring one bit that she just cussed full-volume at her sister. It was fortunate that they were by themselves in the rock fields where nopony could hear them; although, Limestone was sure their parents would’ve let that expletive slide in that specific case. Eventually, Limestone sighed and closed her eyes to avoid Pinkie’s livid stare.

“I… I deserve that…” Limestone spoke softly, almost mimicking Marble’s usual tone of voice. Pinkie’s angered sneer lessened quite a bit, and she tried to calm herself down when she saw how upset her sister was looking. “Look, I… I don’t blame you for being so mad at me, okay? I… I don’t have any excuse for what I did, and… a-and I fully accept how much you hate me.”

That last part caused Pinkie’s glare to disappear completely. “Whoa, WHOA! Limestone, NO! I… I don’t hate you!”

Limestone glanced up at her with a flat, disbelieving expression. That caused Pinkie to scoff and roll her eyes. “I mean, I might be mad at you for what you did, but I would never hate you! You’re still family no matter what! I just… I think I just needed to vent a little after everything that happened…”

Pinkie averted her eyes for a moment, which gave Limestone just enough time to pull herself off the rock. She cautiously walked up to her sister, and leaned in to give her a hug. Pinkie grimaced a little from how dirty and sweaty Limestone felt; but at the same time, the mare was able to close her eyes and hug Limestone back. “Hey, hey… it’s okay, Limestone…”

It took everything in her not to start sobbing into Pinkie’s shoulder. For well over a minute, the mares hugged it out in silence without anything to distract them. Limestone remained silent in her sister’s embrace, but Pinkie could hear her sniffling a couple times. By the time the two finally pulled away, Limestone quickly wiped her face with the back of her foreleg. “S-Sorry, I just… I’m not gonna lie, I was worried you would hit me or something.”

“Hmph~ Well, you should be glad I didn’t.” Pinkie tried to shoot her sister a teasing smirk, before rolling her eyes with a shrug. “I mean… if it wasn’t for what Mom and Dad told me, I might’ve actually considered it.”

“Huh?” Limestone turned back towards her with a more pulled look. “Wait, what do you mean by that? Did… Did they say something to you?”

“Well, they wrote to me after I left last time…” Pinkie motioned towards the other side of the boulder, where there was a large enough shade for herself and Limestone to perch underneath. The two sat down on the barren ground, with Pinkie pulling out another couple of water bottles. Limestone began to sip on her own, while Pinkie held hers in her hoof briefly. “But uhhh… yeah, they mentioned what happened at the courthouse earlier this month. About that ‘therapist’ you had?”

“Ughhhh…” As soon as she pulled the bottle away from her lips, Limestone grimaced bitterly while looking away from her sister. “Yeah… believe me, I’m just as shocked as you.”

“So, you had no idea he wasn’t a real therapist?”

“NO! I didn’t! None of us did!” Limestone turned back to Pinkie with an upset look on her face. “That guy was working with me for MONTHS! I told him so many of my personal secrets, just to find out he was some old pervert who wanted me to have a diaper kink!”

Pinkie didn’t say anything out loud, but she reeled her head away for a moment and thought to herself, ‘Well, he certainly succeeded there…’

“... and you know what the worst part is?” Limestone turned away from Pinkie to stare down at the ground. She closed her eyes, and sighed softly before speaking in a more saddened tone. “He… He actually helped me out a lot. Like… say what you want about his methods, but they really did make me less violent and prone to outbursts. I was able to actually stop and like… think things over logically, you know?”

Pinkie stared at her sister with a semi-sympathetic look; however, one of her brows raised when she flatly asked, “Logically?”

“W-Well, not during THAT! I already know that very well!” Limestone pinched the bridge of her snout with a hoof and shook her head. “Ughhhh… I just mean… It… It helped me…”

When she finally pulled her hoof away, Limestone kept her head away from Pinkie to keep her from seeing her embarrassed blush. “L-Listen, I… I don’t know how to say it out loud, but I don’t wanna be dishonest with you either! I just mean tha--”

“Hey, it’s okay…” Pinkie leaned in to wrap a hoof around her sister’s shoulder. “You don’t have to explain,” she said assuredly with a warm smile. “You needed a way to stop being so cranky, and you found a solution that helped. That’s perfectly fine, Limestone! Heck, I know a few ponies who enjoy, uhhh… that too…”

Limestone quickly turned her head to stare at her wide-eyed. “What!?”

“Not me!” Pinkie Pie was very quick to pull her hoof away and say that with insistence. “Seriously, I just wanna make that one hundred percent clear! But uhhhh…” She then looked away from Limestone briefly, and shrugged before confessing, “Let’s just say, I… I have a friend or two who might have, errrr… been jealous if I told them what happened…”

Limestone looked away from her sister to mouth out a silent “Whoa” through her muzzle. But before anything else could be said, Pinkie shot back at her, “But that does NOT excuse what you did, alright?! You can’t just FORCE ponies to do that kind of stuff!”

Limestone knew her sister was undoubtedly right, but she still rolled her eyes and pointed out, “Oh yeah, let me just ask somepony in town then! I’m sure that’ll work out fine!”

Pinkie looked like she wanted to say something, but she decided to drop it with a wave of her hoof. She could tell that Limestone was already guilty for what had happened, and was currently paying the price with their parents’ punishment for her. So instead of telling her something she likely already heard a hundred times before, Pinkie breathed out softly and said, “I just mean… Look, if you wanna keep doing, uhhhh… that yourself… I promise I won’t judge.”

Limestone almost wanted to say something about how their parents threw out all her baby gear, but she didn’t want to remind herself of that and get pissed again. Fortunately, the sentiment of Pinkie’s words was enough to make her glance up at her with a hopeful smile. “You… You’re serious, Pinkie?”

“Cross my heart, hope to fly. Stick a cupcake in my eye!” Pinkie Pie smiled sincerely as she made the motions of her Pinkie Promise, much to Limestone’s surprise and relief. “I promise you, Limestone. If you enjoy being padded, your secret’s safe with me!”

Limestone had no idea what came over her, but that promise was reassuring enough to make her hug Pinkie tightly. The pink mare hugged her back with no issue, appreciating the sentiment they could still carry for one another. However, as soon as the two finished hugging, Pinkie kept a tight grip on her shoulders as she shot her sister a deep and murderous glare. “But don’t you ever… EVER force me or Marble into doing that again!”

Limestone didn’t even hesitate to hold out a hoof and frantically recite the oath, “C-Cross my heart, hope to fly, stick a cupcake in my eye! I SWEAR!”

“Hmph~” Pinkie instantly went right back to smiling cheerfully, and nodded her head in approval. “Alright then! Since we got all that straightened out…”

Pinkie was the first to stand back up, and she drank her bottle of water before leaving the saddlebag beside Limestone’s boulder. “I have a few more bottles in there for you, so try to pace yourself, okay? Mom and Dad wanted me to go with them into town for some errands, but I wanted to make sure things were cool before I went.”

“Oh! Uhhh, thanks…” Limestone got herself back to her hooves, feeling significantly better after that little break to chat with her sister. She smiled when she saw the cooler of drinks, which’ll definitely lessen the time spent trotting up and down the fields for rehydration. But before Pinkie could trot back to the farmhouse by herself, Limestone tried to speak up and ask, “W-Wait! Uhhh… before you go…”

Pinkie paused and turned around. Limestone was blushing hard, but it was mostly out of guilt as she looked away from her sheepishly. “I, uhhhh… I know I screwed up big-time, so if… if you ever need a big favor to ask me… Just know that I owe you one.”

Pinkie smiled back at her kindly, and nodded without hesitation. “I’ll definitely make sure to remember that.”

With that, Pinkie hopped away from the boulder cheerfully, leaving her sister to stand all alone in the fields once more. Limestone finished her water bottle by the time Pinkie disappeared from sight, and she tossed it with a groan as she looked back at the massive rock. “Well… back to work, I suppose…”

A few hours later…

The sun was almost reaching the eastern horizon, but the farmhouse still seemed empty when Limestone finally returned from the fields. The mare was panting like a true workhorse, and was covered from head to hooves in dust and sweat. She groggily walked over to the downstairs bathroom, not even closing the door behind her before taking a long cold shower. As the mare gave herself a much-deserved cleaning, the rest of the farmhouse laid completely still.

Limestone eventually dried herself off, and grunted as she tried to trot up the stairs on weak knees. “Jeeze, how long were they supposed to be out for?” she muttered to herself tiredly. “I swear, the walk to town shouldn’t take that long…”

By the time she reached the top of the stairs, the only light she could see was beneath the closed bedroom door. Limestone wasn’t thinking clearly, and made a beeline for the room so she could collapse on her bed instead of the couch downstairs. The knob wasn’t locked, which meant that Marble Pie was given no warning for her sister coming into the room. And because of that, both mares gasped at the same time the moment they met eyes. “W-WHAT THE?!”

Limestone couldn’t say anything else, and just stood at the open doorway with her eyes nearly bulging out of her skull. Her face practically exploded with a heavy blush, and her eyes went unblinking as she gawked down at her sister. Her muzzle was agape and silent, although it was doubtful she had much to say in that particular moment. Meanwhile, Marble Pie looked just as surprised and worried as the mare staring back at her.

Marble was lying on the floor of the bedroom, with Limestone’s discarded diaper bag beside her and opened up. She was on top of the changing mat, with an opened diaper already unfolded and underneath her rump. Marble was splayed out in a full spread-eagle stance, with her exposed marehood already dusted with white baby powder. And much like Limestone, who slowly tilted her head in total confoundment, Marble Pie wasn’t able to say a word while her mouth was wide open.

“... uhhhhhh…” Limestone didn’t want to do anything too hasty, especially since she was already on the thinnest of ice with her sister. However, as her eyes scanned all the items already laid out around Marble’s pre-diapered form, her blush deepened quite a bit in realization. Not only did Marble Pie have all the diapering supplies out to get herself comfortably padded in private; but beside the open diaper bag, Limestone noticed two particular items she knew weren’t packed in there herself.

One was a small glass bottle, with the tag on the front clearly labeling it Maltitol. Exactly the same as the key ingredient in those sugar-free gummy bears.

The second was a new pair of fuzzy hoofcuffs, with the key laying right beside it for easy access.

To say the very least, Limestone was at an obvious loss for words. She couldn’t think of anything to say; but in that moment, it was clear that both of the sisters knew what was up. Part of her wanted to just back away and close the door, silently vowing to never discuss this incident with her sister again. However, her eyes darted between that bottle and Marble Pie’s face before she heard herself speak:

“.... did… did you already take some of that?”

Marble Pie wasn’t able to mutter out a peep, even after being caught in the middle of diapering herself. It took her a moment to realize what her sister meant, but she noticed the bottle of maltitol beside her diaper bag. She blushed even heavier in realization, and slowly turned back towards Limestone’s stunned stare. After a couple seconds, Marble Pie responded with a soft nod of her head. “... mhmm…”

“Oh, ummm… a-alright…” Limestone felt much less confident with herself than she had a couple weeks ago. However, the sight of her sister willingly indulging was enough to make her gulp audibly. She breathed out before taking a single step into the bedroom. Marble didn’t seem to freak out, or even look upset by her coming in closer. Because of that, Limestone decided to ask, “Do you… n-need any help with that?~”

Pinkie Pie’s threat from earlier may have been ringing alarm bells in her head; however, she distinctly remembered that her sister said not to force Marble into it again, with no clarification on consensual usage. Limestone tried to give her sister a blushy smile, hopeful that it appeared more helpful than it did hopeful. Marble Pie was still frozen atop her unfolded diaper, but her legs squirmed the tiniest bit at her sister’s question. She closed her eyes to take a calming breath, and eventually reopened them with a meager smile. She slowly reached over towards the hoofcuffs, and took them and the key in a single hoof. Before laying back atop her mat, Marble Pie blushed profusely as she held out the cuffs, and gave Limestone a nervous smile.

“... p… please~”

Limestone didn’t need to be asked twice, and grinned excitedly as she walked into the bedroom. The door was shut behind her, and only a metallic click from the lock could be heard before muffled giggling through the door.

The End