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"...and you know what he said? That the calcite had 'too much impurities'! He fucking asked for natural samples, of course there's gonna be some fucking impurities! So, now the University of Canterlot wants a discount on the whole bloody lot. Aaargh!" To emphasize her point, Limestone bucked an unfortunate pebble so hard it shattered, the fragments raining in the underground pond.
Sitting at her desk near the waterfall, her sister Maud didn't flinch, nor reacted in any noticeable way, simply continuing to study her sample of green obsidian. That's what made Maud such a great pony to complain to, at least in Limestone's opinion. Maud's hidden grotto near Ponyville was also a great place to vent her anger. Lounging in the pool, Limestone showered under the cold waterfall, feeling it cleanse the day's sweat, mud and dust from her coat. The serene mineral water source was truly refreshing, in more ways than one.
Getting her head out of the stream, her wet mane hanging flat on the side, Limestone finished her tirade, "And, obviously, Da just said it was 'thy responsibility', as if everything on the rock farm wasn't already it. Urgh…" She slapped her forehead in the crystalline water, sending little droplets everywhere.
Looking back to where her sister was, Limestone realized Maud wasn't working anymore. Instead, she was staring at Limestone with her usual, expressionless gaze. "Limestone, you need to relax."
"Of course, I need to relax! I fucking want to. But I just can't, no matter what I fucking do."
To Limestone's surprise, Maud stripped down and joined her in the pond, dipping her head in the cool water. "You remember what we used to do to relax?"
Limestone blushed, looking away. "Really? We were just little fillies, sis."
The tiniest hint of a smirk appeared on Maud's lips. "You would feel better if I gave you some relief."
Limestone's pussy heated up, blood rushing in her slit as she remembered those times they had shared in their rooms, years ago on the rock farm. She stared suspiciously at Maud, intrigued by that break in her sister's usual poker face. "Are you messing with me?"
"No."
Limestone shivered, and not just from the chilly water. She had to admit Maud's proposition was awfully tempting, her body aching with long repressed needs. "Hnrg, fine. But I want to do you too."
"Okay." Again, a brief smile passed on Maud's face. She opened up a small cache on the pond's edge, grabbing a soapstone from it. Delicately, she pressed the stone on Limestone's back.
The older sister purred as the exfoliating stone ran along her spine, delightfully scratching her coat all the way from her neck to her dock. Maud repeated the motion, tenderly rubbing Limestone back and flanks. She then moved on to her legs, massaging the sore muscles of her thighs and calves. Finally, Maud shampooed her sister's short mane and tail, leaving her prim and fresh. This treatment was wonderful, and Limestone felt invigorated. However, although the day was really warm outside, Maud's grotto remained cool, and Limestone was starting to feel a bit too refreshed, so the two sisters got out of the water, drying each other with beach towels.
They settled down on Maud's bed, simply enjoying the moment. Without a word, Maud rolled on her back, and spread her hindlegs, Limestone watching with a tender, nostalgic smile, remembering when they used to do this together. Maud forehooves dipped in her vulva, and she gently played with her lower lips, rubbing the plush folds in little circles. A tingle of arousal ran through Limestone's flesh, and she rolled next to Maud, taking the same position.
Craning her neck, Limestone observed her own sex, and tentatively parted her labia. It had been so long since she had masturbated in somepony else’s presence, but she trusted Maud, and even the slight touch of her hoof on her vulva was alluring. Limestone pressed down with her entire hoof on her genitals, beginning with a slow gyration to get herself worked up. It was her favorite technique to wind up after a difficult day, and she let it build her arousal. Soon, her vulva winked, wetting her frog.
At her side, Maud masturbated too. Like when they had been fillies, discovering their bodies and their sexuality, Maud was using a different method to pleasure herself, preferring to run the tip of her hoof through her slit, teasing her own vaginal entrance. Maud was never very loud, or expressive, when she played with herself, even during orgasm, but the telltale signs of her pleasure were there all the same. Her breath turned short, and her tummy made a cute concave each time she exhaled, her legs twitching subtly as her hooves passed her clit.
"Mmmh, you're right. This is nice." Limestone arched her spine and stretched, leaving her pussy to relax for the moment.
Maud paused too, looking at her big sister. "Do you want some toys?"
"Uh, you still have our old chest? I was wondering where it went…"
"No, Marble has that one. I have new ones." Maud hopped off the bed, coming back a few seconds later with a heavy-looking box. "These are my favorites."
Intrigued, Limestone opened the cover and peeked inside. Maud's collection of sex toys was seriously impressive: there were dildos, anal plugs, beads of various sizes, and more, and everything except the straps were made of stone, of course. Limestone picked up a transparent quartz replica of a stallion's phallus, feeling its fine polish with her hooves.
"I really like that one," Maud commented, deadpan. "The flare feels very good in my vagina, and I can use it to show my boyfriend inside me."
"Can I put it in you, sis?"
Maud blinked, twice. "Yes." Without waiting, she laid her forehooves on the edge of the bed, presenting her rump to Limestone and lifting her tail.
Limestone bashfully touched her sister's vulva, feeling the softness of her labia and the wetness in-between, then poked her anus. Very carefully, she lined the crystal dildo with Maud's pussy, and rubbed the flared tip in her slit, coating it with her clear fluids. The lips parted smoothly, and Limestone pushed the toy in her sister. Maud's vagina stretched without issue around it, her flesh gladly accepting it in her privates. The dildo sunk deep in her snatch, gliding along her slick inner walls until it gently brushed her cervix.
As Maud had mentioned, the transparent shaft afforded an impressive view of her vagina, and Limestone peered, fascinated, into her marehood. The lack of light source and the cloudy impurities in the quartz made it impossible to see all the way to Maud's cervix, but it revealed clearly the little ridges and bumps of her vaginal passage. It pulsed around the dildo, Maud's inner muscles contracting along its smooth surface, trying to drive the toy deeper inside, her body instinctively trying to get a stallion to ejaculate in her womb.
Maud let out a low whimper of need. The sound was barely audible, but, as far as Maud was concerned, it might as well have been a scream. Not wanting her little sister to go without pleasure, Limestone pulled out the dildo almost to her slit, then thrusted back in.
"Unf…" Maud eagerly pushed back with her rump, getting the fake cock inside her. An earnest smile on her lips, Limestone pleasured her little sister, sometimes caressing her labia, sometimes teasing her clit.
Her own vulva winked desperately, but for once Limestone could forget about her own needs, simply caring for Maud's satisfaction. She tenderly plunged the crystal penis in her sister's snatch again and again, savoring her little gasps, the panting of her breath, the tremors in her flesh.
As Maud approached her peak, she signaled Limestone to stop. Limestone gently pushed the dildo to her cervix, and left it there, taking her hooves off Maud's rump.
"So, just like old times, sis?" Limestone said, her gravelly voice unusually warm, loving.
"Yes." Maud turned back toward the box of sex toys, her own dildo still comfortably occupying her vagina. "Which one do you want?"
Limestone climbed on Maud's bed, burying her face in the sheets and raising her rump. "Whatever you want. You can choose." There was no reply, but Limestone heard the sound of hooves rummaging in the dildo box.
Maud gently played with Limestone's vulva, then dipped something in her vagina. It wasn't very big, and it just felt tingly rather than exciting. It was also pretty cold, something like polished marble, but that felt nice, soothing some of her inner heat. It warmed quickly, and Maud rubbed every side against Limestone's vaginal walls, getting it wet with her clear secretions.
Limestone was momentarily confused when Maud pulled it out of her pussy, but quickly realized what had just happened: Maud had lubed a butt plug in her vulva. Indeed, it soon pressed on the pucker of her anus. Slick and warm from her own fluids, the plug easily slipped in Limestone's rectum, where it felt significantly bigger than it had in her pussy. There was a nice concave near the hilt for her ponut to comfortably rest around, and it naturally snapped into place.
Maud went back to her box, and Limestone took the opportunity to clench her muscles around the plug, exploring how it made her feel. Limestone didn't use anal plugs very often on her own, but it was certainly a nice experience. Maybe she should buy one.
Limestone's vulva was starting to feel left out, though. Thankfully, Maud came right back, and what she lined up with her folds was definitely bigger than the plug. Limestone moaned as the rock hard dildo sank in her vagina, its polished surface sliding smoothly into her well-lubed passage. The stone glans settled deep in her canal, kissing her cervix.
"Mmmh… so full…" With both her anus and pussy occupied, Limestone was delightfully stretched, the two stone toys rubbing together through the thin membrane separating her rectum and vagina. Like the plug had, the stone absorbed some of her warmth, cooling and refreshing her from inside.
Maud wiggled the dildo in Limestone's pussy, making her shudder. However, Limestone's short gray tail batted her sister's hoof away, and she clenched her vagina around the dildo, keeping it securely inside. She dismounted the bed again, and went to peruse in Maud's collection.
"Show me your butt, sis," Limestone said.
"Okay."
Limestone picked up a big marble attached to a string. Unfortunately, Maud's vulva was still occupied by her quartz dildo, so she couldn't lube it in her vagina. Instead, Limestone popped the ball in her mouth, wetting it with her saliva. She planted a soft kiss on Maud's tailhole, and pushed the marble in with her tongue. Maud's anus spread wide and swallowed the smooth ball, Limestone pushing her tongue in her sister's rectum until the anal toy was completely inside her, with only the string hanging loosely from her tailhole.
"Thank you, Limey. This is nice."
The two sisters lay down on their backs, side by side on the bedsheets, both their vaginas and asses pleasantly full. Limestone gazed tenderly at Maud, admiring the rare pink blush on her cheeks. "Should we trade, like we used to?"
"Yes."
Limestone gently pulled her dildo out, the glistening length slick with her fluids, while Maud did the same with the crystal cock. They gingerly swapped the toys. Limestone held the quartz dildo in her hooves, feeling the warm wetness of her little sister's pussy. She inserted the tip in her own vulva, and pushed it in her vagina, spreading Maud's secretions inside her. Maud groaned as she filled her snatch with Limestone's dildo, completing the exchange.
Limestone sighed happily, simply enjoying Maud's warmth inside her. Slowly, she started to thrust the transparent phallus in and out of her puffy slit, her hindlegs twitching in pleasure. Her labia winked, her flesh yearning for stimulation. Limestone picked up speed, masturbating earnestly next to her little sister. She was panting, and Maud did too, both of them focusing on their own pleasure.
"Mmmh, yes!" Limestone played with her clit, the swollen nub pulsing under her hoof. Her rectum kneaded her anal plug, her pussy doing much the same around Maud's dildo. Limestone felt radiant, the glow of her oncoming climax spreading deep in her barrel, her womb twitching in anticipation of receiving a stallion's seed. Maud had lost her usual stony expression, her mouth instead open in a gasping, panting smile of carefree happiness
Their gazes met. Limestone asked, "Together?"
"Uh-uh."
Limestone didn't need to be asked twice; she poured all her strength in her pussy, her hooves blurry as she worked the dildo as fast as possible. Her cunt produced a wet shlick-shlick-shlick as she relentlessly fucked herself. The scent of her sex and sweat mixed alluringly with Maud's musky fragrance, the scent of mating mares spreading through the grotto.
She couldn’t hold it anymore: Limestone slammed her dildo almost painfully on her cervix, clenching her hindlegs and her butt. She arched her back, and let out a loud whiny, squirming as her orgasm hit her like a rock slide. Limestone tensed, contorting herself and grinning like Pinkie Pie, letting her mind go blank except for the intense, overwhelming pleasure in her sex.
Before she could finish, Limestone felt her sister tremble, and she summoned all her willpower to watch. Maud was beautiful when she climaxed as a filly, and she still was as a mare. Her eyes scrunched close, and she cutely bit her lips to stifle her cry. With only the tiniest of squeals, Maud came, and Limestone embraced her. They hugged tenderly, holding each other tightly as they shared their climaxes. Wonderful contractions rippled through Limestone, radiating from her vulva and her ass, and she felt the same thing happening in Maud's heaving belly.
Limestone nuzzled her sister's forehead, the tension in her flesh slowly fading away, until all she felt was her own thundering heartbeat and ragged breath. Maud had a little smile on her face, a sheepish, goofy expression that amused Limestone. Caught in an unexpected elation, she started to giggle, a little at first, then very loudly. It wasn't to make fun of her sister, but to share her happiness with her.
A certain discomfort in her rump reminded Limestone she still had Maud's dildo in her snatch, and the plug in her tailhole. She squirmed and pulled out the soaked dildo, leaving it on the bedsheets, then did the same for the butt plug. Limestone relaxed, relieved, though she noticed the string coming out of Maud's asshole; she pulled on it, extracting the anal bead from her rectum. Maud yelped as her ponut stretched wide to let it pass. Finally, Limestone recovered the dildo in Maud's vagina, leaving it with the others.
"Aaaah! I needed that, sis." Limestone lounged on Maud's bed, staring at nothing. Her blood carried the warmth of her afterglow throughout her body, blissfully turning her muscles to jelly. She noticed her sister was staring at her. "What?"
"Limey… I haven't seen you happy like that in years."
Limestone looked down at her body like she was expecting to see somepony's else, but her limbs were still wrapped in the same bluish gray fur she had since her birth. Her head flopped back on the pillow. "Yeah, I guess you're right. Mmmh… This feels so good… Though, I feel all sweaty now."
"We can have another bath in the pond."
"Yup, that sounds great. And I want to scrub you too."
"Okay."
As she cleaned her little sister in the freshwater pond, it occurred to Limestone that she had forgotten why she had visited Maud in the first place. Something about an annoying client from Canterlot?
She shrugged. "Whatever…"
It could wait.
The End
