"Service" For Family and Friends

The soothingly rhythmical clatter of the Canterlot Express steadily making its way down out of the mountains and into the Celestial valley towards Ponyville was usually something that tended to lull Rarity into a pleasant, though typically brief, sleep. Especially if on days like today when she was returning more toward evening after a long and exhausting trip full of business deals and arranging her appointments as one of the single most favored and trusted of royal courtesans.

Tiring though these activities may be, there was a reason Rarity was now able to afford having her own private train car on these increasingly more common excursions to and from the capitol. There was a time, now several years gone, when she had bemoaned the cost of a single spot on a bench in the standard passenger cars. The jostling and stress of the journey never seemed to do any favors for her carefully maintained outfits or hair. Now though, she thought little of paying a hundred times as much for a bit of privacy, quiet, and most importantly, a personal rail car with better quality suspension.

Looking up from her consideration of one of her many personal clothing sketchbooks, this one featuring ideas for a new line of thong underwear, Rarity smiled at the orange glow of the setting sun, now just sinking below the snowcapped jagged ridges of the Western Ranges. The warm light playfully interacting in unexpected ways with the reflective ice and dark rocks of the pinnacles to form quite dramatic shadows in chasms and glinting surfaces from the sheer walls soaring up into the thin clouds about their summits.

Mentally returning to her immediate surroundings, Rarity turned her head to regard the oh-so-convenient private bathroom of her rail car, its walls made of finely polished hardwood panels, just the same as all the rest of the interior. She considered, not for the first time, how much extra the additional luxury of her own bathroom added onto the price she paid at least once a week for the use of this car. She smiled slightly at the irony of repeatedly paying for something she never seemed to use. After all, on these trips she usually had a thick diaper taped tightly between her legs that was even more convenient and, to be honest with herself, far more enjoyable to use. Of course, simply wearing a diaper was for more than the fun of it. No, she had practical reasons as well. After all, the diapers she regularly wore were of her own design, and Rarity felt that it was a borderline sacred commitment on her part that she personally test everything that she sell, whether it be ball gowns or butt plugs. Therefore, whenever she had a new design of diaper in the works, she had to find the time to try it out. The hour long train ride between Canterlot and Ponyville made for the perfect opportunity to do just that. Not only could she have privacy, but she could try out her newest diaper in just the sort of situation in which many of her customers might well use it. After all, no one had yet seemed to figure out a good way to make using the bathroom on public transportation a relaxing experience without an unfortunate amount of money being required. Her diapers, she hoped, would help solve this problem for many.

This particular train ride was, however, an exception. Rarity was not wearing a diaper at the moment, mostly due to plans she hoped to pursue later on in the night. Though truthfully, the pressure between her legs was beginning to make her wish she was diapered. As much as Rarity longed to simply spread her legs and go where she was, her present outfit made that a difficult prospect. She was currently wearing one of her favorite pairs of black pvc jeans, designed by herself of course. Not only did the smooth and shiny, thick plastic-like material compose the outside of these jeans, but unlike many other, cheaper garments, these had the same material on the inside as well. The tight smooth feeling of the pvc plastic hugging her butt and hips, to say nothing of how it pressed into her pussy and held her long thick dick firmly upright could keep her hard just thinking of it. Despite the jeans being somewhat high-waisted, Rarity was big enough that a good two inches of her cock had a habit of sticking above her waistline in front when she was ‘in the mood’ so to speak. The fact that her current choice of top was a thin translucent, white, nearly sleeveless affair designed to show off her bra, an undergarment made of the same slick and shiny pvc material as her jeans, and that really did nothing to hide anything above the top of thoes jeans would make for an awkward situation if she let herself get too hard with many others to see. It wasn’t really as though she was trying to hide the fact that she currently boasted a fine male member in addition to her well looked after, natural sex. After all, the clothes she wore never did do much to conceal her typically excited state, it was just that she was not in the habit of trying to push the bounds of public decency too far. Yes, Equestria was a very tolerant nation in such respects, but there were limits, especially where male sex organs were involved. However, as Rarity was arriving home at a time when most had already returned home, she was not overly concerned.

‘Perhaps just a little piss…a small trickle won’t hurt.’ Rarity thought, as, inevitably, she grew more excited at the idea of wetting in such a hot outfit. The sudden short burst of hot urine from her pussy, (oddly enough she could choose which sex organ her pee came out of) made her giggle for just a second as it immediately pooled between her butt cheeks as it found little fabric to absorb into. For some reason, this wetness made Rarity even more aware of the tight, thin strap of shiny blue fabric her t-back thong was made from. She loved how its tightness made the thong pull up along her butt as she walked. Sexy clothing was about so much more than just how it looked. It had to feel amazing as well. A good outfit could make Rarity horny with her eyes closed.

She dared not pee any more, as if she did it would all run right down her legs the moment she stood up, and make for a hard to explain mess on the floor. Plus, Celestia only knew what it would do to the expensive varnish on the wood. No, Rarity would just have to wait to do what she wanted in her smooth, shiny jeans.

The distraction of the warm dampness under her butt was interrupted by the realization that the train was beginning to slow and the lights of the station were becoming visible from just out of sight. Shaking her head to get herself fully back to the present situation, Rarity hopped up, and began collecting and packing her things into her small wheeled suitcase. Once upon a time she had liked to travel with a much larger bag, as she liked to maximize her outfit options at her destination, but improved common sense and her business and apartment locations in Canterlot had released her of that burden.  A few swift actions had her sketchbook, notebook, and various pencils and pens stacked neatly on top of a white hoodie which she had learned was useful in the cooler mountain summers of the capitol. Under that were two emergency diapers, which could either be used for on-the-spot demonstrations for potential customers or for her own pleasure if she suddenly found herself craving a diaper between her legs. Under the diapers was hidden a balled up double-strap v-string thong that Rarity had dug out of Sweetie Belle’s dirty clothes pile before going on her trip. Rarity loved to go to sleep with the comforting smell of her little sister by holding her used thong up next to her face when going to bed. Though of course she first liked to rub it over her hard dick until she came.

Rarity stood next to the window of her private car as the train pulled up alongside the station platform. As her car was the second to last of the train, in font of only the caboose, where it pulled up was at the far northern end of the station where the lighting was dim and, hopefully, few others would get out.

Rarity was a bit surprised, though happily so, to see that there were not one but two mares waiting to greet her. There was her twelve-year-old sister Sweetie Belle standing there, looking to Rarity like an angel in the dim light, wearing tight light blue boot-cut styled jeans with a clear plastic belt and a plain light pink top with thin shoulder straps that was tucked securely into the waist of her jeans. Sweetie Belle’s light violet hair was brushed straight and tied back into a long ponytail and the short spike of her horn jutted from the top of her forehead. All of this Rarity noted in an instant thanks to her years as a fashion designer and general expert in how to look sexy. Equally scrutinized was the taller mare with long wavy, almost curly bright pink hair standing next to her sister and, Rarity was quick to note, holding her hand. Pinkie Pie was wearing a top not unlike Sweetie Belle’s in design but the color was a light green and instead of being tucked into anything, it stopped well short of her navel. The small shirt was pulled tightly around a large firm pair of breasts whose wide nipples stood out proudly against the thin fabric. Rarity didn't think she had seen Pinkie wear a bra a day in her life. Though the tops the mare wore were nearly tight enough on their own to serve the same purpose.  Furthermore, as opposed to jeans Pinkie was wearing a very tight and very short pink skirt that Rarity decided was probably made from a material similar to that of the slick and shiny pvc of her own jeans, as it reflected the lights of the train station in a similar plasticky fashion. Rarity’s sharp eye also couldn’t help but note a thin line of white material rising above the top of the garment and that the way the skirt hugged Pinkie’s hips did not seem quite in line with the natural contours of her body, almost as though something thick were underneath. Something like a diaper.

“Hmm… that wouldn’t surprise me in the least.” Rarity mumbled out loud to herself, smiling.

“I’ll have to investigate more thoroughly…”

As soon as the train came to a stop Rarity was on her way out the door. When she had first began to use this luxury service the station had thought to have a personal greeter meet her on the platform as soon as she got off every time, after all, the Canterlot elite always demanded as much, someone had to be there to attend to all their ‘needs’. Rarity had swiftly put an end to that nonsense, she did not like to be carefully watched over by strangers when greeting her sister on the platform. Besides, she was not a needy little poof from the capitol who didn't know a diaper from a dish rag. She very much preferred her independence, thank you very much.

Rarity hadn’t managed three paces across the wooden planks of the station platform before the sound of a girl running and a flurry of violet hair ended with being glomped onto by Sweetie Belle who threw her arms about her neck as Rarity lifted her up off the ground. Admittedly a rather overly dramatic hug as they had only been apart for a day and a half, yet it was a fun little tradition between the two of them nonetheless.

“Hehe, I missed you…” Rarity said as she lowered her sister back to the platform while the two of them touched horns.

“Missed you too! Was it a fun trip? Better than last time?” Sweetie asked staring up at her sister with thoes beautiful wide violet eyes.

“Oh yes, much better! More time with the Princesses, less time with the nobles. Plus, I got to finalize a few important business deals. I might buy you something special in celebration. What do you say to that?” Rarity asked Sweetie Belle whom she still held tightly next to her.

“Really! Like what?” Sweetie asked with all the unabashed excitement of a girl half her age.

“Patience sis,” Rarity said smiling, “You’ll get to see, I’ll come up with something, something…exciting.”

As Rarity spoke, her right hand slid lower and gently but firmly grabbed Sweetie Belle’s right butt cheek through her tight faded jeans, while her left arm pressed her little sister even more firmly against her. Rarity felt her already stiff cock grow even more firm and begin to size above her waist line as Sweetie Belle’s stomach was pressed against it through the tight pvc.

As Rarity held her sister against her and gently squeezed her butt she looked up to see Pinkie Pie still standing there only a few meters away smiling happily and perhaps a tad lustily at the pair of them.  Rarity gave her a wink, which Pinkie returned with a little giggle.

As Rarity looked back down a sudden realization struck her.

“Sweetie dear, I don't recognize these jeans you’re wearing, or rather I do, but not from you. These are Applebloom’s jeans aren't they.”  Rarity stated more than she asked.

Rarity never missed an opportunity to watch Sweetie Belle and her friends if she could help it. Applebloom with her tight t-shirts and tighter jeans, Scootaloo with her sexy daisy duke short shorts and crop tops, and her own sister often in very short denim skirts were enough to make her hard within seconds. Even better were the days when Scootaloo would show up with a diaper on under thoes little shorts. Rarity knew whenever she saw that, that Scootaloo had been with Rainbow Dash earlier in the day as putting the purple haired filly in diapers was one of Rainbow’s ‘things’ she liked to do with the young girl when they had their ‘fun time’.  Over time, Rarity had made a rather complete mental encyclopedia of all the various items of clothing the three girls wore. Sweetie Belle was obviously much easier to figure out than the other two due to living under the same roof.

Therefore, it was not surprising that Rarity had not taken long in figuring out that the jeans now gracing the slim body of the girl wearing them, while similar to several pairs that she did own, were not actually hers.

“Um…yah, A.B. let me borrow them yesterday. She said she wanted to see how I looked in them. She said I looked real nice and wanted me to stay in them for the rest of the day… I guess I never took them off.” Sweetie said while looking down, and though Rarity couldn’t see it, blushing as well.

“You said this was yesterday and you never took them off? Did you sleep in them?” Rarity said smiling all the more.

“Kinda…” Sweetie said reluctantly.

Rarity took the opportunity of her sister’s embarrassed silence to change from squeezing Sweetie’s butt to running her fingers down the seam of her jeans between her butt cheeks and down between her legs. Rarity hadn’t gone far before her fingers began to encounter a dampness in the denim. Instead of stopping, Rarity went on further and began to press the ends of her fingers upward. The area of moisture encountered was too big to be simply from a wet pussy, especially at Sweetie Belle’s age, no, this was from pee. Lifting her fingers to her nose confirmed what Rarity had already known. Her little sister had wet in her friend’s borrowed jeans, and from the relative lack of moisture and smell, she had done so some hours before and yet chose to stay in the wet jeans anyway.

“Well, aren't you a brave girl, not only did you wet in your friend’s jeans, but you did so knowing there was a good chance your sister would find out. I’m actually rather proud of you, it’s good to know what excites you and to not be embarrassed by it, don't you agree?” Rarity said looking down at her little sis while smoothing the hair around her ears.

“Thanks Rarity, um, actually I was going to change before coming here but Pinkie said I should stay in them…so yah. I did.” Sweetie said trying her best to sound confidant.

“That’s very good advice on Pinkie’s part, you should thank her for it. Though I have to ask, what were the two of you up to earlier then?”

An uncomfortable silence from Sweetie followed that question and when Rarity looked up at Pinkie Pie, still standing nearby watching the two of them all she got was a somewhat sheepish smile and a slightly embarrassed look, an uncommon thing from that mare. With one eyebrow raised Rarity looked back down at her sister who as fidgeting slightly, who looked like a dog who had knowingly been slightly too aggressive with the newspaper. Instead of increasing her sister’s discomfort Rarity decided she would just get the details out of Pinkie later.

“In that case, I’m sure that whatever it was, you two had fun. Now Sweetie, stand back and turn around and let sis get a good look at your outfit. I want to know how well I agree with Applebloom.”

Doing as she was instructed, Sweetie Belle released herself from Rarity’s arms, stood back a step, and turned herself away from Rarity. The lighting was dimmer than Rarity would have liked but she could see well enough, and in fact the long shadows in some ways helped to enhance Sweetie belle’s curves. The jeans certainly were wonderfully tight, hugging her hips and skinny yet round butt beautifully. The overall look of the jeans was in fact rather basic. There were no fancy designs, ornamentations, or unnecessary flaps and frills, the back pockets were wide and had a simple, subtle design on them. All the seams were smooth and the light blue denim was worn and faded but nowhere torn. In all they were perfect for showing off a girl’s curves without distracting from the girl herself with their own flashiness. The bootcut design made the legs flair out a bit and cover the back half of Sweetie Belle’s white tennis shoes. This design helped the jeans look more casual and in fact accentuated their tightness higher up. All in all, perfect jeans for a perfect girl. The, by now, mostly dried urine stain running between and down her legs made Rarity’s dick throb. She wanted nothing more right then than to rub it all over Sweetie’s hot twelve-year-old ass until she came.

Collecting herself and remembering that she was not currently in the best place to do such things with a young girl, Rarity wrapped her arms back around her little sis, this time from behind so that Sweetie Belle’s back was up against Rarity’s front. Despite the difference in height, Rarity couldn’t resist bending her knees a bit and press the length of her long hard shaft up against the middle of her little sister’s butt. Even through the pvc plastic of her pants and the girl’s jeans she was sure Sweetie could feel its hardness pressing against her.

“I must say, Applebloom sure was right, you look stunning in thoes jeans. You should be proud of yourself for looking so nice and also be thankful you have friends who know you so well, You’re making me a very happy sister.” Rarity said as she pressed the bulge in her pants even harder against Sweetie’s butt.

“Aww, thanks Rarity, I knew you would like them too, they feel so nice to wear. Applebloom is the best!” Sweetie Belle said happily as she thrust her butt out a bit and wiggled it playfully against Rarity’s rock hard shaft. Rarity closed her eyes and took a deep breath, promising herself that before the night was through she would have a ‘discussion’ with her little sister about the consequences of teasing her so. Unfortunately, that would have to wait.

“Mmm…that makes your sis feel very good, you know that, don’t you?” Rarity asked bending over Sweetie Belle to whisper in her ear. As the same time she put her hands on Sweetie’s hips as she gently began humping her stiff shaft against the twelve year old butt in front of it.

“I know you like how this feels too but we need to wait until later if you want to keep having fun. Also we are keeping Pinkie waiting, which isn’t very nice now is it?

“Ok, ok, I know, but you’re the one who-“

“Yes, I know sis, I’m sorry, I should be better at controlling myself in public shouldn't I?” Rarity said to Sweetie Belle giving the girl one last forceful push in the butt with the large bulge in her pants as a response to Sweetie’s halfheartedly suppressed laugh.

Reluctantly releasing Sweetie Belle, Rarity strode the few quick steps to Pinkie Pie and gave her a light hug. This was immediately returned by another hug from pinkie with about five time the strength, nearly enough to pick Rarity off the ground entirely.

“Ooo! I Missed you so! Lest celebrate your return with-“

“No need Pinkie! Whatever it is, it won’t be necessary.” Rarity said cutting her off.  She had enough ‘parties’ to attend the way it was; she was not enthusiastic about the prospect of even more.

“Oh, all right silly!” Pinkie said as she released Rarity from the bear hug.

“Though I’m sure there is something you would like to do, considering the outfit you’re in.” Pinkie said with a hot smile as she slid a dexterous hand over the still firm shaft of Rarity’s cock through her pvc jeans.

As much as Rarity liked where this was going she had to do something to intervene.

“Really Pinkie, not here!” Rarity said making a show of looking around. No one seemed to still be anywhere near anymore, but anyone could wander by at any time.

“I think it’s time that we headed home. I have no intentions of staying at this station forever. Come Sweetie, let’s get going” Rarity called back to her sister.

On their way out of the station, the station master made a small show of bowing to Rarity when he saw her from the windows of the office and coming out to thank her for her continued patronage of the Ponyville Express. While she graciously accepted the thanks and promised that she had every intention to continue using the train service, she was just a bit annoyed at the unnecessary attention. All she wanted was a quiet walk home in peace, though admittedly it was always nice to be recognized and appreciated. Fortunately, the encounter was brief and within a minute they had left the station well behind.

The three of them walked in silence for a bit. The sun had set, and the deep purples and blues of the oncoming nighttime sky were overhead with the planets and brighter stars just becoming visible. The air was warm and still, an occasional beetle hummed about its business. Rarity held Sweetie Belle’s hand as they walked.  The love they shared didn’t always need words to be expressed, they simply enjoyed being next to each other. Pinkie Pie for her part hummed to herself and strode happily just in front of Rarity, swaying her hips a bit more than was strictly natural Rarity thought. However, it was not Pinkie’s hips strictly speaking that held Rarity’s attention.

The bulge around her hips and butt was made plainly obvious to Rarity thanks to the tight shiny pink skirt the mare in front of her wore. Perhaps to someone else it would have not been so immediately recognizable, but Rarity knew what she was looking for. If the bulge were not obvious enough, about two centimeters worth of white plastic stuck up above the waist line of the skirt, and sometimes the thick crotch of a diaper could just be seen below the hem of the skirt, though it was too dark to make out if the color of the diaper had been changed.  Pinkie obviously wanted Rarity to see what she was wearing with all the subtlety of an earthquake. Even if Pinkie had been working harder to conceal the diaper, Rarity was sure she would have figured it out from the smell. True, it was not strong, and Rarity had not noticed it until being hugged so forcefully back at the station, but it was there. Walking behind Pinkie, Rarity could pick up on the faint stench of a dirty diaper whenever the breeze blew the right way. It was interesting to watch the pink mare as she walked, Rarity had seen a number of her customers come to her to purchase a new set of diapers while wearing an already wet one themselves. Often, there was a bit of a waddle to their movements, almost a natural reaction to the thick padding between their legs.  Pinkie however, showed no sign of caring whatsoever. She walked quite normally, aside from the sexy hip motions, she might have been wearing a thong for all the restriction to her movements she displayed.

Rarity glanced down to her sister walking alongside to her left. Was she watching too? She must be able to smell Pinkie. Heck, they had probably been together for hours already, she had to know.  To her surprise, Rarity caught her sister staring at her, or more specifically at her hip, or butt, it was hard to tell.  She could understand why, as she walked the dim light of the occasional lantern and the whiter light from the rising moon made her slick pvc jeans reflect that light in beautiful undulating ways showing off the roundness of the healthy mare’s body tightly enclosed underneath. Glancing quickly behind to make sure no one was anywhere in sight Rarity spoke quietly to her sister.

“Looks like you are enjoying what you see.” Rarity said, making Sweetie Belle start a bit and then look away apparently embarrassed.

“Don’t be shy now, I’m your sister, not some mare off the street. Here let me help you.”

Rarity took the hand of the girl she was holding and lifted it up and behind her. She then placed that hand firmly on her butt and held it there.  Continuing to hold Sweetie’s hand in place the two continued walking in silence. Without a word, Sweetie Belle soon moved to walk even closer to her sister and began to rub her hand around in small circles while squeezing occasionally. Due to the wonderful ability for pvc plastic to easily transfer heat, Rarity could immediately feel the warmth of Sweetie’s hand on her backside as it circled around. The small motions were inexperienced, yet so full of enjoyment that Rarity had to keep herself from stopping right there and making out with her lovely little sister.  But the quiet sexiness of the situation was a joy to experience in its own right.

It didn’t take more than a minute or two before that adventurous hand dipped its fingers just below Rarity’s waistline in back and hooked onto the strap of her thong. Just a few small tugs made Rarity shiver and she looked down ruefully as she heard a small giggle. She reached her left arm around Sweetie Belle’s shoulder and hugged her close to her side as the inquisitive hand went back to roaming over her butt. Rarity couldn’t help but briefly muse on the fact that her little sister got to do for free what many mares in Canterlot and other cities paid handsomely for.

Lost in their mutual fun, Rarity was almost surprised when she suddenly realized that they were getting quite close to Carousel Boutique, the original home of Rarity’s expanding business empire, having walked nearly all the way across Ponyville.

Also, Rarity realized that Pinkie was still with them, having led them the whole way. Apparently they had business to discuss before parting ways she decided.

“Go on inside Sweetie Belle, Pinkie and I have grown-up stuff to talk about. I’ll be along in just a minute.” Rarity said, detaching herself from her sister.

“Aww… I wanted to watch…” Sweetie Belle said, somewhat under her breath.

A raised eyebrow from Rarity was all the motivation Sweetie Belle needed to do as instructed. Perhaps though, someday, maybe someday soon, she could watch. Rarity considered this, looking on as the slender form of her little sister ran up the steps and opened the front door, Rarity smiled with love for the young girl.  Soon enough warm light was spilling out from behind the front curtains and onto the porch where the two stood.

“You and I have a thing or two to discuss, Pinkie.” Rarity said with a sly smile.

Taking Pinkie’s hand in much the same way she had taken her sister’s just minutes before, Rarity led Pinkie around the circular porch of the structure to the back of the boutique and to a back door that led directly into Rarity’s private work room, which she always kept a light on in. Unlocking the outside door for the both of them, Rarity looked inside and noted that she had locked the inner door as well, the one that led into the boutique proper. Out behind them stretched several acres of farm fields and behind thoes, the dark outline of a forest. That was one of the nice things about living on the edge of town in Rarity’s opinion. Fewer folks to always be watching you.

As soon as the two mares came inside and the bolt on the door was securely fastened, Rarity grabbed Pinkie and kissed her hard, pushing her tongue between the mare’s teeth and licking every crevice she could get to with it. Pinkie of course, happily accepted the intrusion and returned the favor. She also grabbed Rarity’s slick pvc covered butt and squeezed excitedly.  Almost as soon as Rarity began she pulled away. And set pinkie with a stern look.

“So what exactly is it that you are wearing under that mini skirt of yours.” Rarity asked in mock anger.

“I’ve been able to smell it ever since I laid eyes on you this evening.”

“Hehe, they’re my favorite kind of underwear Rarity! Would you like to see? Diapers are the best, most wonderful thing ever! Here, what do you think?” The pink mare asked excitedly.

Lifting up the front of her mini skirt, Pinkie treated Rarity to a truly hot sight. A thick disposable diaper, heavily swollen with pee, yet taped tight enough to not sag was covering all of Pinkie’s crotch and hips. The diaper was large enough and Pinkie slim enough that the padding even wrapped over her thighs. It took Rarity no time at all to identify the diaper as one of her own manufacture with its subtle feminine design of silver lines running around the leg holes and the front clear plastic tape guard or ‘landing strip’ with its small silver star pattern, along with the light pink of the sides of the diaper, which were designed to accentuate the white front and back. Or rather, what would have originally been white.

Upon closer inspection, the front was not discolored just by urine but there was actually a slight brown tent to it. Good Celestia, Rarity thought, how long had Pinkie been in this diaper and how much had she used it? Without thinking Rarity brought her hand up and pressed it into the thick, soaked and apparently messy padding of the front of the diaper. The warmth of the diaper combined with the smooth plastic of its surface made Rarity’s member stand to attention in her pants. Pinkie simply smiled down at Rarity’s hand and covered it with her own, guiding it around the front of her diaper and pressing her fingers in right over where her pussy ought to be.

In turn Rarity took one of Pinkie’s hands and pressed it onto her hard shaft through her pvc jeans.

“I need to see what’s inside that diaper, Pinkie. In fact, what I really want is to be inside of that diaper.”

“Oh, Rarity! I thought you’d never ask!” Pinkie said with her customary delight.

“Diapers are the best thing ever! I know I already said that but it’s so true, I love wearing my very own toilet and peeing in it! And pooping in it! And squishing it all over! And they are even better when you get to have sex in them!” Pinkie continued on without pause while already in the process of unzipping the side of her skirt and then laying it out on the polished wood floor of the small room. It hardly made for much protection from the hard wood due to its small size but neither Pinkie nor Rarity were in munch of a mood to care about such trivial matters.

As soon as her skirt was laid down on the floor Pinkie Pie sat down heavily on it with an audible squish and a moan of pleasure. Now Rarity was desperate to find out what all Pinkie had done in her diaper to cause such a sound. She began to peel off her tight pvc jeans now that she was sure that whatever was going to happen over the next few minutes, her rock hard shaft was going to require unrestricted motion. Pinkie watched with interest as Rarity’s dick was freed from its confines and bobbed about enticingly. Rarity’s skimpy thong, though doing nothing to contain her shaft did still cover her two heavy, smooth balls and her dripping clit.  As Rarity carefully folded her jeans, (she refused to treat them without respect no matter the situation) She decided to keep her thong on, after all, she liked how it felt running up her butt.

Soon Pinkie began to tug at the tapes holding the diaper firmly in place about her body, but Rarity decided she wanted more control over the situation.

“Here, let me do that, you just lie back and relax, Pinkie, let mommy do the work.”

“Ooo… Ok, ‘mommy’, come check out Pinkie’s messy diaper!”  Pinkie said as she lay back onto the floor with her diapered butt positioned directly over the skirt she had laid out

“My pleasure pinkie, I see you have on one of the diapers I gave to you a while back and I want to see how well it has stood up to some obvious heavy use.”

Rarity could have used her horn for such a task, but when it came to diapers she was very much a hands-on kind of gal. Kneeling down over Pinkie, Rarity first laid both her hands on the front of the stinky bulging diaper and enjoyed the warm smoothness of the plastic. She was proud to see that even though obvious brown stains had appeared all around the leg holes of the diaper, there had been little to no leaking. Perhaps there was a bit of poop visible between Pinkie’s inner thighs and the diaper but not much. Unable to help herself, Rarity leaned forward and kissed the front of the diaper, reveling in the stench it gave off making the mare wearing the filthy thing giggle playfully as she gave Rarity’s head a quick squeeze with her legs.

Slowly pulling on the fastening tapes so as not to damage them in any way Rarity released the front of the diaper and pulled it off of Pinkie letting it plop down heavily in front of her. The sight of every square centimeter of diaper and all of Pinkie that had been under said diaper coated in a slick layer of brown paste that glistened in the lamp light made Rarity gasp slightly. This was even more messy than expected, and she had expected a lot. Furthermore, it occurred to her that the smell from the diaper was not just from a recent mess but from poop perhaps more than a day old.

“Oh, my. Pinkie…tell me dear, how long has it been since you changed into this diaper?” Rarity asked. Expecting, and honestly hoping she was correct in her assumption.

“Umm, let’s see now, I put this one on late on Wednesday night before going to bed.” Pinkie said, making a show of being very thoughtful about it.

‘Almost two full days! In the same messy diaper! Pinkie must be immune to diaper rash.’ thought Rarity somewhat incredulous.

“And, uh, how many times have you messed it?” Rarity asked while wrapping her left hand over the shaft of her cock while staring at the outline of the pink haired mare’s pussy, now buried under so much waste.

“Well, I made a big runny poop right after I put it on before going to sleep, then another one after breakfast yesterday, then again last night and again earlier this afternoon… So four times I guess? And I always made sure to squish it around lots to make room for the next load! That's why I like your diapers so much Rarity! They can hold so much! I’ve lost count of how many times I wet it too,”

Rarity shook her head in amazement. Here she thought she stayed in her messy diapers a long time, sometimes most of the day, but here was a girl who had taken things considerably farther.

And that made her incredibly horny.

“Pinkie, please let me fuck you, please?” Said Rarity almost desperately.

“Silly! What do you think I’m laying here for! Dirty diaper sex is what every filly needs!”

Without even bothering with a verbal reply to such a statement Rarity slid her legs under Pinkie’s bent knees, pressed the head of her leaking shaft against the shit smeared pussy before her, and with a single swift movement she was suddenly all the way inside the dirty mare, to the point that her balls were pressed up into the poopy mess coating Pinkie’s crotch.

A pair of deep moans sounded out through the walls and into the still night air of the countryside behind the boutique. Articulate comments were hard for either of the mares to express as they worked at adjusting their positions.

“Ohh… Pinkie, how do you stay so delightfully tight?” Asked Rarity as she began to pull herself about halfway out of Pinkie Pie before thrusting herself back in, the warm shit coating her slick shaft making for an excellent lubricant.

“I’m not that tight silly! You’re just so big!” Pinkie said laughing, as Rarity’s thrusts made wet squishing sounds and caused each other’s breasts to bounce around under their tight tops.

“Perhaps I am, but I still think you’re tight anyway, which is amazing considering how often you have things inside of you.”

Pinkie’s response to that statement disappeared in a series of grunts and moans as she lost her desire, or ability to continue the conversation. Her body was now glistening with sweat as she repeatedly took in the full length of Rarity’s wonderfully large member, the same member that had been granted to Rarity by Princess Luna and subsequently used on half the mares in Canterlot, if any of the stories were to be believed.

Even Rarity had given up on trying to carry on with the conversation, lost as she was in the feel and sight and certainly the smell of having hot, wet sex with a mare in an overly used diaper. The sensations reminded Rarity vividly of her experiences being babysat as a young filly by a teenage mare who thought it fun to let Rarity simply stay in her diapers, which she wore until she had been almost nine, long after she had both wet and messed in them. Far from trying to be cruel, the babysitter, who’s name Rarity had embarrassingly forgotten, had realized that she liked how her diapers felt when used, and decided to not interfere with the filly’s pleasure. Even going so far as to let young Rarity bounce her poopy butt on the young teen’s knee spreading her mess all over in her diaper. Even today, Rarity still got horny remembering the way the poop felt being squished around between her legs as she ran around her parent’s back yard. She could also remember how the babysitter would occasionally come around and put her hand down the front or back of Rarity’s jeans and thoroughly feel the outside of her diaper despite knowing full well she had used it some time ago.

None of these memories however, were being consciously recalled as Rarity swiftly headed towards orgasm. It was embarrassing really, how fast she was ready to cum. After all, she was a practiced expert at making sex last precisely as long as she wanted to and not a second less. However, she usually had not just spent the last half hour doing sexy things with her little sister or fucking a mare who had been in a poopy diaper for two days straight. Plain sex was far more easy for her to deal with in terms of still being able to think logically. This situation however, was simply too much to take. Her cock had been desperate ever since she had first saw her sister and Pinkie on the station platform, and since, in Rarity’s opinion her sister’s body was still too young to actually take her inside, Pinkie had been the logical eventual partner of the night…so far.

Giving up on her thoughts of trying to control herself, Rarity simply erupted deep inside of Pinkie, her cum a hot gooey torrent, each ejaculation accompanied by groans from both mares and eventually a yell from Pinkie as she came, spraying clear fluid all over Rarity’s poop smeared balls. Rarity didn’t let that be an excuse to stop, instead she simply used the new slimy feeling of her own cum, now helping to fill Pinkie, to bring herself to orgasm a second time in as many minutes. Pinkie, for her part, happily went along for the ride, moaning for all she was worth, while Rarity’s deep thrusts repeatedly squished the pink mare’s butt back and forth in the mess of her diaper.

Having finally spent herself, Rarity lowered her body down onto Pinkie Pie, the both of them still breathing heavily.

“So, I’m guessing you liked that.” Rarity said before parting Pinkie’s lips in a short but deep kiss.

“Oh, just a little!” Pinkie said laughing.

“But maybe next time you should be the one in the diaper and I’ll have the cock!”

“That does sound marvelous dear, but you’ll have to ask Cadance or, if you’re brave enough, Luna, if you want a member like mine. I’m afraid I don’t have the magical ‘finesse’ as it were to create my own.” Rarity replied seeming almost disappointed.

“Oh, don’t feel bad Rarity, just be glad you have one to stick inside so many ladies anyway! I don’t care who made it, as long as it fills me up!”

“Stick inside… well, so much for expecting elegant comments from that one.” Rarity mumbled to herself.

“So um, Rarity, assuming you’ve blown you’re load in me as much as you wanted to… could you tape me back up in my diaper? Please?” The Pink haired mare asked, looking as innocent as it was possible for her to do.

“Really Pinkie?” Rarity asked staring down at the girl under her, watching as a goopy stream of her own white cum seeped out of Pinkie’s pussy and pooled into the brown muck coating the insides of the diaper.

“You still want to stay in that thing?”

“Well of course silly pants! Its not like its falling apart yet or anything, and its not leaking either! …much. Anyway, the more I use it the better it feels.” Pinkie stated quite matter-of-factly.

Shaking her head, Rarity sighed and, preferring to use her hands for such things, lifted up the front of the diaper, which she found to be surprisingly heavy, and folded it over back onto the mare lying on it. Pinkie groaned and wiggled herself around a bit as the now cooled squishy mess came back into contact with her crotch and lower stomach. Rarity made it a point to pull the tapes as tight as she thought the diaper could take. After all, if Pinkie was going to keep on wearing the filthy thing, then it might as well be taped up right.

“Pinkie! Hold still!” Rarity admonished as the diapered girl wriggled her hips about trying to eek out as much sensation as possible as the messy diaper was pulled up tight around her.

“Sorry Rarity, it just feels so good on me, especially feeling all your cum mixed in with my mess!”

Sighing, Rarity admitted to herself that Pinkie’s actions, despite being frustrating at times, and, no doubt her words, were making her get hard again.

‘Too late for a third time, I need to get ready for tonight.’  Rarity thought.

“There! All done! Now you can enjoy your, ah, old and extra dirty diaper…again.” Rarity said somewhat dryly. As she finished getting Pinkie back in her quite over used padding.

Oh, thank you so much Rarity! I feel great inside and out now, thanks to all your cum squishing around deep inside my pussy!  Pinkie said standing up and stretching.

But I gotta get going, its about bedtime for the twins now and they always sleep better when they can sleep with me.

“Don’t tell me you’re going to sleep with thoes two while wearing that thing. Won’t the Cakes be angry? You won’t be setting a good example if the twins’ potty training is supposed to stick.” Rarity said with light concern.

“Ok, I won’t tell you then!” Pinkie said, while a mischievous smile spread over her face.

“Anyway the twins wear diapers at night besides, so they might as well learn to enjoy them, right?” Pinkie continued.

“Just…don't do anything too, I don’t know…dirty, with them.” Rarity said, wondering at the double meaning in her own statement.

“Rarity!” Pinkie exclaimed in mock offence.

“I’m the most trustworthy and diaper-experienced mare you could hope for!” I’m perfect for the job!”

“Of course you are Pinkie.” Rarity said, smiling, white doing everything she could think of to not roll her eyes.

“Thanks again Rarity, you’re the best! And next time…” Pinkie said taking one of Rarity’s hands and pressing it firmly against the front of her diaper, which made a wet squelching sound, while reaching out her other hand and firmly taking hold of Rarity’s still exposed and still quite stiff dick.

“I want you up inside my butt as far as you can go while I try to poop at the same time. I want to see if I can still use the bathroom during anal sex. Have always been curious ‘bout that!” Pinkie said, suddenly shifting from sounding sexy to her more typical, bubbly personality.

“Bye now!” Pinkie said, quickly turning and heading out the same back entrance they had come in only minutes before while at the same time pulling on her tight pvc skirt.

Rarity, suddenly standing alone in her private work room could only shake her head at the amazing, though so very odd friends she had made over the years.

As she strode over to retrieve her pants from the counter she had placed them on, Rarity was suddenly struck with the realization that she had to pee, and quite badly at that.

‘Damn, of course I’d only have to pee after Pinkie left. If that crazy girl had only stayed two minutes longer I could have gone in her diaper or even insider her…’ Rarity contemplated.

‘Ah well, no use thinking on it now…’ Rarity decided, somewhat frustrated.

Leaving her workroom, now with windows open to let it recover from the stench of pinkie’s diaper, Rarity quietly padded barefoot through the darkness of her boutique. The mess she had acquired from the diaper of the mare she had just fucked formed a thin slick layer over her cock and between her legs, which she found herself quite enjoying.  As she turned and was about to ascend the stairs up to her private rooms on the second floor of the circular structure the silhouette of a still, curved form laying on the sofa under the far window caught her eye. Pausing, then changing direction towards the sofa, Rarity, on silent feet, went to investigate. The soft silver moonlight through the window reveled the sleeping form of Sweetie Belle. She was lying on her stomach, her arms tucked in next to her, but with her legs laying straight out. The girl must really have been tired to have gone to sleep so quickly after getting back despite her knowing, to some degree, what her older sister and Pinkie were up to. Her eyes slightly damp from gazing down upon the innocent beauty of her little sister, Rarity was quick to realize that the girl was still wearing the same outfit that she had been all evening. Apparently being wet in her friend’s jeans was just as good of a thing to do while sleeping as it was while being awake.

“What’s this?” Rarity quietly asked herself, leaning over her sister. The moonlight, while dim, did a good job of showing Sweetie’s skinny, but nicely rounded butt being hugged tightly by Applebloom’s jeans. Now however, there was much more than a faint damp patch between her legs. Half of her butt was darker than the other half, having been recently wetted, with the girl’s urine no doubt. Rarity, intrigued, considered this a moment. If Sweetie Belle had wet thoes jeans while laying on her side, that would account for the uneven dampness. She had obviously turned over onto her front since then.

“I wonder if she wet on purpose or legitimately ‘wet the bed’ so to speak?” Rarity mumbled to herself, considering the implications. Either way the sight before her, while adorable, somehow made Rarity’s member stand to attention once again.

Along with her newly returned sexual vigor, Rarity was also painfully reminded of her need to urinate and soon. Returning her stare to her little sister and noting the thick clear plastic sheet protecting the sofa from just this sort of occurrence, a wide smile split the mare’s face.  Rarity was a mare that liked projects and chores to be completed fully and without parts left undone. Therefore, while seeing half of Sweetie Belle’s butt newly soaked with pee was a very adorably sexual thing for Rarity, it was also somewhat frustrating. It seemed a job incomplete somehow.

Fortunately, Rarity had just what she needed to complete the task, and if Sweetie Belle did wake up because of it, Rarity doubted very much the girl would mind.

Positioning herself properly, Rarity held her now quite hard shaft in one hand and aimed it at the part of Sweetie’s butt that was more or less dry. She leaned over her little sister to get the head of her cock only inches from the smooth jeans-covered butt before her. Rarity did not want a long arc of piss that would splatter everywhere and potentially get the walls or floor dirty. She was not in a mood to clean up anything more aside from herself tonight.

Relaxing with a soft sigh, Rarity released her hold on her bladder and let the stream of piss shoot along the length of her cock to spray forcefully onto the cute booty laying just below. The amount of piss in her stream almost immediately soaked Sweetie’s left butt cheek and then began to seep down over her thighs and in between her legs. Soon enough the wetness of her butt was quite equally distributed much to Rarity’s pride. Despite having accomplished her immediate goal, Rarity wasn’t done pissing and so moved her stream directly to the center of Sweetie’s butt and continued to let it flow for as long as it would.

As her stream finally dribbled to an end, Sweetie’s barrowed jeans glistened in the moonlight from all the pee soaking them. Rarity could also see the small pond of pee that the girl was now laying in. As Sweetie had not apparently awoken from Rarity’s activities, Rarity wondered if the girl would sleep in it all night. Before she knew it Rarity had her hand firmly holding onto her shaft and was rubbing it up and down.

‘Just like a horny colt’ Rarity thought, bemused at the act of what was effectively simple masturbation. Something that actually she vary rarely ever did as it was not difficult for her to arrange an actual sexual encounter when she found herself horny enough to need release.

Having admitted as much though, the sight before her that had brought her to this sudden strong need to cum, and cum now, was, indeed quite the sight, and worth the private embarrassment.

With humiliating swiftness, Rarity’s slick, sliding hand had a thick shower of cum bursting fourth and splattering over Sweetie Belle’s soaked butt and tight shirt, its thin vinyl shoulder straps and the drops of cum on her upper back sparkling in the moonlight. Sighing, Rarity knelt down to gaze at Sweetie Belles face in the near darkness.

“You're the best sister anyone could possibly hope for, and I love you so much.” Rarity said quietly to the sleeping girl.  After a second one eye opened just a little to peek out at Rarity partially hidden behind light violet hair.

“Thanks Rarity, You’re awesome too…” A sleepy girl’s voice said.

Rarity, surprised and yet in a way not, at the revelation that the girl was indeed awake if only just, slowly stood up while grinning with both love and amusement.

Before turning and leaving the drenched filly to her wet sleep, Rarity reached out a hand and gently squeezed the damp jeans covered butt of the best little sister in the world.