Author's Note

Not a long chapter, but rather fun to write!

Ch 3: Educational Interactions, or, Love in the Brothel

“So, Rarity, let’s see what you have on under this sexy outfit.” Cadance said running her hoof along Rarity’s side and then making circles over her diapered hips where her cutie mark was.

“Though I think we already know.” She added.

Sweetie Belle was watching what Cadance did more than paying attention to Rarity. After all, she already knew exactly what was under that black pvc bodysuit and she also had a pretty good idea as to what Rarity was planning. Cadance however, represented an altogether more interesting unknown. Fluttershy for her part went over to the small, yet equally ornate room’s only sofa and proceeded to slowly settle herself down on it, obviously enjoying the way her soaked diaper squished under her. It would seem she was content to watch for now. For most any other pony Rarity would have insisted that they join in the fun, but she had learned long ago the wisdom of not forcing Fluttershy into things any more quickly than she was willing to do so on her own. When Fluttershy wanted to join them, if she did, she would do it at her own pace.

“I’ll show you what I’ve got on under here if you show me what you have in store for me first.” Rarity said, letting Cadance know that she wasn’t the absolute boss of the situation.

By way of a reply Rarity watched the air around the tip of Cadance’s horn glow pink accompanied by the sound of a zipper from somewhere underneath the pink alicorn. Cadance turned a bit to the side and grinned down at Rarity.

“Well? What do you think, is she big enough for you?”

Rarity managed to not gulp audibly, that would have been just a bit too much of a trope for her peace of mind. But dear Celestia, it was big, and beautiful as well. About half again as long as her own, Rarity guessed. This skin looked slick and wonderfully smooth as the shaft bobbed about underneath Cadance as she turned slightly giving Rarity different views.

“I, uh, I’d very much like that inside me.” Rarity said, inwardly cringing at how much like a desperate filly she was coming across right now. And in front of Sweetie Belle no less. How embarrassing.

“Hehe, I don’t doubt it! But as I recall we had a deal. So may I please see what you have on under there? Cadance said batting her eyelashes in mock innocence.

“O- Of course, just a sec!” Now it was Rarity’s horn who’s turn it was to glow. But in her case she did more than just unzip the area around her crotch. With a bit more telekinetic application she was shrugging out of the shiny bodysuit she had arrived in. The air of the room felt nice and cool on her slightly sweaty fur now that the garment was off.

Cadance made happy sexy noises at finally seeing Rarity’s –originally Sweetie Belle’s- used diaper finally exposed.

And used it certainly was. Almost the entire surface of the slick plastic of the diaper from under her tail to the top of the front was stained a light brown, and the diaper bulged in only the way a truly soaked one could be. Rarity couldn’t be sure but it looked like Cadance’s shaft was even a bit more stiff than it had been just a minute earlier.

That was the point at which a pink hoof pressed into the front of her diaper reminding her of her own very hard cock. And how it was straining against the sloppy poop coated padding embracing it.

“Rarity, Rarity… what would ponies think if they saw what I’m seeing? A mare like you wearing something like this…” Cadance said shaking her head but grinning all the same. Truly you do live up to your reputation as one of the sexiest unicorns in the whole country. I’m proud to be your friend, Rarity.”

The sudden switchover to frank honesty in Cadance’s voice caught Rarity rather off guard.

“I think I’m the one who should be saying that, You’re the princess here after all…”

“Nonsense, anyone should be proud to be your friend.” Cadance said as she leaned in for a kiss.

The two of them locked their muzzles together, tongues fighting for dominance. Cadance’s mouth tasted faintly of… piss? Where had that come from? Rarity wondered. Twilight perhaps? Who knew what the two of them had been up to before she and her sister had shown up. Not that it mattered, Cadance would have tasted wonderful to Rarity just then, no matter what the flavor.

The whole time Cadance’s hoof had been sliding up and down the front of Rarity’s diaper, tracing the outline of her rock hard shaft underneath. She was having to interrupt the tongue wrestling match now to moan with increasing frequency.

“From the sound of things we need to progress to the next stage.” Cadance said, breaking off the kiss.

“Here, let’s give you something comfy to sit in.”

Rarity’s fleeting mental image of one of the plush chairs from the main lounge was swiftly flung away as Cadance lowered herself to the floor and rolled over presenting her underbelly and that long and thick hard shaft to the ceiling. The Princess of Love looked so hot laying there, upside down, mane and tail hair going everywhere. The skin tight pink pvc body suit she still had on added a subtle latex-fetish component to the whole ensemble, making Rarity stare helplessly transfixed. It wasn’t often that she felt so much the inferior in the arena of raw sexuality as this.

A ‘come-hither’ motion from one of Cadance’s hoofs broke the trance and Rarity approached, sensing, but not being quite sure what was expected of her.

Cadance’s other hoof lightly stroked her hard dick.

“Here have a seat, I think you’ll find it quite comfortable.” Cadance said looking meaningfully at her shaft.

Now knowing exactly what the princess had in mind Rarity carefully maneuvered herself so that she was standing with two sets of legs on either side of Cadance’s mid-section so that her diapered crotch was directly above Cadance’s own. Bending her back legs Rarity lowered her behind so that the front of her diaper came to rest directly on top of Cadance’s cock making a wet squelching sound as the full weight of Rarity’s body came down to rest on her diaper and the long shaft underneath it. The pressure also forced her own still diapered cock to press onto Cadance’s doubling the pleasure already coming from her dripping cunt.

Both she and Cadance moaned in unison at the force of the contact. Her diaper was thick and bulky enough that it seemed to envelop Cadance’s shaft. Like two smooth light brown lips gently parting around the length of the enlarged member.

Rarity dragged her upper body forward so that the front and crotch of her messy diaper slipped along Cadance’s length. The smooth warm plastic of the diaper made the princess whimper while Rarity shuddered.

“Mmmm, I bet you like my diaper even more now don't you, Cadance? Rarity asked as she continued to slide her diapered crotch up and down the Princesses’ cock. Rarity’s own felt like it was ready to burst.

“Oh, Rarity, just keep doing this, please!” Cadance said as she gripped Rarity with her forelegs right above Rarity’s hips along the top edge of the diaper.

“Oops! Hehe, I think I’m leaking on you, Cadance…” Rarity said, unable to stifle a giggle. Looking down Rarity watched as brown, foul-smelling fluid dribbled out from the leg holes of Rarity’s diaper and either smeared onto Cadance’s chest or onto the front of the diaper immediately getting spread onto Cadance’s member. The fluid made for a great lubricant, like oil but much kinkier, which allowed Rarity to slide the wet front of her diaper forward and back even faster. Cadance loved the feel and even the smell of the brown liquid dripping everywhere, it made her unbelievably horny. Playing with the bodily waste of another mare was one of the best experiences a pony could have.

“Uuuhhh…Rarity, I need more! Cadance whined.

“I don't think I can fuck you, but I can fuck your diaper, let me get inside it! Please!”

“Oh, don’t worry, you’ll get exactly that!” Rarity said as she decided that as good as her diaper felt on her now, it had a higher calling elsewhere.

“You just lay there and let Rarity do the work.” She winked playfully at Cadance.

With mildly erotic wiggling Rarity teasingly undid the tapes on her diaper one by one while Cadance looked on mildly surprised, she hadn’t expected Rarity to take off her diaper quite so early in the game. As the dripping diaper came free of Rarity’s hips she pulled her tail through and levitated the open diaper in front of Cadance. The inside was a sea of slick brown creamy poop, perfect for any playtime. Equally coated were Rarity’s own long bobbing shaft and pussy. Now fully exposed to the air she shivered in the most delightful way.

With care Rarity’s magic tugged Cadances cock fully upright while still levitating the diaper. With that done, she placed the inside of the sloppy diaper firmly against its length and wrapped it fully around the member, taping it in place. The diaper, taped lengthwise formed a thick tube a bit longer than Cadance’s shaft which was now fully encased at the center. Warm brown liquid began to seep out the bottom and over Cadance’s heavy balls and dripping pussy.

Despite looking a little ridiculous, Rarity knew from personal experience just how much pleasure the diaper was able to bring to Cadance in this way. It was like a fleshlight sex toy for a stallion but a hundred times better. A rock hard shaft wrapped up in a messy diaper was second only to a good poopy fuck.

With her magic, Rarity began to slide the rolled up diaper up and down Cadance’s length while gently squeezing in a rhythmic motion. This was a tequnique she had tried before only on herself on the rare occasion she had no play partner and the occasional stallion who payed well. The problem was that the only mares she was aware of who currently had both complete sets of genitalia were herself, Cadance, and Celestia. Luna, for her part, liked to remain fully female to better fit the feminine role in her relationship with Celesta. This resulted in a distinct lack of potential female partners who had a penis to experiment with. Though Rarity was hardly bothered by this, as a beautiful wet pussy was really all she needed to stay content.

Not to say, of course that she wasn’t currently enjoying herself immensely right now.

Cadance moaned a wriggled on the floor, breaths becoming gasps as Rarity slid the thick messy diaper up and down her shaft with slowly increasing speed and force, like she was pumping for oil.

“You know Cadance, I forgot to mention something important earlier. Would you like to know what that is?” Rarity asked with a sly smile.

“Mmmm…uuuhhh…I…w- what?” Cadance managed, squirming some more at the relentless pumping of the diaper along her shaft.

“You see, this diaper that you’re enjoying so much right now…well, its not actually mine… and neither is the slimy poop inside it you love so much. Yes, I was wearing it, but the pony who made all the mess in it was my sister Sweetie Belle. I just put it on after she took it off.”

Cadance’s eyes got a bit wider at that, she first stared past her thickly diapered shaft at the slick brown gunk coating everything between Rarity’s legs and the pussy and cock located there. Then she focused on the diaper wrapped around her dick that was making such lewd squishing noises as Rarity’s magic field slid it up and down. Finally, she let turned her head to the side where the previously ignored other pair of ponies were.

As they had become increasingly horny watching Cadance and Rarity at their expertise. Sweetie Belle had offered up her jeans shorts covered butt to Fluttershy who had pressed her soaked diapered crotch against it happily and began humping eagerly, her warm pussy lips pressing into the piss soaked padding covering them. Sweetie Belle for her part loved the feeling the smooth plastic bulk of a larger mare’s warm wet diaper being pressed up forcefully under the base of her tail. In addition to being incredibly hot, the feeling was oddly comforting. It just made herself feel good inside having a mare behind her who so obviously enjoyed who she was with.

This was the state of affairs that was present as Cadance looked over to see the filly who was actually responsible for the mess between Rarity’s legs but also the soft squishy scat currently coating her dick.

There was Sweetie Belle, eyes wide open and staring straight back at her, head to the floor and butt sticking up in the air. An oblivious Fluttershy rubbing and bumping her thick diaper against the filly’s butt for all she was worth.

Rarity knew what was going to happen soon now, and so chose that moment to double her speed and force with the diaper.

Cadance’s body surrendered.

“AAAAAHHHHHHHHHH!” Cadance screamed.

Her large heavy balls pumped hot cum into her rock-hard shaft that then propelled the sticky fluid out the tip with such force that most of it splattered onto the ceiling over two meters above her cock’s head.

And then she did the same thing again, and again.

Rarity was more than impressed. Not only was the force of Cadance’s ejaculation greater than anypony aside from Celestia herself, but this was barley a quarter of an hour after the Alicorn has just came hard into Twilight Sparkle. And on that topic, what must have it felt like for Twilight? To have that long shaft spray its thick load into her body with such force? No wonder she was looking to be fucked by Cadance at any opportunity. Rarity was actually a little envious, a feeling she wasn’t used to much anymore. Why did Cadance have to be just a bit too large for her? Perhaps she could convince Twilight to grow her own stallionhood, at least temporarily, so Rarity could have a taste of what it was like.

Rarity slid the rolled up diaper slowly off Cadance’s still hard cock making the alicorn convulse slightly. Her duty to the Princess done, Rarity was now insistent on having her own bit of pleasure. Cadance had unzipped her pvc bodysuit enough to let her balls and shaft free, and in doing so her tight anus was also exposed. Still laying upside down on the floor panting softly Cadance was so vulnerable looking and the exposed butt of an alicorn was not an opportunity Rarity could pass up. Besides, her own shaft was already coated in the best natural lubrication imaginable.

Lining her wide head and not insignificant shaft up with the puckered opening, Rarity eased herself into Cadance’s butt. It was wonderfully tight, but the slick poop coating her dick allowed her to slide in easily. Though only at first. After just a few centimeters in her head squished into a large soft load of poop filling the passageway it was trying to press into. The unexpected resistance made Rarity stop in surprise until she realized what she had encountered.

This knowledge only made here press harder.

As she forced her way into the thick poop, the pressure of her entry made the hot mass flow around her head and shaft, enveloping its full length in a squishy wet embrace. This was in fact the one thing equal to, or better than the diaper fuck she had just given Cadance. What luck! She would have to be sure to make the princess proud.

Without pulling out Rarity simply began moving her hips around in a circle while pumping a little, an excellent way of making the mass of poop surrounding her shaft to squish all about in different directions.

Rarity knew she wasn’t going to last long doing this but she no longer cared, after all, in the end neither had Cadance.

After a minute or two of more steady fucking, of just basking in the feeling of being balls deep in the soft stinky poop of an alicorn princess, Rarity began to feel the muscles in Cadance’s butt begin to contract with impressive force. ‘She’s going to the bathroom with me inside her!’ Rarity laughed to herself. Rarity decided that she wasn’t going to be so easy to expel.

Just as Cadance’s butt pushed on her shaft again, Rarity forced herself in even deeper, now feeling the poop flow around and past her length. The feeling was glorious. Almost immediately poop began to squish out around her hard cock and press into her wide balls as they were forced up against Cadance’s butt. The poop then began to half flow, half drop out onto the floor.

Having anal sex with a pony who was simultaneously pooping was simply too much for Rarity to take in her present state. With a yell almost the match of Cadance she erupted inside the princesses’ shapely butt, pumping thick wads of cum deep into the pony in front of her. The squishing and slapping sounds were hot enough to keep her going for a full minute more, just long enough for her to cum a second time as it happened.

Utterly exhausted, she let herself slip free from the loving embrace of her current partner’s rear and slumped back to sit on the floor.

As Rarity was trying to recover from her exertions Cadance rolled over and sat up.

“Well, we two certainly did enjoy ourselves didn't we? Cadance asked rhetorically.

“I apologize in advance if this disappoints you, but that’s not actually the first time a pony has done that to me with a dirty diaper.”

“It’s not?” Rarity asked, sounding more surprised than disappointed. And here she had thought she had been so creative.

“No…but it was the best job of it anypony has done, and it was the first time that that pony had done so with the dirty diaper of their little sister which they had secretly been wearing all along! That was special!”

Rarity knew she was blushing rather heavily under her fur.

Before being able to come up with an appropriate reply, Cadance made a meaningful gesture at the pile of soft brown poop on the floor between them. Some of it had been splattered around a bit from emerging while Rarity was cumming so forcefully.

“I would think that this is ultimately my fault, wouldn’t you agree Rarity? Cadance asked.

“As such, I think I should find something constructive to do with it. Now that the two of us have had their fun, I believe I have a job to do. As you were so kind as to bring Sweetie Belle here I imagine that you were hoping that your adorable little sister would be able to acquire something of an education tonight?” Cadance asked, already knowing what the answer would be.

“I well, uh, actually yes…” Rarity said, caught off guard by the unexpected frankness of Cadance’s assertion.

Cadance smiled.

With just a glimmer of her magical field Cadance scooped out a little from the slowly spreading mound of poop in front of her and liberally smeared it over her lips like some little foal who had gotten into their mother’s makeup kit and had discovered the lipstick.

“Sweetie Belle…would you come over here please?” Cadance said without looking away from Rarity.

A shuffling ensued as Sweetie Belle removed herself apologetically from underneath Fluttershy who had apparently still been enjoying humping the little filly’s butt with her soaked diaper. And despite a somewhat apprehensive expression she trotted over without hesitation. Rarity was proud of that confidence. It would server her sister well in the future she knew.

As soon as Sweetie Belle had stopped in front of the skinny pink alicorn Cadance leaned forward, poop smeared lips on display.

“Make out with me.” Cadance said.

Standing behind her little sister, Rarity couldn’t see what Sweetie Belle’s expression was or if she had whispered anything, but whatever exchange had gone on made Cadance grin, an action which smeared brown liquid on thoes otherwise glittering white teeth Rarity noted, and locked lips with Sweetie Belle. Both of them were soon moaning softly through the wet squishing sounds their mouths were making.

Rarity became stiff so quickly she surprised herself.

Suddenly, Cadance broke off the kiss.

“Goodness Rarity, and you too Fluttershy, this lesson is meant to be private! I thought you knew!” Cadance said in a shocked sounding voice, despite grinning like a cat.

“Huh? But…?” Rarity started.

“No butts!” Cadance retorted like a stern parent.

“I would suggest that you clean yourself up, then get into a fresh diaper.” Said Cadance waving a hoof in Rarity’s direction.

“And Fluttershy?”

“Y-yes?” Asked the pegasus, not quite courageous enough to meet the princess in the eye.

“How is your diaper doing? Have you messed it yet?”

“No, um, not yet…just very wet.” Fluttershy replied, absently pawing at the front of the bulging plastic front of the disposable diaper.

“That’s fine then, you should still be able to stay in that diaper for quite a while.” Cadance said.

“Off you two go then!” Cadance ordered after a silent pause.
“The two of us will need a few hours at least of uninterrupted time together if I am to do a proper job.”

Rarity exchanged a glance with Fluttershy, the both of them contemplating just what Cadance had in mind for the filly.

As the two of them got up to go, Rarity with her still messy butt and crotch and Fluttershy with her thick, heavy diaper, Rarity turned to Sweetie Belle who was sitting there not knowing quite what to say to any of the ponies around her and looking a little concerned for her life.

Rarity smiled at her sister whose lips were smeared with an Alicorn’s poop.

‘Lucky little filly!’ Rarity thought.

“Have fun, enjoy yourself!” Rarity said quietly.

As the two friends were showing themselves out of the room to return to the central lounge, Rarity turned back for a last fast glance at Sweetie Belle and her new and unexpected, (to her) tutor.

They were already making out again.