Author's Notes:

Apologies all around for taking so long to get this published. I started writing this chapter back in um, March, I think. but my professional life tends to take over for long periods of time and honestly, my interest in MLP has wained some for me this year as well, at least so far as the show itself is concerned. But fortunately for you all, I still enjoy writing about ponies doing naughty things in diapers. Some might be disappointed that this chapter is not as hot and heavy as you might have come to expect from me, but I wrote this to help set up the events in upcoming chapters. If I'm going to write about diaper transformation, I want it done right, which means lots of background concepts and scene development. Also I would like to comfort my readers by promising that this story will not get onto any dark subjects or storylines, as some diaper transformation stories (and images) often do.

When approaching Canterlot Castle on days like this one where thick banks of grey clouds hung low over the valley and obscured all but the foot of the great mountain range whose lower slopes play host to the tiered city of Canterlot, the sense of mystery and hidden grandeur of the ancient castle always managed to excite Twilight. No matter that she had practically grown up there and used it as nothing less than a second home for many years.

The choice to have the castle built on a wide ledge separated from the valley floor by high cliffs of hard granite stone five hundred meters high, and placed next to a powerful foaming cascade, had been one of the most daring architectural decisions made in Equestrian history. Yes, there were a multitude of ancient castles and keeps, many now little more than tumbled ruins, some still inhabited by the descendants of once powerful noble houses that occupied even higher mountain peaks than this Castle, but none of them held a perch that was quite so…dynamic in its character.

Flying in a wide downward curving arc, Twilight partially circled the castle’s highest towers, which appeared and disappeared behind veils of mist and occasional sheets of rain. For the inexperienced, a quite dangerous thing to do, but Twilight knew exactly where she was in relation to the pinnacles of finely crafted white stone with only a fleeting glance of a specific spire or window seen through the scuttling clouds to guide her.

As she spiraled in, a group of four pegasi guards on patrol swooped in quite close to her as she approached near the highest of the towers making sure that nothing dangerous was attempting to sneak towards thoes they were sworn to defend. Seeing it was Twilight who was soaring in and out of view they snapped sharp coordinated salutes and banked hard up into the clouds, disappearing again in their constant vigilance for invasion, be it obvious or subtle.

Twilight couldn’t suppress the stray thought that even had the guards wished to stop her, there was nothing they could have done. Ten times their number would have been unable to resist the power she could bring to bear.

“One princess is an army, and as such needs to behave with all the combined honor and responsibility of any thousand solders of the Royal Guard.” Something that Luna had told Twilight in a private conversation a few years back. Twilight had thought it a slightly harsh bit of advice at the time. Though since Luna had lived most of her life during a time when the Royal Guard had been rather less ceremonial than it was today, Twilight supposed it was simply Luna’s version of good wisdom, and not meant to be overbearing.

Landing as lightly as possible on the semi-circular balcony perched near the top of one of the taller towers, Twilight folded her wings down and shook herself a bit to rid her fur of the water droplets clinging to it while walking below the awning of the conical roof.

The gilded glass doors were standing open, just wide enough in fact, to admit a Twilight sized pony, the sign of expert castle servants, Twilight knew.

She slipped in, hooves finding themselves on a plush and intricately woven rug of blue and bronze colored thread.

Nopony other than herself was to be found within the ornate stone chamber. Though somehow the room managed to appear quite cozy with its thick stone walls and large fireplace, despite being a good hundred fifty meters above the castle’s court yard below. Twilight never knew quite what to make of that, a cozy room should be near to the ground, not perched up here like some griffon nest. The dichotomy of impressions was simply odd.

Being careful that her saddlebags didn't knock into anything delectate or otherwise make a sound, Twilight trotted, unhurried, around behind the large, ancient wooden desk that had been set up for her. Its polished Rosewood paneling depicting carved scenes of various great events in Equestrian history.

Twilight had requisitioned this room, and the desk, among other various effects of state for her temporary office while the restoration of Everfree Castle was proceeding. If all went to plan she would be able to move in permanently in only a few years, quite a short time considering that the only original part of the castle to really be salvageable was the stone walls, and even those had suffered damage and collapse in a few places. Fortunately, Celesta had seen no problem in granting Twilight the use of this tower as her headquarters in the capitol for the time being. And the large bay windows across the room from her desk did have quite the magnificent view. When it wasn’t cloudy and drizzling rain that is.

Though sighing at the rivulets of rain water on the window glass, she nonetheless felt content. Her morning had, after all, hardly been without its pleasures, and despite the beginning of a new week of responsibilities, she was sure to work in more fun for herself and friends.

Placing her saddlebags to her right behind the desk she hopped up into the wide padded chair, another nice piece taken out of the storage rooms, its wood so dark it was nearly black.

Settling in to her work Twilight ran her eyes over the assortment of documents spread around the surface of the desk. Some had been there since last week while others had been delivered by the Head Butler since she had last been in this office, a delivery only a master servant had permission to carry out as only a pony with a lifetime’s loyal service could be allowed to enter the offices of royalty unwatched. There was a transfer of funds form that would approve the transfer of 3.6 million bits to the Everfree Castle restoration project from the Lunar Bank, enough for the next 6 months of work. A petition for further land grants to the Lord and Lady Trumpetvine in the north-central foothills of the Unicorn Range. Twilight scowled at this, judging from similar past petitions, they were hoping to build another summer lodge in the area and wanted it to be on as much property as possible. Twilight decided she would be pleased if she could find some way to deny them. The aristocracy should deserve what the crown provided by doing good works for the nation, not have gifts heaped upon them simply for existing. If that were not enough, the very fact this petition was on her desk and not Celestia’s indicated that the Lord and Lady knew Celestia would have none of it, and were hoping to bypass her authority by going to Twilight directly. An unfortunately common occurrence these days. Another letter buried near the middle of the stack though, made her smile when she saw the cream-colored envelope with red accent lines drawn about the edges. Addressed to her from a certain Dr. Oldstone, it was sure to be his monthly update on the progress of the archeological digs in the Central plains north of the Unicorn range. She was tempted to open it immediately but forced herself to be patient, there were a few dozen more practical if boring documents to attend to first and it would not do to be distracted.

No sooner had she thought this though, then she looked at another letter, the last one in the stack, as the light lavender color of the envelope caught her eye.

It was addressed to her from Moondancer.

Not such a surprising thing as it may have been a few years ago, now that their friendship had been rekindled, yet hardly an everyday occurrence. This time Twilight had not a clue what it could be about, and decided that if Moondancer was experiencing some problem, it would not do to delay reading… whatever it might be.

A quick flick of power from her horn opened the envelope atop her desk and she unfolded a plain white sheet of paper upon which a short message was written is small but well-formed letters.

Twilight,

I have a special project I’m working on, it involves both diapers and magical expertise, two things I know you have lots of. I’m sorry to bother you with this, I know you are a busy pony, but though there are ponies who enjoy diapers and ponies who are magical experts, aside from myself, you are the only other pony I know who is both. I don’t want to tell you what I am working on in this letter because my idea is a bit well… odd, and I want to run it by you in private. That, and I’m kind of stuck, I’m not sure how to make progress on my idea and I think you are the only pony who can get me, well, un-stuck. Could you come to my house as soon as you get the chance?

Thanks!

- ‘Dancer

Twilight couldn’t completely prevent herself from groaning.

Diapers. Why did it have to be diapers? Would this fetish consume her life? Sure, she loved diapers and her experiences with them, but she was supposed to be a responsible mare, and here they were intruding into her professional time. And now of course, she was thinking of them again, which began the stirrings of excitement in her body. After all, Rarity was more than likely wondering around her boutique in the same used diaper she had been in this morning knowing her. And Moondancer herself was probably in one too, after all, a mare who rarely left her house was not often required to not be in a diaper, and Celestia knew what Flutters and Dashi had gotten up to after Twilight had left this morning. Perhaps Applejack was- no! She would not think on it!

Twilight pushed the opened letter under the nearest stack of papers and vowed she would not so much as think on it until she had taken care of everything of legitimate importance on her desk even if it took until after sunset. This thought, of course, prompted one of the master servants to knock on her door, announcing the delivery of a new set of documents and letters.

The sun was indeed setting behind the pointed rooftops and spires of the homes, inns, and shops to the west. Its golden light casting long shadows across Twilight’s office as she yawned and picked herself up off the chair. Fortunately, documents had not truly been the only thing to look forward to that day, a few journeys down to the throne room, to three of the greeting halls, and a walk in the north garden with the mayor of Baltimare had added some spice to her day, and a bit of exercise as a bonus. But despite being extra productive, even by her own standards, Twilight was happy to be done. At least for now.

Well, done with responsibilities that is. Tucking Moondancer’s letter into her saddlebags, incidentally next to her folded up morning diaper, Twilight trotted out of her office and onto the balcony. She was pleased the rain had cleared up by the early afternoon so she would not arrive at Moondancer’s house dripping wet. She supposed she could teleport, but Celestia had long ago told Twilight not to overdo it with that ability, as it was not always as practical as a pony might first think, not to mention potentially quite dangerous if the intended destination was not directly in sight.

A leap, and wings spread wide, sent Twilight soaring down among the lower spires and out over the ornate mansions and luxury hotels tucked up as close to the Castle’s walls as they could get. The closer to the seat of government a pony lived the more expensive it was to reside there. But this circle of great wealth was not Twilight’s intended destination. Moondancer was not the wealthiest of ponies, and would be hard pressed to live near Canterlot Castle even if she wished, but she seemed quite content with a modest older house near a public park on the north side of the city, an area with plenty of open green spaces and not nearly so cramped as the inner districts. Even if the surrounding buildings were often still larger than Moondancer’s home. The neighborhood was quiet and peaceful, well suited to a pony who preferred to go undisturbed for as long as possible. This was probably why Moondancer remained less financially well-to-do when compared with many of the ponies Twilight had spent her fillyhood around in the center of the Capitol. Any position of great authority and responsibility, specifically thoes which Twilight herself had offered Moondancer would inevitably lead to Moondancer being, in her words, “Endlessly bothered by ponies who have no respect for my own peace of mind.” The pony was a brilliant scientist and magician but remained determinably uninterested in much outside of her own research, the thought of holding high government office, which Twilight knew she would be good at, disgusted her.

Twilight spotted the familiar residence from the air, its peaked red tile roof and dark stone chimney still illuminated in the setting sun. Spiraling down, she landed within the low stone wall surrounding the front garden with enough grace to make Rainbow proud and trotted to the door wondering just what it was she was getting herself into this time. The previous summons from this mare had resulted in an incident involving a standing energy matrix which had enlarged a pile of blueberries and raspberries to the size of beach balls whereupon they had promptly dissolved into a fine dry powder coating everything within the house. Cleanup had taken hours, and dissuaded Moondancer from applying the energy construct to a living subject.

The deep violet stained door set in a dark yellow frame and surrounded by white washed plaster walls was something of an odd combination, but at least the exterior had been repaired and cleaned since Twilight had brought the mare out of seclusion a few years back.

As Twilight was near to tapping her hoof on the door it unlocked and swung inwards, with suspiciously perfect timing and apparently of its own accord. Twilight smirked to herself, considering the effect unnecessarily dramatic. Couldn’t the mare just come to the door like a normal pony? Then again, hoping Moondancer would do something simply because most other ponies would do it that way was a good way to waste time.

A voice called to her from somewhere further back in the house.

“Hey there Twilight, come on in, glad you could make it. I’ll be there, just a sec…”

The interior of the structure always seemed to be a little too large with perhaps a few too many rooms to be accounted for by the exterior size of the house. Twilight suspected that if Moondancer had in fact perfected metric expansion or dimensional folding to this degree, she could use it to become the wealthiest pony in Equestria, but again doing so would interrupt her continued research and so would probably never happen. Smiling, Twilight again found herself thankful to know a pony who was so honest about what she wanted out of life and had no care for money and power. Quite the opposite of many Twilight was forced to deal with in her daily existence. Herding angry deceitful cats simply wasn’t in it.

True to her word the mare in question soon came through to the narrow entry hall from further back in the house after Twilight had pushed the door closed and set down her saddlebags, happy to be temporarily rid of the burden.

Moondancer’s characteristic shy smile only ever seemed to be emphasized in Twilight’s eyes by her thick eyebrows and glasses. A combination that for some reason left the young alicorn always feeling more relaxed, as if no pony who looked like Moondancer could possibly cause Twilight any stress. A rare feeling indeed, and odd considering the process of renewing their friendship a few years back had not exactly been the smoothest of affairs to begin with. But, there it was, and Twilight was not about to complain.

“So, I assume you got my letter, I’m glad you got here when you did, I’m not sure I could have waited patiently even one more day for you.” Moondancer said while hugging Twilight and giving her a quick kiss on one cheek.　

“If you were that impatient about it, you could have gone straight to the castle. They know you there and would have let you come right to me, no delays.”

“Ugh, and deal with the guards, and the clerks, and a master servant or three? No thanks, this way, I never had to step out my door!” Moondancer replied.

Again, Twilight was amazed at the lengths this mare would go to if it meant avoiding contact with the rest of ponykind.

“I see.” Was Twilight’s simple reply, delivered with a touch of her long-suffering patience for the quirks of her friends.

At least Moondancer had the sense to look slightly abashed.

“So, you’re doing something that involves diapers then? Something you want my input on?” Twilight said getting to the point. Twilight hoped her somewhat deadpan tone was enough to hide the fact that she was beginning to feel some excitement over whatever it was Moondancer was cooking up this time.

Twilight also used her inquiry as an excuse to openly acknowledge the disposable diaper Moondancer was wearing with a pointed stare, though nothing in Twilight’s look held surprise. She had figured Moondancer would be diapered from the start of their meeting, owing to both the subject of the letter and the fact that Twilight suspected Moondancer rarely spent any great amount of time out of a diaper. The only major exception to this was the library, as that was a place that frowned deeply upon any form of distraction to its patrons, up to and including bad smells.

The same kind of smell, incidentally, that had greeted Twilight upon entering the house.

“Oh yes! I’m sure you’ll find what I have to show you to be very interesting…” Moondancer said in a slightly mysterious manner, turning to the side and nodding her head towards the back of her house.

As she turned, her diaper came more into view for Twilight, first exposing the side, so that Twilight could see it was both thick and well made, there was even decent padding over the hips.

The plastic backed disposable diaper was mostly white but was randomly and liberally speckled with light lavender six pointed stars. Twilight’s eyes narrowed a fraction as she considered that thoes stars seemed suspiciously like the ones comprising her cutie mark, even if the color was a bit off. She had always thought diapers printed with a pony’s cutie mark was a good idea, and somehow, she was not surprised to see Moondancer attempting something similar. Always was one for experimentation, that mare.

Completing her turn and walking off down the hall, Moondancer kept her tail raised, providing Twilight with an un obstructed view of the back of the diaper. The diaper was not as white as it once had been however, the entire back and as much of the crotch as she could see was stained darker than the padding over the mare’s hips. And too dark to be accounted for by pee alone. That diaper was full of a big squishy mess and it was beginning to make Twilight a little envious. Though she steadfastly kept her mouth shut as she followed the pony in front of her to the top of an old wooden stairway leading down near the back of the house. If Moondancer wanted a reaction out of Twilight over her choice of underwear, she was going to have to work harder than that.

Her insistence on remaining silent did little to reduce Twilight’s enjoyment of watching Moondancer’s butt and hips move inside her diaper as they made their way to the bottom of the stairway with old boards creaking under every light hoof fall. Ponies often seemed to think wearing a used thick diaper would result in a humorous waddling walk, but it was Twilight’s experience that this effect only ever occurred the first time a pony wore a diaper as an adult if even then. Anypony with even a modicum of experience with diapers tended to walk quite normally, no matter how full their diapers became. Of course, waddling could be forced by more extreme measures such as wearing multiple diapers at a time. But Twilight had no interest in doing so. Twilight had decided long ago that the cause for this was two-fold. On one hoof, if the pony in diapers was so used to being in them that she was no longer paying attention to it being on her, she tended to revert to a natural walking movements. The other extreme seemed to be that when ponies, herself included, became turned on by wearing and using a thick diaper, she preferred consciously walking normally as that forced the diaper to press and rub even more strongly against her inner thighs, and caused the diaper’s contents to squish around in the most wonderful ways as she walked. In her opinion, The true test of a high quality disposable diaper was that one at a time was enough. If a pony wore a good quality diaper in the first place no regular days’ worth of wetting and messing should be able to make the diaper leak badly enough to warrant a second diaper to be put on over the first.

Twilight enjoyed her musings on diapered pony behavior at just about any time, but even more so when a cute diapered mare stood just in front of her.

Having reached the bottom of the stairs, Moondancer continued her steady pace across a clean floor made of irregularly shaped, but flat slabs of dark grey slate fitted crudely together and with aged, crumbling mortar filling the many gaps where the stones did not mesh well. The floor combined with the rounded river stone walls made the clopping of their hooves sound louder than they had upstairs when surrounded by so much old wood and even older rugs and wall hangings.

Moondancer stopped in front of a low but long wooden table set up against the far wall of the dimly lit room. With a quick flash from her horn two bare lightbulbs on chains glowed to life above them.

Twilight was familiar with the room itself, she had stood in it on several occasions over the last few years, and while she could recognize many of its contents, more than several items were new and what was familiar was now in un-familiar locations. Moondancer did seem to enjoy a seemingly constant process of shuffling things around as if playing a never-ending game of maximizing the usefulness of a room and its contents through careful positioning.

Twilight found herself somehow unsurprised to see a series of disposable diapers laid out on the table, more a workbench she decided after a moment’s consideration.

“So, uh, before I tell you about anything here, would you like to be in one yourself? Moondancer asked.

Twilight had no need to ask what it was she might want to be in.

“Oh, why not, I think I will. I was in one this morning, might as well be in one for the evening too.”

Twilight did her best to not let her excitement show. She had not wanted to come right out and ask to be diapered herself, and didn’t want Moondancer to think of her as nothing but a horny filly waiting on the smallest excuse to jump into a diaper. But now that Moondancer had asked, she could finely be diapered without appearing to lack all self-control.

This was also the reason why Twilight didn't bother to mention the wet diaper tucked into her saddle bag from her morning activities, if she admitted to having that and then went back up the stairs to put it on, it would look like she had planned the whole thing out. No, Twilight wanted her acceptance of the diaper to appear as casual and spontaneous as possible. Within certain circles, Twilight was already known to have a diaper fetish, she saw no reason to add a reputation for being desperate to engage in that fetish. She was, after all, trying to work on her image of being a proper princess, even if a good book made her forget herself all too often.

“Cool!, well then, here you go.” Moondancer said, levitating a still folded but obviously thick disposable diaper over to Twilight from a stack of them in a dusty wooden box near her side of the bench.

Despite the state of the box it came out of, the diaper itself looked pristine, no dust at all, and the plastic outer layer and padding was in perfect condition, no creases, lumps, or tears. The diaper was mostly white except for pink accents around the leg guards and small tail hole, a single wide pink stripe running down the middle of the diaper from the top of the front to the top of the back, and four pink tapes. These tapes Twilight pulled on tightly while pressing them firmly down in place onto the thick plastic of the front of the-, her diaper.

She sighed a little to herself as the warm, thick tightness of the diaper settled around her. Even unused it felt nice and comfortable on her body and it pressed against her crotch and butt in so many wonderful ways. She was a little disappointed that she didn’t have to go potty right there and then, but not even a princess’s timing could be consistently that good.

Her attention returning to the present, Twilight blushed a little as she caught Moondancer’s knowing smile, a smile that told how Moondancer knew exactly what Twilight had just been feeling as she had taped on her new diaper.

“These are nice diapers Moondancer, where’d you get them from?”

“Oh, well, there’s this pony named Rarity who owns a successful clothing company, which has a not so well known division specializing in diapers…” Moondancer trailed off grinning.

“Ah, of course, Rarity does rather dominate in that market segment around here doesn’t she.” Twilight replied.

“Seems like it, you know, her diaper store is not that far from here, we should visit sometime, you and me. I go there every now and again to buy a box or two of various diapers. I like to try out different styles. The one you are wearing is a little on the plain side compared to some of the styles I have seen there, but they are made very well and I think a simple design is often best, besides, it's the mare that makes the diapers look good more than the other way around.”

A short awkward silence followed that statement as Moondancer realized how her words betrayed her thoughts on Twilight’s diapers and the mare herself.

Turning back to the workbench and the diapers laid out on it, Twilight gestured with a hoof to them, attempting to rescue her friend from embarrassment by bringing Moondancer back to the original reason they were both still down in the basement.

“So, about these…?” Twilight began.

“Ah, right!” Yes, well…” Moondancer took a deep breath and adjusted her glasses.

“That diaper in front of you, that was one of 48 I bought as a custom order from Rarity a few weeks ago, I had seen Rarity wear diapers based on herself like that, and thought it would be fun to do the same.”

The disposable diaper laying in front of Twilight that Moondancer was discussing, though still folded up like it had just come out of its package, was obviously quite thick and made with good strong but soft and smooth plastic. The unique thing though, was that its color was a light tan, that perfectly matched Moondancer’s coat color and, if that was not hint enough, the mare’s cutie mark was printed boldly in the center of the diaper. Twilight had noticed this, as soon as she had gotten close enough to see the diaper, but had wanted to wait to hear Moondancer’s explanation when she chose to give it.

“So, I wore thoes, for a while, and enjoyed them quite a lot. Being in a diaper based on my own body was rather, um, exciting.” Moondancer giggled a little at this, but went on.

“But that got me thinking, if wearing a diaper that looked like me was fun, wearing a diaper that looked like another pony, that might be even more fun.”

Taking a deep breath, Moondancer moved over a bit allowing Twilight to stand in front of the second diaper laying on top of the workbench. This one she smiled at even more.

“So, I ah, had these ones made, I hope you like them. I sure do…”

Twilight stared down at another diaper that was made identical to the first but the color was now lavender, and the cutie mark printed boldly on the front was her own. She was even more sure now that the used diaper Moondancer was currently in was based off her cutie mark, if not in quite so direct a way.

Twilight raised an eyebrow, but seeing the nervousness on Moondancer’s face, she softened her expression.

“I’m flattered Moondancer, I really am. I’m glad you like me enough to have had these made.”

Twilight gave Moondancer a quick hug to show she really did mean it, and enjoyed how her diapers felt and sounded as she moved herself. She also got a fresh whiff of the smell coming from inside Moondancer’s diaper and privately enjoyed that as well.

“Anyway, um, wearing diapers based on how my friends look… well, I started to daydream about how it would feel to ah-“

Moondancer paused, and adjusted her glasses again looking at the floor.

“Well, I thought it would be an interesting experiment to-“

She paused again.

“What I’m saying is that instead of just wearing a diaper that looks like me, what if I, well, was that diaper… or at least could feel what that diaper felt, if well, it could feel anything at all!” Moondancer finished in a rush looking more embarrassed by the word.

In the following silence, Twilight blushed but spoke comfortingly.

“Don’t feel strange about it. I think I might have had that fantasy once or twice myself. Probably many ponies in diapers have had such a notion cross their minds at least once.”

“I- thank you, yes, well about that. See, I thought, well, I thought I might actually be able to make my daydream come true, at least to an extent…”

Moondancer said gesturing to the third diaper in the row.

Twilight’s earlier feelings of pleasant amusement and slight arousal were suddenly being replaced with curiosity and a vague sense of unease.

The third diaper in the row was more standard than the previous two, it was in fact the same design at the one Twilight was now wearing, but instead of pink accents, the leg guards and stripe were light green. Another difference was that this diaper was quite soaked.

“When I wore this diaper two days ago, I attempted a standard psychosomatic transference spell, but modified so that only my interpretation of sensation was translated to the diaper without the usual accompanying physical or visual manifestation occurring in the object being projected into.

Leave it to Moondancer to describe a PT spell as ‘standard’ when thoes sorts of things were only performed by Unicorns with a minimum of a decade of magical training behind them. To say nothing of custom, on the fly modifications.

Moondancer continued her story though, and Twilight listened with interest.

“The experience was certainly unique, I could feel myself as the diaper I was wearing, but not completely, it was like a secondary alien sensation overlaid on top of my natural body image. In of itself not surprising, given that this is common for such spells, but as this type of magic is typically used where the object being manifested into is already pony shaped, a doll, or figurine, or as an image of a pony on a page, thanks for that idea by the way, the… discrepancy between the pony’s true body image and the object or image being projected into is usually minor. But projecting to a random object like a diaper that shares no resemblance to the physical form of a pony… well, I had a headache for several hours afterwards and had to lie down for a while to recover. But the other problem is that these sorts of spells do not allow for a pony to operate her own body throughout the casting. It’s generally advised to be laying down when performing a spell like this as the mind can only concentrate on existing within the object being projected into. In this case, it meant that as soon as I was projected into the diaper, I couldn’t do anything anymore, not so much as twitch an ear. Interesting at first, especially, when I uh, wet myself, in an oddly literal sense, as I no longer had any bladder control. But I couldn’t feel my own body very well, and I couldn’t move. Interesting at first, but it got boring quite quickly.”

Twilight, was reminded again that this pony could have become a respectable lecturer at Canterlot University, if she wasn’t so determined to keep to herself as much.

“Well, that certainly is interesting, a little dangerous to try on one’s own perhaps. Though truthfully, I almost wish I had attempted that sort of thing myself.”

Twilight hadn’t done so because she had guessed that the sort of unpleasantness Moondancer had suffered might result from her own attempt, but she said none of this to Moondancer. At least the pony had been persistent enough to have gone and tried it.

“Yes, I agree, but you see, I realized that there was no need to stop the experiment there. I may be limited in what I can do myself, but with a second pony helping me, who knows what we might be able to do!”

Ah, Twilight thought, I think I know why she went out of her way to ask me to come here.

The unabashed enthusiasm on Moondancer’s face seemed a little at odds with her usual attitudes of either being shy or in lecture mode. What it meant to Twilight, was that there would be no easy escape from Moondancer’s plans, whatever they were, and Twilight was not sure she even wanted to escape in the first place. Diapers were involved after all, and that was a big attraction for her, in more than one way.

“I see, Twilight said a little cautiously, I assume you have an idea of what to try next? I hope it’s nothing too dangerous.”

“No no, nothing too weird.” Moondancer paused for an instant and Twilight could almost feel the unspoken “yet” in there, but she kept silent again.

“I want to go up to my bedroom so we both have something to lie down on.”

Twilight raised her eyebrow again, and Moondancer blushed but hurried on.

“I want for us to take turns projecting our consciousness into each other’s diapers but not at the same time. That way I can experience how it feels to be a diaper on you as you wear and um, perhaps use me. Then after a while, you can do the same with my diaper while I wear it. This way we can both experience being a diaper on an active mare, and not on one incapable of moving. Also, hopefully, being a diaper on another pony instead of one on yourself will help to reduce the weird mental feedback issues so the headache will be less. If not, this time I am prepared with a healing potion so we won’t suffer for long.”

Twilight was not sure of this proposal, but Moondancer had obviously tried it with little trouble and frankly, the idea was beginning to turn her on, even if the experience was sure to be rather odd.

“I, well sure, I wouldn’t be much of a scientist if I refused to experiment. Let’s try this out.” Twilight said doing her best to not be nervous.