Author's Notes:

I'm baaacckkk!! Well, I never really left actually.

Anyway, this chapter really put my powers of imagination to the test, and has been one of the more difficult sections of fictional text I have ever written. I also feel that it is probably one of the most unique chapters of any (well written) story on this site, I dare say.

If you can find it within your ability to enjoy my stories at all in the first place, I think you will enjoy this part as well.

Also, if you feel like it, please comment, even if it's about something you don't like, feedback is helpful!

Moondancer grinned in her shy way, and managed to look rather relieved as well.

“You won’t regret it! If we can make this work, we can go on to more advanced stages. There’s no way any other research group will ever be able to match our rate of progress.” Moondancer said, her expression transforming into one of fierce determination.

“…Other research…? Moondancer, are you saying there are other ponies doing this sort of thing? And we’re competing?

Moondancer blushed. “Ah, no, not that I know of…but one can never risk the assumption that there is not!

Twilight sighed.

“Well, let’s not get too ahead of ourselves, we need to make the first experiments work, and then go on from there.” Twilight replied.

“Yes, ok, ok, point taken, but let’s make sure to have fun anyway!” Moondancer said, again smiling a bit too broadly for Twilight’s peace of mind. Something about diapers seemed to insert a little bit of Pinkie Pie into the otherwise steadfastly serious Moondancer. It was at times, frankly unnerving.

“And record all experimental data!” Twilight said loudly to Moondancer’s diapered backside as the mare turned towards the stairs.

“And record all experimental data.” The unicorn replied, not turning around, and already halfway to the stairs.

A small part of Twilight was surprised at herself for being the voice of reason in this situation, as the following activities were sure to involve diapers and much scientific experimentation. Two of her most favorite things. But apparently spending over a decade as an Equestrian regional governor had helped her think a little more logically, even in situations such as this.

Hurrying from where she had been standing, Twilight caught up with the enthusiastic mare ahead of her and they trotted together up the creaky wooden staircase a little more swiftly than they had come down not so long ago.

And yet again, Twilight found for herself a particularly enjoyable view of the fully used diaper on the mare in front and above her on the stairs. The thick plastic backed disposable with its suspicious star prints squished and bulged in all kinds of pleasant ways as it was pressed and squeezed between Moondancer’s inner thighs as she trotted up the stairs. This movement also made the strong odor of the squishy poop covering Moondancer’s backside considerably more noticeable. Twilight couldn’t bring herself to dislike the smell, in fact, she thought, it might be making her a bit wet. The discoloration of the otherwise white plastic below her tail and between her legs only served to enhance the experience and made Twilight all the more aware of her own thick disposable diaper, tightly taped so as to hug her butt and hips. Even dry as she was, Twilight could not help being aroused by her own diaper, so thick between her legs, while she watched the diapered backside ahead of her.

As they wound their way up through the house to Moondancer’s bedroom, Twilight made a few attempts at small talk, hoping to glean some more details out of the reclusive pony regarding the current state of her social life, assuming such currently existed, or other avenues of research she had been pursuing.Unfortunately, Twilight was already aware of what little information Moondancer did share. She wasn’t surprised that the pony seemed uninterested in relating her social interactions, she never really had been, though usually Twilight could get Moondancer’s mouth running by bringing up current experimental theories. But it seemed that for the moment at least, Moondancer had only diapers on her mind, and she was not about to be distracted.

The stairway from the ground floor up to the clutch of rooms nestled under the steeply slanting roof, was, oddly, a spiral, and even more narrow than the one leading to the basement. It also creaked constantly as the weight of pony hooves pressed down. At least the stairway and every other surface had been clean, nopony liked to sneeze all the time from dust after all. Though there had been a few large spider webs in corners. All of them inhabited.

Coming around the last bend and emerging onto the landing, Twilight followed the diapered pony to the right and through an open door to a narrow yet long room, which was nearly filled at the far end by a bed and bookcase. This was apparently doing double duty as a nightstand. All the furniture in the room, and in most of the rest of the house for that matter, looked antique. As though every last bit of it had been inherited from some elderly relative, with no newer pieces to balance out the aged feel.Twilight felt that she was in some old county lodge, instead of on the outskirts of the capitol city itself. But, Twilight had to admit, there was a cozy charm about the room nonetheless.

The image was spoilt just a bit by the tidy collection of scientific instrumentation crowded together on the top shelf of the bookcase by the bed. Equipment for monitoring magical energy form and output, and brain activity scanners as well, Twilight was sure, as she recognized some of the devices.

Twilight realized that Moondancer had been silently staring at the bed without moving towards it for a few seconds. Before Twilight had the time to ask why, Moondancer whipped around and headed for a door near the other end of the bedroom, disappearing through it without a word.

“Just a sec!” Moondancer called from inside the room, her personal study, Twilight knew.

A moment later, the pony emerged with what appeared to be a dark blue rubber sheet being carried along in her magical field, which glowed with a shade of violet lighter than Twilight’s own.

“Sorry, forgot to put this down earlier…” Said Moondancer as she hurried back across the room in front of Twilight to spread the protective layer out over her bed.

Twilight stood there in the doorway feeling a tad awkward as she watched her friend fuss around with the equipment and organize various piles of books and papers so as to make more extra space should the need arise. Finely the mare seemed satisfied with her efforts and beckoned Twilight over to the bed.

“Ok, so how about you lie down here next to me here…” Moondancer said, patting the bed next to her while she turned on some of the devices sitting next to her. They lit up with small flashing lights and the screen on the neural-electrical activity monitor began to display complex sine-wave patterns.

Twilight hopped up onto the bed, enjoying the way the smooth rubber sheet felt on her hooves as she carefully walked across it and then sat down next to Moondancer, who also sat down a second later. The blissful look on her face told Twilight that her friend had just been reminded of the full state of her diaper as her weight had pressed down in it.

“Enjoying yourself?” Twilight asked with a fake innocent smile, as Moondancer began sliding her butt backward and forward, and action which produced a faint squishing sound.

“Ah, yah, just a little. She replied not even looking embarrassed at all.

“Well anyway, might as well get started, now that I have you here and all. Just lie back on the pillows next to me. I think the best thing to do is for me to try to project my mind into your diaper first, since I have at least a little experience with this process, and if it works the way I want it to, I’ll… wake up, is the best way to describe it, and then you can try doing the same with my diaper. How does that sound?”

“Um, sure, whatever you think is best. How will I know if it’s working or not? Will I feel anything?” Twilight asked.

“I’m… not sure, these sorts of spells are typically pretty unobtrusive, but if we get into actual diaper transformation… who knows. Well, never mind that, let’s just concentrate on the immediate project.

Twilight had a single eyebrow raised at this, but forced it down, deciding this was not the time to continue that discussion.

“Oh uh, by the way Twilight, you wouldn’t by chance have to use your diaper, would you?” Moondancer asked, as though this was a random aside.

“I do have to pee, I’ve been holding it for a little bit. Figured it might be useful to have to go.”

“Oh wonderful! Um, so, if I’m still unconscious after about five minutes, would you please wet your diaper? That way I’m sure to feel it.

Twilight hesitated for a second, recognizing how absurd that statement would be without context, but then smiled and nodded her agreement.

“Ok, good. Well, here goes I guess.” Moondancer said closing her eyes and laying her head back onto the old, but fluffy pillows. The soft rustling of her full diaper sounded even better when combined with the other sounds it made when pressing against the rubber sheet under her.

Moondancer lay straight out, face towards the ceiling, and screwed up in concentration. Within a few seconds the air around her horn began to glow a pale violet color and her breathing slowed, becoming deeper as though she were simply asleep for the night. At first Twilight couldn’t help but enjoy the sight of her friend’s cute body, and the thick disposable diaper taped tightly about her waist. The pee saturated absorbent gel under the glossy plastic outer layer of the diaper stained the front a light creamy yellow color which transitioned to a definite brown around the leg holes. Twilight smiled at seeing this, as she knew full well how good that must feel to wear.

Suddenly however, Twilight reminded herself exactly what it was that Moondancer was attempting to do, and so she tore her eyes away from the diapered pony next to her, and laid down in an identical position, eyes closed so she could concentrate on every sensation coming from her own thick, but still quite clean diaper. So far, everything felt normal, or at least normal for a pony used to being diapered. The diaper was taped tight and thick, and very well made so that the gel filling it was packed in tightly giving the diaper an assuringly dense feel to it. And of course, like any other thick item of clothing, like a hoodie or good sweater, her diaper naturally did a fine job as an insulator, keeping everything under it nice and warm at all times, regardless of having been used or not. All this ran through Twilight’s mind as she recorded every sensation she could, trying to detect any change in the diaper, no matter how small. She was afraid of using her own horn to detect magical changes due to the possibility of disrupting Moondancer’s work, and so was limited to just how her body felt.

Coming to enjoy these sensations Twilight pressed a hoof into the front of her diaper to enjoy the pressure, and froze. Was the front of the diaper warm? Too warm? It’s outer plastic felt exactly as if she had just wet it, but she had done nothing of the sort. Not yet anyway. She made sure to check, no, she was still quite dry, and yet the outside of the diaper was quite warm. Quickly she moved her hooves to her hips, then to the top of the diaper over her waist. Both of thoes places were warm as well. Too warm, to be accounted for by simple body heat. The smooth plastic should be slightly cool to the touch, that had always been her experience at least. But now, well, something strange was happening, she turned her head to look over at Moondancer. The mare’s face was no longer a mask of concentration but was nearly expressionless, with perhaps the hint of a smile. In other words, basically what Twilight would expect to see if the pony was just in regular sleep.

After a few more seconds of watching Moondancer carefully for any indication of… anything, Twilight turned to face the ceiling again, but noticed nothing about it. Her heart was beginning to beat faster, was Moondancer’s mind, at this very moment, being extended, or projected, or whatever, into the physical matter of her diaper? What in Equestria was Moondancer feeling at this very moment then? If she was, if she had succeeded, then perhaps now was the time to relieve herself into her diaper? Twilight considered this, and decided that she had given Moondancer her requested amount of time, or near enough. And besides, Twilight needed to go rather badly by now anyway.

Twilight tried to relax herself so she could begin to pee, but found to her surprise, that her body was hesitant despite the pressure in her bladder. It seemed to be wanting extra reassurance that it really was ok to release its hold under the present, rather unique circumstances. Twilight tried to relax the other parts of her body, her legs, her neck and back, in an attempt to settle herself down enough so she could wet her diaper as desired. It was a frustrating 30 seconds or so before the first warm trickles leaked out from beneath her clit. These first had no real effect on the state or overall feeling of her diaper, but, seeming to convince itself that all was indeed well, her bladder opened up and wonderfully warm urine began to poor out of her and into the waiting diaper.

Twilight was pleased with the amount she wet her diaper as the last drops were absorbed into its now even thicker, swollen front and crotch. Even so, she only had so much capacity inside herself and the diaper was very absorbent, so while her front and crotch felt wonderfully hot and damp from the diaper, her butt was still mostly dry. It would take another full wetting or two before her diaper was completely soaked.

Again, Twilight ran her hooves all over every part of the smooth plastic of her disposable diaper in an attempt to see if she could discern if the diaper felt any different than she would expect it to at this point. Having wet so much, it was harder to tell if the warmth at the diaper’s surface was simply from being full of all her pee, or if something rather more unnatural was causing it to be so. But either way, she knew that what she had felt before her wetting had not been a trick of her imagination. She turned again to look over at her friend lying next to her and noticed that Moondancer’s breathing had become shallower, and came more often. Perhaps this process had much the same effect on a pony’s body as a very vivid dream? Twilight was very curious to know.

Twilight wasn’t exactly sure what to do next. Moondancer hadn’t simply woken up, or perhaps returned to her own body, would be a better way to think about it, as soon as Twilight had finished wetting. And Moondancer hadn’t told Twilight what to do after she had wet her diaper. Not wanting to force Moondancer to do anything, Twilight decided that if she got off the bed without too much fuss, she could simply walk around a bit. After all, if Moondancer was really experiencing being her diaper right this moment, having Twilight walk around in her diaper, in Moondancer, she supposed, would, should, be a pleasurable thing for the mare still lying unconscious on the bed to experience.

Rolling over, and climbing out at the end of the bed as gently as Twilight could manage, she stood up on all fours. With a small bit of power from her horn, she gently tugged at the top of the waist of her diaper to pull the diaper straight and bring the warm wet gel inside back into contact with her damp pussy lips. Enjoying being back in a wet diaper again for the first time since early in the morning, Twilight trotted about the bedroom, poking her muzzle into various stacks of dusty books, and cabinets full of odd items. Some she recognized, like the miniature carved stone figure of an ancient Unicornia princess with most of the horn broken off. Judging from the worn carving of the headdress, the figure dated to the middle kingdoms period, at least 4,600 years ago. It was something to see a piece like this outside of a museum, but Twilight supposed Moondancer was a better pony for taking care of such things than most. Quite a number of old spell books she recognized too, but other things like a collection of jars full of oddly shaped bones, she could not place.

Despite the temptation, Twilight never let her curiosity with Moondancer’s eclectic collection of items fully distract her from the warm weight of the thick disposable diaper fitted tightly around herself. She enjoyed simply walking around the room and back and forth for a while, feeling the thick soaked padding being squeezed between her inner thighs. She even left the room just to walk down the narrow, twisty stairway and back up it again, enjoying the diapered sensations all the more. Her only regret, was that she didn’t have to poop her diaper as well. But she consoled herself with the thought that there would be plenty of opportunity for that in the future.

Just as Twilight was wondering what to do with herself next, perhaps rub her diaper some more? Moondancer seemed to return with a faint moan and a fluttering of eyelids. Twilight hurried over and hopped up onto the bed, where she bent down over Moondancer, watching her carefully. With another groan, Moondancer opened her eyes fully and raised a hoof to her head.

“Ugh… the lights are so bright… Wow, that was…different, but sweet Celestia, I think I’ve really discovered something here. I think that went really well. I feel slightly nauseous, but rather better than after the last time, and, and…

“And you… you peed in your… in…me? Yah, I know you did, I felt it, I felt… and your diaper is soaked…”

“…Just wow.”

She plopped her head back down on the pillow and put a foreleg over her eyes.

“Until you do this for yourself Twilight, you will have no idea how…fucking weird it is. But after you get over the initial panic… its quite, um, exciting…”

As she said the word “exciting” Moondancer trailed the hoof not covering her eyes down to her diaper and pressed it down in the center of its budging crotch and moaned.

Twilight watched in interest as her friend rubbed her hoof up and down over the front of her diaper, which made interesting little squishing sounds as pressure was applied in various places.

But, to Twilight’s slight surprise, Moondancer stopped after less than a minute of this activity and moved her leg away from her eyes.

“I think now is not the best time for that, we can wait until after you have done the same thing.”

“You do want to try it, now don’t you?” Moondancer asked Twilight, a hint of uncertainty in her voice.

Twilight hesitated, but only for a second.

“Yah, I do, I really mean it, I want to!”

“You really won’t regret it, I promise! …unless I do it wrong that is.” Moondancer added as an apparent afterthought.

Feeling slightly less sure, Twilight allowed Moondancer to press her back down onto the bed so that she lay in the same spot Moondancer had occupied previously. Then Moondancer herself lay where Twilight had been.

“Ok, I’m going to guide your magic field, Twilight. I know it will make you feel like you are in your first year with Celestia again, but bear with me, its’ going to be a bit of an odd ride, and I think I’m probably the only pony on Equestria right now with any experience in this.

“Don’t worry about it, Moondancer.” Twilight said smiling at her diapered friend.

“I’m not so stuck up that I won’t accept a little guidance from someone who knows more than I do.”

“I’m not sure anypony knows more than you Twilight, well, accept Celestia and Luna perhaps.”

“I think you’d be surprised Moondancer, it’s amazing the things ponies can become expert in.” Twilight replied with affection in her voice.

“Like diapered magic?” Moondancer asked with a grin.

“Haha, yes, like diapered magic.”

“Well, here’s hoping for more good luck in our research. And, Twilight, if this works, I’m going to let you experience being my diaper for longer than I was yours. I think it’s better, easier, on our brains, if we spend fewer, but longer periods experiencing each other’s diapers. It takes a little while to become, uh, acclimated to the situation, and the longer you stay that way, the more you are able to process the new input stimulus set. At least, that’s been my experience.”

“Ok, good to know, I promise to do my best!”

Moondancer snorted.

“You always were a good student. Anyway, let’s get on with it. Close your eyes, Twilight, if you please.”

Twilight did so, and tried her best to relax, a process made easier by her warm wet diaper holding her butt and crotch comfortingly.

Barely two seconds later, she felt a directed flow of power from Moondancer’s horn touch her own and twine up along its length. The presence of the magical flow so near made her own horn come to life without any conscious thought. Horns tended to be sensitive in that way. Twilight didn’t stop the flow of power out of her own horn, but instead increased it, giving Moondancer more energy to manipulate.

The following period of time, how long exactly, Twilight didn’t know, was probably the strangest in her life.

At first Moondancer’s magic flow continued to wind up and curl around Twilight’s horn like thick vines about the trunk of an ancient tree. Then Twilight could feel the flows within her Horn’s energy field begin to branch and re-branch. They bifurcated again and again, becoming smaller with each division. Suddenly Twilight felt Moondancer’s magic take hold of her own horn’s power matrix so completely and precisely, it was as though Spike had reached out with his clawed hand and gripped her horn physically.

Twilight was sure this was the part where Moondancer now had complete control over Twilight’s power, and could, theoretically make her do anything. There was a great deal of illegal magic which could be performed with these sorts of controlling spells as a starting point, but Moondancer was not that sort of pony.

There followed a series of expanding folds in the power matrix, or what might be more accurately described as multiplications, where Twilight was not sure which energy flow belonged to what pony, and that seemed to multiply the insanely complex weave of energy strands so that the magical web expanded in physical volume from the space just above the surface of Twilight’s own horn backwards into her skull. The magical formation was now so complex that Twilight could no more describe its structure than she could describe the exact arrangement of every snowflake covering a farmer’s field in winter. This framework of power, that glittered in Twilight’s mind’s eye like a cloud of the finest titanium fiber, seemed to settle into her brain, and Twilight understood then, that Moondancer had crafted a weave that was designed to detect and align itself perfectly to every single neuron and synapse of her brain. Generally considered a very advanced and risky thing to attempt due to the fact that the only practical way of doing so was to have conscious control over the behavior of only the first few dozen magical energy strands, and hope that the automatic duplication and arrangement functions were performed flawlessly across the hundreds of trillions of such energy strands required.

For a second, all seemed still. The energy patterns seemed to dissolve away like cotton candy in water as they merged with every cell in Twilight’s brain.

Then, Twilight felt her mind pulled upwards out of her own head so fast, she had no chance to recognize what was happening until the procedure was complete. She felt like she had been viciously compressed, like she had been stuffed backwards through an iron tube, and forced out the other end like so much sausage. Panic washed over her and for a moment she wondered wildly if she had just died. Was this the sort of out-of-body experience some ponies spoke of, having narrowly escaped death themselves?

But no. She could still feel her body, albeit dimly, distantly, as though across a great chasm of empty echoing space. None of her senses were really working either, everything she could see, feel, hear, taste, or smell came across that same tenuous connection. Though somehow, she knew, without really knowing how, that she, that is her mind, had really not gone that far. Probably she was floating only a foot or two from her own body, likely between herself and Moondancer.

But before she had any more time to come to grips with this inordinately odd predicament, she felt herself move again, and not just move, but even more oddly, deform.

Somehow, and she felt this was an experience worth conducting research on simply by itself, her mind was used to being in the same shape as her physical brain. That was, after all, the only place it had ever truly resided until now. And she, her thoughts, were so accustomed to being in the shape of a rough sphere, that she was strangely aware of that shape changing.

In a moment of insane humor, she thought of one or two topologists she knew who worked in The Canterlot University Division of Advanced Mathematics who would be fascinated with this process.

Her mind seemed to stretch and inflate outward with several indentations beginning to form. These turned into large concavities which then connected, forming tunnels through her mental image of herself.And suddenly she knew exactly what was happening, the shape of her mind itself was being contorted to assume the same physical shape as Moondancer’s diaper. Twilight felt the urge to giggle, to laugh, half with mirth, and half with hysteria. What were the two of them doing? Performing tremendously complex magic, several levels beyond what even Twilight considered advanced, all for the sake of finding a new option by which to push the boundaries on ways of engaging in a diaper fetish?

Twilight wasn’t sure what Celestia would think if she knew what her precious student was getting up to at this moment.

But Twilight had no choice in the matter, she was simply a passenger on this incomprehensible ride.

Twilight realized with a disembodied start that her transformation had ended and that her senses were coming back, but very strangely.

She still seemed to be connected tenuously to her real body, but it felt even more distant if that were possible. She was becoming aware of new feelings, much more present and immediate feelings. She saw, but weirdly, distortedly, as though she was peering through a large soap bubble, or more than one, and everything was monochrome, without any color apparent anywhere. She tried to close her eyes, but could not, as she had no eyes to close. In desperation, she fixed her thoughts onto a single spot, and tried to ignore everything else. It was not an easy thing to do, not at all. It was as though she had no specific eyes, but was seeing everything around her as though every part of the exterior surface of Moondancer’s diaper was an eye. Twilight wasn’t sure how that worked, but decided that there was some way in which she was being made aware of any ambient light shining on the surface of the diaper. Large sections of her highly distorted visual field were black, and Twilight realized these areas were the rear of the diaper, which was pressed into the bed since Moondancer was laying on her back.

No wonder Moondancer had received a splitting headache the first time she had tried this, it was a wonder the mare hadn’t gone insane. There was nothing in pony psychology that was designed to handle these sorts of sensory inputs. Twilight began to suspect that the only reason she wasn’t losing her mind completely was that Moondancer had designed some sort of awareness buffer into her manipulation of Twilight’s stimulus processing centers. All she could think was that she was thankful for the foresight.

By carefully concentrating on specific areas of what she could see, Twilight was able to tune out the rest of what was visible as though she had wildly extended peripheral vision. She concentrated in one direction and made out the far wall of the bedroom and the several bookcases shoved side by side located there. Concentrating in another direction showed her the ceiling, another showed the inside of Moondancer’s left leg, it seemed only an inch from her face, which, Twilight considered, in a way it was. And in another direction, she could see, disconcertingly, her own limp body, laying as though in deep sleep, yet Twilight had rarely felt more awake in her life. But that brought home the oddness of her vision again, how could she at once see the inside of Moondancer’s leg and her own body which was on the other side of said leg without looking around or through the leg. It was like partially existing in the 4^th dimension, where all the 3 dimensional angles and sides no longer connected properly, and too much seemed to happen in not enough space. Not unlike the rooms of this house, Twilight noted. What kept her from losing it though, was realizing that logically, if she was seeing from every outer surface of the diaper simultaneously, then when she was looking at Moondancer’s leg, she was seeing from the front or crotch of her diaper, but when she gazed on her own body, she was looking from the side of the diaper that wrapped around Moondancer’s thigh which was on the outside of the same leg.

Twilight tried very hard to keep in mind the physical form of the diaper so that she could logically explain to her own satisfaction every oddity about what she was seeing.

It took some time, but between that process and getting better at concentrating on specific points of her extended visual field, she was able to turn her attention to the other sensations which had been slower in becoming available to her much over stimulated mind.

Twilight later decided that it was probably the unusual feeling of warmth that provided the next big shock. The best way she could describe it, the only way really, that made any sense at least, was that it was not too dissimilar to the feeling of drinking a large quantity of hot wine plus lots of hot food very fast, but without the stomach discomfort. In other words, she felt rather warmer on the inside than on the outside. Twilight would have thought it was simply Moondancer’s body heat, but then she suddenly became very, very aware of the fact that Moondancer had wet and filled her diaper quite thoroughly some time ago, and that meant, in an unnervingly real way now, that Twilight herself was full of Moondancer’s pee and poop.

As it happened, that warmth was just the first bit of feeling to return to her mind, and she soon felt a strong sensation of having her inside part, which was now a real concept, coated with a thick layer of something at once wet, slimy, slippery, and gooey. And beneath that, which was to say inside herself, was that sensation of being full of warm wetness. At first these sensations were so strange and unique that Twilight had no sense of sexual excitement at them, simply bewilderment. And to make it all the stranger, Twilight also became aware of the weight of Moondancer’s body pressing down on half of her own adopted diaper body, she supposed that this ‘half’ was in fact the rear of the diaper and that when Moondancer stood up, this feeling would go away.What she knew wouldn’t go away, was an interesting, not unpleasant feeling of tightness, all about herself, as though she was giving another pony a really big hug. She realized that this sensation was a direct result of being taped around Moondancer quite tightly, and as such was something to be enjoyed.

This thought, that she could enjoy a feeling in this state, made her able to concentrate more fully on the experience, and as she did so, she began to realize how quite nice it was to be able to feel, truly feel all over herself, Moondancer’s soft round butt, her warm crotch, and the press on either side of her diaper body of Moondancer’s inner thighs. This then made Twilight all the more aware of being full of so much pee and soft warm poop, which now that Twilight considered the matter, explained why she could not distinguish the feeling of Moondancer’s pussy or anus very well, as this was due to the thick layer of poop coating both areas.Twilight was beginning to appreciate just how good this diaper must have felt for Moondancer this whole time, yet the pony had not let on much about it.

Twilight was beginning to calm down enough from the initial manic fever of experiencing a mountain of unnatural sensations, to appreciate not just the fascinating feeling of discovery this presented, but also its limitations. She could not, for instance, truly block out portions of her nearly all-around vision, she couldn’t control a single physical thing, as her mind was disconnected from her body, a disquieting thought to be sure, and related to this, she realized, there was no way for her to experience true sexual pleasure for the same reason. It was as simple as always to think of something as sexy, but these thoughts were somehow muted by their disconnect from any physical reaction in her body to such thoughts.

However, Twilight decided that all these issues and more could be discussed later, after she had returned to herself, and not to dwell on any niggling downsides while being provided with such a stunning opportunity for investigation and discovery.

Twilight had barely come to this conclusion when a new, and yet again, momentarily shocking sensation entered into her diaper body. At first all Twilight could do was identify a new source of warmth, but she quickly realized it was pee. A strong hot stream of it was issuing from somewhere under, or within, what Twilight could best describe as being her middle. She even felt the pressure of the flow as it splattered against her own thick padding and quickly soaked inwards, spreading outwards and adding to the already warm, soggy, and heavy feeling she was full of. She also realized much of this new wetness was draining downwards and toward the part of herself she couldn’t see from, or the back of Moondancer’s diaper in a more normal context.

Twilight had been peed in before, sex with Rarity who now always possessed a penis, and Cadance who did on occasion, often involved this particularly naughty act after first coating her insides with cum. But being filled with pee as a diaper itself, was on an entirely different level. Twilight couldn’t call it a better feeling per se, as she had no body which could react sexually, but the sensation of being wet as a diaper was so much more… all-encompassing. Like she was a container that had just had lots of warm liquid poured into it. Not really so far from the truth come to that, Twilight thought.

No sooner had the flow of pee died away, when Twilight saw, from what seemed many angles simultaneously, a hoof descend towards her center, and press firmly into her diaper form just above where Moondancer’s tail stuck out through a hole in the part of her she currently could see well from. And not so incidentally, the same place from which the pee had just been issuing. The pressure of the hoof was strong, but again not unpleasant, and as it glided up and down Twilight’s smooth plastic surface, and pressed in further, Twilight could feel the slimy urine saturated poop coating her insides and provide lubrication to Moondancer’s pussy lips. Twilight felt herself slide against them whenever the hoof came near, which it did with increasing frequency. Not only did the hoof speed up, but Twilight realized that Moondancer was now also arching her back and pressing her crotch upwards into Twilight’s poopy insides.

Twilight’s next experience was to have a pony cum inside of her in a way she had never really imagined before, which was saying something as she had imagined quite a lot over the years since Cadance had begun to “babysit” her as a filly.The warm fluid erupted out of Moondancer in a way noticeably different from the urine of just minutes before. More of a sharp spray, than a steady stream, and even as a diaper, Twilight could tell a difference in the texture of the fluid. It was stickier, though less so than true stallion cum, and It didn’t mix with the runny poop filling Twilight as easily as had her pee. The whole experience was certainly quite simulating, or as stimulating as possible to a physical form with no sex organs, but to Twilight, perhaps the best part was how enlightening the whole process was. In a way, it brought her much closer to understanding exactly how Moondancer felt as she pleasured herself, since Twilight, and what she contained, was now the primary object making such pleasure possible.

Twilight considered that there was a surprising amount of otherwise hard to acquire knowledge to be gained while existing, at least in mind, as a diaper, that would help immensely in learning just what specific mares, or stallions, precisely wanted to feel when they wore their diapers.

A sudden apparent jolt of movement and rotation struck Twilight’s already stressed senses. At first it was hard for her to understand what was going on, as she no longer possessed a stable notion of direction, but she came to realize that Moondancer must be getting up off the bed and thus, Twilight, as her diaper was being carried with her movements. The disorientation lessened somewhat and Twilight was able to concentrate enough downwards to watch as the floor appeared to move along beneath her, and a rhythmic squishing feeling came from both sides of her, further confirmation that Moondancer was now walking across the bedroom. Twilight decided that she was not a fan of having to spend whole seconds trying to understand such basic concepts as getting out of bed and walking forwards. If she was going to make this work, she was going to have to make an effort to think like a diaper and not as a pony, otherwise her state of persistent confusion would be rather more difficult to overcome.

With this in mind, she concentrated on watching and feeling Moondancer descend the stairs, pass by the entry way of the house, turn a corner to go down a hall, then enter the kitchen. Twilight was proud of herself when she was able to examine her surroundings with enough of her normal presence of mind to realize that night had fallen outside, judging from the inky blackness on the other side of the windows above the wash basin.

It appeared that now Moondancer had experienced some measure of release into her diapers, into Twilight, that she was able to concentrate on more mundane activities such as dish washing. This didn’t take much time as, from what Twilight was able to tell from her position below the level of the counter top, Moondancer liked to wash about a dozen dishes at once. Moving on from there, Moondancer relocated herself to a sitting room and unceremoniously plopped herself down in an old, wide, overstuffed chair and began to look through a few stacks of old books, apparently sorting through them. Twilight figured that Moondancer was attempting to simply do the same sort of things she normally would have done had Twilight not been involved at all. Twilight understood this reasoning and agreed with it, how best to understand the ‘life of a diaper’ so to speak, than to experience what it did for the majority of the time while being used. Certainly not ever moment was going to be taken up with sexual activities.

Twilight decided then, that if Moondancer was going to take things slow and steady, then she, herself, would take full advantage of the gesture and use the provided time to relax her mind as best as she was able, and simply learn what it was like to be a full diaper, not just act like one.

In an odd way, she began to feel proud of her form, how perfectly designed she now was to hold in so much warm and squishy poop and urine soaked gel against the body of the mare wearing her. She decided that being so wet and messy, and taped so tightly around Moondancer’s soft slender waist, was every bit as enjoyable from the diaper’s point of view as the wearer’s. If not rather more so.

But at the same time Twilight began to feel frustrated. She loved feeling how damp and slimy her insides were, and how good it felt to have the weight of a mare sitting inside of her, but there was, in her current state, no way of reciprocating any of these sensations, no way of really giving back. Oh, of course Moondancer felt good in her used diaper, it didn't take an alicorn to know that, but Twilight felt that having a living pony’s mind inhabiting the diaper being worn ought to provide something special, something above and beyond the standard pleasure of a well-used diaper.

But it was hard for her to concentrate on any specific answers to this problem. Trying to think on and devise plans and hypothesis in her current state was still rather like trying to study for a test while somepony repeatedly beat her over the head with a cheese grater.

In short, distracting.

It was far less insistent now, but there was still the tiny voice in the back of her mind that was screaming that something was terribly, terribly wrong with her.

Growling silently in frustration, Twilight decided that the only real thing to do was shut up and enjoy herself and this unique situation, until Moondancer went back upstairs and released her.

This seemed to Twilight to take some time, though she was not altogether ungrateful for the delay in action on Moondancer’s part due to the continual pleasurable sensations. And anyway, Moondancer had warned her at the outset that she was planning on giving Twilight plenty of time in which to fully experience the results of their experimentation.

Eventually though, Twilight again felt the uniquely disorienting sensation of movement while being able to see in nearly all directions at once. However, this time she was much better prepared to understand what was happening and realized immediately that Moondancer was getting up off the chair. Twilight again was able to enjoy the now almost fun sensation of being a diaper on a mare who was climbing the stairs as Moondancer returned herself to the bedroom.After several rather dizzying movements she settled back down next to Twilight’s all but motionless form with a soft plop. Twilight could now see the beginnings of a glowing aura form around Moondancer’s horn and knew her first foray outside of her body was near to ending.

Twilight began to feel something of a lifting sensation, as though strong arms were scooping her out of a warm bed, it was a forceful feeling, but nothing like as abrupt as when her mind had first been yanked out of her skull earlier. And much to her relief, the crazy vision of seeing from all external surfaces of the diaper at once vanished, and blackness surrounded her as though she simply had her eyes closed tightly shut. Her mind was also undergoing the reverse transformation back into the same volumetric state as her physical brain, and she again became aware of the presence of her true body’s sensations as though they were the light from a distant star in the sky. And now she felt a giddy sensation of rushing towards that light at incredible speed, whereupon she felt for an instant as though she was going to collide with that lump of sensation, but instead found herself settling into it, becoming one with it…

…and her eyes blinked open.

And she shut them again quickly, groaning.

Everything was so damn bright! And loud too, why had Moondancer not mentioned the noise! Her breathing, her heart pumping, the rustling of her own diaper as she shifted on the bed, it was such a cacophony! It seemed similar to what others had described to her as some of the effects of a bad hangover, though Twilight had never been stupid enough to drink enough to experience that for herself. She had never simply felt this much. Like every one of her senses had been pushed beyond their safety limits.

But even as she wondered how much longer she could stand this before she detonated like so many fireworks, she realized that everything was slowly returning back to normal. Nothing was tuned to quite the same excruciating level as it had been the second she had regained her own body. She decided that all she could really do was wait it out in the same way as one had no choice but to suffer in tingling, spiky, silence for a while after a limb had fallen asleep. Unfortunately, though, the lessening of her hyper-active senses was being replaced with an aching and throbbing in the back of her head.

Twilight, groaned and rolled over onto her side, trying again to open her eyes to the still unnaturally brilliant room.

“Ooohhhh… Celestia’s tits! That’s… too much…”

“Twilight winced as Moondancer barked a laugh right next to her.

“Celestia’s… tits? Never thought I’d hear that one from you.”

“So… how was it”

Twilight lay quietly for a while trying not to move any part of herself.

“…Twilight?”

“I feel… I feel like somepony just hit me in the back of my head with an iron skillet is how I feel.” Twilight finally responded, knowing she had to say something to address the worried tone in Moondancer’s voice.

“How can you stand the transition?” She asked after another moment.

‘Well, I admit it’s no fun, but it wasn’t so bad for me this last time. But you sound like you feel similar to how I felt the very first time I tried this on myself. I think most of the trouble is with the visual cortex, its located in the back of the brain after all which explains the source of the pain, and that all-around vision can’t be easy on it to try and process… I guess we really ought to work on doing something to make that more manageable. Perhaps we were a little too hasty, and should have waited until we could solve more of the difficulties… I’m sorry Twilight, I-.”

“No…no, it’s fine, all fine.” Twilight said weakly, waving a hoof limply in Moondancer’s general direction.

“I signed up for this myself, remember? And anyway, science is not always easy on either the mind or the body. I think know that I understand exactly what that feels like, as you do to, that we can both make some real progress in making our next attempt much more, ah, accommodating to our senses. And beyond that, I think… well, I think as you probably also do too now, that if we can make this process work, there should be a way to succeed with a true physical transformation into a diaper. But there is no way I’m going to risk that until we can transfer our minds into our diapers with no ill effects at all, and that, I think, is going to take quite a bit of trial and error.”

Moondancer looked a little surprised at Twilight’s apparent strong commitment to what had at first been her own rather off-the-wall project. Twilight saw this expression and smiled.

“Do you really think, Moondancer, that you could demonstrate an idea to me of this nature and not expect me to understand the magnitude of the fun we could have if this process is perfected? Honestly, it’s me, Twilight. I don’t see why you are all surprised.”

Moondancer simply laughed and rolled over onto Twilight, their diapers squishing together warmly, whereupon Moondancer hugged her friend as tightly as she could.

“Oh yes, Twilight, you and I are going to have lots of fun, I think.”