FSE

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"Umm, Princess Luna? We're just about to start the pre-filming specs on the set."

"Oh! O-Of course..." The dark alicorn turned her head with a kind smile, and nodded well enough for the intern to smile back. She waited until he walked away to sigh as silently as she could, and blushed more profusely in nervousness. She had to hang her head for a moment with her eyes shut, just so she could get her bearings straight. But alas, with her horn still brightly lit, she wasn't able to pull away from the clipboard hovering in front of her face.

"Ughhhh..." After letting out a soft whinny, Princess Luna made sure that she was still alone in the green room before glossing through the notes on her clipboard. Her brows furrowed with a tight grimace, which resulted in another pert exhale through her nostrils like an agitated bull. Part of her wished that she stopped that intern to ask some important questions; however, she had a feeling that the lowly crew-member likely wasn't the one to ask about her scheduling. Before she could turn and make her exit, another voice emerged from the doorway that was far too familiar to ignore.

"Ahh, here you are, Little Sister~"

Luna's expression flattened greatly, with a long whinny escaping her muzzle. Despite the great lengths she went through to avoid that certain pony from intervening, it seemed that her dear sister was too clever for a simple distraction. Luna had to take a breath before forcing a fake smile, and turned around to face Celestia without gritting her teeth. "Hmmmm... C-Celestia, you... you were scheduled for a brunch with Fancy Pants and Fleur De Lis, weren't you?"

She tried to give a brief, but firm stare to emphasize that point and its importance. However, Celestia carried a playfully coy smirk while shrugging. "Hmmm... Oh, that's right! I was originally scheduled for that today. Thank you very much for the consideration of setting up that date on my behalf, by the way. It was very thoughtful and kind. However..."

Celestia trotted into the green room with a more confident smirk on her face. "... since it felt unfair to have such a nice date without you present, I talked with them personally to rearrange the brunch for when we're both free. They were very understanding~"

Luna wanted to snap at her sister, but managed to quell her anger well enough to keep a partially-present smile. She still had to let out a long exhale through her teeth before speaking forcibly. "... nnnghhh... y-you... you really shouldn't have done that, dear sister... e-especially just for my sake."

"Well, how could I enjoy myself after learning of your plans, Luna?~" That was when Celestia's smile widened enough to show a more devilish gleam in her eyes. Her sister groaned with her muzzle tightening up immensely. Celestia leaned in to perk her brows knowingly. "After all, it's not everyday that a Princess does a commercial spot."

"Ugh! It is NOT a 'Commerical Spot,' Celestia..." Luna decided to walk past her sister and that stupid grin, and headed for the doorway with her clipboard in her aura. "It is a Public Service Announcement."

"Oh yeah, sure..." Celestia turned her head to shoot Luna a blatant scoff. "And your little 'P.S.A. Special' just happens to be promoting a specific product that you patented yourself, hmm?~"

That made Luna stop in her tracks and hang her head. She sighed deeply, but refrained from looking back at her sister. Instead, she pulled her head back up and said, "For your information, it was not MY patent. I commissioned the company to develop the product fitting my specifications, which were proven to be very successful."

"Oh, I'm not denying that by any means..." Celestia didnt try to stop Luna from exiting the room; however, the Alicorn also couldn't stop Celestia from following her sister and walking alongside her down the hallway. "And if I may add, let me just say that I'm very proud of you for taking such a strong initiative. I took the liberty of reading through Twilight's research notes, and I was quite impressed by how diligently you've been working on this."

Luna almost paused her steps, but her expression softened quite a bit from her sister's sincere words. She even looked back at Celestia with a warm smile, and nodded graciously. "W-Well, thank you for saying that, sister... And you are correct, I am indeed diligent on this particular matter."

Luna decided to float over her clipboard towards Celestia, and used her magic to shuffle around the papers and show a particular article page she wrote. "Just look at this! Can you believe how many of Equestria's youth have problems with bedwetting?! It's absolutely outrageous!"

"Yes, it is indeed upsetting to read on paper..." Celestia's smile dropped long enough for her to furrow her brow while reading through her sister's research. While it may have not been her own personal expertise, it was hard for her not to feel guilty about how high the statistical numbers really were. And with Twilight Sparkle triple-checking the numbers herself with diligence, Celestia didn't need to ask for further verification. "Ugh, my goodness... Forty percent is far too high."

"Agreed." Luna used her magic to flip to the next page, and pointed to a highlighted passage while the sisters continued walking. "And look at THIS! Can you believe how inadequate training pants are at preventing leaks caused by bedwetting?! I can't imagine how many parents had to deal with expensive laundry bills because of improper protection."

Celestia could only nod, not wanting to mock her sister's hard work when it served a genuine purpose. Even though there were certain aspects to find amusement from, she couldn't doubt the significance of Luna's research. "Hmmm... So, that's why you asked for them to develop these diapers?"

"Well, of course! I can't let this continue if the current training pants aren't up to ponies' standards! And if I have any chance in solving ponies' problems in their dreams, I have to make sure they have a chance of not constantly waking up to soggy sheets."

Unfortunately for Luna, she made that remark right as the two rounded a corner, and face-to-face with the ponies directing this show. Luna stopped dead in her tracks, with her face practically exploding into a heavy blush. "O-OH! Ummm... Heh heh heh... G-Greetings, I errr... I apologize for my tardiness..."

"Oh, it's perfectly fine, your Highness..." The lead pony in the group, who was an older mare with a kind and experienced smile, bowed respectfully to the two Alicorns. Her two assistants, who appeared to be identical twin unicorns of both genders, also bowed without hesitation. The older mare was the first to lift her head back up and address Luna directly. "And might I add, we couldn't be happier with your cooperation for this promotional video. We know that this is a lot to ask for, especially for somepony with as high of status as yourself..."

That point was enough to make Luna struggle not to wince through her forced smile. However, there was still enough discomfort in her expression to make Celestia stifle a silent snicker. Luna took a deep breath, and looked like she was about to say something. However, she was cut off while her muzzle was partially open. "...I--"

"But with all the funding we were able to receive for your charity drive, it means so much to know you're just as dedicated as we are~"

"W-Well, that's all very kind of you to say, and I--wait..." Luna stopped her words long enough to narrow her eyes in confusion. She blinked a couple times while processing what the mare just said. That gave Celestia the opportunity to ask curiously, "Oh, her Charity drive, you say? You mean the one that directly benefits Equestria's orphanages and foster programs?"

Luna looked like she wanted to snap when she whipped her head back at her sister. But despite her warning stare, the older Princess kept an innocent smile when she glanced back at her. Luna quickly recomposed herself before any of the ponies before them could notice, and breathed out calmly. "Whoooo... I, ummm... I actually wasn't aware that my charity was connected to this..."

"Well, you'll be happy to hear that Princess Twilight Sparkle took it upon herself to reach out to your organization with the statistics you accumulated through her research. And after coordinating with all of the top healthcare and medical providers in Equestria, we've managed to get multiple diaper manufacturers to fund your research for possible patenting!"

Luna's eyes shot wide-open, while her muzzle remained agape in conflict. Even though she knew she should've been thrilled by such a wonderful act of coordination, she was now left to ponder the consequences she was contracted for. Her eyes veered back at the clipboard still in her aura, with her sister helping to rearrange the papers back herself with her magic. Luna tried not to groan when her main schedule was brought back to the top of the stack, along with those damning notes...

"Hmmmm... S-So..." Luna looked back at the smiling ponies with her eyes slightly narrowed. "I, errr... I couldn't help but notice the notes regarding my, errr... participation in this particular filming..."

Celestia already got a glance at the notes herself, so she just averted her eyes with a knowing smirk and chuckled to herself. Meanwhile, Luna tried not to cringe worriedly at what the ponies before might try to say. Unfortunately, the mare only needed to take one look at the clipboard before nodding in clarification.

"Hmmm, oh yes! In accordance with Equestrian health and safety laws, as well as abiding to federal labor regulations, we can't legally allow a child to partake in this video without proper permits. It would have to be a legal adult for the actual demonstration. I'm sure you can understand."

"Well, I... Actually, that is a fair point... B-But I was referring to my participation..."

Luna looked back at the clipboard with her muzzle skewed. Before any of the ponies could ask what was wrong, she stared back at them with a heavy blush. "A-Are the organizations aware that these contracts state that the 'Adult' in question was... M-Me?"

"Well, of course!" The male twin spoke up with a cheerful smile. "Heck, that got so many of the diaper companies to fund this commercial! They were practically begging to contribute!"

"Eventually, Twilight reached out to your charity to negotiate a deal, and we already got a lot of positive reception!" The female twin lit up her horn, and floated out an invoice containing many numbers (particularly lots of zeros at the end of many of them) towards the Princesses. Celestia gasped with a hoof over her mouth, looking absolutely stunned by the number accumulated for such a noble cause. Luna was just as shocked when she saw the total raised, which almost made her tear up with pride. But after a forced sniffle, she quickly turned back to the group with her breath much shorter than before.

"Ohmigosh, I... I had... I had no idea..." She closed her eyes and took a couple deep breaths before speaking more graciously. "I... I can't p-possibly thank you enough. I just... I wasn't prepared to learn such a thing..."

"Well, it was meant to be a surprise," admitted the head mare with a shrug of her own. "But since we need your written consent anyway, we should clarify that yes. We were needing you, Princess Luna, to be the pony wearing our diaper for this commercial."

Luna's throat tightened up, but she kept herself from gulping audibly and showing her shock. Celestia took notice of a large saddlebag hanging over the stallion's back, and used her magic to open one of the flaps curiously. He took that opportunity to pull out the item in question, which looked to be a large white rectangle made of crinkly plastic. Luna's muzzle clenched tightly, and her blush became heavier when that adult-sized diaper was hovering in the air.

"We already knew your measurements, so hopefully this should fit you perfectly." He used his magic to open up the diaper, showing off the plush and soft white padding inside the garment. Luna squirmed a little through her blush, but she wasn't able to keep smiling. She even looked away for a moment with a silent "What the heck?!" mouthed in her sister's direction. Unfortunately, all that Celestia did was shrug with a smirk back at her.

"Would you like a private room to try this on, or would you prefer one of us to help you apply it correctly?" The female twin seemed innocent enough to ask that without any shame or judgment. "You'd be surprised how difficult applying tapes can be, especially when wearing a diaper yourself."

"W-Wait, you... You mean right now?!" Luna couldn't hide her surprise, and seemed rightfully baffled by such a revelation. She didn't want to rock the boat too badly with so much donation funding on the way, but she felt like things were going a bit too quickly for her liking. But even with her hesitation, she was able to hold her hoof out long enough for the open diaper to be floated into her grasp. She winced when she felt how soft and crinkly the material felt, clearly meant for an adult to wear and use as intended. "Hmmmm... Well then..."

She may have wanted to protest, but her pride was too strong for her to question the process. For the greater good, the Alicorn decided to merely breathe out and accept her fate, damning any personal woes. She glanced back at the door for a moment, but then turned back to the ponies to ask, "Could I remain standing, or..."

"Oh! Yes, your Highness, that's not a problem at all..." The head mare used her magic to float the diaper back around Luna's backside. Celestia stepped back with a chipper smile, but remained politely silent for the duration. Luna begrudgingly widened her hind-legs as she lowered her head, and then closed her eyes before briefly lifting her tail. The mare quickly used her magic to slide Luna's tail through the diaper's elastic opening, allowing the garment to snugly wrap around the dock. The fluffy padding was easily wrapped around Luna's legs and waist, hugging her from all around with all the cuffs properly secure. She took a breath when the felt the waistbands tightening around her, just before the tapes were applied and securely fastened to her sides to ensure a cozy fit.

"O-OH! Oh my..." Luna was taken aback by how quickly the diaper was applied. She was still standing upright, but now she was sporting the foalish garment that stood out quite prominently against her thin figure. She tried to look back at the diaper on her rump, but accidentally did a full circle like a cat about to lie down for a nap. She quickly stopped with an embarrassed huff, but was thankful that none of the ponies seemed to find her attire humorous or inappropriate.

"Hmmm..." Luna took a moment to move her legs slightly, and grimaced from the audible crinkle she heard against her sides. But at the same time, despite how unusual it may have felt, she couldn't say that it was uncomfortable either. In fact, the thick, poofy padding felt surprisingly nice, like a large plastic pillow covering her butt. She eventually breathed out and gave a reluctant shrug. "Well, I... I suppose this will help ponies feel less embarrassed about wearing diapers to bed."

"Exactly!" The lone stallion beamed cheerfully upon hearing that response. "Don't worry, we've already had the products tested, so you should be alright to move around without any obstruction."

"Well, that's good to hear..." Luna was then escorted towards the main room where the filming was being held. It was a large, open space with a metal frame already set up to hold the massive white tarp used as the backdrop. An expensive-looking video camera was already in place, pointed at a large red chair and several foalish toys scattered across the floor. Luna's muzzle tensed up slightly, since she was literally the only one wearing a diaper in that open space. As they walked towards the cameras, she tried to ask one of the assistants, "S-So, ummm... how long is this shoot supposed to be?"

"Oh, don't worry, your Highness. This is just a simple PSA advert, so the actual video should only be a couple minutes at most. We'll most-likely get all the shots we need in less than two hours."

"T-Two hours?!" Luna looked absolutely flabbergasted, but her sister quickly leaned in with a more understanding smile.

"You think that's bad? Try cameoing in an action blockbuster film. I literally had a ten-second clip, and I was stuck on that set for over eight hours. And I didn't have the benefit of wearing my bathroom breaks~"

That little quip got the other ponies to chuckle, which made Celestia shrug with a cheeky smirk. Meanwhile, Luna's eyes widened with the realization of that last remark being a possibility. She hated to admit it, but she was intending to visit the restroom before filming actually began. Unfortunately, now that she was wearing a diaper already taped in place, she wasn't sure how long she could hold out before asking for a break. And considering how tight their schedule already was, Luna had a bad feeling that her Royal lineage won't provide any exceptions.

"Now, did you get the chance to read your lines yet?" The female assistant checked to see that Luna has the scribe included on her clipboard. "I double-checked the numbers, but I want to make sure they were accurate."

"Hmmm..." Luna tried to ignore her diaper as she took a second to read the script hovering in her magic. She nodded with her bottom lip slightly pursed. "... Yes, this appears to be correct. Forty milliliters was what Twilight mentioned earlier..."

As she read through the scripted lines, she tried her best to memorize the individual statements in her head. It was only a few sentences in total, but she understood the importance of punctuation and articulate dialogue while on camera. She may have not been as experienced with performance theater as her sister, but she hoped her acting was at least on par. After reading through the details, she breathed out and waddled towards the actual stage. "Hmmm... so, should I be standing somewhere specific?"

"Yes, just stand right here while he does the white-balance..." The head mare escorted Luna to the stage, while the stallion fiddled with the equipment. Celestia leaned in to see her sister's clean diaper being the main focus of his shot, as the Princess was positioned with her backside facing the camera. Meanwhile, the other assistant readjusted a couple of the stage-lights to better help with the shot.

Luna tightened her muzzle for a second, and readjusted her breathing before rereading her lines. Celestia's head tilted when she noticed the peculiar flings of her sister's tail, as well as Luna's knees trying to bend in ever-so-slightly. Celestia raised her brows, and gave a slight smirk without saying a word. After all, it would be inappropriate to distract someone who possibly needs to use the restroom.

"Hmmm... alright then..." Before the camera could begin recording, Luna decided to take a breath and speak her lines in practice. "For far too long, Equestrian training pants have provided inadequate absorption to help with bedwetting. But with my new Silly Fill--"

"Oh! Ummm, Luna?" The female intern winced a little and tried to correct the Princess. "I think it's 'Inadequate absorption to combat bedwetting.' Not helping it."

"Oh! You are indeed correct..." Luna sighed and continued reading the lines out-loud. "Ahem... 'For far too long, Equestrian training pants have provided inadequate absorption to combat bedwetting. But with my new Silly Fillies Protectors, commissioned by myself, we've developed a new padding that can absorb over eighty milliliters of liquid without spillage. That's more than twice the competition'..."

"Hmmm, not bad~" Celestia shrugged with a confident smirk. "Honestly, I'm impressed you got that so quickly."

Luna decided to glance back at her with a coyer expression of her own. "Well, one of us has to know how, dear sister~"

"Hmph~" Celestia wasn't deterred one bit by her sister's sass. "Says the mare who looks like she needs to use her diaper a little early~"

Luna's eyes shot wide-open, and her open muzzle remained silent for a couple seconds. She then quickly huffed and averted her eyes with a blush. "Hmph..."

"Oh, that's perfect!" The head mare and both assistants backed away from the set, leaving Luna alone in her clean padding. While the stallion stayed behind the camera, and the other intern went towards one of the boom mics, the director tried to get Luna's attention. "You know, ummm... if you need to go to the bathroom--"

"C-Can we just do the lines, please?" Luna said that firmly enough for all the ponies to nod quickly; of course, only Celestia could catch the distinct hint of urgency in her sister's voice. Luna took another breath and stood upright, not seeming to care that she was still having her diaper face the camera. She lowered her head for a moment with her eyes closed, but she got herself back in focus when she heard the director shout, "Okay, take one of the Silly Fillies PSA, and ACTION!"

With a click of the board, the camera was rolling as it took a slow, panning shot up the back of Luna's legs. Meanwhile, the Princess took her time as she spoke with a regal tone of voice. "For far too long, Equestrian training pants have provided inadequate absorption to combat bedwetting..."

By the time the camera pulled up to get a full shot of the padding, Luna's face was still hidden from view as she continued speaking like a narrator. "But with my new Silly Fillies Protectors, we've developed a new padding that can absorb over eighty milliliters of liquid without spillage. Over twice the competition brands..."

When the camera slowly panned back, which gave a full reveal of the pony wearing the diaper, Princess Luna made sure to keep an unflustered smile when she turned her head to face the camera. "And as Princess of the Night, and Co-Ruler of Equestria, I hereby endorse this product myself for authenticity~"

She gave a forced smile for the camera, and had it linger there for a couple seconds before hearing the director yell, "Cut!!~"

The mare leaped out from behind the camera excitedly. "Ohmogosh, that was perfect, your Highness!"

"Yeah, you did great!" The stallion beside her appeared equally as pleased with the results. Even Celestia gave a respectful nod, despite feeling a bit miffed at how effortlessly her sister made that look. Luna sighed in relief, but her hooves remained firmly in place as she looked back at the other intern. She nodded while still holding the mic, smiling just as wide as the others.

"I uhhh... I'm not sure if I can do another take that well~" Luna let out a nervous giggle, and hoped that her statement could be an adequate cover for her blush. Despite how happy she was about that take, she was afraid of repeating that speech multiple times regardless. Not to mention, her lips pursed together to conceal a brief grunt, and a long exhale came out silently through her nostrils. She didn't dare say anything, but she was already regretting her breakfast choices earlier that morning.

"Oh, don't worry! I think we can focus on action shots from here on out. Although..." The director paused when she noticed Luna's distress. She glanced over at Celestia, who just gave a knowing nod and shrugged playfully enough. She then turned back to Luna, and tried not to appear nervous when she asked, "So, Princess... Do you actually need to use the bathroom right now?"

Luna winced worriedly, but could only huff in defeat. She didn't like the idea of admitting something so personal, but she also didn't want to affect the studio's already-packed schedule. She looked down at her diaper for a second, and visibly cringed from the idea of actually using it like intended. But alas, the Princess nodded reluctantly. "I ummm... I might have needed to go before this shoot, but I'll be fine. I can easily wait until filming has finished."

The three ponies all looked at one another in silence, sharing looks that got Celestia more intrigued. Luna began to look concerned herself, just as the director turned back towards her with narrowed eyes. "Hmmmm... actually, if you want... I could possibly get some good shots of the diaper being used to prove its effectiveness~"

Luna's head reeled back in shock, but Celestia was the first to speak up with an intrigued smirk. "Ooh, that could be interesting to see on camera~"

"N-NO! No it would not!" Luna gawked at her sister with great offense. "Celly, you can't possibly--Oooofffff..."

Luna wasn't one to be interrupted so brashly, but the sharp churning in her stomach seemed to do the trick. She gritted her teeth with a forced breath, and used a hoof to clutch her belly briefly. The pressure subsided enough for her to sigh in relief, but she knew that was only temporary for now. Regardless, she still glared at Celestia with a raised hoof. "Nnnfffff... Not a word, sister."

"Now, come on, Luna..." Celestia walked past the camera so she could talk with Luna directly on set. "I mean... we are at a studio filming a diaper commercial. And these ponies are professionals, after all..."

Celestia kept a warm, but insistent smile as she perked her brows at her sister. Luna's expression flattened in response, and her eyes darted between her sister and the ponies behind her. "You... You really want me to do that here? In front of them?"

"Well, the camera too," added Celestia pointedly enough to make her sister grimace. "But yes, I think it would actually be a great addition to the commercial. Don't you guys agree?"

She turned back to the others, who all nodded with approving smiles. The stallion even perked up to add, "W-Well, I mean... Think about it like this: If you're willing to use the diaper on camera, every filly watching would know it's okay."

Lune wanted to say something, but stopped herself long enough for her expression to change. Her brows perked up, and she stared up at the ceiling for a moment before shrugging her head. "Hmmm... I... I actually can't dispute that point..."

"Also, uhhhh... I should clarify that we don't really have too many spares in your size yet..." The female intern pointed over to a small sample pack nearby. "And the tapes aren't the best when they're removed, so the one you're wearing would likely be thrown away after the shoot anyway."

"And if it helps..." Celestia brought her sister's attention back towards her, and she kept her smile when she gave a promise. "If you do decide to use the diaper to save time, I'll change you myself like a good sister~"

Luna's eyes widened, while Celestia's confident smile remained unchanged. The younger Alicorn blinked a couple times, before eventually realizing that Celestia was being serious. She turned back to the others, and saw that the stallion was already checking the camera in preparation for more takes. Luna's blush deepened quite a bit, but the head mare was quick to reassure her, "It's nothing to be ashamed of, your Highness. That's exactly what the diaper is made for, after all~"

While that fact may have been true, it also made Luna's muzzle skew uncomfortably. It didn't help when she tried to readjust herself, and was instantly met with a familiar strain just above her nethers. She groaned with a bitten lip, but she could still feel her bladder quite prominently alongside her bowels. She may have felt the urge building up for a while before even coming to this studio, but she assumed it'd be easy enough to hold it for the duration. But now with everyone around her standing in wait, Luna felt more than a little hesitant to do as expected.

"Nnnfffff..." She fidgeted a little, and turned back to Celestia to see her warm and comforting smile. The older sister already stepped back so she was out of the shot, leaving Luna to stand by herself while the camera was pointed at her backside. She sighed pertly through her nostrils, before asking the director, "Is... Is it really alright?"

All of them nodded with kind smiles, with Celestia repeating herself assuredly. "It's okay, dear sister. No matter what happens next, I'll clean you up when we're finished."

Luna sighed with a reluctant smile, and lowered her head in acceptance. Even though she felt like she could waddle off to use an adult toilet, she felt more compelled to just continue with this shoot like planned. Nevertheless, even when the Princess lowered her head to control her breathing, it took her a moment to get her body to relax accordingly. Meanwhile, the stallion behind the camera silently zoomed in to get a good view of the Alicorn's padded rump.

"Mnnnghhhh..." Luna knew that the diaper would most-likely do its job, but it wasn't easy being tasked to wet herself after years of rigorous toilet-training. The mental block was more than enough to make her muzzle tighten up, and her nostrils to flare out in worry. She whimpered a little when she felt the dam weakening little by little, until the tiniest bit of urine leaked out and made her shiver. She grunted and froze up, instantly stopping herself before she could begin. But before any of the ponies could try and ask if she needed any help, they remained silent just long enough to hear a long, soft exhale escape from Luna's lips.

"Aaaaaaaaahhhhhhh..."

'Psssssssshhhhhhhh...'

The fur along her back stood upright for a moment, while her hind-legs trembled a little with her knees buckling. She closed her eyes a bit tighter, but her deepening blush was accompanied with a more relieved expression that made her sister smile. The camera was recording with the boom-mic right over Luna's rear, which just barely got the hissing noise emanating from the padding while it began to bloat out. The diaper swelled out quite a bit as it soaked up the Princess' full bladder, until the white plastic began to show a distinct yellow hue. The Alicorn wasn't able to stop peeing, even as she felt that vibrantly sudden warmth pressing up tightly against her nethers.

"OoooOOOOooohhh..." Luna shivered with a guilty blush, but wasn't able to stop urinating after the floodgates were opened. Her diaper swole out even more, until she had to widen her gait and make her hind-legs part a little more. The bottom of her padding eventually hung down a few inches lower than before, with the elastic cuffs still securely wrapped around her legs and waist. Luna sighed and threw down her head, but her backside remained upright while her wet diaper was recorded in full. By the time she finally finished peeing, Luna shuddered as she felt the content sloshing around between her legs. "Mnnnnnghhhhh..."

"Wow, that's a perfect action shot!" The stallion beamed excitedly from the footage they got, with the other two ponies nodding their heads. There was a secondary monitor beside the camera, so the director was able to rewind the recorded footage and see how well the wetting looked on camera. Celestia took that moment to walk up to her sister, and nuzzle her sweetly from the side. Luna groaned with a pout when she looked up at her.

"Please don't say anything," she muttered warningly. She wasn't sure how well her glare worked after just pissing herself, but Celestia kept a smirk while silently giving a 'lock-key' motion over her closed lips. She then helped Luna to stand back upright, even while wearing a freshly yellowed diaper against her rump. Celestia took a moment to hum in contemplation while staring at it.

"Hmmmm... that does seem to absorb an adult amount surprisingly well..." She glanced back at the other ponies briefly, and saw that they were all double-checking the footage for any errors. She took that moment to turn back to Luna and lean in close to her ear. "So, sister, I must ask... Do you still need to go?"

Luna closed her eyes as tightly as her muzzle, but her long and strained exhale through her snout was as good of an answer as any statement. Nevertheless, Luna eventually looked back at the other ponies for a second, and then back at Celestia with a feeble nod.

"Nnnnffff... I-I ummm..." Her head lowered with a deeper shade to emphasize her embarrassment. "I... I don't know if I... if I should..."

Celestia sighed pertly, keeping an understanding smile as she nodded. This may have been amusing, but she also knew how traumatizing this must've been for her sister. But with her muzzle still close to Luna's flickering ear, it was easy for her to grow a cheekier smirk away from the other ponies' eyes. That was when she narrowed her eyes on Luna and whispered faintly:

"If you can do it for me, I promise I'll change your diapers myself~"

Celestia then pulled back, just as the director looked away from the minotaur and shouted, "Oh, it's perfect! The diaper worked exactly as planned, and it looks incredible on camera!"

"O-Oh! Ummm... T-That's quite nice..." Luna was still a little frazzled after her sister's reply, which made her blink a couple times in befuddlement. She needed a couple seconds before nodding happily to the ponies' positive response, but her smile was short-lived when she turned back towards her sister. Celestia shot her a sly-looking wink, before her eyes visibly drifted back down her sister's back. Luna shivered a little when she stared back at her diaper as well, just as a sharper groan came from her stomach. "Nnghhh..."

"Is something wrong, sister?~" Celestia made sure to ask that loudly enough for the other ponies to hear and turn to Luna with concern. The younger Princess huffed silently with a miffed stare, but rolled her eyes as she looked away from her.

"Ughhhh... I, uhhhh... I was needing to errrr... c... c-continue..."

Her deepening blush, combined with her averted gaze from the ponies, was enough indication that their next "action shot" was likely to happen next. The stallion and assistant mare quickly went back to the camera and mic in preparation. The director, much like Celestia, kept an impressively still smile and nodded in approval.

"Aaahhhh, I see... Do you need to go in your diaper now, Princess?"

Luna closed her eyes with one final breath, which turned to a whinny halfway before she muttered, "I... I ummm... I do, yes."

"Well, go right ahead and use the potty when you're ready." She and Celestia made sure to step back, giving Luna some space while she stood alone on the set. The Princess turned her head away from all of them, wincing from the realization of what she was about to do. Her heart was already racing badly, and it didn't help that her privates were still pressed up against all that warm padding to keep her blushing so deeply. Another heavy strain on her stomach made Luna grit her teeth, and her knees bent down the tiniest bit. However, the Princess refused to squat down while the camera was getting a prime recording of her partially-yellowed backside. Instead, her brows furrowed for a moment before her muzzle tightened into a concentrated scowl, just as her tail lifted up instinctively. The director got in place and whispered to her assistants, "... aaaaaaaaand action!~"

"HNNNGHHHHH!!"

Her lips nearly turned white from how tightly she pursed them together, but a hefty groan still escaped her muzzle as she shivered in place. While her hind-legs tensed up greatly, her rump lowered just a little more before the padding could be seen expanding out beneath her tail. She admittedly didn't need to push too hard, since it was easy enough for the mass of filth to start coming out after her earlier wetting. Regardless, she hoped that her straining face wasn't visible on the camera while she pooped herself.

Her diaper continued to bloat out slowly, with the white plastic beginning to darken in hue as soft lumps pushed through the formerly smooth plastic. The diaper was thick enough to muffle most of the unsavory noises, but that didn't mean much when the boom-mic was hovering just out of shot to record her messing. Luna's muzzle eventually opened up, but she remained silent while feeling every ounce of filth that was leaving her body and weighing down her padding. That familiar warmth she felt before was now back in full-force, and now with an additional heaviness that made her grimace with a blush. The smell was absolutely putrid, but it was difficult for Luna to focus on that when she felt so many different sensations at once. The intense soft, mushy warmth pressed harder against her rump the more she pushed, most likely due to how quickly she managed to fill the diaper from the back.

"Oh my..." Celestia spoke softly to herself while watching her sister going for everypony to see. The white padding was now showing a dark-brownish hue, which only became heavier to match the added weight. It was hanging down a couple more inches, and was now close enough to the floor to leave a visible shadow. The older Princess bit her lip pensively, and tried to hide her blush from the others while spectating the live show. Luckily, the other ponies were more focused on the Alicorn emptying herself out.

"Nnnnfffff...' Luna hung her head and clenched her eyes shut, allowing her body to work more freely without giving much exertion. After that first push in the beginning, it was easy for her to just continue pooping without any effort. Her muzzle eventually reopened to let out a soft sigh, just as a thick volley of her mess swelled out the back of her diaper even more. The stallion behind the camera mouthed a silent "Wow" to himself, since he got an upclose view of the diaper's absorbency against such a big load. Luna had her back turned to all of them while she went, and she eventually breathed out in contentment when she felt the last of her mess slipping out. "Aaaaaahhhhhh~"

Luna may have still been standing upright, but only barely so. While her hind-legs remained standing rigid, and even re-lifting so her brown and saggy diaper could pull away from the floor, her front-end was crumpled on the floor like she was presenting herself to everypony. Her messy diaper hung tightly against her backside, with the tapes staying firmly locked against the sides to ensure nothing leaked or spilled. When she finally pulled herself up on all fours, Luna shuddered with a sharp grimace while hiding her face from everyone. "Mnnnghhhh... I-I ummm... I'm finished..."

"Hmph~" Celestia couldn't help smirking a bit when she huffed in amusement. "I certainly hope so. I'd be worried if you had more in you than that~"

Luna silently seethed and glanced back at her with a bitter glare, but she was still blushing rather deeply. Her sagging diaper now had a sizable bulge hanging from her rear, with the brown and lumpy mass looking remarkably large in comparison to before. Luna didn't want to look back and see the damage herself, but she felt it well enough to keep her expression tightened in discomfort. However, before she could ask for a much-needed change, her ears perked up when she heard the director speak.

"Ooh, that was a wonderful shot, your Highness! We won't need to worry about any alternate takes, so just stay right there while we get the stool."

Luna quickly turned her head to stare back at the ponies wide-eyed. "W-What?! What stool?!"

Celestia chuckled slyly. "What, aside from the stool you're currently wearing?~"

"CELLY!" Luna snapped at her sister with a miffed tone, but thankfully not her Royal Canterlot voice. After making sure the boom-mic wasn't too close to hurt that assistant nearby, Luna huffed and added firmly, "I would greatly appreciate it if you didn't make fun of me right now!"

"I promise I'm not," she assured with a raised hoof, and even smiled warmly to add, "In fact, I think you look quite cute as a Poopy Widdle Pwincess~"

"Nnnnghhhh!!" Luna looked away with her teeth gritted, which thankfully kept her from seeing the other ponies struggling not to snicker. While it may have been rude to find humor in a Princess' discomfort, it's not everyday that somepony hears Celestia say such a thing out loud. While her head was away from them all, she breathed out slowly and tried to keep her blush from growing hotter against her face. Her hind-legs also twitched a little, which in turn made her shiver from that mushy padding moving ever so slightly. She tried to ignore how... differently that sensation felt, and soon noticed the small plastic stool that was floated out by one of the unicorn's auras.

"Here you go..." The mare operating the boom-mic placed the bright-red stool on the set floor, right behind Luna's messy diaper. "All we need to do is get a few shots of you sitting down, and then we can get you changed."

"S-SITTING?!" Luna gawked at all of them with her face a beet-red. "I-In this?!"

"No, in clogs and a tutu. Of course they mean in that!"

Luna nearly chewed her sister out from that quip, but she stopped herself long enough to sigh and accept her fate. She turned back to the director meekly. "Y-You... You really need me to do that?"

"Well, it's the best way to show how durable and leak-free the diapers really are." She shugged with a non-judgmental smile. "I mean, if they can withstand a Princess-sized mess, there would be no doubt that foals can use them safely."

Lune opened her muzzle for a second, but paused long enough to think that over and shrug with an impressed pout. "Hmmmm... That's... That's actually a fair point."

"Alright, the color-balance is still good," said the stallion who was double-checking the camera for his next shot. "I'll just keep the film rolling, and you can take your time sitting a few times, Princess."

"Ummm... O-Okay..." Luna winced with her head turned away for a moment, cursing herself for agreeing to such an egregious measure. However, after defecating in her padding on camera, she knew she wasn't going to maintain much dignity if she refrained now. So with her muzzle skewed in uncertainty, Luna breathed out and decided to just go for it. As soon as she heard the Director call out, "Action!", the Alicorn tried to ignore that added weight against her rear and use it as a cushion.

"Nnnnfffff!!" Luna sat down on the stool, eliciting a wet and crinkly squish that covered the silent gasp that escaped her mouth. The brown, mushy load spread out as soon as weight was added to the back, which caused all that mass to smear across both of her cheeks and elsewhere. She groaned a little through her teeth, but maintained her composure well enough to remain seated on the stool. After a couple seconds, she lifted herself up to show a much flatter, pressed-down padding that was still a rich shade of brown. Luna made another winced shudder, but her bottom lip was bitten tightly with a conflicted look. "Hnnnnngghhh..."

Since the camera was still rolling, nopony said anything and allowed her to continue. Luna took another breath, and closed her eyes before sitting down on the stool again. Another harsh shiver swept across her body, but she tried to sit in place a little longer and let her weight push that mess around. The intense feeling of all that warm, sloppy filth pressing against her was a sensation she never thought she'd feel (at least not in this way), and it was enough to keep her lip bitten. By the time she lifted herself back up a second time, Celestia was able to notice her peculiar look; however, the Alicorn kept that to herself and didnt say anything.

Luna kept her muzzle clenched, and tried to focus on breathing through her nostrils. She took her time as she tried to give some good shots for the camera, and spent a couple minutes repeating the motions a few more times. Each time she sat down to press against her soiled padding, she tried not to grunt too audibly from how grossly stimulating it all felt. She also had to clench her wings tightly against her back, not wanting them to fling out or twitch to ruin the ponies' shots. By the time she felt like her diaper had been effectively squished to prove its durability, she sighed deeply and stood back up to show her hind-legs were still dry and clean. "Mnnnghhh... Th... There..."

"Oh, perfect!" The Director beamed happily when she saw how well the diaper handled Luna's mess. "My goodness, I'm impressed with those cuffs! Do you feel any leaks, or uhhh... blowouts?"

"I... I don't think so..." Luna took a moment to inspect her soiled diaper, and lifted each hind-leg individually to test the elastic cuffs. Fortunately, even with so much of her waste sloshing around and packed against her rump, the diaper remained stable and held everything in place. She breathed out in relief and glanced back at her sister. "Well, ummm... I guess I don't need to worry about the product's quality."

"Well, not on the outside, at least..." Celestia made sure the camera was no longer recording, and walked onto the set with her horn lit. The Princess noticed the production ponies' diaper bag nearby, and took the opportunity to float it over and retrieve some supplies. She unrolled a large, brightly-colored floor-mat, which she laid out on the stage floor in front of her sister. Luna's eyes widened worriedly, and she looked back at the other ponies who were getting their equipment in check.

"Ummm... C-Celly?" She turned back to her sister with her blush quite prevalent. "Are you... Are you going to do that here?"

"It won't take long, I promise." Celestia got the leaning supplies out of the bag, and asked her, "Would you like to be in another room? I doubt these ponies would mind me changing you here."

Luna wasn't able to speak up before the Director did herself. "Oh, that's perfectly fine. In fact, we were considering filming a diaper-changing video sometime soon for another educational project."

"But the camera is off now," assured the stallion who pointed over at the inactive device. "We swear, this won't be recorded or spoken outside this room."

The other mare nodded happily, while Luna stood with an uncomfortable wince for a couple seconds. However, when she looked back at her sister, she blushed when Celestia smiled and patted the mat with a hoof. Luna looked around briefly, but decided it was better to get out of this dirty diaper now than later. So with a soft sigh, Luna hesitantly walked over to the mat and lowered herself down. "Hnnnnnn..."

She eventually got herself on her back, with her hind-legs spread apart and her diaper on full display. While the other ponies stepped back to give the sisters some space, Celestia kneeled down between Luna's legs and sat across from her. She got the wet-wipes container floating in her aura, while her hooves went down to grip her sister's tapes. "Are you ready?~"

Luna closed her eyes to take a breath, and slowly exhaled before nodding her head. "Ummm... Y-Yes, sister..."

With that, Celestia nodded before pulling off the four tapes one by one.

"Oh my!" As soon as she lifted the front flap away from Luna's waist, Celestia gasped and accidentally let go when her hooves flung back instinctively. Because of that, a wet 'splat' could be heard when the full, soggy diaper dropped down to the floor. The hefty mound of Luna's mess was now on full display, which was solid enough to form a slight imprint of the Princess' crack from how many times she packed it down. Her cheeks were also completely matted in brown, as were her nethers and a good portion of her fur. The ponies nearby were staying respectfully distant, but Luna could sense that they were likely curious to see such a thing themselves. Nevertheless, Celestia gave a positive response when she chuckled with a hoof over her snout.

"Hehehehe~ My goodness, sister! If I didn't know better, I would've assumed you had thirds last night!"

Luna blushed deeply and hung her head low. Her muzzle grimaced slightly, and she tried to ignore the open diaper between herself and her sister. "Mnnnnghhh... P... P-Perhaps..."

Celestia narrowed her eyes on her sister with a more gleaming smirk, which seemed to be enough to make the younger Alicorn wince. She clenched her eyes guiltily shut before muttering in addition, "A-And I had seconds of breakfast too..."

"Ha! I knew it~" Celestia didn't seem to mind her sister's appetite, even if it meant such a heavy aftermath that completely coated the inside of Luna's padding. She used her magic to quickly lift up Luna's legs, and slide out the soiled diaper without a second thought. "Honestly, I might need to use a second diaper for cleanup..."

Luna winced. Hard. Her legs clenched tightly in her sister's grip, but nothing could be done to hide her marehood when it was spread open. Celestia first lowered a fresh, open diaper below her sister's messy rump, just to serve as a better cleaning surface. She then floated up a couple wet wipes, which she held in her hoof before reaching down and wiping straight down the middle.

"HUUUHHH!!!~" Luna's back arched inward intensely, and she gasped hotly with her eyes rolled back. Celestia thankfully only needed one wipe to get her sister's marehood cleaned, leaving it pristine and slightly parted between those open legs. Of course, Celestia's focus resumed on the main task as she dropped the dirty wipe onto the clean padding, and got another to begin cleaning those cheeks. All the while, Luna quivered with her eyes clenched shut and struggled not to whimper too audibly. "Mnnnnghhh..."

"It's alright, Luna. I'll get you cleaned up properly..." Celestia took her time with the wet-wipes, and was generous enough to use multiple ones for each cheek. Although to be fair, the mess had matted deep enough into Luna's fur to make her want to schedule a bubble bath as soon as this shoot was over. But in the meantime, all she could do was lie back and stay hanging suspended in Celestia's aura. The older Alicorn kept a warm and diligent smile, not minding one bit about how many messy wipes she placed inside the spare padding. "I must say, I really am impressed with how well that diaper held up! You handled it like a natural~"

Luna knew that she was just trying to be nice, but it was still sincere enough to make her smile with a blush. She shuffled a little on her mat, and sighed pertly when one of those wipes got right under her tail. With her legs still spread wide apart, the cold air and titillating sensation seemed to make her squirm more hastily. But alas, despite her grimaced face, she heard a surprised "Oh!" that made her cringe hard.

"My goodness..." Celestia made sure the ponies nearby weren't able to see anything, and then shot a smirk down at her wincing sister. Between Luna's legs, even while in the middle of a diaper change, her marehood was winking readily with a visible sheen of arousal glistening her lips. The sister huffed in amusement, not the least bit embarrassed about seeing such a thing. In fact, it made her smirk and tilt her head before whispering, "Dear sister... Do you like having your poopy diaper changed~"

"Mnnghh!!" Luna shot a wide-eyed glare up at her sister while her muzzle was clenched in great offense. Unfortunately, despite how tightly she pursed her lips, her other pair parted a little more to give a profound wink between Luna's legs. Celestia took that response with a cheeky nod, while Luna gasped through her nostrils and struggled a little against her sister's magic.

"Ahh, ahh, aaaahhhh~" Celestia reached down with a clean hoof to press against her sister's lips. Luna understandably reeled back, but was able to smell nothing on that hoof to warrant immediate alarm. That was when the older Alicorn leaned in even closer, and spoke in a faint and articulate voice. "Before you respond too strongly, I just want to clarify one thing that I still hold to heart..."

She pointed down to Luna's nearly-cleaned rear, as well as the diapering setup beneath her, and said with a genuinely sincere smile, "I said that I would gladly help with any changes that you may need, dear sister. And that fact hasn't changed one bit~"

She shot Luna a sly wink which was enough to make her blush deeply. Luna was at a loss for words, and she had to sputter out flusteredly, "W-Wait a minute, you... Y-You mean..."

Her eyes veered down to her still-exposed marehood, as well as the dirtied diaper that was slid out from the mat. Celestia got the last of her sister cleaned off, and rolled up all the dirty wipes in the second diaper. She then used her magic to safely hover away both rolled-up balls of Luna's soiled aftermath, which were tossed into a metal pail with a streamlined lid. Luna was then lowered back onto the mat, with her rear end bare and her fur pristinely clean.

"Yes, Luna." Celestia didn't wait for her to finish that question, and merely nodded while her sister was left blushed and speechless.

Her marehood appeared to be much wetter by the time her legs closed back shut, but it took a second for Luna to get herself together and lift up from the floor. When she did, she sucked in a deep breath and grunted as she struggled with her wings. Despite how stiff and rigid they were trying to get with their antsy twitches, Luna had enough fortitude to force them against her back, hiding any inappropriate social faux-pas' out amongst the public.

Luna was eventually able to stand back upright, despite her quivering legs and shaky breaths. Even though she just emptied her bowels in front of everypony with a live diaper change, she was now standing around like nothing had happened. It was almost surreal, though she knew better than to say anything about it. Afterall, considering what just happened, she should've been absolutely grateful for how well everyone handled it.

She sighed and shook her head, needing a moment before muttering under her breath, "H-Honestly, I'm just grateful nopony made a big deal out of this. It made my enjoyment all the more--MMPHH!~"

Luna tensed up with her eyes wide-open, frozen in shock from what she just said out loud. She may have been far enough from the production ponies to worry about them eavesdropping, but that didn't mean much when Celestia was standing right there. The younger Alicorn's eyes went wide in an instant, before slowly veering back to see her sister's response. Unfortunately, Celestia was looking just as stunned as her while stifling a giddy smirk. Meanwhile, Luna's muzzle just remained slightly agape with nothing else able to come out. "... uuuuhhhhhhh..."

"Hmph~" Celestia quickly grew a more confident smile, and she narrowed her eyes on her dear sister with a passionate glimmer in her eyes. She lit up her horn ever so slightly, just so she could conjure up a small invisible bubble of her near-transparent aura. She quickly covered herself and her sister within the aura, encasing them in a totally soundproof space only they could hear within. Outside the bubble, none of the oher ponies realized that the Princesses were effectively muted while their faces were out of view.

"Alright then, Luna. I want to make a deal with you..." She motioned over to the package of spare diapers nearby. "If you're willing to go up to those production ponies to request those diapers to take home, I promise that I'll help you change every single one. Regardless of the time of day, or even location. All that I ask is that you truly enjoy them, like a good filly should~"

Luna blushed even deeper, and gulped nervously when she saw the conviction in her sister's sultry smirk. She hated to admit it, but her legs squirmed hotly from the impure thoughts swimming in her head. The idea of actually considering that plan was beyond asinine, and more than enough to warrant a scolding to her sister; but at the same time, it was hard for her to think too clearly while trapped within her sister's aura, as well as her own confusing feelings on the matter. Her lips pursed tightly for a second, and she took a breath before looking up at her wide-eyed.

"You... You really mean that?" Her eyes darted back and forth briefly. "E... E-Every time?"

"Every. Single. Time~" Celestia reached in to place her hoof beneath her sister's chin, and lifted her head up so she could stare at her directly. "All that I ask is that you actually use them. Whether you do it in private or public is up to you, but I'll change your diapers regardless. How does that sound?~"

"Ummm... W-Well, uhhhh..." Luna took a moment to look down at her hooves on the floor. She pondered her options, all while keeping her wings tucked in and her tail bunched between her legs. She didn't want to say anything out loud, since she was still processing her newfound feelings herself. But after a flustered breath, she lifted her head up and motioned towards her sister's aura. "M... M-Might you please bring down the barrier, sister?"

"Absolutely~" Celestia turned off her horn, and stepped aside so Luna could make her decision. She only needed another second before breathing out pertly, and walking up to the Director and her two assistants. She cleared her throat to catch their attention, and stood before the head mare to make a request.

"Miss Director? If... If it isn't any inconvenience to you or your production, I..." She nearly froze up with a worrisome wince, but managed to keep her resolve well enough to breathe out and speak directly. "... I-I was curious if I could perhaps... bring some of the spare diapers back with me for further testing?"

She tightened her muzzle with a panicked pause, frozen in fear of how the commoner would react to such a question. However, the Director just smiled with a nod, and floated over the package without any objection or judgment. "Oh, absolutely, your Highness! Here you go... Is there anything else?"

Luna took the package with a wide-eyed look of surprise, but quickly reconfigured herself and nodded graciously. She took a second to turn her head, and saw Celestia smiling with a supportive nod of her own. Luna took a second before smiling back, and then decided to take up the Director's offer. "Well... Actually, now that you mention it..."

Luna took a deep breath, and turned back to the ponies to state, "Since they're confirmed to be in my size, I would like for a personal package of these diapers to be shipped regularly to my personal quarters, please."