Author's Note

The only suggestion I got for this chapter was from Tiber Septim II, who suggested that Twilight should play train with Princess Celestia. Scootabom1 did propose the idea of Spitfire being recruited due to her having issues with children (which was established in Friends Forever #11).

In case you're wondering about Spitfire's comment about not being captain, in this fic's prequel the Rainbow Dash chapter ended with Rainbow being promoted to captain of the Wonderbolts. So I wanted to make sure that was acknowledged.

In keeping with the new rules I established in the previous chapter, any character previously voted for will receive only half a vote if they are mentioned again. But any character not previously mentioned will get a full vote. And I will also remind you of characters that are ineligable to be voted for.

Characters ineligable under any circumstances:
Starlight Glimmer
Discord
Trixie
Sunburst
Cutie Mark Crusaders
Flurry Heart
School aged or younger children (i.e. Cake Twins)
Characters introduced after Flurry Heart (Starswirl the Bearded, the Pillars, Star Tracker, Mudbriar, etc.)

Characters that can only be done in group pairings:
Mane six
Spike
Princess Cadence
Shining Armor
Princess Luna
Octavia and Vinyl Scratch
Twilight Velvet
Spitfire (with or without Wonderbolts)

Characters previously voted on:
Lightning Dust - One and a half votes
Moondancer - One vote
Cheerilee - One vote
Maud Pie - One vote

Spity (Spitfire)

"Come on, Twily," Princess Celestia encouraged in that cooing, motherly tone of hers as she plopped her fellow alicorn onto the toilet seat. "You did it for your brother and for your big sister. I know you can do it for me if you really try."

"But I don't want to, Mommy." Twilight pouted. It was hard to tell if she was being sincere or just acting up to play up her role.

Celestia simply smiled, pulling down Twilight's diaper. "You promised me you'd try at least once a week. If you really don't have to go potty, I won't force you to go. But you have to at least try," She then stood off to the side. "Don't worry, I'm right here in case you need anything. I won't let anything bad happen to you, I promise. Besides, you wouldn't want the first impression of your next playmate to be you in a dirty diaper, now do you?"

"But they'd be in diapers too," Twilight replied and giggled. "Even B.B.B.F.F. and big sissy wear diapers. Even Smarty Pants wore them once."

"Yeah, and they were super comfy. I wish I could be in diapers all the time just like you, Twily." Smarty Pants cheerfully chimed in.

The sun princess could only chuckle in response. "Maybe, but I still want you to try just the same, Twily. It doesn't have to be a poo-poo, it can just be a pee-pee."

Minutes seemed to pass by slowly as Twilight sat on the toilet, her diaper pulled down to her knees while Princess Celestia and Smarty Pants looked on with watchful eyes. But at last, the younger alicorn rose from the toilet. "I'm done, Mommy. I don't have to go."

Celestia decided it best not to press the issue any further. After all, part of her really didn't want Twilight to ever get out of diapers. "Okay, Twily. We can always try later if you think you want to. And remember, you're only allowed to use the potty with my supervision unless I say otherwise." She then pulled Twilight's diaper back off and led the padded alicorn out of the bathroom.

And just in time, too. Because at that moment, there came a knock at the door to the royal suite the two alicorns were in. The alicorn with a majestic white coat smiled, she knew who was on the other side. Lighting up her horn, she opened the door.

In strolled a pegasus mare clad in a navy blue flight suit. Yet it was possible to make out her gold coat and fiery orange mane and tail. A part of her still looked a bit unsure if the look in her eyes was anything to go by. "You sure this is gonna help me overcome my problems with kids, princess?" She spoke in her signature raspy tone of voice.

Immediately, Twilight's eyes went wide! She couldn't believe who it was! "Spitfire?!" She exclaimed, before hastily retreating behind Princess Celestia! "Y-you're not supposed to see this!"

But Spitfire only gave a light laugh. "Relax, princess, Princess Celestia already filled me in on the details. I promise, your secret's safe with me. After all, I know a thing or two about keeping embarrassing secrets." She seemed to blush a bit as she said that.

Nervously and reluctantly, the padded alicorn waddled out from behind Celestia. "You're here to play with me?" She asked, still hesitant and unsure.

Spitfire nodded quite slowly. "Yup. Figured I could use a break from the Wonderbolts. Rainbow Dash might be captain now, but I still stick around the academy in case she needs my help. And just because I'm not the captain anymore doesn't mean I'm not part of the team. I'll be a Wonderbolt 'til the day I die!" Upon seeing Twilight wince and recoil from her statement, she hastily corrected. "Sorry, sorry. Didn't mean to get so dramatic. Like I said, I'm not really good with kids. That's why Princess Celestia suggested I come here and play with you. She seems to think this'll help me get better."

"Indeed it will. The best way to learn how kids function is to get personal, hooves on experience," Princess Celestia encouraged. "Plus, you can still dip into your usual persona if you need to. Everypony loves a cool big sis."

Spitfire nodded again. "Yup. And from now on, you can just call me Spity. My mom used to call me that all the time when I was in diapers," Then she chuckled. "As a matter of fact, I kind of still am."

Twilight's mouth dropped open in shock! "What? You still wear diapers?!"

"Does that mean you're not potty trained?" Smarty Pants questioned.

The off-duty Wonderbolt giggled not unlike a school aged filly. "Never said that. I did graduate from diapers eventually. Had to to get into flight school," She began to move a hoof to the back of her flight suit. "But when you're up in the air or flying nonstop, sometimes you can't exactly fly off to look for a toilet. Luckily, I always come prepared." Soon, she had yanked off her flight suit, revealing a thick, white, poofy diaper was currently clad around her rump. In fact, it looked a fair bit used if the yellow tint and damp patches were any indication.

Now it was Twilight's turn to laugh. "Oh my goodness! You pee-peed yourself, Spity!"

If Spitfire was at all bothered by that obvious fact, she didn't show it outwardly. "Kind of had no choice. I didn't get a bathroom break before I flew over here. Had to come straight over from my last show, and that was a long one," She patted her diaper. "Luckily, I make sure to get the extra absorbent brands for the Wonderbolts. They're standard issue for long flights, performances, turbulence, and of course stunts. You never know what the g-forces might do to you. No need to pay for dry cleaning. You just let it all out and keep flying. Plenty of time to change afterward."

"Then I hope you won't protest if I change your diaper now, Spity," Celestia motherly cooed. "I can't have you playing with Twily in such a soggy thing. What if you got a rash? That wouldn't be any fun at all."

The padded pegasus nodded. "Yeah, guess it's time for a change. I'm pretty good at it myself, I'm the best diaper changer for all the Wonderbolts."

But the sun princess lifted Spitfire up with her magic. "Ah ah, Spity. Foals can't change themselves, you know. If you're going to play with Twily, you have to get into a foal's mindset the way Twily does."

Twilight nodded while giggling. "Yeah. You just relax and go with the flow. It's so much fun, especially when you have a loving mommy like I do."

Spitfire shrugged, surrendering herself to the inevitable. "Eh, guess I have no choice. Been a long time since I've had somepony change me. Eventually, you get used to doing it on your own. May not be the most fun or efficient thing ever, but it gets the job done."

It didn't take Princess Celestia long at all to remove Spitfire's old, soggy diaper and ball it up for disposal. It took only slightly longer for her to wipe and powder the pegasus, before strapping her up in a new diaper. "Since you're playing with Twily, you can borrow some of her diapers. There should be plenty for both of you." She motherly cooed, before levitating the padded pegasus pony off the changing table.

Spitfire took a moment to take in the scent of a freshly changed diaper and how it felt. "Gotta say, there's something so... relaxing about having your diaper changed for you."

"Uh-huh. And Mommy doesn't care if you're wet or messy!" Twilight proclaimed. "Mommy's there to clean you up and make you feel better, like all mommies do."

Celestia smiled and beamed with pride. "Oh, Twily, it warms my heart to know you think so highly of me. You're the best little foal I could've asked for."

Spitfire, meanwhile, plopped onto her padded rump. She delighted in the faint wisps of foal powder that billowed out from the leg holes, and the infantile scent of cornstarch that tickled her nostril as a result. For a moment, she was content to just sit there and be lost in her thoughts. But after the moment passed, she looked to her fellow padded pony and asked her. "So, what do you wanna do, pr... er, Twily?" She blinked slowly. "That's gonna take some getting used to."

Twilight giggled. "It's okay, Spity. I'm sure you'll get the hang of it eventually. Just do what I do," Then she put a hoof to her chin. "But actually, I don't really know what I wanna do today."

Princess Celestia then proposed. "Well, why don't I make a suggestion? After all, I got the day off so I could spend it with you, Twily. I don't want anything to get in the way of our playtime. And I most certainly couldn't take you to court with me. What would all the nobles think?"

Twilight stuck out her tongue in playful fashion. "They're just a bunch of big poopie heads. They don't like to have any fun at all! They're not like you, Mommy."

The sun princess seemed to struggle to suppress a smirk. "Even so, I don't think you'd want them all to know your secret, Twily. Better if we keep it to ourselves and to your playmates," She then suggested. "Now, why don't we all do something fun together? We can all play train: You, Spity, myself, and even Smarty Pants if she wants to join in."

The padded alicorn excitedly puffed out her wings! "Oh yes! Choo-choo train is fun! Let's play that!"

Spitfire pondered for a moment, then said. "Train sounds fine to me. I do like a little bit of pretend every now and then."

"How 'bout you, Smarty Pants?" Twilight asked the doll. "Do you wanna play too?"

Smarty Pants was quick to reply. "Oh, you know I do, Twily! I always want to play with you and have fun with you no matter what!"

"Splendid!" Princess Celestia clapped her hooves in approval. "Now let's all form a line and get our choo-choo train rolling," Then she suggested. "Spity, why don't you lead? You can be the engine that pulls the rest of the train behind it."

Spitfire was taken aback by the suggestion. "Me? Are you sure that's a good idea, Princess? I'm only just getting used to the idea of being a big foal."

Twilight happily encouraged. "I know you'll do a great job, Spity! Just close your eyes and pretend to be a choo-choo train. Mommy, Smarty Pants and I will follow you." She proceeded to stand directly behind Princess Celestia, and placed Smarty Pants atop her head so that the doll would be just slightly ahead of the padded alicorn.

The padded pegasus, however, just stood there in silence. She was hesitant to say or do anything. This was very much uncharted territory for her. What if she didn't do it right?

"Come on, Spity!" Twilight cheerfully called. "The train's ready to leave!" And she pretended to blow a whistle. "Choo choo!"

"Choo choo!" Celestia chimed in, mimicking Twilight's call.

Shutting her eyes and taking a deep breath, Spitfire tried to let go. She tried to picture herself not as a fearless Wonderbolt, but as a train on a railroad track, as the very locomotive at the front that pulled everything else behind it. In a way, it was not unlike her aerial performances with the Wonderbolts. The only difference is that this was for a private audience, which consisted entirely of the ponies behind her.

Steadying herself, the pegasus pony with a gold coat took a few steps forward. She was used to the extra weight of a diaper, though always when its crinkles were muffled beneath her flight suit. She quickly began shouting to drown out the infantile sound. "Choo choo!" She said in the most childish voice she could muster up (which didn't sound very convincing in her mind).

"Choo choo!" Celestia replied as she followed behind Spitfire as the ponies began parading around the room.

"Choo choo!" Smarty Pants and Twilight joined in, repeating the phrase every minute or so.

Of course, just saying "Choo choo" over and over again got tiring very quickly to Spitfire. So she tried to mix it up a bit by saying. "Chugga chugga."

Pretty soon, an alternating chorus of "Chugga chugga" and "Choo choo" could be heard echoing throughout the royal suite as Spitfire continued to lead the make believe train. Slowly but surely, as time passed, she found herself slipping more easily into her role. It felt so... liberating to be freed from all of her big pony worries, to just push them all aside and let herself go. She didn't even need to worry about needing the bathroom: She had a perfectly portable potty on her plot that could easily hold anything she might have to do if the need arose.

"This must be what ponies like Princess Twilight long to feel like," The padded pegasus thought to herself even as she continued her session of make believe with the princesses. "Could there be others like her out there somewhere?" Then she gasped as a realization struck her! "Of course! This must be why Princess Celestia had me hoof the reins of captain over to Rainbow Dash. Rainbow Dash must've found out about this too," A faint smirk formed on her face. "Oh, I am so gonna enjoy teasing her about this the next time I see her!"

Eventually, amidst the alternating chants of "Chugga chugga" and "Choo choo", the faintest of rumblings could be heard. It was coming from Spitfire's stomach, which caused the padded pegasus pony to slow right down to a standstill.

"What's the matter, Spity?" Twilight asked as she poked her head out from behind Princess Celestia. "Are you feeling okay?"

Spitfire slowly replied. "Uh, now that I think about it, it's been quite a long time since I had anything to eat. I usually don't like to eat big meals before a show. It's kind of related to how I got my embarrassing nickname, and why I started making all the Wonderbolts wear diapers for long shows," Her face blushed bright red. "Could've been worse, could've had it happen while my mom was in the crowd. Oh, I don't know if I'd ever live it down if she had seen that."

Smarty Pants chuckled. "Oh goodness, that must've been quite a mess: Just like the time Twily got into some chocolate pudding."

"Smarty Pants!" Twilight playfully whined. "You don't have to always tell everypony embarrassing stories about me! How would you like it if I told everypony embarrassing stories about you?"

"Gee, I'm sorry, Twily," Smarty Pants sincerely apologized. "I just get carried away sometimes. You're still my best friend, you know."

"Yes, I know," Twilight nodded, right before her own stomach started to grumble. "But now I'm hungry too."

"Well then, I guess that means it's time for lunch, my little ponies," Celestia cooed. "Delicious num-nums will get you fueled up for more playtime together," Then she trotted towards Spitfire. "But first, I believe diaper checks are in order."

Spitfire eeped as her padding was pulled back by the sun princess. "Why are you doing this? I'm pretty sure I'd know if I did anything in my diaper."

"Foals don't always know when they have to go or if they've done anything," The sun princess explained with a wink. "But you're dry, Spity. So just give me a moment to check on Twily, and then we'll get you both fed, okay?"

"Okay." Spitfire slowly nodded and sat down, waiting patiently.

Twilight proudly presented her padded posture to the elder alicorn as she approached, and didn't flinch when it was pulled back for a closer inspection.

"Seems you're a little bit wet, Twily," Princess Celestia commented. "We should get you changed. Unless, you'd like to try to use the potty again."

The padded alicorn shook her head from side to side. "Nah. I'm good, Mommy."

"Okay then," The sun princess agreed while using her magic to lift Twilight into the air. "Let's get you changed before you get a rash." And quick as a flash, she levitated her fellow alicorn over to the changing table and performed a diaper change.

Once Twilight was in a fresh, powdered diaper, she and Spitfire waddled after Princess Celestia as she ushered them to either side of her.

"Stay close to me, my little ponies," Celestia instructed, before lighting up her horn. She proceeded to teleport herself and the two padded ponies in her care to the royal dining room, which was currently unoccupied. "Okay. Everypony get comfortable, and I'll see what delicious num-nums are on the menu for today." She levitated over two bibs, tying them around the necks of both Twilight and Spitfire, then disappeared into the kitchen at the other end of the room.

Spitfire sat across from Twilight at the dining room table, which gave her an uninterrupted view of the padded princess poking at her padding with a hoof. Twilight clearly delighted in such a foalish act. Meanwhile, Spitfire was adjusting to the fact that her rear seemed to be sinking further into the padding. Her own diapers had always been thick and absorbent, but Twilight's diapers seemed to be even thicker (and probably even more absorbent). "Where does Princess Celestia... I mean your mommy get your diapers from, Twily?" Spitfire saw fit to ask at last.

The padded alicorn chuckled, not even looking up from where her hooves were. "I don't know. She must get them from somewhere special, though." And she went back to poking at her padding, making it crinkle and compress.

The off-duty Wonderbolt couldn't help but wonder what was so enjoyable about that. It didn't seem like it was anything worth taking pleasure in. Fortunately, her thoughts were soon distracted when Princess Celestia returned. Held within the glow of the sun princess' horn were several jars of different flavored foal foods, and plastic spoons. "Lunch is served, my little ponies!" She declared with a coo.

Spitfire watched with hesitation as the lids of the jars were unscrewed and removed, and the plastic spoons were dipped into the various colored goops. They didn't look appetizing at all. She usually wasn't picky about what she ate, so long as she wasn't eating right before or just after a show or a long flight (her stomach needed time to adjust). But this looked like it would be the rare exception.

Twilight seemed to harbor no such beliefs about the foal food. When spoons with the various foal foods were presented to her, she happily opened her mouth and let her fellow alicorn deposit the spoon's contents onto her mouth. Then, much to the padded pegasus' surprise, she watched as Twilight latched onto one of Celestia's exposed teats and began to suckle on it.

Princess Celestia's response was even more shocking than the act of Twilight nursing from her teats. She just drapped a wing over herself so as to give Twilight some privacy, until finally the padded alicorn decided she'd had enough breast milk and let go of the teat. Then she allowed herself to be burped by the sun princess, letting out a belch that would've made a dragon blush.

Spitfire knew what was coming next, and she squirmed about in her seat as she tried to get away. "Can't I have something else, please?" She pleaded with the taller, older alicorn.

Celestia simply replied in a motherly tone of voice. "Now Spity, you have to eat your num-nums if you want to grow up big and strong. This is all you're getting today, and I expect you to eat every last drop."

"But... but..." Spitfire stuttered.

"-Ah ah, no buts." Celestia motherly scolded, then presented one of the plastic spoons to Spitfire.

Hesitantly, the off-duty Wonderbolt opened her mouth and shut her eyes. She expected to gag on the foul taste, but was surprised instead by how sweet and delicious the deposited foal food tasted. It easily put Rainbow Dash's academy cooking to shame (not that that was saying much given how poorly Rainbow's first attempt had gone).

Princess Celestia smiled. "See? There's no need to make a fuss, Spity. It's good for you."

The padded pegasus didn't protest any further as the rest of the foal food was fed to her. The only thing that would make it better was if she had something to wash it down with. Imagine her surprise when she saw Celestia standing before her with an exposed teat.

"Go on, drink up." The sun princess encouraged.

"You sure you want me to, princess?" Spitfire asked as her face flushed red.

Celestia nodded. "Just don't drink too fast. You needn't worry, I have lactating pills so I can always have milk for when it's needed."

So Spitfire latched onto the teat and slowly suckled. She was almost overwhelmed by the warm, rich, creamy taste that soon reached her tongue! She only vaguely recalled the times her own mother had breastfeed her as a foal. Oh how long ago those memories appeared to be now. How long had it been? Two decades? Maybe three? At the time, Spitfire felt she had grown up at a fairly reasonable age. But now she was beginning to think that maybe she hadn't fully enjoyed her foalhood as much as she should've. To say nothing of how little time she'd spent with her mother as of late.

A faint yet steady hissing sound snapped the padded pegasus out of her pondering. She looked down at her diaper to see it fast swelling up as her bladder emptied itself. That breast milk had gone right through her!

"Oh, goodness!" Princess Celestia chuckled. "Twily does that too, sometimes."

"I do not!" Twilight playfully whined anew.

Spitfire, meanwhile, just sheepishly replied. "Sorry, princess. I didn't mean to do that."

The sun princess waved a hoof. "Oh, it's quite alright. That's why you're wearing a diaper," She then offered. "Would you like a change before we resume your playtime with Twily?"

The off-duty Wonderbolt looked down at her diaper, seeing the wet spots slowly fading as the padding soaked up her accident like a sponge. The damp feeling also wasn't that bad, at least for right now. So she said with a tone of indifference. "Nah, I'm good. These diapers look like they can hold a lot more than that!"

"Oh they most certainly can. I'm so jealous of the fact that you and Twily get to wear those diapers and I don't." Smarty Pants commented.

"Hey, if you like 'em so much, why don't you put one on, Smarty Pants?" Spitfire proposed. "I'm sure they could fit you with a little bit of adjusting."

Princess Celestia smiled. "I think that's a great idea, Spity. When we get back to Twily's room, I'll see about modifying one of Twily's diapers and putting it on Smarty Pants. Then you can all play together."

Sure enough, when Celestia brought Twilight, Spitfire and Smarty Pants back to the royal suite, she immediately used her magic to grab one of the thick diapers from Twilight's stash. Focusing her horn on the padded undergarment, she soon had it shrunk down until it was small enough for Twilight to slip it onto Smarty Pants.

Smarty Pants cheered! "Yay! I actually get to wear diapers instead of having them made for me! Thank you, Spity!"

Twilight beamed with delight. "Yes, thanks a bunch, Spity. You're the best, really!"

Spitfire waved a hoof, shrugging off the compliment. "Eh, it's no biggie. I just figured Mommy could do something nice for you too."

"Still, I can't thank you enough for your idea!" Smarty Pants happily proclaimed as she hugged Spitfire. "I think you're the best playmate for Twily in a long time. And I'm not just saying that because you helped get me into diapers."

"Well, don't thank me yet," The off-duty Wonderbolt replied. "Because now I wanna play something much more fun than choo-choo train, and that was a lot of fun."

"Really? What is it?" Smarty Pants asked the padded pegasus.

With a grin, Spitfire playfully lunged at Twilight and proclaimed. "Diaper wrestling, of course! First pony to pin the other underneath their padded rump wins. Trust me, this is the best!"

"You're on, Spity!" Twilight playfully replied as she began to tussle with her fellow padded pony. "I'm not gonna lose to you!"

The padded pegasus giggled as she rolled around, trying to avoid Twilight's efforts to roll her over and sit on top of her. "You can't beat me at diaper wrestling! You can't beat me at anything, period! I never lose! Now come on! Show me whatcha got!"

The two padded ponies thus tumbled and rolled about, paying little attention to anything else as they both tried to overtake the other and plop their padded plot firmly onto their opponent.

Princess Celestia initially watched the play fight with a motherly smile. But when she saw the two padded ponies drawing near to the princess sized bed, she immediately began to worry and gasped! "Look out!" She rushed forward, hoping to stop the fight before it was too late.

Alas, Spitfire made one swift motion and thrust herself hard at the padded princess. "I've got you now!" She boasted.

The resulting motion from the padded pegasus propelled Twilight backward. With an audible thump, her backside struck the foot of the bed. Immediately, the fighting stopped as Twilight sat up and began to whimper.

The off-duty Wonderbolt was immediately racked with guilt over what her actions had just caused. "Oh geez! I'm so sorry, Twily! Are you okay?! Are you bleeding? Did you break something?" And she began frantically trying to look the alicorn all over for any sign of injury.

However, Celestia ended up taking charge of the situation, lifting Twilight up with her magic and pulling her close for inspection. "It's okay, Twily," She reassured her fellow alicorn with that motherly tone of hers. "Mommy's here."

"Mommy, I got a boo-boo!" Twilight sniffled and sobbed. Sure enough, it was possible to notice a faint bruise mark on her back where it had impacted the bed.

The sun princess gently shushed Twilight, gently calming her down. "There there, Twily. I'll put a bandage on it. Then you'll feel better."

"I'll go get it!" Spitfire insisted, desperate to do something to make up for unintentionally causing her playmate to be injured.

But Princess Celestia took care of the problem before Spitfire could do much of anything. A smiley faced bandage a bright pink in color was soon levitated over the bruise, covering it completely. Then, carefully, Celestia set Twilight back down.

"I'm really sorry about that, Mommy," The off-duty Wonderbolt sincerely apologized, before turning her attention to Twily. "I didn't mean to play so rough with you, Twily. I forgot that whenever I did stuff like that as a foal, it was always outside. My mom would make me do it there so I wouldn't break anything or get hurt. And if I ever did get hurt, she would always be there to kiss my boo-boos and make me feel better."

"Sounds like your mommy was just as sweet as Twily's mommy is." Smarty Pants commented.

Spitfire nodded quite slowly. "Yeah, she was," A lone tear came into her eyes. "I really haven't seen her in so long. Things have been so busy with the Wonderbolts these past few years. It feels like I barely ever have time for myself anymore. This was my first day off in I don't even know how long."

Twilight slowly waddled over, nuzzling her fellow padded pony in the side. "Well, I'm sure you can find time to see your mommy now that you're no longer captain," Then she declared. "But maybe I should pick the next game we play. A game where nopony has to get hurt."

The rest of the day was a fun filled blur for Spitfire, as she passed the time playing all sorts of fun games with Twilight (including a game of house in which Spitfire was the unlucky pony to be saddled with the role of "Baby", resulting in far too many diaper changes that she was on the receiving end of). She wasn't sure this had fully cured her trouble with children, but the off-duty Wonderbolt was nevertheless convinced it was a step in the right direction at the very least.

When at last the playtime came to an end, Spitfire grabbed her flight suit and hastily put it back on. As she did so, she thought something was off from the way it felt. She quickly dismissed it, she could worry about that at a later time.

So exhausted was the pegasus pony that she only barely made it back to her own royal suite that she was staying in, falling asleep almost as soon as she had crawled into bed.

Next morning, when the off-duty Wonderbolt woke up, the first thing she noticed was a letter sitting on a stand near her bed. She sat up to get a closer look and read it, and as she did so she thought she felt something squish underneath her. But she could worry about that later, the letter seemed important. It was short and read as follows:

Dear Spitfire,

I don't want you to think you're in any trouble for what happened with Twily yesterday. She's fine, and I know you didn't mean to cause her to get hurt. Hopefully, the incident has taught you to be more delicate with foals, either others or your own if you ever have any.

That aside, you were a great playmate for Twily. I know she appreciated having somepony exactly on her level that could play with her. And Smarty Pants told me to tell you thanks for your idea about putting her in diapers, she really enjoyed it and is already looking forward to doing it again.

For somepony who told me she wasn't all that good with kids, you seemed to do a good job interacting with Twily. As a way of thanking you for what you did, I arranged a little something that I'm sure you'll appreciate.

Yours truly,

Princess Celestia

Spitfire had no sooner finished reading the letter when the door to her suite swung open. In strolled her mother, Stormy Flare. And was it Spitfire's imagination, or did her mother's eyes seem to be drawn to something?

Stormy Flare seemed to have a motherly smile on her face as she approached the bed her daughter was in, pulling back the sheets to be greeted with the sight of a very wet diaper. "My goodness, Spitfire!" She seemed to tease. "I thought you were potty trained."

At that the off-duty Wonderbolt gasped! Only now did it dawn on her that she hadn't changed out of her diaper last night, let alone used the bathroom. "M-mother," She whimpered in shame. "I...it's... not what you think. I just..."

Stormy Flare only made a tsking motion with one of her hooves. "It's a good thing Princess Celestia brought me here today. She said she had just the thing to make me feel young again. And this certainly makes me feel young. Why, I haven't changed your diaper since you were four."

"Mom!" Spitfire whined as the shame washed over her.