Author's Note

To my knowledge, this is the first ever padded pony fic where Twilight Velvet is a foal and not a caretaker. To celebrate that, here is a picture of Velvet in diapers:

Anyway, I decided to go with the headcanon from Blown Together: a Night Light & Twilight Velvet Adventure in that Velvet is a former student of Princess Celestia. I also drew a little bit on inspiration from FabulousDivaRarity, who wrote a lot of headcanon stories involving Twilight Velvet and Shining Armor, particularly on the inspiration that Velvet breastfed her children even after they were old enough to no longer require it.

Since no one proposed any ideas for what Velvet could do with Twilight, I decided to draw on the popular headcanon of Velvet being a writer, as well as her canonical personality of being a thrill seeker. Two of the books read here are references to other padded pony works I've been part of, one now defunct.

Now, in light of the votes that have been received so far, here's what I'm going to do for the next chapter. First, I'm going to list all the characters ineligable for the fic under any circumstances, then list the ones that cannot be done solo anymore. After that, I'll list the characters who have received votes in rounds prior. Spitfire will get two half votes, equaling one full vote. But if she ties with any character not on the list, that character will have priority.

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

Characters previously voted on:
Spitfire - One vote
Lightning Dust - Half a vote
Moondancer - Half a vote
Cheerilee - Half a vote
Maud Pie - Half a vote

As always, feel free to not only suggest characters to be playmates for Twily, but also what they can do with her. But keep it SFW, nothing sexual.

Big Sis Velvet (Twilight Velvet)

Twilight's next playmate came as quite a shock to the padded alicorn in more ways than one. The first shock was when Princess Celestia took the liberty of waking her charge, and introducing the playmate directly. All the while, Celestia maintained that motherly smile of hers as she checked Twilight's diaper, finding it dry. "I hope you don't mind, Twily," Her smile grew brighter. "I have a feeling you'll recognize the pony I brought here to be your playmate today. She practically begged me to let her play with you after she found out that your big brother also got to play with you."

A gasp escaped Twilight's mouth! "You mean...?!"

Nodding, the sun princess stood aside, and from behind her trotted a very familiar unicorn mare with a snow white coat. Her mane and tail consisted of snow white locks and very light purple streaks in the same skunk stripes as the pink one in Twilight's mane. And of course, said mare was clad in an overly thick, poofy diaper that hugged her rear tightly. Waddling forward in a somewhat clumsy fashion, the mare cleared her throat and smiled. "Hello, Twily! Surprised to see me?!"

The padded alicorn's jaw dropped wide open in disbelief! "Mommy Twilight?!" She exclaimed in profound surprise! Was this all a dream despite how real it felt? Never in her wildest imagination had she given any thought to having either of her parents not only find out about her secret, but also partake in it with her.

Twilight Velvet happily nodded, then giggled. "Yes, it's me. Although, since Princess Celestia is already your mommy here, I'm really more of a big sister to you: Big Sis Velvet," A blush formed on her cheeks. "Gosh, it feels so... strange to see you back in diapers. I remember how, compared to Shining Armor, you took to potty training so well. You were out of diapers before I stopped breastfeeding you."

"H-how... how is this possible?!" Twilight stuttered in disbelief! She didn't know what else to say, or even what she could say.

Velvet smiled "It's really quite simple, Twily. You're okay with me calling you that, right? I know you used to find that name so embarrassing whenever Shining Armor or Cadence would use it," Then she coughed into a hoof, before flashing a knowing wink at Princess Celestia. "Anyway, Princess Celestia already kept me informed of your little secret from the moment she found out about it. She was so worried about being your mommy, she wanted to make sure I wouldn't be jealous. Fortunately, I was more than happy to let her baby you to her heart's content. I even let her borrow my lactating pills that I kept just in case of an emergency."

Princess Celestia then added. "Velvet and I were already pen pals. She was once my student the same way you were, Twily. You were a lot like her, actually, aside from the fact that you weren't quite as adventure loving as she was and still is. And it seems that thrill seeking nature led her to ask that I let her be your new playmate," Giggling and trying to suppress a smirk, she went on to say. "Even if it means she goes back to diapers. Luckily, your diapers fit her pretty well. With a little bit of magical adjusting to fit her size and weight, of course."

Velvet proceeded to poke at her padding with a hoof, delighting in the crinkles it gave off as it compressed. "I needed a break from my writing desk anyway. I've been struggling to think of how to end my latest novel. And this seemed like the perfect distraction," Then she asked. "Now, are you gonna introduce me to Smarty Pants? I know how attached you two are. And any friend of yours, Twily, is a friend of mine."

The young, padded alicorn nodded quite slowly, still trying to process the idea of her female parent playing the role of a big sister. It was a lot to take in on short notice. Nevertheless, she trotted over to her bed and grabbed Smarty Pants from her resting place next to the pillow at the head of the bed. "Hey, Smarty Pants," She said to the old doll. "You'll never guess who Mommy got as my next playmate. It's my other mommy, the one who was my mommy before Princess Celestia became my mommy."

"Hello, Mommy Twilight," Smarty Pants greeted in that exaggerated tone of voice that made it so easy to tell it was really Twilight speaking. "I didn't know a pony could have two mommies, or that mommies and daddies wore diapers. Twily's mommy never wears them, she uses the potty."

Velvet couldn't help but snicker. "Well, I'm not Mommy Twilight today. Twily already has a mommy, but she doesn't have a big sister. You can call me big sis Velvet, or big sissy. After all, I'm wearing diapers too." She promptly and proudly showed off her poofy, padded posture, patting it with a hoof.

Smarty Pants commented. "Hey, aren't those Twily's diapers? You should've asked, I'm sure Twily wouldn't mind sharing them."

Velvet blushed. "Sorry. I was just so excited about the chance to play with Twily that I guess I forgot about asking. But her mommy said it was okay."

Twilight then replied. "It's okay, Smarty Pants. My mommy buys me plenty of diapers. I don't mind sharing a few with big sissy. Diapers are better than the potty anyway."

"Oh yes, definitely." Smarty Pants agreed.

"Oh come now, Twily," Velvet encouraged. "I'm sure you'd get to like the potty if you just gave it a chance."

But the sun princess waved a hoof. "Oh, it's okay. I don't mind changing Twily, no matter how stinky she gets. If she doesn't want to potty train, she doesn't have to. Mommy wants what's best for her little filly."

"Exactly!" Twilight beamed, hugging her fellow alicorn. "You're the best mommy ever, Mommy!" Then, with a blush, she turned to Velvet and said to her "other mommy". "No offense."

The elder Twilight shrugged off the remark with indifference. "None taken."

Smarty Pants then asked. "So, what should we do first... Mo... er big sis?"

The elder alicorn with a majestic white coat quickly proposed. "Well, what about story time? We've never done that before, have we, Twily?"

Velvet pouted. "Aw, that's no fun. I wanna explore the castle! I might not get another chance like this for a really long time."

Twilight seemed to be intrigued by the idea proposed by the padded unicorn. "Yeah! We should explore the castle with Mommy! It'll be like an adventure!"

Princess Celestia rejected the idea. "Maybe later, my little ponies. I don't want either of you getting into trouble."

"We wouldn't cause trouble. We'd be good, wouldn't we, Twily?" The elder Twilight suggested.

Twilight firmly nodded. "Yeah. I'd even use the potty if you wanted me to, Mommy. If I did that, would you let us explore the castle with you?"

Celestia again shot down the idea. "I wouldn't want any of the castle staff to get the wrong idea about you, Twily. I would first have to make sure none of them promised to tell anypony about it, and that there are no visiting delegates or other important ponies who might see you. For right now, you and your big sis will stay here and listen to the stories I'm going to read you. If either of you wants to use the potty, you can. But only if I'm there to supervise you." And with that, she used her magic to pull out a small table and some chairs, along with a stack of books that looked surprisingly foalish in design and cover.

"Guess we'll just have to wait another time to go exploring. But that's okay, we can still have fun here." Smarty Pants commented.

"Yeah, I guess so. Reading can be a great way to escape from reality," Velvet declared. "I know how much you loved the stories I used to read to you, Twily. It's always a good idea to inspire a love of reading and learning at a young age," And she chuckled. "You were so smart you practically ran your potty train all on your own. I barely had to do anything," She paused and wiped a tear from her eyes. "Sorry, I'm getting sentimental. Guess seeing you in diapers really brings back memories."

Twilight simply nodded back in silent approval, then joined Velvet as the two padded ponies promptly planted their poofy, padded postures onto the seats. Smarty Pants was seated off to the younger Twilight's left, while Princess Celestia took up a seat at the opposite end of the table. Much to the surprise of both Twilights, they found small paper plates filled with food, and sippy cups filled with apple juice.

The sun princess flashed a motherly smile. "Before we start reading, how about my little ponies have a snack? Baby carrots and applesauce. And if you both behave, I'll let you have freshly baked cookies for dessert."

"Oh boy, cookies!" Twilight eagerly exclaimed as she licked her lips in anticipation!

Velvet, meanwhile, commented. "Baby carrots have always been Shining Armor's favorite. I should make them for him the next time he comes home for a visit."

The two Twilights greedily devoured their snacks, scarfing down the baby carrots and applesauce even as they got traces of said applesauce all over themselves.

Rather than frown upon the lack of table manners displayed by the little ones, the elder alicorn just smiled that motherly smile of hers before levitating over a wet rag. "Goodness, you two must've been hungry!"

Velvet nodded and grinned. "We sure were. I didn't even realize how hungry I was until I started eating the baby carrots."

"Well, I hope you two have room for dessert," Princess Celestia declared as she levitated over a much larger plate. "A deal's a deal, here are your cookies."

Smarty Pants let out a sigh of regret. "I wish I could enjoy food like baby carrots and cookies. But I can't. I'd just make a mess."

"Hey, don't feel bad," Twilight said to the old doll. "You can do all kinds of things that I can't. You could sit on a potty made of Legos without getting hurt. I could never do something like that."

Velvet chimed in with her own sentiments. "I remember how much Twily used to toss you around and bang you against things like you were a drum, Smarty Pants. But you never complained once, and you held up really well despite all the punishment you took. And I haven't forgotten how you used to sing to Twily whenever she was on the potty, helping her tinkle."

"Big sis!" The padded alicorn playfully whined.

The padded unicorn just chuckled. "I was just trying to cheer up Smarty Pants the way you were, Twily," Then she apologized. "I'm sorry if I embarrassed you in front of Mommy."

Celestia sweetly replied. "It's alright, I don't think any less of Twily for that. It just tells me that Smarty Pants was the first friend Twily ever had, long before she had the courage to make other friends. And it warms my heart to know that, even from a young age, she could appreciate the magic of friendship and experience its wonders first hoof."

"Enough chit chat!" Twilight eagerly declared as she reached out a hoof to the plate of cookies! "I want cookies!"

The sun princess, however, gently yet firmly swatted Twilight's hoof away. "Now now, Twily. You mustn't touch that plate. Those cookies are hot. You could burn your hoof and get an owie. We wouldn't want that, would we?"

The padded alicorn seemed to whimper in reply. "No we wouldn't. Owies are no fun."

"Exactly!" Princess Celestia declared as she lit up her horn. "I will put the cookies on plates for the both of you. But let them cool off for a minute or two first. You should never touch or put anything in your mouth that is hot. Not unless you want to see how ouchie burns can be."

So both Twilights reluctantly waited as the steaming hot cookies tempted them, the aroma wafting through the air and tickling their noses. At last, however, they were given the encouraging nod from the sun princess. And together, elder and younger Twilight devoured the cookies on their plates in record time. After which, the two padded ponies leaned back in their chairs, letting out hearty belches.

Celestia once more cleaned her charges' faces, then set the plates aside for washing later. Then, she rose from the table and motioned for the padded ponies to do the same. Soon afterward, the non-padded alicorn sat down and brought the stack of books over. "Alright," She cleared her throat. "Which book should we read first: The Legend of Gusty the Great?" She floated over a violet red colored book that depicted a greenish-gray unicorn mare. "Goldiehoof and The Three Ursas?" Next to be floated over was a bright red colored depicting an earth pony filly with curly gold locks, two ursa majors, and an ursa minor. "Daring Do and the Temple Toilet?" This book was the same green as the first Daring Do book, but depicted a filly Daring Do sitting on a giant toilet. "Captain Padding v.s. The Potty Monster?"

Velvet let out a gasp! "Hey, that's one of my books! I was inspired to write it during Shining Armor's potty training the first time he tried to go potty all by himself. I had to change names and change some of the details, but the inspiration just struck me."

"Wow!" Smarty Pants exclaimed with amazement! "Did you ever write any books about Twily when she was a foal?"

Velvet firmly nodded. "I most certainly did. One of them even helped me win the coveted Daring Do Award."

Princess Celestia chuckled. "Oh, I had no idea you wrote such books, Velvet. I guess it's settled, then," She floated over a dark blue book depicting a toddler unicorn colt that looked suspiciously similar to Shining Armor. "I'll read Captain Padding v.s. The Potty Monster first," Using her magic, she opened up the book and cleared her throat, beginning to speak in an exaggerated tone of voice. "This is a story about how Captain Padding battled and triumphed over his greatest nemesis: The Potty Monster, a monster that prayed on innocent colts and fillies trying to be big kids."

"And so, with the vicious Potty Monster vanquished forever, Captain Padding had made the bathroom safe for colts and fillies of all ages," Princess Celestia spoke as she finished reading the book. "And in the process, he himself had proven that he was more than worthy to wear his big pony pants. From that forward, he was Captain Padding no longer. He was now Captain Pull-ups. The end."

Both Twilights clapped their hooves, signaling their praise and approval of the story as they sat upon the floor.

Celestia then levitated over a book that she knew the younger Twilight had always regarded as one of her favorites: The Legend of Gusty the Great. Soon, she had opened it up to the first page and begun to read it. As she did so, she could see both Twilight and Velvet shifting about on their diapers from time to time, trying to get as comfortable as they could. It warmed her heart to see Twilight getting along and playing along so well with her first mommy. And Twilight Velvet seemed to be taking to the role of "big sister" very well, as if she'd done it all before.

Compared to Captain Padding v.s. The Potty Monster, The Legend of Gusty the Great was full of "big words" that the sun princess had to pause and explain to Twilight and Velvet what they meant. Yet she could still easily judge how much they loved the story from the way they were sitting and staring up at her, their eyes conveying that she had their full and undivided attention.

At last, Princess Celestia finished the story, reading aloud. "Thus did Gusty the Great pave the way for the land of Equestria to come into existence. With Grogar, the father of monsters defeated and sealed away within his bewitching bell, he would never again threaten or terrorize anyone ever again. And Gusty the Great and the ponies lived happily ever after."

"Wow! That was even better than Mo... er big sis' story!" Smarty Pants commented in amazement. "Gusty the Great sounds like a really brave pony, even braver than Shining Armor or Princess Celestia!"

"When I grow up, I wanna be just like Gusty the Great!" Twilight proclaimed in an exaggerated tone of voice as she puffed out her chest and stood up! "I'm not gonna be afraid of anyone or anything! I'll go on death-defying adventures with friends, right wrongs, and triumph over evil!" Yet she then lost her balance and fell backward, causing her padded rump to crinkle and squish underneath her.

Hearing that squish immediately prompted Celestia to get up from the chair she had been sitting in. She sniffed the air as she trotted over towards Twilight, eyeing her diaper with a trained eye. A closer inspection revealed that it was visibly soaked, and had been for some time. "Twily, why didn't you tell me you'd pee-peed yourself?" She scolded in that motherly tone of hers. "You could've gotten a rash."

Twilight's face flushed red with embarrassment. "Sorry, Mommy," She sincerely apologized as she felt herself be levitated into the air in front of Velvet and Smarty Pants. "I was just focusing on the story and all those voices you were using. I guess I didn't realize I went potty."

Princess Celestia just sweetly smiled as she levitated her fellow alicorn onto the changing table. "Well, I guess it's a good thing you gave yourself away with that squish. But next time, if you feel like you need a change, just say something. Story time or playtime can always be paused for diaper changes. We always want to change as soon as possible to avoid rashes." With trained precision, she swiftly undid Twilight's soggy old diaper and removed it, tossing it into the trash. Then she levitated over some wet wipes, sprinkled in some foal powder, and as a precaution worked in some rash cream. After that, she fastened a new diaper to Twilight's rump and then helped her charge down from the changing table.

"Thank you for changing me, Mommy," Twilight hugged the older alicorn anew. "Sorry I didn't tell you sooner, maybe we could've tried to get me on the potty."

"It's alright, Twily. I want you to do whatever makes you feel comfortable and cared for," The sun princess sweetly replied. "If you prefer your diapers to the potty, I won't force you to give them up," But as the two alicorns made their way back to Velvet's location, the smell Princess Celestia had smelled returned anew. "Hm, now that's odd. I thought the smell was coming from you, Twily. Did you toot?"

The padded alicorn shook her head from side to side. "No, Mommy, I didn't toot."

Celestia quickly realized that such a statement could mean only one thing. And sure enough, when she inspected Velvet's diaper, she could tell that the stench was emanating from there.

Smarty Pants giggled and teased. "Big sis made a poo-poo!"

"Smarty Pants, that's not nice!" Twilight scolded the doll. "You don't make fun of me when I go poopy! Mo... er big sis couldn't help it."

Velvet nodded, apparently not bothered by the strong smell wafting through the air. "Yeah. Besides, even big sisters have accidents from time to time," Then she looked up at Princess Celestia. "Sorry I didn't say anything sooner. I didn't want to be a burden."

The sun princess just replied by lifting her former student into the air not unlike the way she had carried Twilight earlier. "Well, you've most definitely earned a change, you stinky filly!" She playfully teased! "Goodness! You're just as stinky as Twily! It must run in the family or something!"

"I guess so." Velvet sheepishly admitted as she watched Twilight and Smarty Pants turn their heads so as to give her some much needed privacy. It was truly a surreal experience for her to have her dirty diaper be changed by the princess. But at least it did make her feel young again.

Luckily for everyone, Princess Celestia was just as swift at changing Velvet as she was at changing Twilight. In no time at all, she had gotten the unicorn changed into a fresh, clean diaper. The old, dirty diaper was tossed into the trash and then bagged up. And with the flick of a horn, it was teleported away, taking the foul smell with it.

Story time then resumed with no further interruptions, until both Twilights' eyes started to droop. Celestia knew what that meant. She paused in the middle of the book she was reading, inserting a paper stub to serve as a bookmark. Then she set the book down on a pile and got up again. "I think it's time for all good little ponies to take their naps." She motherly cooed to them.

"But... we're not tired." Twilight insisted, before betraying her argument with a yawn.

The elder alicorn simply trotted over, helping both padded ponies to stand. "Oh yes you are. This is not up for argument. Besides, I have some grown-up things I have to get done. So this works out for the both of us: You two will take a nap together, and I'll get all my grown-up things done. Then, when you both wake up, we'll have nothing to interrupt our play time together."

"Okay." Both Twilight and Velvet reluctantly yawned in agreement.

Celestia led both her charges back to Twilight's bed, carefully tucking Twilight and Velvet in together and placing Smarty Pants firmly within Twilight's hooves. Then, she lit up her horn and floated over two baby bottles filled with milk. "This should help you both to go to sleep faster."

Twilight eagerly grabbed a bottle when it was presented to her, wrapping her mouth firmly around its rubber nipple as she began to suckle on it. She was surprised by its rich, creamy taste. "Could it be?" She thought to herself, and slowly turned towards the sun princess. "Mommy?" She asked the non-padded alicorn.

"Yes, Twily?" Princess Celestia sweetly asked in reply.

"Is this... your milk?" The padded alicorn inquired.

Princess Celestia confirmed with a gentle nod. "It most certainly is. I had it prepared this morning. I won't always be there to give it to you directly. This way, you'll always have a part of me close to you no matter what," And she motherly encouraged. "Go on, drink it up. Your big sister has already finished her bottle." Sure enough, if one looked to Velvet, they would see the padded unicorn had drank every last drop of milk in the bottle given to her.

So Twilight turned her full attention back to the bottle given to her, and closed her eyes as she tried to imagine the sound of Celestia's gentle heartbeat. Slowly but surely, she suckled down the milk, yawning as she felt herself grow drowsy. A warm bottle of milk fresh from the sun princess, coupled with a full belly from snack time, was enough to make her nod off.

"Twily, wake up." The gentle, sweet, and playful tone of voice of Velvet called out sometime later.

The padded alicorn slowly opened her eyes, surprised to see Velvet staring right at her from the bed. There didn't seem to be a sign of Princess Celestia anywhere. "Where's Mommy?" She asked as she slowly sat up.

"I don't see her anywhere, Twily." Smarty Pants admitted as she looked around the room.

Velvet smiled. "Sorry for waking you up, Twily. But I just couldn't sleep for very long. I want to play and explore. And this is the best opportunity to do so!"

Twilight gulped and swallowed hard. "But won't we get in trouble if Mommy finds out?" She shuddered as she remembered what had happened the last time she'd disobeyed an order. The punishment was still fresh in her mind.

Velvet flashed a knowing wink. "We won't be gone for long. We'll be back before she ever finds out we're missing. It'll just be our little secret," She seemed to be all but bouncing up and down in excitement! "Come on! Don't you wanna have more fun with your big sister?! Don't you wanna see what kind of cool things we can discover together?! You said you wanted to be like Gusty the Great and have adventures."

Reluctantly, Twilight got up from the bed, tossing aside the sheets as she did so. "Smarty Pants, you stay here!" She told the old doll. "If Mommy comes back," She used her magic to hastily pull the covers back up. "Pretend that we're all still sleeping, and don't tell her where we are."

"Don't worry, Twily," Smarty Pants declared. "I'll cover for you and for big sis. You two have fun on your little adventure together. When you get back, be sure to tell me about it."

Velvet then eagerly grinned from ear to ear, all but racing to the door of the royal suite she and Twilight were in! "Come on, Twily!" She encouraged! "The sooner we leave, the better our chances of getting back before Mommy finds out."

After looking back to the bed to make sure Smarty Pants was well hidden and out of sight, the padded alicorn followed the padded unicorn to the door. Together, they opened it and stepped out into one of the castle's main long and winding hallways.

Where they would go, the padded duo didn't know. And that just made the adventure seem all the more exciting to the ponies.

Yet it wasn't long after wandering around that both Twilights became aware of the sound of hoofsteps in the distance! And it sounded like the hoofsteps were drawing closer!

Twilight let out an eep! "I can't let anypony else see me like this!" She frantically insisted as her eyes darted all about, looking for a place to hide until the danger had passed!

Velvet looked around. Suddenly, her eyes fell upon a lonely broom closet nearby. Grabbing Twilight by the hoof, she whispered in a hushed tone! "In here!"

The two padded ponies promptly ducked into the broom closet, shutting the door behind them as the sound of hoofsteps grew louder still! The broom closet was cramped, cold, and dark, not to mention dusty. Yet it was the only sanctuary both Twilights could think of at a moment's notice. They had to resist the urge to cough or sneeze despite the accumulated dust, fearful of giving away their position as the hoofsteps sounded as if they were passing by right outside the closet.

It was only a few seconds, but to Twilight and Velvet it felt like forever. Yet the sound of the hoofsteps gradually faded away into the distance. Emerging from the closet, both padded mares caught the faintest glimpse of the hoofsteps' source: Two royal guards conducting their patrols, appearing to be chattering to one another. But they were too far away to be heard.

Twilight breathed a sigh of relief. "That was too close!" She said to herself.

Velvet seemed to nod in agreement. "I almost pee-peed myself in fright, I was so scared," And then and there she decided. "You know what, maybe this wasn't such a good idea. We can have plenty of imaginary adventures right in the comfort of the suite. We don't have to go waddling around the castle, looking for trouble."

"Are you sure about that Mo... er big sis?" The padded alicorn asked.

Velvet nodded again, more slowly and reluctantly this time. "Yes, Twily. After all, I don't want you to get into any trouble with your mommy. As a big sister, I have to be responsible. That means putting your needs ahead of mine. Besides," She crossed her legs. "I have to go potty."

"Why not just go in your diaper like I did? You already did a poo-poo in it. Pee-peeing in it shouldn't be any harder." Twilight pointed out.

Velvet just turned and trotted back to the door leading to the royal suite. "Having an accident is one thing. Intentionally using your diaper is another. I'm a big sister, I have to try to make it to the potty whenever I can, even if I'd rather use my diaper." She had soon gotten the door open, and trotted back through it.

The padded alicorn watched as the elder Twilight, once safely back in the suite, made a beeline for the bathroom and shut the door behind her. Soon, there came the sound of rustling and crinkling, followed by the sound of hissing and tinkling echoing into a porcelain bowl.

"Ah, just made it." Velvet sighed in relief. Soon, she had finished peeing. She proceeded to wipe herself, then flush the toilet. But then, it was as if an idea came to her. She didn't get off of the toilet like Twilight had been expecting. Instead, there came the sound of a splash!

A horrified Twilight opened the bathroom door and rushed in! "Big sis!" She cried out as she looked around the bathroom in distress!

Fortunately, Velvet could be seen sitting inside of the toilet bowl. Her discarded diaper lay on the floor immediately in front of the toilet, still fresh, powdered, and pristine. "I'm okay, Twily. I just fell in, that's all." She delivered that line with a wink, suggesting that she hadn't "accidentally" slipped off the seat.

A gulp formed on the padded alicorn's face as she eyed the toilet. "But if you're inside the potty, doesn't that mean you'll go down the drain?"

The unicorn mare flashed a reassuring smile at the alicorn. "No I won't, I'm too big to fit down it. And so are you."

"How can you be so sure?" Twilight asked, still unconvinced.

"Well, why don't we find out together?" Velvet encouraged as she continued to sit in the toilet bowl, letting the water swirl underneath her flanks. "Come on. There's nothing to be scared of. The water's fine. And if we go down the drain, we go down together. Just imagine what an adventure that would be if that happened. But it won't, we'll be just fine. I promise."

Against her better judgment, Twilight approached the toilet. She undid her diaper and let it fall, then she hesitantly climbed over the seat and into the bowl. Between her and Velvet, there was no room at all for anything or anypony else. They just barely could squeeze into the bowl together.

"Ready?" The elder Twilight looked across to her now un-padded daughter, sounding more like somepony about to go on an exciting zip line or barrel drop as opposed to somepony potentially about to be flushed down the toilet.

Swallowing hard and summoning up courage, Twilight nodded back to Velvet. "R-ready as I'll ever be."

Velvet smiled, then surrounded the handle with her magic and forced it down! "Okay, here we go!" The flush cycle soon began, the waters in the toilet bowl underneath the two ponies surging and swirling around them. It felt like something was trying to pull on their tails and drag them down, but it wasn't strong enough to do so. Instead, the waters just swirled and spun around them, then retreated down the drain as the flush cycle ended. The water in the toilet slowly refilled, and the two ponies sitting inside the bowl hadn't moved. They had not gone down the drain.

The padded ponies climbed out of the toilet a moment later and shook themselves dry, before the elder Twilight declared. "See, Twily? I was right. We didn't go down the drain, and we never will. So now you know the potty's nothing to be scared of. You're big enough to have nothing to fear even if you should ever fall in," Then, she turned her attention over to the nearby bathtub, and used her magic to turn on the tap. "Now let's take a bath, just so we don't get sick from being in that toilet water. I'm sure it was clean, but this is just to be safe."

A nice warm bath, even if it was without bubbles, certainly helped Twilight to relax. She had most certainly enjoyed her play time with her "big sister". It reminded her a lot of the play time she and her brother had gotten into before life had inevitably taken them in separate directions.

When the bath had ended, Velvet stepped out of the tub first, stepping onto some pre-placed towels she had levitated over. As she watched her playmate climb out of the tub seconds later, she wrapped towels around the alicorn's body and helped her to dry off. "This has been so much fun, Twily," She said to the alicorn. "You've really helped me to feel young again."

Twilight smiled. "I'm glad I could help. You're an excellent big sister. My B.S.B.F.F.: Big sister best friend forever!"

"Oh, it warms my heart to hear you say that!" Velvet happily exclaimed as she hugged the still towel wrapped younger Twilight. Eyeing the toilet again, she then had an idea. "You know what, Twily? While we're here, why don't we try to get you on the potty? See if maybe you can do a poo-poo in it."

"Are you sure? I don't think I really have to go." Twilight hesitantly replied.

Velvet encouraged in an almost motherly tone of voice. "Come on, Twily. Don't you wanna try to be a big pony like me and like your mommy? If we can do it and Smarty Pants can do it, so can you!"

Sensing how much the elder Twilight really wanted her to at least make an honest attempt, the alicorn reluctantly approached the toilet as the towels were removed from her body. She was still hesitant to sit down on the seat, but managed to will herself to do so.

"Now just relax," Velvet told the younger Twilight. "You don't have to sit for very long. I just want you to try. If you don't do anything, that's okay."

Yet as the still unpadded alicorn sat on the toilet, she suddenly felt a faint urge building up inside of her. She could probably ignore it and wait for it to die down, even knowing that she would have to do it later. But instead, she grunted and started to push as her tail hiked upward. Her face turned red as she continued to push. Since it had been so long since she'd done this in a toilet and not a diaper, her body was fighting against her. Yet she was eventually rewarded for her efforts when she felt something move within her, heard an audible plop and then a splash.

The elder Twilight clapped her hooves in praise! "Way to go, Twily! I knew you could do it!"

The alicorn mare was sure she knew what she had done. Yet she still looked down anyway, and saw that indeed she had gone potty in a toilet. "I... I did it! I went poo-poo in the potty like a big filly!"

"Indeed you did, Twily," The familiar, motherly voice of Princess Celestia declared as the sun princess came trotting into the bathroom. "I'm so proud of you for once again facing your fear head on. And I hope that, now that you've done it once, you can try to do it again. At least once a week if possible, I would like you to try to go potty like a big filly. I don't mind changing you even if you don't, but diapers are expensive. Going potty like a big filly would help make your diapers last longer."

"I guess I can try, Mommy," Twilight agreed, before blushing and asking. "Um, is it okay if I ask you to help me wipe?"

"Certainly, Twily," The elder alicorn agreed, using her magic to do just that. And as she then flushed the toilet, she turned to Velvet and said to her. "Thank you for all your help today, Velvet. You've been an excellent playmate for little Twily."

"Think nothing of it, princess," Velvet waved a hoof. "It was my pleasure."

Twilight Velvet was more than a little bit disappointed when the next day rolled around and she had to go back to work. True, the time away from her writing desk had been memorable and enjoyable. She was now bursting with inspiration, and couldn't wait to put the ideas down on paper!

Yet as the unicorn mare entered her writing studio, ready to sit down and finally finish that novel she had been struggling for months to complete, she was surprised to see a vial containing a purple colored liquid substance. And attached to the vial was a note. Picking up the note with her magic, she examined it carefully. It read:

Dear Twilight Velvet,

Thanks again for agreeing to be diapered and playing the role of Twilight's big sister. I can tell she really enjoyed it, just as much as all the other playmates she's had since I started treating her as my baby. It warms my heart to know that I can confide this in you without fear that you'll be jealous.

Never being able to have foals of my own, it always feels great to be able to treat Twilight as if she were my daughter and treat her like a foal to our hearts' content. None of this would be possible without your support and advice. You are an excellent mother, and I know you'll make an excellent grandmare to Flurry Heart.

Here's a little something to reward you for your efforts. This should definitely help you feel young again, without you needing to go back to diapers.

Sincerely,

Your former teacher,

Princess Celestia

P.S. Thanks again for the lactating pills. They make it so much easier to breastfeed Twily. You're right, she is still very independent despite that. You raised your kids right.

So Twilight Velvet unscrewed the lid of the vial and brought its contents to her lips. Without hesitation, she chugged down the whole thing, drinking every last drop. When she had finished, she felt an odd tingling sensation. And then suddenly, there was a thick puff of smoke!

When the smoke cleared, Velvet saw what she looked like in a mirror. She could hardly believe her eyes! Staring back at her was a much younger version of herself! She had regressed back to the age she had been when, as a filly, she had become a student at Celestia's School for Gifted Unicorns.

The now filly aged Velvet chuckled. Boy would her husband be surprised when he came home and saw her like this.