Spike stood there watching Twilight Sparkle as she ran back and forth. She had a long list of errands to do and now had to look after Flurry for her brother and Cadance. She spent a significant amount of time playing a short game with the foal before cleaning up the mess she made while attempting to feed her. They needed to get moving now. Twilight placed her niece in her baby carriage.
She was rushing about, attempting to get out the door with Flurry Heart and Spike when he asked, “Um, Twilight, wouldn’t it be a good idea to leave a note for Starlight?”
Twilight exclaimed, “Oh my gosh, I totally forgot about Starlight!”
She frantically wrote her a message and placed it on the castle entrance. After that, the three hurried out the door.
Starlight Glimmer slowly opened her eyes as she lay in her bed as she heard birds chirping outside her window. The mare had woken up later than usual as she noticed where the sun was in the sky. She sat up, let out a yawn and stretched her hooves. She trotted out of her room and into the hallway after getting out of bed. Even after living at the castle for some time now, she was still having trouble finding rooms. The unicorn fixed her mane and tail with a hair comb in the nearby bathroom mirror. She noticed that Twilight Sparkle and Spike were nowhere to be found. It was quiet, too quiet. Even for Twilight.
“Where are they?” she wondered.
Starlight wandered the halls for a short while looking for her friend in her usual spots with no results. She then gave up and proceeded downstairs. The mare went into the main entrance hall to go to the kitchen for breakfast. To her surprise, she saw numerous packages of foal diapers and a few containers of mashed peas lying in a heap near the door.
“What the hay is all this?” she asked herself.
She then noticed a folded letter addressed to her on the entry door. The unicorn removed it from the door and unfolded the paper.
She read it aloud, “Dear Starlight, Spike and I have left to run several errands around town. Shining Armor and Princess Cadance are in town to see the art exhibition of Shining’s royal guard friend. As a result, I am foalsitting Flurry Heart for them. Sorry about leaving the diapers all over the place. We will be gone for most of the day. Your friend, Twilight.”
Starlight looked back at the pile of diapers and foal food as she said, “Well, that would certainly explain the random diapers.” She continued going into the kitchen to prepare breakfast.
When Starlight got inside, she opened a cabinet and took out a mug, a bowl and a spoon. She took out a box of Apple-n-Oats cereal. She made herself a cup of hot cocoa. She added some cereal and milk to the bowl. The mare took a seat at the table and began to eat. Her thoughts kept returning to those diaper packages as she ate. She attempted to distract herself by reading a nearby copy of the Ponyville newspaper. Unfortunately, there were a few articles that didn’t help her, like: Foal Rescued from Burning Building, Do Foals Have a Favorite Color, Do Young Fillies Prefer Pink Diapers and etc.
When she was finished with breakfast and cleaned up, she tried to push it away again as she rounded the corner of the main foyer. She stopped in her tracks then glanced back as her gaze was transfixed on the diapers. Starlight could not explain why she had such an attraction to them. Maybe she wanted to feel young again, go back to a simpler time when things were good. It was something she couldn’t deny.
“Be… Besides, there are so many packages, I’m sure they won’t notice if one or two go missing,” she reasoned to herself as her cheeks flushed. “It’s not like little Flurry Heart can go through this many diapers in a day.”
If the foal did go through that many, Starlight would question what it was her parents were feeding her. Starlight tried to reassure and reason with herself that Twilight said she was going to be out all day and there weren’t any meetings set up in the castle today, so no pony should accidentally walk in on her. Starlight, just to be certain, peeked outside the front door to check if any ponies were around then shut the door. She backtracked to the pile on the floor. She levitated two packages with her magic and brought them to her bedroom. Then she zapped the packs with her magic and enlarged them to make the diapers an adult size. Starlight bounced in place, giggling like a filly as she tore open one of them. The strong smell of foal powder hit her nose; it brought back memories from a long time ago.
She smiled as she reminisced saying “Ohhhh…. I have missed that smell.”
She pulled out a fresh, clean diaper and unfolded it on the floor. The diapers themselves were plain white with three pale turquoise wetness indicator stripes down the center and leak guards of the same color on the sides. She was surprised that the diapers weren’t pink and princess themed since Flurry was a princess after all. She took one of Trixie’s tea cups and transformed it into a container of foal powder. Because Starlight was more advanced than Trixie, she didn’t need to say the item she desired out loud. She laid her butt down on the soft padding, then sprinkled on foal powder, pulled her tail through the hole and folded it over herself. She fully enclosed the diaper around her waist by fastening the two tapes on the front.
The diaper rustled as she sat up in it. She got on her hooves. Her hind hooves were spread far apart from one another. They were as far apart as if they had a pillow between them. It was as if a soft cushion hugged her lower body. She was surprised by the thickness it had. The diaper was extremely thick and crinkled with every movement that she made. It felt strange, but also familiar and comforting to her, like a warm hug. It was like she was getting reacquainted with an old friend and it was an old friend that she was glad to meet again. She waddled around a bit before taking another of Trixie’s teacups, visualizing what she wanted and zapping it. A pink and purple pacifier appeared. It was the perfect size for an adult pony’s mouth. She popped the foalish item into her mouth and started to suckle on it. *suckle, suckle, suckle*
“Mmmhhhhh!” she mumbled behind the pacifier.
The mare felt like she was a little filly again. She waddled out of her room with a loud CRINKLE, CRINKLE, CRINKLE and down the hallway. The only sounds in the castle were the crinkling of her diaper, the suckling of her pacifier and her hoof steps.
Starlight entered the library and looked at the vast number of books on the tall shelves. She let out a sigh of disappointment, frowning slightly, her ears lowering, as she glanced around. Despite the numerous books to choose from, she didn’t think any of them would be picture books suitable for young foals. It was at this time that Glimmer was thankful for her friend’s obsession with turning things into teacups, as there were so many throughout the castle. She noticed four teacups sat on the table in the room. She waddled up to the table, then zapped the first cup into a baby bottle and the other three into picture books. She then sat down on the comfy couch. As a little foal, she used to love being read to and hearing bedtime stories from her mom and, yes, even her dad. She suckled on her pacifier as she started to read out loud in a little filly voice.
“Once upon a time…” she said and continued to read.
When she was finished reading the books, Starlight felt the familiar sensation of needing to pee. Her bladder was full from this morning’s breakfast and best of all; she didn’t need to get up to go. She suckled on her pacifier happily as she relaxed herself and sighed softly. After a few short minutes, her ears perked up as she heard the muffled sound of her stream of urine starting. Hiiisssss! She began to feel the diaper sag and the warmth between her hind hooves.
“Ahhhhhh…” she sighed.
She felt her pee stream strengthen as her padding yellowed and sagged more. The hissing got louder and she moaned softly. A few minutes later, the stream slowed until she pushed a few more squirts before it stopped completely. She giggled as she squished her diaper; it was warm and soaked. She stayed in for some time until it had been cold and damp for a while.
Starlight waddled along with a wet, squishing crinkle from her diaper back to her room. Taking another teacup, she transformed it into a pack of wet wipes. She pulled out another diaper to change into and then got an idea, a cute, babyish idea. She used her magic to double the diaper’s thickness. It was now as thick as two Daring Do novels. She lied down and placed a new diaper under the old one. She unfolded her soaked diaper and wiped her marehood clean. Then she rolled the diaper up into a ball and tossed it into the trash. Starlight used her magic to change her trash can into a diaper pail. She sprinkled foal powder on and then wrapped the new diaper around herself until it was nice and snug. She struggled to stand up this time. She fell down a few times, each with a satisfying loud CRINKLE. Now Starlight felt like she was a real foal. She suckled her pacifier. She almost wished that little Flurry Heart had been left in her care instead. Who better for her to play with than another, much bigger baby?
Starlight decided it would be easier to teleport. Her horn glowed and she disappeared in a flash of turquoise sparks. She appeared in the kitchen with sparks of her magic. She waddled over to the refrigerator, opened it and took out a milk carton. She undid her bottle and poured milk into it. She levitated several more of Trixie’s teacups and teleported herself again into the library. She placed the teacups on the floor and transformed them into toy blocks and a baby rattle. She left a few cups on the side.
Starlight plopped onto her butt with a crinkle. She removed her pacifier and popped the bottle in her mouth. She began to rock slowly while suckling the bottle’s nipple. It felt so nice to drink milk this way. The cold milk flowed through the bottle and down her throat. She suckled on it at a moderate pace. She didn’t notice how quickly she was drinking it until she realized she was sucking on an empty bottle.
She giggled and said, “I’m a hungry little baby.”
Glimmer set the empty bottle down and reinserted the pacifier into her mouth. She sucked it and began playing with the blocks and shaking the rattle. Her stomach growled as she realized that it was time for lunch. Starlight teleported herself back to the main hall and made her way over to the diaper pile. She picked up a jar of mashed peas and brought it back into the kitchen. She opened the jar, poured more milk into her bottle and retrieved a spoon. When she went to go and sit down, she came to a halt and decided to convert one of the table chairs into a high chair. She got into the high chair and put her bottle, jar and spoon in front of herself. It didn’t taste as bad as it looked. She suckled on her bottle and ate the mashed peas. She finished the jar and drank more of her milk until it was empty. After finishing, she wiggled out of the high chair. She transformed the high chair back into the table chair.
Starlight then teleported herself back to the library. She shot a magic laser at another one of the teacups and it transformed into a large stuffed purple bear. She embraced the stuffed animal in a warm hug, nuzzling it.
“So comfy and soft!” she said, cuddling it. She put it to the side.
Starlight felt a familiar pressure in her stomach. She suckled her pacifier as she heard a soft trickle of pee escape her. She pushed as a warm, strong stream of pee continued. Her diaper began to yellow and sag.
“Ohhhh…” she sighed. “Mmm… good thing foals wear their potties.”
She could feel the pressure building beneath her tail. Starlight continued peeing. Her years of potty training told her what she was doing was wrong. She was trying her hardest to fight against it. Her butt was squeezed shut tight, not wanting to let go until she was at the toilet.
“Ahhh!” she started grunting and moaning softly.
Starlight raised her tail. Her round, pony butthole twitched, quickly opening and closing.
She told herself, trying to relax, “It’s ok to go now. You aren’t a grown pony, you are a little baby filly.” She winced, feeling the strain in her rear end.
“You are supposed to poop whenever you feel like it.”
She finished urinating as the stream slowed to a few spurts and stopped. She huffed and grunted louder as she pushed harder, trying to relieve herself.
She suddenly felt her ponut starting to relax. She let out a long sigh as it opened up. Her diaper started to fill with a warm, fresh load. It landed with a few muffled plops.
She praised herself and thought, “Good girl.”
Her muzzle scrunched up.
“I’m a naughty little foal,” she said aloud.
Her diaper began to sag at the back. When she was finished, she sat down with a satisfying squish.
“Ohhhh… that feels so good!”
This act brought back a flood of memories for her. As a young filly, Starlight enjoyed pooping in her diapers all the time. Her mom used to refer to her as her “poopy princess.” The mess stuck to her butt. She drooled a little behind her pacifier as she was in such foalish bliss. She played with her baby rattle, listening to it shake.
Starlight grabbed the large stuffed animal, hugging it close to her body. She cuddled against its soft body. Before she knew it, she had fallen asleep. After some time, she woke up from her nap and yawned. She had drooled behind her pacifier. She didn’t know how long she’d been sleeping. Her diaper still felt surprisingly warm and heavier.
“Did I make more poopsie woopsie when napping?” She asked herself, blushing.
She sounded like her dad with that comment. Starlight also wasn’t really bothered by her own smell. As she got on her hooves, the back of her diaper sagged more than it did before.
“I guess that answers that question,” she said, her face flushing brighter.
She waddled over to the nearby bathroom and glanced out the window. It seemed like she had been asleep for probably an hour and a half, judging by where the sun was. She looked in the mirror. Starlight started to redo her mane, putting it into pigtails with blue hair bands. She let out a girlish giggle, seeing herself in the mirror. It was like she saw her filly self in her reflection. Glimmer shook her diaper in the mirror. It was like she was a little filly in a grown pony’s body.
Starlight waddled back as her diaper crinkled and swung between her legs. She picked up the stuffed bear and rattle as they glowed with magic. The mare teleported back to her room and placed them on the floor. Glimmer then transformed a teacup into a diaper changing mat. She didn’t want her floor to get dirty after all. Her diaper squished on the floor as she sat down on it. That feeling never got old to her. Starlight put a new diaper under the older, full one. She blushed as she opened the diaper, getting the full smell. She cleaned herself up with several wet wipes and put on a clean diaper. Then she tossed the rolled up diaper into the diaper pail.
Starlight was so preoccupied with herself that she didn’t hear when Twilight and Flurry came back to the castle. Spike was left at the hospital to finish reading to the sick school ponies.
“Starlight, we’re back!” Twilight announced, as she rolled her niece in with her baby carriage.
When she didn’t hear any response, she assumed that Starlight was busy with work. The foal made a flushed, focused expression, then giggled and smiled innocently. Twilight blushed as she sniffed Flurry’s diaper.
“Smells like somepony needs a change before more playtime,” she said.
Twilight was about to change her niece’s diaper for the very first time. Or any foal in general, since she has never helped Pinkie with the Cake twins. She opened one of the diaper packages and pulled out a diaper before placing Flurry on the floor for a change. She cooed as her diaper squished.
“Ok, you can do this, Twilight,” she sighed and said nervously to herself. “You’ve read several books about this.”
She had read The 101 Guide to Foals, A Guide for New Parents and Babysitting 101. She teleported some wet wipes and foal powder beside her. Flurry suckled her hoof. Twilight pulled open the tabs of Flurry’s blue diaper. She then slowly pulled down the front…
Sometime later, after Shining Armor and Princess Cadance had left with Flurry Heart, Twilight wanted to find out what Starlight had been up to since she left. She began by checking the cutie mark map room, but found nothing.
“I’m back, Starlight,” she called out.
She then went to the library and noticed a few picture books and toy blocks that she hadn’t taken out for Flurry.
“Where did these come from?” she wondered aloud.
It also smelled like somepony messed themselves. Twilight fanned one of her wings to disperse the smell. She thought it might be because she had changed Flurry Heart’s diaper twice after they had gotten back to the castle. She checked several other locations without any sign of her friend. She did continue smelling something in certain places like somepony had an accident. She finally decided to check Starlight’s room.
“Starlight, I’m back,” she repeated. “Flurry left with Shining and Cadance a while ago,” she told her.
She knocked on the door with her hoof. Why wasn’t she answering? Is she still asleep or is she sick? She wondered, frowning. Her ears twitched as she thought she heard giggling from inside.
She slowly opened the door and asked, “Starlight?”
Twilight gasped when she saw what was in the room. She noticed two diaper packages, a stuffed bear, baby bottle, foal powder and a rattle. But in her face was Starlight’s padded rump with her tail in the air. She had a pacifier in her mouth that dropped to the floor. Twilight’s eyes were wide open and her mouth was agape. The faces of the two mares were both flushed crimson. Their eyes were locked with each other, unable to look away. The stillness was palpable.
After a long silence, Twilight uttered, “I guess I went from foalsitting one foal to another much bigger foal.”
