Chapter One: Absorbency, Check!

In a small cozy study in a giant tower that stood over Canterlot. Inside there was a single simple desk made of oak, with a few thick books placed upon it. Each book contained various magic spells. A few sat open next to an ink pot with a dozen scrolls lying about notes scrawled across them. Near the desk was a big window and beyond it the clear dark night sky with glittering stars and the full moon with its light illuminating the room. There was even a very comfy brown couch in the back of the room. In the middle of the cozy, simple room, a young purple-coated unicorn named Twilight was laying on her back exposing her belly on a big poofy pink changing mat. It was an odd feature in such a simple room designed for studying. Even the studious mare knew this, and despite her respect for places of learning she gave the gaudy object a sheepish smile and whispered, “the only reason I’m doing this because I don’t want to use the bathroom while I study I need to get a hundred on tomorrow's test.”

Twilight took out a big white bottle within a sparkly a pink aurora over her rump and carefully began to sprinkle the white powdery substance over her crotch and tush. She looked on with her tired purple eyes gauging the amount of powder that should be added to her seat and whispered, “slow and steady that’s what the book on proper foal care said. I have to make sure to cover the entire genital and rump is completely with the white powder.” The mare continued to pour the powder making sure to cover every inch of her purple fur with the powdery substance.

Twilight looked down at her rump and nodded seeing not a speck of purple fur through the thick film of white powder. Nodding in approval, she threw her perfect straight black and pink striped mane from her face that came down her shoulders and gulped with a nervous expression as she lifted a giant white diaper over her head. The padding was big and thick with a big giant baby silver moon printed on the back of the diaper with little purple stars printed around the moon. The purple unicorn eyed it with suspicion and mumbled, “Moondancer said she wore these to help her study for the last test. Hopefully, she wasn’t just trying to embarase me.” She shuddered at the thought of one of her classmates seeing her in a diaper.

She then began to strap the diaper around her rump slowly unfolding the giant plastic square. Twilight then started to strap it around her backside slowly folding the front of the diaper over her belly. She then used her telekinesis to lower two straps onto the plastic landing zone with a dark blue field with little yellow stars printed on it. She smoothed the diaper out with a hoof and slid it around the baby blue leak guards that encircled her thighs to make sure the padding was snug. Twilight then slowly threaded her long purple and black striped tail through the back end of the diaper until popped out of the tail hole. She smiled at how the diaper was perfect around her rump and whispered, “alright now for the pajamas.”

Twilight lit her horn again as she hovered a set of giant purple footed pajamas. The fabric was covered in stars and swirling galaxies that made it look like something from a night sky. Twilight slowly slipped into the cute pajamas moving one leg at a time through each leg hole. She drifted her tail through the back tailhole then pulled up the zipper making sure it was perfect around her body. Twilight slowly rolled herself over and got onto all fours. She rose her body from the ground with the thickness of the diaper under her. The mare looked behind her and analyzed the massive diaper bulge and whispered, “I need to walk around and make sure it doesn't slip off or cause any issues while I’m studying.”

Twilight was getting used to it was added weight and decided to wiggle around the study. The padding was thick making her legs spread out and blushed seeing how exaggerated her waddle was. But the diaper itself shifted around her rump was tightly strapped around her bottom. Twilight satisfied with her test she continued with a smile, ”alright now I can start my studying.”

Twilight happily waddled to her seat and plopped down with a small poof of foal powder and a low wheeze made by the air escaping through the leg holes. A small blush rose on Twilight's cheeks as the mare slowly turned to see a cup of steaming coffee and slowly picked the cup up with her magic. Despite her caution the diaper crinkled with every small movement making the mare uneasy. But she continued to and slowly sip her drink despite the constant rustiling from the diaper. She placed the cup down on the small glass plate on the table still trying to get used to the embarrassing crinkles. Twilight then frantically picked up her books and a quill as she tried to forget about the foalish garment strapped around her and exclaimed, “alright time to hit the books!” She then began to analyze the open spell book and began to write notes down with her quill.

six hours later…

Twilight was deep into her studies and had a dozen scrolls jolted down with spells and complex puzzles. But, she has also drunk a couple of cups of coffee with three porcelain cups placed on top of each other as proof. Twilight was busy drinking the fourth cup looking over a scroll that she held within her magic, and she realized that the pressure in her bladder was starting to build within her. She groaned and scrunched her back legs into the thick padding. “No! I was hoping I wouldn’t have to actually use it.”

Twilight sighed looking at her fourth cup of coffee and slammed a hoof into her face. “Yet I was dumb enough to have four cups of coffee.”

Twilight unable to escape the pang of needing to pee she grumbled,” alright diaper you better do as the label proclaims or im getting a refund."

She started to let go of the pressure and sighed as she began to pee into padding. The mare blushes hearing the loud hissing noise that came from underneath her soft pajamas. But, the padding was thick and did its job in holding in the urine. Twilight out of curiosity prodded the diaper bulge within her footed pajamas making low squishing noises and gave a big sigh of relief, “it worked and did a swell job of keeping the urine in.” She giggled at the pun. “Swell job.” The mare laughed and kicked about in her soaked diaper making squelching noises. Twilight meeped from embarrassment and continued to flip through the pages of her spell book trying frantically to forget about the fact she just peed into a diaper.

five hours later…

It was still dark when the princess of Equestria woke up at about five in the morning. Celestia yawned as she stretched out her big white feathered wings and flung her long flowing colorful mane. She slowly stumbbled out of bed and mumbled, “hmm. Tomorrow is that big test, tons of papers to grade.”

She chuckled knowing her top student Twilight sparkle was probably staying up all night to study. Despite her telling the young mare time and time again that it was better to just get some rest. Celestia blushed realising how much the two have bonded since that young filly joined her school. Then her alarm clock ringed and she slammed a hoof down on it and growled as she walked her way to the bathroom. As the princess brushed her teeth and fixed her mane she looked into the bathroom mirror at her tired face and droopy eyelids. Celestia shook her head still wondering why she woke up so early. The princess still had an hour before she needed to raise the sun. Celestia turned to her window and whispered, “I wonder...should I check on Twilight?"

She then unfurled her wings and threw herself into the night. She flew through the air scanning the houses and found Twilight’s tower at the edge of the city. Celestia smiled and dived down towards it and gazed into one of the windows. She gasped upon seeing Twilight Sparkle. She was zonked out on in her study with a bunch of books scattered over the desk and the piles of notes stacked near her with the ink pot spilled over making a puddle of a thick black goo on the floor. But what caught Celestia's eyes, even more, was the cute footed pajamas Twilight wore with a big diaper bulge that shown through the fabric. The princess sighed shaking her head. “Silly mare what are you doing wearing diapers. Wouldn’t changing them take more time than just using the bathroom?”

She opened the window slowly and flew over Twilight. The princess smirked as she lifted Twilight within an aurora of magic seeing how the diaper sagged from underneath the pajamas. from the chair and laid down on the pink changing mat still set up in the middle of the room. Celestia slowly unzipped the pajamas down the middle and couldn't help but snicker as she unveiled the huge thick yellow stained padding with fading purple stars on the front. Celestia gave it a few taps hearing it squish under her hoof and scoffed. "You did a number on this diaper soggy butt."

She then slowly unstrapped the diaper and hummed as she took out some foal wipes and began to clean the filly’s groin area.

The purple mare still fast asleep murmured, “m..mommy wh..why..why are you changing me?”

Celestia giggled at the remark and played along as she cooed, “I knew you would be staying up late tonight for that big test later this afternoon. I was just going to come by to make sure you get some sleep.”

Twilight continued with a dreamy smile, “ I’m. I’m sorry mommy I wet the bed,”

Celestia paused realizing that Twilight was still deep in her sleep and continued the role as her mom and cooed, ”now Twilight, I don’t mind you wetting the bed. Now, how about after your diaper change I tuck you in and read a storybook.”

Twilight gave a tired no and whispered, ”yes mommy I would like that.”

Celestia with her gentle smile whispered, “alright well just hold still sweetheart.” She uncapped the foal powder in a blue aura and drifted over Twilight’s rump and started to powder it thoroughly until her rump was completely covered in the white substance again. Twilight seemed unaware as she stirred, “mmm...I’m here for the test mommy.”

The princess smirked thinking of a way to play along and continued, “yes now can you sing your ABCs?”

Twilight whispered under her breath. “ABCs...A is for Anthropomorphic...B is for Biomass...C is for Cellular reconstruction...”

Celestia dawwed under her breath and pulled out another one of the big thick diapers. She couldn't help but smirk seeing the big silvery moon on the seat of the diaper. She shook her head and chuckled, “I'm betting Moondancer got these for you huh? I remember her saying something about wearing diapers to help her study. I thought it was a joke.”

The princess just slowly lifted Twilight’s legs with her blue aura and slipped the diaper underneath the mare's rump and watched as. it sank into the padding. She then slowly slipped Twilight's tail through the tail hole and cooed, “that’s right good job sweetheart now can you count to three?”

Twilight kicked about on her fresh padding making it crinkle and murmured, “one short sparkle...two shots of lightning...three drops of liquid nitrogen.”

Celestia giggled and finished strapping the tabs over the diaper’s tabs on the landing zones. She rubbed a hoof down the soft diaper hearing it crinkle she felt a warmth in her chest where she knew deep in her heart she always wanted a foal but never had the time to care for one. Celestia then zipped the pajamas up carefully making an as little sound as possible. She lit her horn and slowly levitated Twilight off the ground as a cacophony of crinkles made from the fresh diaper echoed throughout the room. Celestia then slowly tip-hoofed up some steps to her student's bedroom. There she found a basket with Twilight’s baby dragon Spike sleeping soundly curled up in a ball as his tail was popped in his mouth sucking away on it. The princess smiled a little and whispered, “looks like we have two babies.”

Celestia continued tucking Twilight underneath the sheets of her bed. Twilight stirred and whimpered, “Mommy...I...I'm wearing a diaper..”

Celestia paused again and with a smirk answered in her motherly tone, “it’s okay diapers are okay to wear at school.”

Twilight paused seeming to think about what Celestia just said. The mare seemed to have clamed down as she whispered, “okay mama, can you read me a story now?”

The princess nodded “once upon a time there was a little unicorn who studied really hard, But she also liked to wear diapers. One day she accidentally went to school in her diapers and was laughed at it. But the teacher told her students not to laugh and brought the little filly to the front of the class to show how brave she was. Instead of laughing the class cheered and they all got As.”

Twilight stopped fidgeting and mumbled, “thanks mommy.” Celestia just gave Twilight a sweet smile as she drifted the blankets around her student's neck and kissed her on the cheek. “Goodnight and sweet dreams Twilight.”

She then adjusted her alarm clock by the bed setting it about around ten A.M giving her enough sleep and more than enough time to get ready for the test at noon. The princess took one last look at her student all tucked under the blankets with the diaper bulge still showing through. The princess couldn't help and coo, “all the little filly is missing is a pacifier.”

The princess lit her horn and a cute pacifier popped in Twilight’s mouth with the sun rays printed on the mouth guard. Twilight unconsciously gave it a few suckles and soon it started to bob up and down naturally. Celestia smirked and took out a small camera and snapped some photos. “Oh, I'm going to keep these forever!” The princess then stepped towards the window and flew through and into the night.