[C] Homework

by scribe-feather

Rating: mature
Tags: Twilight Sparkle, Slice of Life, My Little Pony: Friendship is Magic, Other, Romance, Shining Armor, Sex
Length: 6936

With the help of her brother, the teenaged Twilight learns the finer points of the opposite sex. (ABDL and adult themes)

With the help of her brother, the teenaged Twilight learns the finer points of the opposite sex. However, her brother seems oddly interested in the pull ups Twilight wears to bed every night.

Commission for KinkyPony

(Do not continue reading if you do not approve of diapers, diaper usage, incest, or sexual adult situations. If you do not like it or are under legal age, please do not keep reading.)

Published 2014-08-18 01:50:02 UTC
Last updated 2014-08-18 01:50:02 UTC

Homework

Author's Note

DISCLAIMER: Make no mistake here. This is adult, pornographic fetish material about cartoon ponies. Do not continue reading if you do not approve of diapers, diaper usage, incest, or sexual adult situations. If you do not like it or are under legal age, please do not keep reading.

Please do not redistribute, alter, repost this story or anything else I write on this site or some place else without my permission.

Greetings! Scribe here once again!

Here's commission focused on incest and diaper usage. There were a lot of ideas the commissioner wanted and to avoid wasting perfectly good real estate, this story has a lot of "show-don't-tell" rule breaking in it. However, this is just a means to skip to the good parts based on the commissioner's request.

-Scribe

This Story Contains:
Diaper Lover Themes (Heavy)
Diapers (Heavy)
Incest (Heavy)
Sexual Situations (Heavy)
Diaper Usage - Mess (Medium)
Diaper Usage - Wet (Medium)
Masturbation (Medium)
Urine Drinking (Medium)
Watersports (Medium)
Adult Baby Themes (Light)
Teasing (Light)

Homework

Homework
By Scribe Feather

The young teen Twilight had a minor bedwetting problem. A small problem that she's only had for a small amount of time. Six months, two weeks, and four days to be exact. And for those six months, two weeks, and four days, the young pony had woken up in a wet bed.

Her parents started to buy her packs of teen pull ups a couple weeks into the issue. The two hoped she would eventually grow out of the issue. However, Twilight's accidents were frequent and didn't seem to taper off.

A small calendar that hung next to her bed acted as a makeshift chart to keep track of her dry nights and wet nights. Recently the calendar contained a couple solid months of days marked with black marker 'W's. She would have the occasional dry night and she would mark her calendar accordingly, but as of these past few weeks, the pony found no such sanctuary.

She didn't think she'd ever stop wearing pull ups to bed, until one promising night.

"I'm dry!" Twilight said to herself with a big smile one night. Looks like her bedwetting days were almost behind her! Though she did need to pee, her bladder was kind enough to wake her up for that. With quiet crinkles emitting from her still clean pull up, Twilight pulled herself out of her bed and dashed to the bathroom. She made a quick beeline for the room, passing down the dimly lit hallway, past Shining Armor's room's door and straight to the toilet.

Like a big girl, Twilight pulled down her pull ups and plopped down on the toilet. And not a moment passed before her bladder let go, full force into the toilet. She sighed with relief as her bladder relaxed into a loud hiss.

Twilight smiled to herself all happy and excited. She made it! She actually made it to the toilet and didn't use her pull up once!

After she finished up in the bathroom, the young unicorn made a triumphant trot back down the hall towards her bedroom. She was feeling really good about herself. Her clean pull up crinkling between her legs.

She passed Shining's bedroom again, this time glancing in. Only it was more of a glance as the pony slowed her trot to a standstill. She peeked in further into the moonlit room where her brother slept. The glance turned into a peek and that peek turned into a stare.

Her eyes adjusted to the dim light and noticed the gentle rising and falling of Shining's sleeping body. She noticed that his blanket was half kicked off during his late night twisting and turning, exposing his lower half. Her eyes locked onto the small dark mound that rested around Shining's waist...His limp stallionhood.

Twilight always wanted to learn about the extra organ that stallion's had between their legs, but never knew how to ask. For some reason, the mere mention of the thing was avoided by stallions when in polite company. Twilight had a natural scientific curiosity to the matter and Shining was always a pretty heavy sleeper...While she was here...She could always...

With a sensual lick of her lips, Twilight tip toed into the room, quietly closing the door behind her. She paused every other step to make sure her presence wasn't known by her slumbering brother.

She slowly slipped onto the bed, moving ever so slowly to not shift the mattress too quickly. The metal springs creaked quietly as she moved closer to Shining's sleeping body. She slipped between the stallion's open legs and steadied her breath as her eyes adjusted to the darkness. She could make out the shape of Shining's limp stallionhood, dangling between his legs as the pony slept on his back.

Twilight could barely contain her excitement. She had never been this close to a stallion's genitalia before and was excited what new things she could learn from this experience.

Maybe if she just gave it...A little touch?

Shining began to stir, "Twily?" He mumbled as his eyes looked down at his sister. He yawned for a moment and rubbed his eyes, a bedside lamp was magically turned on by the stirring stallion. "What are you doing in..." His words trailed off when he suddenly realized what Twilight was doing.

Twilight looked up from behind the stiff member with wide eyes and color drained cheeks. "I-I...Was just..." Well it was quite clear what she WAS doing. The purple pony was only mere inches away from Shining's morning wood. So close he could feel her breath on it. She laid there stunned for a moment, stammering with words. Her eyes suddenly began to fill up with tears. "Please don't tell mom and dad! Please! I promise I won't do it again! I was just curious! Please don't tell!" The little pony weeped, looking away ashamed of herself. What was she even thinking?!

Shining consoled her like any good brother would. "Hey...Twily...It's alright..." Shining patted Twilight's head in comfort. The whimpering pony sniffled underneath his hold.

"No, it's NOT alright! I shouldn't have come in here, but I was just so curious and now you think I'm just a freak!" Twilight didn't pull away from the head pats, but continued to cry. "Just a diaper wearing freak!"

"Twily, of course you're not a freak. You're my sister," Shining continued to talk to the pony, quietly petting her head as her tears continued to well up in her eyes. "You were just curious what my...My stallionhood?"

"I just wanted to know what it looked like...What it...Smelled like..." Twilight blushed as her eyes started to clear up from crying. They were still a bit red as she eyed Shining's member that was slowly deflating from it's morning stiffness. "I-I was just curious..."

Shining looked over the other pony. She seemed rather interested in his stallionhood and he felt a small interest growing towards her pull ups. Her pull ups seemed uncharacteristically dry today, something that didn't happen all the time. The small interest seemed to grow as Shining licked his lips at a thought that popped in his waking mind. "Tell you what, Twi. If you let me...Wet your pull up. I'll let you study my stallionhood all you want! It'll be our little secret."

Twilight looked up at her brother, cheeks moist with tears. "R-really?" She found some relief that Shining was willing to keep it all a secret and her natural scientific curiosity beckoned her to study further. Although, that did mean she'd have him..."You want to...Wet my-"

"I just don't feel like getting out of bed," Shining added. "I just need to go a little bit. Do that and you can study to your heart's content!"

Twilight wiped a tear out of her eye as she glanced over at her brother's member. It was a tempting offer and she'd have an easier time studying it when not having to worry about waking him up. But that would mean she'd have to have him wet her pull up and she was feeling really good about having her first dry night in months!

"O-okay..." Twilight finally spoke up.

Shining seemed to like that a lot as his face lit up, "Great!" Twilight looked at her brother with a puzzled look. He seemed rather excited to pee into her pull up. "I-I mean...Lay beside me so I can slip my...Into your pull up."

Twilight complied, anything to prevent her parents from finding out. She slid beside Shining's warmth, pressing her pull up clad front up close to his soft member.

"G-good," Shining said, willing his member to stay soft as the crinkling plastic of the pull up brushed against it. He slowly opened up Twilight's pull up from the waist and slipped his stallionhood hood into it's warm padding.

The two ponies laid there quietly for a moment as Shining closed his eyes. It took him only a few moments to focus on his filled bladder. He gently relaxed his body and let his urine flow into the dry pull up. The thirsty padding quickly soaked up his urine, warming up Twilight's pull up all around her waist.

Twilight gasped as she felt her brother's strong stream hit her body before her pull up swelled up and became squishy between her legs. She had never experienced a filling up pull up awake. She had always slept through all her accidents.

This one felt a bit naughty however. It wasn't her pee that was filling up the pull up. It was her BROTHER'S pee! For some reason, that thought sent a chill down her spine. Her brother was wetting her pull up...

"A-ahhh," Shining finally said as his strong stream died down as quickly as it began. His stallion sized bladder filled the pull up thoroughly to the point of almost leaking. He smiled at a job well done, pulling his member out of the pull up and letting it droop there freely.

Twilight paused for a moment, not wanting to move as she felt this strange feeling build inside of her. The warmth of her pull up seemed to amplify this tingly feeling. She laid there for a few moments as the urine was soaked up by her thirsty pull up.

"Ahh, thank ya, Twi." Shining rolled over to his back and sighed with relief. "A deal's a deal..."

Twilight smiled softly as she sat up from her spot on the bed. Her reward had come! And it was in the form of a semi hard rod of flesh that sprouted out of Shining's body like a soft flagpole. Now with Shining's permission, the eager pony examined the organ closely. She studied it's looks and it's smells. She even gave it a couple touches which made it twitch a bit. Like all good scientists, Twilight tried to replicate this reaction by touching the member again, and then again, and then giving it a couple rubs.

Shining's stallionhood started to grow and stiffen as he gasped and batted his sister away. "Th-that's enough for now!" He covered his erection with both hooves, blushing as he looked at his sister. "U-uhm...How about you come back...Tomorrow night and you can study some more."

Twilight looked at Shining puzzled again. What? His member suddenly gets hard and she can't look at it anymore? "Okay..." She mumbled in a defeated way, climbing out of the bed with her thoroughly soaked pull up squishing loudly between her legs. She started to waddle towards the door before she turned her head around. "Shiny?"

"Y-yeah Twi?"

"Thanks for not telling. I won't tell if you don't tell."

"Of course, Twi. Our little secret!"

Twilight nodded and waddled out the door. She made her way back to her room where she slid out of her soaked pull up. The ever diligent pony tossed the soggy garment into her trash and marked a 'W' on a nearby calendar for today. She was really looking forward to putting a 'D' on the calendar tonight, but sadly, it was not meant to be.

✶✶✶✶✶

The next night, Twilight woke up dry for the second time in a row! She happily smiled as she jumped out of bed. Like last night she dashed down to the bathroom and used the toilet there. Her pull ups were nice and dry!

This time however, she found Shining stirring when she passed his room. He appeared to be waiting for her and smiled when she finally walked in. His eyes trailed down to her dry pull up for a moment before looking at the purple pony.

"Twi, y-you came back!" Shining said with a smile as he sat up a bit in his bed. "Could you...Close the door?"

Twilight gently closed the door behind her before waddling up to the bed. She climbed up from the foot of the bed only occasionally glancing down at Shining's soft member.

"You remember how last night my...You know," Shining motioned towards his stallionhood with his head. "when it started to get hard?"

"Mhmm," Twilight nodded, "did I hurt you? Is it suppose to do that?"

"O-only when a stallion's...Really happy," Shining blushed as she explained this. "Would you like to see it do it again?"

Again, the purple unicorn nodded.

The stallion rolled over to his back and pulled his blankets off to the side. His limp stallion hood drooped between his legs as Twilight stared at the organ with wide, curious eyes. "I-In order to make it REAL stiff, you're going to have to...Rub your pull up against it."

Twilight crawled up above Shining, supporting herself with her forehooves on each side of Shining's head. She craned her neck down to view her pull up floating a couple inches away from Shining's member. She looked at her brother for approval and he simply nodded a shaky nod. She slowly lowered her padded waist down against the member.

Shining shuttered a bit as the pull up made contact with his stallionhood that already started to get hard in anticipation. His breathing became shaky as Twilight gave his member the first rub. The padding crinkled loudly as it brushed against the stiffening member.

Twilight continued a steady motion of rubbing against the erection and pausing before rubbing again. Every contact with the stiff member brought back that tingly feeling she got when Shining peed into her pull up the night before. Perhaps they were connected some how?

The white stallion grunted as his erection grew to it's full length, throbbing against Twilight's crinkling pull up. "G-good," Shining moaned, laying his head back a bit with a big sigh.

Twilight paused the rubbings briefly. "I'm not gonna have to pee my pull up again, am I?"

Shining raised his head to assure his sister. "No no, you won't have to use it tonight." He looked down between his legs, Twilight's pull up teased his member as it's padding floated above the twitching organ. "N-now's you can see how it tastes if you want," Shining commented, letting out a shaky sigh.

Twilight nodded as she slowly slid down Shining's bed till her head matched Shining's crotch level. Her scientific curiosity encouraged her to continue. A scientist had to be thorough after all. Plus, there was something else motivating her. Something that made her stomach kind of fluttery when she studied her brother.

She gave it a couple licks, noting the salty, musty taste right away. The member twitched at her touch and low moans could be heard coming from her brother.

Shining seemed to like that a lot. "T-try bobbing your head around it!" Shining rubbed Twilight's pampered rump.

The purple pony complied and slowly slid her mouth over the stiff erection. She brought as much of the throbbing erection into her mouth as she could. Twilight didn't know why, but as Shining touched her rump as she tasted his stiff cock, she felt that same weird tingly feeling overcome her body.

Shining Armor could feel his orgasm building up. He gave Twilight's padded rump a firm squeeze as he squirmed a little under her touch. "M-mph! Poop your diapers,"

Twilight pulled her mouth off of the throbbing member. "What? But you said-"

"I know what I said. B-but I want you to...To poop your diapers! Please!" Shining was too overcome with the sex fueled daze to care about much.

Twilight was hesitant, but she wanted to please her brother so she could learn more and keep these study sessions a secret. Her nose twitched at the smell of Shining's spit covered erection that throbbed inches under here. Her back legs bowed out, knees bent as she closed her eyes and concentrated. It took quite a bit of pushing and mentally resisting her many years of potty training, but Twilight was persistent. She grunted and pushed hard, ignoring her body's natural habit of holding in the mess.

Eventually Shining could feel a lump growing in the back of Twilight's pull up. He moaned quietly as she filled her padding like a toddler, right on top of her with his member mere inches away from her face. The bulge grew as he pressed a hoof into it, squishing it against Twilight's rump.

Soon Twilight finished with a sigh, leaving herself with a messy diaper that seemed wrong at first, but that tingly feeling came back, reminding her what a good job she did. Shining seemed to enjoy it a lot as well. She returned to suckling on the member as her brother played with her mess like molding clay through the diaper.

"Mph! That's it!" Shining moaned as he rested both hooves onto the lumpy mess of his sister's pull up. His hips started to bounce inside Twilight's mouth as she continued to suckle it. "Here it comes!"

Twilight didn't know what that meant, but suddenly Shining's member twitched inside her mouth. He started to thrust his hips upwards as his stallionhood shot strings of sticky cum into Twilight's mouth. Twilight pulled her mouth away in shock after the first spray, causing the last couple strands to spit up and splatter onto Shining's chest.

"S-sorry, I should have warned you it'd do that..." Shining blushed, but couldn't help but smile after one of the best orgasms of his young life.

Twilight swallowed the strange goop, cringing a bit at her first taste of stallion cum. She kind of liked it, but it was something that would have tasted better if she knew it was going to happen.

When Shining finally recovered, he looked over at his sister, who sat in the corner of the bed with a big pouty lip. "I was going to be dry tonight!"

"Sorry Twi. I couldn't help myself. You just look so cute messing your..." Shining had to stop himself. He didn't want to dig himself a bigger hole with his sister. "Tell you what. if you go to bed without changing out of your pull up, I'll make it up to you! Promise!"

Twilight continued to pout a little as she looked up. "Okay..." The pony nodded and climbed off the bed, leaving the satisfied stallion to his own devices. Her heavy mess pulled down her pull up as she waddled out of the room.

The waddle down the hall to return to her bedroom felt like a mile long. Not because of embarrassment or anger, but because of that all too familiar tingly feeling returning to her body. With each step, the heavy diaper bounced, rubbing against her crotch and sending little bolts of pleasure down her spine. The tingling made Twilight smile and even caused her to change her stride to rub the diaper against her more.

It wasn't until she returned to her bedroom that the tingly turned into a burning itch. Her body begged her mind to give the diaper a rub, but she didn't know why.

She hopped into her bed, feeling her mess press between her and the mattress. Her legs wiggled about as the burning persisted. Alone in the darkness of her room allowed her mind to submit to her body's instincts.

A shaky hoof slowly lowered itself down onto the front of the pull up. The front still crinkled loudly, dry as it could be. If only she could say the same for the stinky back. She pressed a hoof into the padding and her body reacted immediately. "Yes!" Her instincts screamed. "That's the right way! More!"

Twilight began rubbing circles into the padding, pressing the pull up into her crotch. She bit her lip as she moaned softly, staring up at the ceiling. Her rubs became stronger and dug deeper into the pull up. Her legs raised up into the air, only to plop back down on her bed to feel that messy pull up squish under her weight. She panted heavily as sweat started to appear on her brow.

She rubbed faster and deeper, panting deeper and deeper. Her legs started to raise as she worked toward an unseen goal that her young body couldn't recognize. Suddenly her body burst with pleasure, sending her head back in a loud moan. Her hips twitched as her legs twitched. Her body erupted with a new level of bliss she never felt before. The burning itch was replaced with a strong wave of relief and euphoria.

The unexpected orgasm left the purple pony in a daze as her mouth hung open in a heavy pant. Her body dropped down onto the bed, completely spent from the blissful burst of feelings.

The diaper was still messy, but she could always take care of that tomorrow. Right now it didn't seem all that important...Right now she was tired and was in need of a good nights sleep. With a smile and a strong scent coming from her diaper, Twilight drifted off to sleep. She felt rather naughty falling asleep with a heavy mess in her diaper.

✶✶✶✶✶

Shining Armor continued these late night 'study sessions' for a couple weeks. He would say that it'd be scientific if they tested each thing more than once to ensure that they got the same result. Many times he would ask to pee down Twilight's diaper or have her rub against his member again or even have her poop her pull ups. And Twilight was all too willing, feeling a small tingly feeling when she studied with her brother. She wasn't sure why, but these sessions felt really good.

Quite quickly Twilight realized that it wasn't the scientific intrigue that pulled her out of bed to meet up with Shining in his room at night. It felt like something...Else and was strongly tied to that tingly feeling that she enjoyed so much.

The two ponies didn't 'study' every night. Sometimes Shining didn't feel safe doing it so many times in a row and decided to play it safe and take a break every now and then. Twilight would find herself willingly filling her pull ups on these days off, finding that she slept better that way. She felt better overall with the loaded diaper, feeling that distinct tingly feeling she got when studying with Shining.

When she messed her diapers, it brought the same tingly feeling that she was all too familiar with, but that tingly feeling would turn into a burning sensation. She eventually learned that if she rubbed her diapers against herself enough times, she experience an intense feeling of bliss and the burning would fade away. The only draw back to this, that the young, naive pony could see, was marking her calendar with a black 'M' for messy rather than her originally sought after 'D'.

Twilight's parents eventually faced hard facts and started to buy Twilight actual diapers that were thicker than her pull ups. They didn't know why her potty training regressed all of a sudden, but they realized that her pull ups wouldn't be able to contain her messy nights. Twilight felt rather embarrassed about the change of nighttime protection, but her parents were insistent.

Twilight quickly warmed up to the idea of thicker diapers. They had tapes so it required a bit more effort and skill to put them on, but they were noticeably thicker. Her goals to stop wetting the bed eventually moved to the back burner. She found filling her diapers was more fun of a goal and she accomplished it so easily.

Shining's eyes seemed to light up when their parents pulled out that first package of diapers. His mind filled with fantasizes of those thick, pink diapers being taped around his sister's rump, sagging as they were filled up. He was so distracted by these thoughts, he just barely caught his parents orders that they would all take turns changing Twilight's diapers if she messed at night. And because of the two's recent late night games, that was almost every night now.

✶✶✶✶✶

A lot of their games were put on hold when the new diapers arrived. Twilight's parents were overly cautious about the new change of undergarment and would check on her every so often to make sure she was wearing them properly. These constant interruptions prevented Shining and Twilight to play the games that they both wanted to play so badly.

Twilight wore the new diapers under adult supervision for a couple weeks. All the while Shining did his best to contain himself, waiting for their next play session. He couldn't have been happier when he heard their parents were going out one evening leaving the two home alone. He did his best not to jump around like a sugar high toddler when he heard the great news.

Shining's mind teemed with ideas and fantasizes as his nether regions tingled with anticipation. When their parents finally left for the night, he worked up the courage to ask Twilight.

"Hey Twi," Shining said in the living room, Twilight raising her head from a thick book that sat in front of her, "do you think you could...Wear a diaper while we're home alone?"

"But I don't have daytime accidents."

"I-I know. I know...I just figured..." he hesitated for a moment. "If you wanted to...Play..."

Twilight blinked for a moment, caught a bit off guard by the request. A smile grew on her face as that confusion erupted into excitement. She had never considered wearing her diapers outside the comfort of her bedroom (and Shining's), and just the very thought brought back that pleasurable tingly feeling.

"Okay!" She chirped as she happily trotted out of the room

Shining waited quietly on the couch for her return. His mind would occasionally wander off to a diaper fantasy of his where a faceless mare wagged her diapered rump in front of him and sucked him off. His cock responded by stiffening a little bit between his legs. When he heard footsteps, Shining urged his semi hard member to die down. Now wasn't the time for that...It had to wait. His mind still buzzed with sexual fantasizes.

Shining's eyes grew wide when Twilight waddled in. The diapers were noticeably thicker, bowing out her legs more than usual. "Those look!-....I-I mean you look...Cute..." Shining gulped.

Twilight blushed as she posed a little bit in front of Shining. She noticed right away that these diapers seemed to excite Shining Armor more than her thin pull ups. "They're so thick though..." She bashfully teased, "I might need...A little help wetting them."

Shining smiled big as he stood up from the couch. "You know the drill," he said with a friendly and excited smile, a twinkle sprinkled in his eyes.

Twilight sat down on the floor and pulled open the front of her diaper, watching her brother intently as he came closer. She could see his member swaying laxed between his legs as he took each step.

Shining Armor's hooves shook as he stood up a tiny bit and threaded his member into Twilight's crinkling, crisp diaper. His experienced and well trained mind took no time at all to direct his bladder to release.

Peeing into Twilight's diaper had gotten easier for the white unicorn each time they did it. Now, he reached a point where peeing into the infantile garment was like using a urinal at a public restroom. However, unlike a urinal, Shining had an arousing wet diaper in front of him for his imagination to run wild about.

Twilight shivered when she felt Shining's member brush against her lower tummy. She stifled a shaky breath as her lower half became enveloped within the pleasure filled warmth. Shining's stream ticked her body as it soaked into the waiting diaper with such strength and speed.

As her diaper swelled up, warmed, and sagged, Twilight's tummy started to gurgle ever so quietly. Shining's peeing started to trigger another reaction in the playful mare. Her mind quickly responded by letting her bowels go, making her moan quietly in relief and pleasure. She grunted quietly as Shining peed away, filling her diaper in the back as Shining warmed the front.

Shining had just barely finished up wetting the front when he noticed his sister's diaper filling up. The mess pulled the heavy diaper down as Twilight's eyes rolled to the back of her head. Shining was surprised how Twilight reacted, shocked that she would just let go as if by instinct. "Did you just..."

Twilight quickly looked up at her brother, blushing a little bit as she finished grunting. That tingly feeling from their nightly games came back as her diaper began to sag between her legs. Unlike the pull ups, the diapers did well to hold it in, appearing to be dry enough for another soak! Even though they've done this sort of thing in the safety of Shining's bedroom numerous times and Shining had witnessed her soiling herself a lot of those times, Twilight still felt a bit embarrassed by how shocked Shining was.

"S-sorry," Twilight looked away as her face reddened.

"I-it's alright. Just shocked is all," Shining replied a bit defeated now that he knew he'd have to change a messy diaper. He couldn't exactly get angry at his sister doing something he's asked her to do so many times before. "I'm just gonna have to...Change you now." Shining motioned towards the middle of the living room floor, "Lay down and I'll go get your supplies."

"O-okay," Twilight watched her brother walk out of the room, his barely hard member swaying less as he quietly walked out. She slowly lowered her diapered rump to the ground, squirming with a smile as the mess pressed firmly between her rump and the carpeted floor.

Twilight felt so exposed out here in the living room getting her diapers changed. She smiled as Shining did everything for her, floating the needed supplies into the room, leaving the purple pony alone to do her own thing. The pony happily wiggled as the all too familiar tingly feeling came back, the messy diaper squishing beneath her rump. She felt so little, so cute, and so turned on.

Shining couldn't keep his eyes off of his playing sister as he placed the diaper changing supplies next to her wiggling body. He swallowed hard as his member stiffed a tiny bit. "O-okay Twi...Try not to wiggle so much. I gotta change you." Twilight smiled with a blush before resting, spreading her legs out like a real toddler. Shining gulped once and began reaching for the diaper tapes with his magic.

The diaper change that proceeded was...Amateur at best. The inexperienced hoof of Shining led to some minor snags in the process sometimes requiring him to re-wipe spots on Twilight's butt he didn't wipe good enough or having to reposition the diaper underneath the pony so that it fit well. When the diaper change was finally concluded with the area clean and powdered liberally, Shining taped the new diaper around Twilight's waist.

"There you go," Shining said as the diaper change concluded, standing up from the floor and helping Twilight back to her feet.

"Thanks." The new diaper was a bit loose around Twilight's waist, requiring a bit of adjusting, but she was happy that Shining at least tried. It never felt the same when she had to tape on her own diapers.

"It's getting kind of late," Shining said as he glanced over at a window where the orange evening sky could be seen. "Wanna...Go to bed?" He said this with such inflections that Twilight's eyes lit up at the suggestion and nodded happily.

She waddled closely behind her brother, up the steps and into his room. The door was closed behind them as they entered, giving them privacy in the empty house.

Shining sat himself on the edge of his bed and looked at his thickly diapered sister. "Are you...Thirsty?" Shining Armor asked with quirky emphasis on thirsty.

Twilight smiled up at her brother, knowing exactly what that meant. "Mhmm!"

Shining opened up his legs with a big grin and Twilight kneeled in the space provided. His soft member sagged in front of Twilight, beckoning her. Twilight took hold of the hefty cock and slipped it into her mouth without being told. She acted on instinct as her body begged for her to continue.

Slowly, Shining relaxed, letting go of a stream of urine into Twilight's mouth. He sighed as it began to grow in strength, spraying into Twilight's mouth who hungerly sucked it up like a toddler with a bottle. It took every thread of control for Shining not to completely let go into his sister's mouth. He had to take it slow, occasionally slowing down his stream so that she could drink it all and not spill any of it.

Twilight drank down every drop of the salty yellow liquid that entered her mouth. Her body tingled as the taste of the pee sent shivers down her spine. She could feel her tummy filling up with the warm urine, making her feel extra naughty. She closed her eyes as she obediently drank it all down, feeling naughty and little as she did.

About half way through Shining's peeing, a loud hissing could be heard in the quiet room, accompanying his own stream. He glanced down and saw Twilight's body relax as her fresh diaper started to yellow around the middle. She moaned behind his still peeing member as she filled up her diaper.

"Naughty girl," The stallion mumbled with a shaky voice. Shiny could feel himself getting hard as he watched Twilight wet her diaper as she drink his urine. He 'mmphed' quietly as Twilight did her best to keep up with the constant stream of urine the filled her mouth.

After a few arousing minutes his stream finally ended with a trickle as he moaned with relief. Twilight paused for a moment, swallowing the last of his urine. Without being told, Twilight began bobbing her head around Shining's growing erection. It took a lot of doing, but Shining managed to urge her off. "W-wait wait Twilight. None of that tonight."

Twilight popped her mouth off of her brother's twitching erection and looked up at him. She tilted her head in confusion. Shining ALWAYS wanted to finish when he got hard.

"I thought we could try something...Different tonight." Shining seemed more nervous this time around as he spoke. "Lay down on your back with your butt sticking up."

"You're going to spank me?"

"N-no no! This is going to feel good for the both of us! Trust me!" Shining assured his diapered sister who climbed onto Shining's bed, resting her head on his pillow as she stuck her yellow diapered rump into the air.

Shining followed suit, climbing up behind Twilight and positioning his crotch behind Twilight's butt. He pulled Twilight's warm diaper to the side, giving him access to her inviting tail hole. He grabbed his stiffening member and gave it a couple rubs. The excited organ didn't need much encouragement to get hard as Twilight's diaper squished loudly in front of him.

"J-just relax and let it happen," Shining spoke softly as he guided his cock's tip close to Twilight's tail hole.

Twilight's body heat could be felt as Shining's member floated closer and closer to her. Shining teased the tail hole with the tip of his member before he started to push it in. A whiff of urine brushed past his nose as he slowly inserted himself into the warm, inviting tail hole.

Twilight grunted, the pain of her tail hole being stretched made the pony cringe. She felt her tight flank being pushed open by the invading member and in a strange way the pain felt pleasurable. She did her best to heed her brother's advice and relax as the member slipped into her inch by inch. Her virgin tail hole would tense up every now and then, but with great mental control, Twilight coaxed it into staying as relaxed as she could manage.

Shining moaned as he slipped in deeper into his sister's tail hole. His member twitched inside of her as he slowly slipped in and out of her in a steady motion. He began speeding up the thrusting, sliding his cock in and out of Twilight at a quickening pace.

Twilight moaned loudly as the bed springs creaked underneath the two. She gripped the bed sheets tightly as the pain melted away to envelope her young body with bliss. She wanted more and Shining was giving it to her.

Shining's mouth hung open as he moaned as well. his hips smacked against Twilight's rump as he thrust into her over and over again. His arousal fueled his lust as he reached the deepest of orgasms.

Suddenly Shining's member pulsed inside Twilight, spurting out strings of sticky cum. He moaned louder than ever before, twitching behind the purple pony as he thrusted his hips into her. His cock shot out a few more strands of cum before he started pulling out the spent member.

Twilight moaned as she felt her rump being filled up by the sticky mess. She still had that strange itch that she planned on taking care of later, but her brother seemed done.

Shining moaned as his member was pulled out, quickly softening after it's job was done. He practically collapsed down next to Twilight with a big sigh. "M-mph...That was heavenly Twilight..." He spoke between pants with a big, satisfied grin on his face.

"I-I'm glad you liked it," Twilight replied, finally plopping down on the bed next to Shining. The two laid there for a moment, content with just resting for a moment. Both were wiped out by the sexual play.

However Twilight was still unsatisfied and needed to take care of that all too familiar itching that came from her crotch. But she couldn't do it here, not with Shining in the way. "I'm pretty tired," Twilight finally said, stretching her limbs and forcing a fake yawn. "I'm going to...Head to bed."

Shining could barely answer with any words. He simply mumbled something that resembled a "okay, good night Twi," and laid there in a dazed state. Twilight waddled out after giving Shining's soft member a final glance.

Twilight stopped in the middle of the hallway and began to squat. She felt so naughty, squatting there out in the open, like a real toddler. With a mischievous grin she began to push out her mess, Shining's cum acting as lubricant. The mess slipped out of her loose tail hole with ease. It happened so quickly and so easily and before long Twilight was left with a bulging, wet, and messy diaper.

She twisted around to look at her diapered rump that now sagged down to the ground with the fresh mess. She pressed a firm hoof into the padding and grinned big. "I poopy," she whispered ever so quietly to herself with a teasing giggle. The weight of the diaper pulled the padding down as Twilight waddled back to her bedroom.

Twilight's thick diaper squished under her weight as she crawled into bed. She shivered as the mess inside pressed against her sensitive rump. The lustful itch returned to the young teenager's body as she glanced up at her calendar. There wasn't a single 'D' drawn on it's days. All that could be seen were a mixture of 'W's and 'M's as Twilight reminded herself that SHE was the one who made all those nights mess.

"You're a naughty, poopy girl," she mumbled to herself as she placed a hoof on her diapered front.

She rubbed her young pussy faster and faster, steadily making it more slippery inside her diaper. She panted heavily as the tingly feeling she so loved amplified and grew to a whole new level of pleasure. "M-mph..."

The rubbing became more intense as her diaper squished and crinkled loudly inside the quiet bedroom. Her legs floated in the air as she moaned louder and louder.

"A-ah!" Finally Twilight reached that blissful cringe, her entire body heating up and erupting in euphoria. Her cheeks flared up as her diaper started to warm up with the slippery liquid.

Her body suddenly became relaxed and she now wore a big smile on her face. The messy diaper beneath her squished around with every slow movement she made.

With a satisfied sigh, Twilight pulled up her blankets and drifted off into a deep sleep. A kind of deep sleep that could only follow a playful rubbing session.

She didn't think she'd ever stop wearing pull ups to bed. Now she didn't want to wear anything, but her diapers.