Big Sister's Noble Duty

by Yukito

Rating: mature
Tags: Slice of Life, My Little Pony: Friendship is Magic, Sweetie Belle, Other, Rarity, Sex
Length: 2556

Sweetie Belle is having trouble pleasing Button Mash. Rarity offers a helping horn.

Button Mash asks Sweetie Belle if she can give him a glowjob before bedtime, but the young filly has trouble using her magic in such a way.

Unable to see her sister in such despair, Rarity steps up to perform her duty as a big sister!

Inspired by an image created by Ohohokapi. Sorry I can't link to the specific one but that is apparantly against the rules. If you turn off explicit filters though you'll recognize it from the (poorly) edited cover art :pinkiesmile:

Published 2015-09-23 20:20:01 UTC
Last updated 2015-09-23 20:20:01 UTC

Big Sister's Noble Duty

"Button, stop!"

Button Mash grinned and pounded harder. "There's no stopping me now! Take it!"

"No, stop! You're hurting me!" Sweetie Belle screamed as tears streamed down her eyes. "S-Stoooooop!"

"OOOOHHHHH YEEEEEEEAH! HERE IT COMES!"

Sweetie Belle groaned and threw her controller to the floor. "No fair! You cheated!"

"It's called skills, not cheats," Button replied as he placed his controller down calmly onto the floor and cracked his hooves. "That's five-nothin' ta me."

Sweetie Belle puffed her cheeks and crossed her forelegs. "I told you to stop! I'm not used to this game!"

"I did ask if you wanted me to go easy on you-"

"I don't need your pity!" Sweetie Belle yawned and rubbed her eye. "What time is it? It looks dark outside."

Button Mash pushed the 'home' button on his controller and looked to the clock that appeared in one corner of the screen. "Wow, it's late! I think we have time for one more round, though."

"I don't wanna play this one anymore," Sweetie Belle pouted. "Let's find a racing game! I'll kick your butt at one of those!"

"You're on! Just don't cry like you always do!"

Sweetie Belle kicked Button's foreleg, before proceeding to change the game that was in the console. The two spent the remaining hour playing, racing against each other and trash-talking, growing quieter as time passed them by and their young foal bodies grew tireder and tireder.

"Gotcha!" Sweetie Belle cheered as she finished the race, securing the top position of the leaderboard. What followed was a lengthy yawn, before she asked, "Do you think we should call it a night?"

"I think so," Button Mash agreed, stretching his forelegs and yawning with Sweetie Belle. "You wanna use the bathroom first?"

"Such a gentlecolt," Sweetie Belle giggled as she rose to her hooves. "Be right back, then."

"Mhm…" Button Mash turned to watch Sweetie Belle leave. A move that would betray him as he caught sight of the filly's behind just as her tail had moved to the side, granting the colt a generous view of her 'goods'.

Normally, this would not bother the foal. Lately, however, his body had not been acting the way it should have been. He felt hot whenever a filly got too close to him, nervous whenever one spoke to him unprovoked, and worst of all, at night, his colthood would…

"Oh no," Button whispered as he looked down, finding his 'joystick' poking out of its sheath. Usually it wouldn't stand so tall, so proud, and so… solid. But at night, when his mind craved sleep, he would find himself thinking about fillies from school and whenever he did so, his 'little friend' would come out and greet him.

And when it did, he found it very, very difficult to fall asleep. Thankfully, he had discovered a method. Something his brother had told him the first night it had happened, when he calmly and politely went to him for help in his time of need.

"BROTHER I THINK SOMETHING'S WRONG WITH ME WHAT IS IT OH GOD AM I GOING TO DIE I'M TOO YOUNG TO DIE WHAT DID I EVER DO TO DESERVE THIS HEY BROTHER WAKE UP C'MON PLEASE WAKE UP WAKE UP WAKE UP WAKE UP WAKE UP WAKE UP WAKE UP WAKE UP WAKE UP WAKE UP WAKE UP WAKE UP-"

His brother had told him to shut up, and then told him that the only way to make his 'erection' go down was to 'jack it 'til the white stuff comes out'. Button Mash learned that 'jacking it' meant grasping the shaft firmly with his hoof and then moving it up-and-down.

Button commenced this ritual, knowing that there would be no chance of sleeping that night until he had calmed down. "Ah…" Button didn't exactly hate having to do this every few nights. He just wished it didn't take so long, as it took away time from his two favourite things – gaming and sleeping. He also wished it didn't make him moan out uncontrollably.

Biting his lip, Button tried to be quiet as he worked his rod.

"Again?!" Sweetie Belle cried, startling the colt who almost hit the ceiling as he jumped in fright.

"S-Sweetie Belle?!"

Sweetie Belle huffed. "Why are colts so weird? Us fillies don't have to deal with all this!"

Button Mash groaned. "I-It's not like I can help it! My brother just said this happens to all colts when they grow up!"

"Well, since I'm here now… want me to do it for you again?" Sweetie Belle blushed as the question left her lips. She had touched Button down there many times before, but that fact didn't make the situation any less embarrassing for her.

Button Mash gulped. Ever since the first time that this had happened during one of their sleepovers, his mind would always drift back to Sweetie Belle whenever he touched himself. There was something different about the way she rubbed him that made him crave her touch again.

Sweetie Belle had offered this favour to him a few more times, and every time she did so, Button Mash slept like a log afterwards. "C'mon, let me-"

"O-Okay," Button Mash said, removing his hoof and leaning back. His rod stood up majestically into the air, twitching as it begged for some attention.

Sweetie Belle stared for a few seconds. No matter how many times she saw it, she was still in awe each time. To think that something so big could be hidden between a stallion's legs in everyday life.

As Sweetie Belle moved her hoof forwards, Button Mash spoke up. "U-Um… C-Could you try… something new, tonight?"

Sweetie Belle tilted her head and asked, "Like what?"

Rarity yawned and stretched her forelegs as she finished her final dress for the night. "Well, some ponies may have given up and called it a night by now, but I'm no quitter!" Rarity held up her dress in triumph, examining it to ensure its quality. "And with hard work comes beautiful rewards! I shall put this in the window for tomorrow's display for sure!"

Rarity used her magic to sort her dresses into several piles, based on their designs, materials, colours, and fragility. As she did so, she looked up to the clock above her and gasped. "Goodness gracious! It's so late! I had better make sure that those two are in bed and not still playing those silly games of theirs!"

As Rarity walked up the stairs of her home and down the hallway, she couldn't help but notice the lack of banging, exploding, giggling or screaming from Sweetie Belle's guestroom. "Hmmm, that's not good. Those two are not usually so quiet together…" As Rarity reached the door, she raised a hoof to open it. Before she could, however, she heard a faint voice from inside. "… No, Rarity, you shouldn't pry."

"Do WHAT?!" Sweetie Belle squeaked from inside.

"… But on the other hoof…" Rarity nudged the door slightly, biting her lip as a tiny creak came out from the hinges. "I shall have to oil that tomorrow." Peeking inside, Rarity could see two figures in the shadows.

"My brother said it felt real good when his marefriend did it for him."

Rarity's eyes widened and her cheeks turned red. 'S-Surely they're talking about something completely innocent that my dirty adult mind contorted to something perverted.'

"He said magic feels way better than a hoof, and that way you don't have to touch it."

"B-But I don't mind touching it…"

"Pleeeeease? Please please please please pleeeeeease?"

Sweetie Belle groaned. "Oh, fine. I-I'll try…"

Rarity was unsure what to think. No matter how she tried to interpret their words, she couldn't find a single innocent viewpoint to contextualize their conversation. Suddenly, a green light illuminated the room. It came from Sweetie Belle's horn, and when it did, Rarity could see that Button Mash was leaning back on the floor, his penis standing erect in the air.

"O-Oh my…" Rarity wasn't sure whether to flee or confront them. Would it be right to leave them to it and respect their privacy? Or should she step in and lay down society's rules on them like a tonne of bricks? Should she monitor them to see if they are being safe and responsible? Should she tell somepony? Should she-

"What's wrong?" Button asked, his penis shrinking a tiny bit as it stood still in the cold air of the room. He brought a hoof to it as he began to pant. "C-C'mon."

"I-I'm trying," Sweetie Belle said, a tear dripping from her eye.

'Is she trying to give him a glowjob? It looks like she's having trouble grasping it.'

"Can't you do it?" Button Mash asked, a hint of disappointment in his voice.

Sweetie Belle hiccupped. "I-I'm sorry…"

Rarity gulped. Her sister was beginning to cry. She was trying so hard for the colt that she loved but was unable to do anything. 'Poor sister. Please don't cry…' Rarity turned his attention to Button Mash's hoof as it began to pump his penis. 'M-Maybe I can help her out…'

Rarity focussed, gathering her magic into her horn, and then guided it to Button's shaft. She could feel the soft, tender flesh in her magic, as though she were gripping it herself with her hoof. 'For Sweetie Belle,' she told herself as she closed her eyes.

"Ah…" Button removed his hoof and turned to Sweetie Belle. "T-That's good…"

Sweetie Belle's tears slowed to a halt. She looked at Button's big, goofy smile, and then turned his attention to his colthood. "I-I'm doing it?"

"OHH!"

Sweetie Belle jumped back a little. "It feels that good?"

Button Mash could only nod with an affirmative grunt in response. "Mhm!"

Sweetie Belle smiled. "I-I'm glad. For a moment there, I thought I couldn't do it. I-Is there anywhere in particular you want me to, uh… y'know…"

Button Mash simply stared at the ceiling for a couple of seconds, before finally registering Sweetie Belle's words and wiping the drool from his mouth. "M-My brother said the h-heeeead feels nice."

Sweetie Belle nodded. "Alright, I'll give it a go."

Rarity opened her eyes. Sweetie Belle was staring intently at the head of Button Mash's cock. With a quiet moan, Rarity redirected her magic, stopping her magical pumping and instead gently massaging the head of the little colt's shaft.

'Why does this make me feel… Oh Celestia, no. He's just a child! I can'tbe feeling like this!' Rarity heard Button Mash's moans and cried of pleasure and had to fold her ears down. Every groan, every sign of approval, only served to increase the dampness between her legs. 'This is for Sweetie. I'm not into foals. This is for Sweetie. I'm not into foals.'

"You want me to try touching your sack, too?" Sweetie Belle, surprising both Rarity and Button Mash. "R-Remember? You said it felt real good when I did it with my hoof, last time."

Rarity couldn't believe her ears. Her own sister and this colt… Was this the norm for kids these days?

"P-Please," Button Mash managed to get out between pants.

Sweetie Belle nodded her head and focussed. The colt thrust his hips upwards suddenly, and she couldn't help but giggle. "So it feels good?"

"YEEEEEEESSSSSSS!"

Sweetie Belle blushed, and gave a warm smile. "W-Wow. Thank you…"

Button Mash began to squirm and writhe on the floor, his body dripping in sweat and his breathing ragged. "S-Sweetie Belle, c-could you do the s-shaft and my balls t-together?"

Rarity herself was sweating too, both at the prolonged application of her magic, and at the hoof she had buried between her legs. It was not moving, however. It was simply there to quell the fire burning in her loins, but she maintained that she held no sexual attraction to young foals.

'This colt sure can last,' Rarity thought as she spread her magic, grasping his shaft firmly once more whilst still cupping the little colt's sack. As she gently massaged his testicles, she pumped furiously along Button's length.

"OHHHHH! AAAAAHHHHHHHH, S-SWEETIEEEEEEEE!"

Sweetie Belle gasped. "Wait! I-I need a tissue!" Sweetie Belle looked around frantically, finding a pack of tissue on her bedside table.

Rarity followed Sweetie Belle's gaze and groaned. She had to focus even more magic in order to pick up a couple of tissues from the box, before bringing the over to Button Mash and holding them above the head.

"AAAAAAAAHHHHHHHHHHH!!!!"

Rarity felt the colt's penis throbbing wildly, and knew that 'it' was happening. She brought the tissues down just as Button began to fire his load, thrusting his hips into the tissues with each spurt. Rarity realised that she was still masturbating him and quickly stopped, focussing entirely on collecting every last drop of Button's semen so that it did not stain the lovely carpeted floor.

As Button Mash calmed down, Sweetie Belle turned her attention to a nearby trashcan. She narrowed her eyes as nothing happened, and then grunted. "C'mon, stupid tissues!"

Rarity gasped. She had paid so much attention to Button Mash's orgasm that she had completely forgotten what she was doing. Quickly, she moved the tissues to the trashcan and deposited them neatly. She turned back to Sweetie Belle's face… and saw her smiling.

"Was that good?" she asked.

Button Mash picked himself up and nodded. "I-It was AWESOME!"

"I'm so glad!" Sweetie Belle cheered as she hugged the colt tightly.

Rarity smiled. 'I-It was all worth it, then.'

"You were amazing, Sweetie Belle!"

"Anything for a great friend!"

Rarity's eye twitched. ''F-Friend'?! You'd better be more than friends after all of that!'

Button Mash yawned, followed by Sweetie Belle. "We really should go to bed now," Sweetie Belle said.

Button nodded in agreement. "I-I gotta go… do the thing… with my teeth…"

"Sure. I'll put the games away."

Rarity gasped as the two rose to their hooves, and Button Mash began heading her way. Quickly, she took off down the hallway, clambering down the stairs and taking refuge inside of her kitchen.

After taking a seat, Rarity was left alone with her thought. She was alone in the compact kitchen, only the sounds of a ticking clock keeping her company. As her actions of the last few minutes flashed through her mind, Rarity placed her face into her hooves.

"… How could I be so stupid? What am I going to do the next time he wants Sweetie Belle to do that?" Various scenarios ran through Rarity's mind. Button Mash breaking up with Sweetie Belle. Sweetie Belle falling into depression. Even the best-case scenario, in which Button Mash doesn't mind and Sweetie Belle gets over 'losing' her ability, ends with her little secret being found out when Sweetie Belle questions how she did it the first time.

Removing her hooves, Rarity looked over at the phone to her side. Using her magic, Rarity brought the phone to her face and pushed a few buttons. After taking its time to ring and being picked up, Rarity said, "Hello, Father? Yes, I know that it's late. Listen, I've been thinking, what with my recent successes and all… I would like to put forward some money to help find Sweetie Belle a professional magic tutor."