Ryu's Sibling Incest Tournament

by WhatDidIJustRead

Rating: mature
Tags: Other, Sex, Twilight Sparkle, Princess Celestia, Crossover, Human, Main 6, Princess Luna, Porn, My Little Pony: Friendship is Magic, Comedy
Length: 4708

Ryu from Street Fighter shows up in Equestria, and holds a tournament. The best sibling incest wins a grand prize, a mysterious and powerful artifact.

Ryu from Street Fighter shows up in Equestria, and holds a tournament. The best sibling incest wins a grand prize, a mysterious and powerful artifact. Ponies from all over Equestria show up to compete.

This was not written for the sibling incest contest. It's just a nonsensical parody based on it.

Cover art is by illu-mint.

Published 2019-05-02 04:50:01 UTC
Last updated 2019-05-02 04:50:01 UTC

All the sibling incest. All of it!

Twilight Sparkle stepped into the arena, her pussy moist and winking. Shining Armor entered as well, from the other side. In the middle, there was a human, named Ryu, wearing a shabby white karate gi with the sleeves torn off. He had come from Earth mysteriously, about a month prior, and organized a giant sibling sex tournament. With a base prize of twenty-five bits for simply entering, ponies and their siblings came from all over Equestria to compete. His motivations were unclear, but Princess Celestia had assured her subjects that the offered prizes were legitimate. A microphone hung before him, and he spoke into it.

"Ready?" he asked. Both ponies nodded, and the crowd became silent. "Round one... fuck!"

Twilight immediately teleported herself and her brother to the middle of the ring, barely giving Ryu time to get out of their way. Shining Armor immediately mounted his sister, and slid his cock inside her winking pussy.

"Ahh, yeah, Shiny, breed me!" Twilight shouted. She wasn't normally much of a talker during sex, but she chose to act differently to impress Ryu and the crowd.

Shining Armor smiled and slammed his erection deep inside his beloved sister, eliciting a sharp cry from her that quickly became a moan. He leaned forward and bit her mane to hold it gently before thrusting inside her with long, powerful strokes that massaged her velvety inner walls. She immediately orgasmed, and a small splash of marecum fell to the arena floor, earning a muted cheer from the crowd.

"Twily... I love you," Shining said, his heartfelt and genuine words sending a surge of arousal through his little sister below him.

"Mmmf, I love you too, BBBFF!" Twilight cried. She orgasmed again, and heard telltale grunts from her brother that signaled his approaching climax. "Yes! Cum inside me. Breed me, Shiny!"

He obliged. His cock's tip flared deep inside her as it kissed her cervix. A deep moan left his lungs as he unloaded his seed inside her, spurting rope after thick rope of his semen into his beloved sister. As her twitching walls were painted white and her thirsty depths filled, much of the sticky fluid leaked directly into her womb. Twilight moaned as her love tunnel convulsed around the welcome intruder, milking it for every drop. Her voice filled the stadium, arousing thousands of onlookers.

As Shining Armor's orgasm tapered off, the two were left panting and sweating. Twilight turned her head around and they kissed while he was still inside her. The crowd went wild with cheers and shouts of encouragement. Ryu himself seemed to be smiling, and Twilight was sure she had a shot at the grand prize.

Applejack was being brutalized by Big Macintosh's monster of a cock while Apple Bloom licked his balls.

"Do you have it with you?" Princess Celestia asked quietly, commandingly.

Ryu hesitated and narrowed his eyes. "Of course I do. I wasn't about to trust one of you to look after it."

"Good. Just know that I fully intend to have it in my very own hooves by the end of this competition." The Princess's smirk held a confidence built upon a thousand years of wisdom.

Ryu smiled. "As I said, there are no rules prohibiting you from entering. In fact, I encourage it. You and your sister are especially intriguing to me, and I believe that should you win, you would wield it well."

"Ha. We would master it within a week," Celestia said. From the arena, Applejack screamed a little too forcefully as her brother's excessive load leaked from her pussy.

"However, you must still win, fair and square, and I promise to be quite honest in my selection of the winner, just as your spells have ensured," Ryu said. "I look forward to your performance."

"Ready?" Ryu asked aloud into the microphone.

Rarity and Sweetie Belle nodded.

"Round one... fuck!" Ryu said, and stepped aside as the two ponies quickly met in the middle of the arena.

"Just like we practiced, Sweetie," Rarity said. She lay down on her back and spread her legs.

"Right!" Sweetie said.

Rarity's lovely purple tail lay in sagging coils, and her perfect pink pussy just above was on display for all to see, framed by her pristine white coat. She had spent hours grooming her nethers to perfection for this night, and used well-practiced muscle control to make it wink more at the audience and Ryu than Sweetie Belle. The filly approached slowly, and she lowered her head. Her small tongue flicked out and lapped at the bulbous clitoris presented to her. Rarity let out a convincing whimper, and kicked her leg at the air.

"Oh, Sweetie, I've dreamed of this moment," she said quite dramatically.

Sweetie Belle stopped. "You have?" she asked with a tilt of her head.

"Uh... yes, darling, now please continue eating me out!" Rarity replied with a forced smile and mostly-contained frustration.

Sweetie shrugged and dove back in, her soft tongue working the lovely folds of her sister's treasure. She lapped at it, from her perineum upward, dragging across the exposed pleasure button, then repeated the motion several more times as Rarity's moans became louder and more genuine. Sweetie enjoyed making her sister happy, and smiled as she thrust her tongue inside the dripping entrance. The beautiful, tasty pussy quivered and leaked, and Sweetie felt herself warming up as she continued to please her closest family member. She whimpered as her small hoof fumbled at her own fillyhood, scratching an itch that she always got when she did this for Rarity.

"Sweetie, I'm... I'm... gonna cum!" Rarity announced with a very real quaver in her voice.

"Mmmn, mmm!" Sweetie replied, and she sped up. Just as she had practiced, she swirled her tongue in circles five times inside Rarity's pussy, then pulled it out and suckled on her clit. Rarity screamed in pleasure as she orgasmed, her pussy leaking multiple spurts of feminine cum onto the arena. Sweetie Belle orgasmed as well, her fillyhood twitching against her hoof. The two ponies hugged sweetly to roaring applause from the crowd.

Ryu smirked from the edge of the arena. His hand was in his karate gi, just above the waist, idly stroking an object. It was as hard as stone, and smooth as melting ice. It seemed to radiate a dark power. These two would not win it, but they had made a fine effort.

Mr. Cake was presently at the edge of the ring, talking to his one-month-old son. Mrs. Cake was on the opposite side giving a speech to her daughter, also one month old.

Ryu's face was stone, perfectly hiding the burning shame and disappointment he felt for this pathetic effort at obtaining prize money. "Ready?" he asked into the microphone. He received no clear answer, but the question was never truly meant to be answered. "Round one... fuck!"

"Alright, Pound, get in there and give 'em a show!" Mr. Cake said, nudging his young, confused son forward.

The baby crawled toward the center of the ring, meeting his twin sister in the middle. They stared at each other.

"Suck his dick, sweetheart!" Mrs. Cake shouted from the edge.

Pumpkin Cake approached her brother and burbled. They both just sat, confused, and Pound tilted his head. Being a rather precocious pegasus, he flapped his small wings, flying playful circles around his sister. She giggled and fired harmless magic beams at him from her small horn.

"No!" Mr. Cake cried. "That's not sex at all! Dammit!"

Ryu couldn't help but smile at the cute display, but these two were not worthy of the Fuck Edge. He stealthily ran a finger over it again, feeling its dark power. Eventually, from the thousands of ponies here, two would impress him enough to earn it.

"Ready?" Ryu asked.

"Heeey, Terramar!" Silverstream shouted excitedly across the arena. "Are you ready?"

Terramar turned his head away and sighed, rather embarrassed by his sister's overeager and hyper demeanor. He nodded.

"Round one... fuck!" Ryu said.

Terramar walked forward with his head down, trying to remain as unnoticed as possible for being in a spotlight in front of a crowd of thousands. He gasped as he was suddenly tackled by his hyperactive sister and pinned down.

"Wow, Terramar, who would've thought that we would be here doing this in front of all these, nnh," she said as she slid his mostly-erect cock into her cloaca, "ponies. Doesn't this just feel amazing? Ohh, I hope we win the grand prize. We could really use another powerful artifact to keep us all safe, because what if the Storm King comes back?"

She was presently impaling herself repeatedly on his cock, and his lack of experience was bringing him close to an orgasm already. Silverstream's cloaca was rippling with repeated orgasms herself, which she almost seemed not to notice as she continued talking excitedly.

"Can you imagine how proud Mom and Dad are gonna be If we win? I bet they're watching from the stands right now! They said they would be. HI MOM AND DAD!" she screeched out to the crowd. "Anyway, I have a huge egg inside me just waiting to be laid, and... oh hey! Did you just cum? Awww, how sweet! So, as I was saying, this egg, I've been saving for a month now, just for this competition. It's my secret weapon! Here, check it out."

Silverstream stood up from her dazed brother, with his semen dripping from her cloaca. She squatted next to him, and her face twisted as she strained and struggled, muscles inside her convulsing and relaxing as she pushed. Her cloacal entrance widened, and an egg almost as big as her head began sliding out. She strained, sweating as she pushed the huge ovum out, and it slipped onto the hard arena floor. Silverstream panted, but had the energy to turn around and pick up the egg, blue with pink speckles, and held it up for the crowd to see. Her brother's seed still lingered on it, and she proudly licked it up.

The crowd went wild.

"Yes," Ryu whispered under his breath. "These two may be worthy of the Fuck Edge." He idly played with it yet again, feeling the thousands of trapped human souls wailing in agony. The sacrifices that had been required to make it...

Ryu was genuinely surprised to see Thorax and Pharynx. Changelings were quite odd in their abilities, and he had not expected such creatures could exist, let alone compete in his tournament. Nevertheless, he had made a promise, and they did indeed show up.

"Ready?" Ryu asked. Both bugs nodded. "Round one... fuck!"

Thorax stalked to the center with a gait that could only be described as regal yet submissive. Pharynx flew, confident and impatient. When they met, Thorax spoke.

"Hey, Pharynx, could you go easy on me this time?" he asked.

Pharynx smirked, and Thorax's hopeful grin vanished. Pharynx tackled his larger brother to the floor, leaving Thorax on his back, helpless and pinned under his brother.

"Pharynx! Please, I don't like it when you're so rough!" Thorax complained.

"Hah, well, too bad. You need thicker chitin anyway," Pharynx said as he grabbed his brother's long, tapered bug cock. He twisted it around to Thorax's own anus and poked at it repeatedly. "Quit fuckin' yourself, quit fuckin' yourself! Hahaha!"

Thorax frowned and sighed. "You know it's you doing that," he said.

"Yeah, but it's still funny," Pharynx said as he slid back and between Thorax's legs. Pharynx's cock was hard and ready, and he smirked confidently as he poked at his brother's rear. "Okay, I'll be gentle now."

Thorax smiled. "See? I knew you could be." He applied some changeling slime to his own ass with a bit of magic, and nodded.

Pharynx pressed his cock forward slowly, entering his brother's lubricated cavern. Thorax moaned cutely, and after Pharynx bottomed out, both made happy and approving noises. Pharynx smirked, and Thorax noticed, his expression twisting with worry. The purple bugcock pulled back slowly, then slammed forward, eliciting a surprised cry from Thorax.

"Aah! You promised you'd be gentle!" he cried, but his voice quivered with excitement. It was a game they always played, and Pharynx knew just what buttons he could push to please his brother while never truly upsetting him.

Another hard thrust, and another whimpery moan. Then, a slow and gentle entry that made Thorax's legs flail, and his cock twitched in the air, stiff and pointed toward his own face. Pharynx repeated the slow and loving thrust, then performed two more fast and hard ones that "upset" Thorax, giving his face a pleading look that begged his brother to stop, but they both knew it meant he wanted more. Pharynx slid himself out, then painfully slowly reentered his brother. He sent love directly through their hive mind connection, and Thorax's cock throbbed at the gesture.

"Oh, Pharynx! I... I love you, too," Thorax said.

"Mmh, hey, shut up, I never said that!" Pharynx said playfully with two punishing slams forward. He leaned down and whispered into Thorax's ear, so nopony in the crowd could hear. "But it's true. I do love you."

Pharynx pressed his cock forward gently, and Thorax began to cry tears of happiness as his cock flared. Spurts of bright green changeling cum flew from the tip, splattering his face and chest. Pharynx smiled at his cute dork of a brother, and made love to him until his orgasm ended.

As soon as Thorax was finished, a glint appeared in Pharynx's eye. He suddenly began pounding Thorax's sensitive hole with long, hard, fast thrusts. Thorax, writhing below Pharynx, moaned and flailed cutely, and Pharynx couldn't hold in his own orgasm. He pumped his seed deep into his brother's ass, leaving both of them gasping for air. They hugged, and the crowd exploded with cheers.

Ryu watched them with interest. They seemed like fine candidates for the Fuck Edge. He wished he had seen them transform, as the Fuck Edge itself had similar powers. He kept the two bugs in the back of his mind as the next round began.

Ryu's disappointment was endless as he watched Fluttershy fuck her brother. He was quite possibly the worst pony so far. Arrogance did not go well with incompetence.

He sat next to Celestia.

"So, you're up next," he said.

"Indeed I am. You will find our display quite arousing, I think," Celestia said.

"The Fuck Edge belongs to the pony that earns it fairly in the fires of incestuous sex. While you have the power and experience to wield it, are you truly deserving? We shall see."

"I don't intend to lose to these... novices," Celestia said. Her face was hardened, serious. "And we can't afford to let the most powerful sex toy in the universe fall into the wrong hooves. I will not let my ponies down."

"Yes. Well, pray that all of your competition is as awful as this," Ryu said, indicating Zephyr Breeze, who was presently cumming all over a cowering Fluttershy. "I hope you are ready."

Princess Luna interjected. "We are."

"Ready?" Ryu asked yet again. Celestia and Luna, on opposite sides of the arena, both nodded grimly. "Round one... fuck!"

Both princesses stalked to the middle, commanding attention and radiating auras of power. When they met, they circled each other, eyes locked.

"It has been too long, Sister," Celestia said aloud.

"Indeed. We shall show thee that We are not as rusty as thou may expect," Luna replied.

Both ponies stopped. They narrowed their eyes. Suddenly, Princess Luna glowed with an oddly dark light, and a magical explosion shook the arena. Standing in her place was... Nightmare Moon! The crowd gasped.

"Prepare thyself, Sister!" she said.

Celestia laughed, quietly at first, but it grew to a maniacal, musical barking laugh that filled the entire arena with tension.

"You think that impresses me? You haven't seen anything yet!" Celestia said. She, too, glowed, and she brightened until ponies had to avert their eyes. Another explosion rocked the stadium. The crowd gasped again as they saw, standing in place of Celestia, was Daybreaker! She hissed.

Ryu's eyes widened at the sight. Never had he ever expected transformations to happen in his tournament! He watched curiously to see what would happen next.

"Hahaha! You think that scares us, Sister? We spent more than a thousand years in this form! We've had ample time to perfect it," Nightmare Moon said.

"I don't need to get used to it when I'm already more powerful than you!" Daybreaker cried, and charged.

The fiery, evil sun goddess shot a burning beam of light at her sister, who put up a shield. Nightmare Moon fired back with a ball of black energy. Daybreaker caught the attack in her magic and telekinetically crushed it into harmless vapor. They continued trading choreographed attacks, with none landing, and soon both were out of breath.

"It seems... we are evenly matched," Daybreaker said breathily.

"Ha... you think... you have a chance?" Nightmare Moon replied between pants.

There was a tense, silent moment while they caught their breath.

"No, and you know that you don't either. Let us settle this difference using the ancient rite of sibling incest!"

"Ha! Very well, We accept your challenge. The winner shall be the sole ruler of all of Equestria!" Nightmare Moon laughed, as if she had already won. Daybreaker cut her off with a sudden kiss, and her dark face took on a blush. Both began to make out furiously. Their long, forked tongues wrestled and formed a wet, writhing knot between their open muzzles. They pulled away, both still confident.

"As the eldest sibling, I call top," Daybreaker said with a smirk.

Nightmare Moon laughed. "Very well, but do not expect to earn an advantage from it, Sister."

Daybreaker stepped forward, and Nightmare Moon floated above the arena, using careful flaps of her dark wings. Levitating herself with magic, Daybreaker positioned herself above her opponent, head at the tail end of Nightmare Moon's body. Once in position, both leaned their heads forward and buried their muzzles into each other's plots. They hissed and let their long tongues lash at each other's pussies. As they made sweet, incestuous lesbians to each other, a powerful aura surrounded them, and they floated high above the center of the arena. The two sisters writhed in midair, like snakes in zero gravity. Lewd, wet sounds of sex came from them, seemingly amplified to be heard by the entire crowd. Soft moans and half-hearted growls filled the air as they fucked.

For the first time since the tournament had begun, Ryu had an erection. He nodded approvingly, and shed a single tear.

The two princesses orgasmed in unison, and redoubled their efforts to get the other off. It would take the strength and skill of a goddess to force either one of them into submission via cunnilingus, and luckily both happened to have just that. They orgasmed again, harder, and droplets of their marecum rained down onto the floor below.

Their sex lasted more than an hour.

Their tongues, tired and sore, slowed from lashing to wagging, and their orgasms went from full-body writhing and flailing to limp convulsions.

Finally, the two gently descended to the arena, and lay still for two full minutes. The crowd was completely silent. Both stirred. They stood up, with smiles that were uncharacteristic for their evil personas. They leaned forward and kissed sweetly. When it broke, Nightmare Moon spoke.

"Sister, We do not think We want to rule alone. We concede to thee," she said with a bow of her head.

"I am flattered, but I was just about to concede to you. You've proven yourself much more resolute than I ever imagined," Daybreaker said. Her voice was soft, oddly barely audible but still heard by everypony in the stadium.

"Perhaps it was foolish of both of us to try to win the right to rule alone. What do you say we return to our old positions as diarchs?" Nightmare Moon offered, holding out a hoof.

Daybreaker took the offered hoof and shook it. As she did, both ponies glowed brightly, but this time there was no explosion. When the light faded, Princess Celestia and Princess Luna were holding hooves.

They turned their faces toward the audience and bowed deeply. The roar of applause that came up could be heard all across Canterlot.

"Princess Celestia," Ryu said, "your performance has been by far the best of all. In fact, were it not for the one final group of contestants after you, I would reward you with the Fuck Edge where you stand."

Celestia bowed. "Thank you, Ryu. Let's watch this one last incestuous orgy and hope that it is not better than the show my sister and I put on."

Ryu nodded and headed toward the arena, where four mares were waiting. "Pinkie, Marble, Limestone, and Maud?" They all nodded. He went to the center where the microphone was waiting, and spoke clearly into it. "Ready?" Four nods. "Round one... fuck!"

As the four ponies charged toward the middle, a huge flash of color exploded outward from the center of the ring. Ryu had to shield his eyes, but when he looked, his jaw dropped. Standing in the middle of the arena was a pony that looked oddly familiar...

Rainbow Dash stood between four confused Pies. She ignored them and pointed a hoof at Ryu.

"Ryu!" she cried.

"You!" he said. "Impossible!"

"Don't act like you didn't know this was coming!" Rainbow said.

Princess Celestia stepped forward. "What is the meaning of this?"

Rainbow narrowed her eyes at Ryu. "Why don't you tell her who you really are?"

"I... I thought those were false memories! Then, it was real? It was all real?" Ryu asked. His legs were shaking.

"Well?" Celestia said. "What memories?"

"Rainbow Dash is... is..." Ryu said, struggling. He sank to his knees. "She is my sister!"

The crowd gasped at the revelation. Rainbow nodded. Celestia looked confused, then suddenly terrified. "No!" she cried.

"Ryu Dash," Rainbow said, "I am entering us into the sibling incest tournament!"

Ryu buried his face in his hands. "It wasn't supposed to end like this! If you get the Fuck Edge, you may not be able to control its power. It drains life from its user. If you win, then... then you may be dooming yourself!"

"No, Ryu. I can handle it. I'm actually pretty awesome," Rainbow said confidently.

"Very well. Pie sisters, Celestia? You should all clear out of here."

The wide-eyed ponies nodded and cleared themselves off the arena. Rainbow and Ryu faced each other.

"I will not go easy on you," Ryu said.

"Neither will I," Rainbow retorted.

Ryu slammed his hands together, and a blue fireball appeared between them. "Hadouken!" he shouted, and the projectile flew at Rainbow. She leapt over it and landed on top of Ryu. Her rear hoof kicked at his belt, loosening it. He struggled, but she held him down. His human cock sprung free as she pressed his pants down, and he growled.

"I refuse to enjoy this!" he said.

Rainbow lowered herself onto her long lost brother's cock, and he moaned, betraying his own words. "Refuse all you want, big guy," she said as she impaled herself on him repeatedly.

Rainbow's athletic body made for swift, precise movements as her tight marehood swallowed Ryu's erection. He thrust into her involuntarily, silently cursing himself as he did.

She orgasmed, milking him for his cum. She wanted it. Really, genuinely wanted it. She wanted to make him cum. It was one of the few times that she was not only doing it to win. Not that she didn't also plan to win. Rainbow, with lust in her eyes, locked her gaze with his, and he found himself lost in them, the beautiful purple irises bringing back memories he had thought were mere fantasy. His childhood, so much of it dismissed as false, came back to him, and he remembered growing up with her. With Rainbow Dash. His... sister.

He came.

His cock exploded inside his beloved sister, and his seed flooded her with his release of pent-up need. Spurt after spurt filled her, and he pulled her face down to kiss her as he came deep within her. When they parted, he was smiling, and there were tears in his eyes.

"I missed you, Rainbow Dash," he said sweetly.

"And I missed you too, Ryu Dash."

"I haven't heard that name in ages."

"Well, you're hearing it again now, and you can keep hearing it for as long as you want," she said.

The two lay still. Several minutes passed, and their sweet cuddling ended when Rainbow stood up. She was still leaking cum from her marehood. "Come on. Let's finish up this tournament. I think maybe some ponies here are a little tired of incest by now."

Ryu nodded, and looked over to the Pie sisters. "You may begin, if you'd like, but this contest is likely already over now. And even if you do not have a big four-sister orgy, you will still get your twenty-five bits," he told them.

"It's okay, we'll pass, then," Pinkie said with a warm smile.

Ryu and Celestia stood in the arena.

"Ryu Dash, with the honesty spell placed on you, you will be unable to lie. Now, you must select the winner of your incest tournament," Celestia said.

"Thank you. The winner is, naturally, the one I enjoyed the most. Princess Celestia and Luna... your sex was phenomenal. However, in the end, the sex I enjoyed the most was... that with my own sister, Rainbow Dash. Thus, I declare her and myself the winners. Since I cannot grant myself a prize, however, the powerful transforming dildo, known as the Fuck Edge, goes to Rainbow Dash alone. Please treat it with care and may it not consume your life as it did many close friends of mine."

Rainbow Dash stepped forward from the edge of the arena, and Ryu took the powerful dildo from his karate gi. It was a dark, muddy brown, and pulsed with terrifying power. Once she was close, he held it out to her. She reached a hoof forward, and took the Fuck Edge. It immediately melted to a formless mass, then slowly took a new shape. Its color shifted to a light peach, and its shape looked very familiar to both Ryu and Rainbow.

"It... took the form of my penis," Ryu marveled.

"Well, doesn't it take the shape of the cock its bearer loves most?" Rainbow asked with a grin.

"Then... it really is true," Ryu said. Tears sprung to his eyes, and he surged forward to hug his beloved sister. Celestia wiped a tear from her face as well, and the crowd cheered once again. "I was wrong about you, Rainbow. I do trust you to use the Fuck Edge wisely. I am truly glad I was able to meet you one last time."

Rainbow's smile vanished. "One last time?"

"Yes. For, you see, I must return to Earth. There are people there who are waiting for me."

"N-no! I just got you back! You can't go!"

Ryu began to fade. "I'm sorry, little sis, but this is the way it must be."

"No! Don't go! I'll fuck you every night! I'll... I'll..." Rainbow said, but he was gone.

Princess Celestia placed a comforting hoof on Rainbow's shoulder. "I am sorry, Rainbow Dash. But, at least you still have the Fuck Edge to remember him by."

Rainbow looked at the cock, blurred by her tears, and blinked them away. "Y-yeah. While I have this, he will always be here with me."

Celestia nodded. "How about you give it its first ride here, for all of us?"

Rainbow Dash smiled, hefting the Fuck Edge in her hoof. She sniffled and wiped away her final tears.

"Okay. I'd like that."

Author's Note

As usual, blame Majin Syeekoh for some of the ideas here, like the Fuck Edge being a thing.