Incestuous Pony Antics (w/ self insert OC)

When Shining Armor finally awoke, it was dark. Perhaps two in the morning, with just the calming light of a crescent moon illuminating the crystalline bedroom. As his blurry eyes adjusted to the darkness, he only gradually realized that he was cuddling with a stallion.

And his sister.

He was cuddling with a stallion and his sister.

And he had the stallion’s cum all over his face and in his belly.

And his own cum was on Twilight Sparkle’s face. And in her belly.

His eyes widened as he realized his cock was quickly hardening again.

“Good morning, Shining,” whispered Pinewood, rubbing gently down the unicorn’s shoulder with one hoof.

Shining Armor shivered slightly. It was partly from his remaining surprise at what he’d done last night, and partly from how good it felt to let the green stallion caress him like this. He’d always been straight as an arrow, always lusted over beautiful mares alone, and never considered intimacy with one of his same sex.

But here he was. Shining’s legs were intertwined with Pinewood’s. And the back of Shining’s neck nestled in the warm pit of Pinewood’s foreleg. Shining’s horn rested gently across Pinewood’s upper chest, the soft green fur like a grassy field for Shining’s gracefully tapered spiral bone.

And Twilight… oh, beautiful Twilight slumbered in the mirrored position, her face just close enough to his that he could just lean slightly to kiss her…

What was wrong with him?! He saw a little snail-trail in the corner of her mouth, no doubt a remnant of his own sticky cum.

The white unicorn suddenly gasped as he felt Pinewood’s thick green member throb impatiently between their thighs. He now realized that their cocks were crossed with each others’, and if they humped their hips forward they could fuck each others’ firm yet yielding abdominal areas.

Pinewood did just that, grinding his body slowly so his cock would probe and glide across the supple skin of Shining’s crotch.

“Goo--hood morning, Pinewood!” Shining Armor gasped his response, bucking his own hips so he could feel more of their two cocks. His thick dark tool twisted and shoved around Pine’s, each one gradually rising to its full hardness against the other.

A pang of guilt or shame suddenly made Shining Armor stop moving. “Wait, I don’t think we should do more…” he tried to protest.

Pinewood stopped as well when he heard that. “Why do you say that? Aren’t you enjoying yourself?”

Shining Armor bit his lip and tried to clear his head. Trying not to wake Twilight, he turned his head upward so he was nearly kissing Pinewood instead and whispered, “I mean, I’m a married stallion! I can’t do this to Cadance! And me being with Twilight is just wrong too!”

“But you don’t regret last night, do you?” Another beseeching throb of Pinewood’s cock against Shining Armor.

The unicorn gulped involuntarily. Why did he salivate like that just now? His tongue felt all slippery and ticklish inside his mouth. “No, last night was amazing… I just don’t know if it’s a good idea.”

“I’m sure Cadance will understand. She is the Princess of Love after all, and if her stallion has needs she can’t fulfill…” Pinewood’s cock throbbed again to drive home the point.

Shining still seemed unconvinced. “And what about Twilight? I mean, she’s my sister… fantasies when I was young might have been okay, but actually doing anything…” He looked back down at Twilight’s peaceful face.

She really was beautiful, especially now. Twilight Sparkle had a bit of an afterglow about her, with maybe the faintest of pulsing magical energy that was just barely present surrounding her horn. If you were close enough to feel it, that is.

Shining felt his sister’s powerful magic in his lips and in his own horn. It reverberated with the different, yet complementary beating of Pinewood’s heart so close to the unicorn’s ears.

“I was absolutely serious earlier,” Pinewood murmured soothingly. “Twilight and I have a bond much stronger than most ponies in love. She gives herself unconditionally and unstoppingly to me. So you can trust me when I say she loves you enough to want your happiness in everything, including the deepest, fiercest, and most satisfying of fantasies. I can tell that you still want to feel her marehood give way to your virile advance. You want to fuck your sister, don’t you?”

“Uhh…” Now it was Shining’s turn to throb a quick bead of precum between their bellies.

“Who says it’s wrong, if you both enjoy it, anyway? She clearly wants you too, and it would only make you both so happy.” Now both ponies’ cocks throbbed twice in unison, and Pinewood grinned at the way Shining Armor was blushing.

“Well I…” mumbled the unicorn as he wiggled his hips again.

“Then kiss the sleeping Princess,” Pinewood encouraged.

Oh, Twily, he thought as he leaned in and met his sister’s muzzle again, this time tasting the cocktail of his and Pinewood’s cum mixing between their two tongues.

Twilight’s eyes fluttered open and she sucked him harder into the kiss, passionately leaning into his muzzle and bringing her wing down to embrace his body. Her hind leg rose up to sneak in between Pinewood’s thigh and Shining’s cock, and she smiled while rubbing it for a moment.

“Good morning, big brother,” she said before yawning, turning her head away from Shining while stretching out her jaw muscles. With an adorable flip-flop of her ears, she turned upward now, giving Pinewood a kiss on on his chin. “Good morning, Sir.”

“Good morning, love,” he returned, resting his nose against hers for a second or two while hugging both siblings tightly to his furry green body. Then with a sigh he released his gentle hold, kissing Twilight four or five more times, on different corners of her muzzle. “Why don’t you present yourself for our guest? He seems to have a friendly member who would like to get to know your deepest secrets.”

Twilight gave her big brother a sultry look before untangling herself from the bed, standing up and facing the wall. Her rump was directly in Shining’s view, and even within his reach if he were to roll off of Pinewood’s body.

Before Pine unwrapped his leg from Shining Armor, though, he gave the unicorn a knowing glance. “This is a favor I’m offering to you. I only request that you consider returning it in the future,” said the green stallion.

Shining Armor gulped and considered the massive green tool that throbbed against his own. “I’ll think about it. I mean, thank you. For sharing Twilight with me, that is.”

Smiling, Pinewood gently helped Shining off the bed and then leaned back to watch the show.

Shining Armor walked slowly around his standing sister, admiring her from all angles. His cock swung heavily underneath him, and he loved how he could feel the fresh stream of precum begin to rise and flow, dripping steadily from the tip.

Twilight held her wings tightly to her body until he leaned in close to kiss the muscles at their bases, and as the twin feathered appendages slowly rose and unfurled toward the heavens, she let out a softly pleasured sigh. On the underside of her wings, the fluffy down, finer than the finest silk, beckoned for Shining to explore with his lips. The princess stifled a gasp when she felt him nibble slowly along the contours of her shoulder, tracing his way up the leading edge of her wing until his neck was extended as high as he could go. Then he reversed his motion, taking a slightly different path back down and burying his muzzle into the dreamy fluff in the crook of her wing.

It was magical, and Shining Armor savored every moment of it. He’d made love to an alicorn before, sure. But never to Twilight Sparkle. He smiled as he felt her body respond to all the same tricks he’d had to learn to please Cadance, though his sister was responding a little differently. Twilight’s body smelled so vividly unique compared to his wife’s, and Twilight’s proportions were likewise a wonderful change from what his own body had been used to touching.

Shining ran his left hoof across Twilight’s back now, gently stroking her wings to a relaxed position nestled against her sides. “I love you so much, Twily,” he sighed, kissing her neck.

“I love you too, Shiny,” she whispered back, pressing her body harder against his flank.

He wished that he could capture this moment to always have an image of Twilight like this, so eager and ready to be rutted by her big brother. It was intoxicating, this intense desire, almost dreamlike because he’d only ever thought it could happen in a dream. But it was real; it was so real that it looked real and smelled real and felt real.

And his stallionhood was really ready.

After a quick little nip of his teeth on Twilight’s neck, Shining Armor reared up, feeling his muscles all work together in that familiar masculine action of mounting a mare. He groaned loudly into his sister’s ear when his cock found its mark on the first thrust, the hot wet outer folds of Twilight’s pussy quickly engulfing the first few inches of his shaft. He froze in place, feeling a throb of precum ooze out of him in response to the overwhelming wetness. It was like his cock was already incredibly sensitive, teetering on the edge of orgasm and yet somehow still in his control.

“Oh fuck, Twilight, you feel so good,” he finally said, pulling himself backwards and grinning at how her muscles swirled and twitched with anticipation. He willed his body to have strength of muscle now, shifting his weight back and forth between his legs and Twilight’s hips as he slowly slid into her again only to stop at the halfway point.

“Nhaaa…” the princess whimpered when she realized that he was teasing her like this, holding back and then pushing forward just a tiny bit. She shivered with anticipation.

Torturously slow, Shining Armor pulled back out completely this time, letting his cockhead press downward to catch Twilight’s winking clit the next time his hips pushed forward. “Fffff…” he hissed with pleasure, grinding the upper edge of his knob against the miniature tongue-like hardness of his sister’s button. Around and around he circled that sensitive little nub with every ridge of his cockhead, fucking it harder and coating it with so much precum that a thick clear glob fell wetly to the floor below them.

“Oh, goddess…” moaned the princess. Her whole body was now writhing in sync with Shining’s, her tail pressed up against his abdominal muscles and her shoulders rising up and down trying to find the right angle. She was desperate to feel him inside her. “Fuck me, Shiny!”

One,

Two…

Three impossibly long seconds passed, each sibling holding back breath only to feel the deep pulsating throb of the other’s heartbeat and arterial thrums.

“Hnn!” Shining exclaimed as he humped forward, steadily thrusting his entire length inch by veiny inch into his sister’s welcoming depths. He didn’t stop his forward movement until he felt the inner limits of her body, that taut and powerful ending of her love tunnel, stop him and press back to resist the motion of his cock.

Squeeze!

Twilight’s tender flesh suddenly firmed up in certain delectable places, rippling tightly in a tight oval to surround Shining’s staff from its base to its hard rigid head. He bit down on her neck now, too far lost in seeking his own pleasure to care that he might be causing a little pain to his trembling little sister. She couldn’t seem to stop whimpering now as waves of dopamine and serotonin bounced back and forth along with magical and electrical impulses inside her mind and body.

“Oohh, yes…” she moaned with him. Twilight had always been so attractive, but now in the throes of ecstasy as she waited for her brother to pull back out and really start fucking her… the lavender alicorn was just too beautiful for description.

Shining Armor pulled backwards, more vigorously now, and with another sharp gasp he pounded deeply inside her again. Slap after slap, his balls swung heavily underneath his advancing cock until they collided wetly against her flank.

Twilight couldn’t decide whether to hold herself back and wait for her orgasm later, or to just let every perfect feeling take over her body now. It was almost too late for her to try to change the inevitable, anyway. Shining pulled back, hissing with intense pleasure the entire time, then pushed deep into his moaning little sister over and over and over again.

The sounds of flesh on flesh filled the air, and on one particularly hard thrust forward Shining Armor felt a deep clench of Twilight’s body resist him when he pounded firmly against the entrance to her womb. Then he moaned as he felt a new hot swirling wetness that suddenly surrounded his cock and trickled out her lips to run down his thigh… it must have been the thick load Pinewood had pumped into her womb earlier that evening!

“Fuck!” the princess yelped, wishing she could have maintained her grip on Pine’s seed. It was definitely too late to try to stop her brother from fucking the cum out of her now. She was just about the crest the point of no return, and while Shining was savoring the sensation of her creampie oozing out steadily around his hilted member, she didn’t want to waste this chance to cum hard with him. “Don’t stop, Shiny! Fuck me harder!”

Few words could ever spur a stallion into overdrive like those, and Shining Armor released his biting hold on her neck to grunt his own response. “Oh, goddess, Twily… your cunt is so fucking hot and wet…”

His cock began to throb steadily with every time he pulled backwards, and the shovel-like flare of his cockhead caught another slippery glob of cream which then fell heavily onto the floor below them. The unicorn’s mind was reeling with pleasure as he considered how wrong this all was, how wrong it should feel to gain pleasure from the sloppy wetness of his sister’s pussy, how wrong it was to let himself go and let Pinewood watch, how wrong it was to so obviously become the submissive stallion putting on a show for the earth pony’s ultimate enjoyment. But it didn’t matter, as Pinewood had said. They all wanted this, and they all were having a good time together. Wrong was so right!

The ambient glow of Twilight’s horn increased in fits and starts along with Shining’s ragged breaths as the two ponies writhed and pistoned each other back and forth. Neither one wanted the ecstasy to end, and yet with every rolling moment they were riding higher and higher up the roller-coaster ramp towards release.

“Shiny…” Twilight whimpered, feeling her knees begin to tremble. Her clit was like a glowing ember now, sending hot sparks of pleasure that manifested as little skittering sparks all the way through her body before escaping from the tip of her horn every time her brother’s scrotum slapped wetly against her crotch. Her labia were coated with the nearly frothy exudation of Pinewood’s milky white seed, and thick swirling dribbles of the sloppy mess were now covering Shining’s cock from tip to base, even running down his ballsack too.

“Oh, I…” Shining found it all too exciting that he was using another stallion’s emission to lubricate his eager cock, and as his own orgasm began to rise in pressure deep within his body, he pressed his muzzle even harder into the delightful little bit of warmth between Twilight’s ear and her neck. His nostrils flared like those of a wild mustang, and he felt every muscle in his body seem to cry out with joy as he plunged deeper and deeper and deeper into his sister’s twitching body, forcing her to feel every rock hard vein of his cock until he felt that he could slide no deeper--- “I… I love you, Twily!”

“I love you, Shiny!”

And then he came.

The siblings came together, grunting and moaning and squirting hot cum and magic all over each other.

“F-- fill me up, Shining!” Twilight moaned in between her cute little gasps for breath, riding high on her orgasm. The pulsing change in Twilight’s marehood, no longer leaking Pinewood’s seed but now eagerly accepting the addition of Shining’s cum into the swirling mess inside her womb, caused Shining Armor to bite down so hard on his sister’s neck that he could swear he tasted a little blood on his tongue. It didn’t matter, though, as the magical reverberation between the two ponies made it clear to him that she enjoyed the pain, letting him mark her like the slutty sex toy that she truly was. Little fireworks shot forth from both of their horns, lavender and magenta and other nearly indescribable ultraviolet hues that glittered and seemed to echo the powerful release that Shining felt himself give to his receptive sister.

At the same time, feminine wetness gushed forth from the hidden recesses of Twilight’s marehood, rinsing part of the previously-frothed stallion’s seed from her labia and then washing down both ponies’ hind legs in a hot slippery waterfall of marecum. The scent in Shining’s nostrils was erotically overpowering, a mixture of his own testosterone, his sister’s unbridled desire, and of course Pinewood’s dominance over the entire situation. The alicorn whimpered as she finished cumming, bucking against her brother in little squirts and gasps. “Don’t stop, please Shiny… don’t stop.”

It seemed that the initial feeding that Pinewood had given to Shining Armor, though not potent enough to fully put the unicorn in Pinewood’s control, had certainly had some kind of effect on how Shining Armor’s body and mind responded to demands like this. He climaxed for far longer than he’d ever recalled, pumping more and more of his seed into his sister until he felt his balls finally give up as they parked themselves snugly against his body, emptied and satisfied. His cock remained hard still, and he experimentally gave the member a few strong twitches inside Twilight’s depths. No more of his offering came out of his flared cockhead, but it still felt good to tweak and flex that pubic muscle while pegged so tightly inside his sister. She responded with a couple of undulating flexes of her own, the wet slurp of her outer labia like music to his ears.

“Nnaahh!” He grunted and nipped her playfully on the ear now, his sensitive cockhead almost stinging with the added stimulation of her last squeeze. “I don’t think I ever want to stop, Twily,” he whispered lovingly, then kissed her cheek and sighed. “I’m so happy that we could try this together.”

“I’m glad you enjoyed it too, Shiny.” She smiled back at him. “Truthfully, I guess there was always a little part of me that wanted to be with you like this… and now we’re more than just siblings.”