For Purely Scientific Reasons

by dietcokewithlime

Rating: mature
Tags: Random, Shining Armor, Sex, Twilight Sparkle, My Little Pony: Friendship is Magic, Romance, Comedy
Length: 6780

Twilight requests the assistance of Shining Armor with a new experiment. One which may or may not prove uncomfortable for the stallion.

Twilight Sparkle requests the assistance of Shining Armor with a new experiment. One which may or may not prove uncomfortable for the stallion.

WARNING: Unwanted incestuous alicorn fellatio. (Mostly.)

Published 2014-10-23 23:50:02 UTC
Last updated 2014-11-15 01:51:20 UTC

Magic Sock

Shining Armor headed across the street and noticed the oddest of sights exiting from Twilight’s castle. With a large grin plastered on his face, the immense red stallion shut the door to the house before running a hoof through his mane. His face was flustered something fierce.

“Hey, Big Mac!” Shining greeted, waving a hoof.

Any trace of a smile on Mac’s face shrunk to a thin line as he viewed the unicorn. A deeper shade of red bloomed in his cheeks while his eyes popped out comically.

Shining ignored this. “Did Twilight want to speak with you too? About the research she’s conducting?”

Big Mac scanned both ends of the streets anxiously. “Nope,” he muttered.

Shining furrowed his brow. “But I just saw you leave Twilight’s house.”

“Nope,” the stallion repeated, nodding in commitment.

Shining waited a moment, viewing Big Mac and then the towering castle only a few paces behind him. “You know the door to her house is in leg’s reach, right? Like directly behind you?”

“Nope. Gotta go.”

Without another word Shining was left in a small dust storm as Big Mac galloped away, unmindful of the few wandering ponies he nearly knocked down. At the end of the block he readjusted his direction, almost collapsing a fruit stand. Shining had never seen the big guy move with such speed—or speak as adamant as then.

He thought, Whatever Twilight must be researching must be something top secret.

With a hoof against the knob, Shining entered Twilight’s castle.

***

“Twilight?” he called from the entryway. “What in Equestria did you do to Big Mac?”

Shining heard the sounds of running water as he entered the cozy living room opposite the kitchen. On the table were a series of tall, clear jars with labels on each. On each label were written two initials, the last one reading “B.M.” That one was close to three-quarters full with a white, translucent liquid. The jar right next to it was empty with a label waiting to be filled.

“Just a second, Shining!”

The stallion turned away from the table of jars and toward the small bathroom near the kitchen. The door was propped open ajar and he could hear his sister frantically brushing her teeth and gargling out water. It was cute how she still refused to let her mane down around him—even if she only wanted some help with her latest study task.

He regarded the thick liquid in the dozens of jars. “Are we doing some sort of paper mache project, Twilight?”

“I’ll explain in a minute!” she called, before he heard her briskly wipe her face with a towel.

A moment later she exited the bathroom and fixed him a warm smile, a small twinkle shimmering in both eyes. “I’m glad you made it, big brother. A little early though, I only just got through with Big Mac when you came.”

“I like to be punctual. You should know that. Seeing a lot of research ponies today?”

“As many as I can fit in. Make yourself comfortable on the couch.”

Shining edged toward the puffy couch and settled in the middle. He placed one hoof on the other, waiting for the demonstration or explanation that was surely to follow. Instead, Twilight levitated a white- and purple-striped sock to him.

He held it up for inspection. “A sock?”

“A test,” Twilight corrected, sitting awkwardly on the edge of a chair. “Slip it over your horn. I want to see if something I’ve been working on actually works.”

“All right.” Methodically Shining slipped the (hopefully washed sock) over his horn, making mental note that it nearly fit like a glove. When he had it down to his mane he waited a moment for something to happen. “So what should this do?”

She answered, “Try and move something with your horn.”

The white stallion searched the room before deciding on a book on a counter. He mentally flicked at it and discovered nothing at all was happening. “That’s amazing, Twilight! A device that stops the use of magic altogether! What do you call it?”

“Magic sock,” Twilight said bluntly, edging her purple rump from the chair and gingerly stepping towards him. “All right, before we start, I need you to relax and place both forelegs above your head.”

“Uhh…” Shining hesitated before lifting his legs behind him so they rested near the top of the couch. “Okay.”

Twilight was right in front of him now. “Now spread your legs a bit and come forward on the sofa.”

Although Shining trusted his sister wholly in the department of safety in the quest for all things knowledgeable, a small flicker of apprehension tickled his chest. Still he slid his butt down the seat, keeping his forelegs where they were. “Is this all—”

Swiftly, Twilight grasped both his thighs and shoved them apart, a stern expression of deft concentration on her face. She nodded. “There. That should work. Now all you need to do is keep still and we should have you out of here in no time.”

Shining’s apprehension only grew. “Why do I feel nervous all a sudden?”

“Because you’re not relaxing. I told you to relax.” She backed away a bit, admiring him in his oddly struck pose. “Comfy?”

The stallion thought blatantly, At least she said it’d be short. “Sure,” he answered.

“Good.”

Twilight lowered her head and directed her horn at him. She charged up a small purple and white ball that grew into a thin wave. One flick of the noggin sent it outward, where it hit every item in the living room, including Shining. Despite his best efforts, he grimaced from the sight.

Eventually he opened his eyes. “That wasn’t so bad.” He waited another moment—for some hidden after effects to come wallop every one of his senses. When he found none to discover he tried to sit up, only for all four of his legs to be held rigid in place. His head could turn from side to side and his torso could shove around the smallest of degrees, but he was fixed tight to that couch… and in the weirdest of stances.

“Why can’t I move?” he asked her, already fearful of the tiny smirk on her lips. “I think this spell’s been discovered already, Twilight. You might have to try something different.”

The alicorn shook her head. “No, it worked fine. This is only the first part. I told you I couldn’t have you moving around during our research.” Slowly she trotted between his drawn out legs, placing both hooves on his thighs. “Still comfy, big brother?”

Shining’s eyes bulged while his jaw tightened. “What are you—”

With relative ease, Twilight lifted herself towards his face, her breath warm on his splayed body. She stopped near his ear. “Tell me when you’re uncomfortable.” Then she carefully kissed one of his reddening cheeks.

“Now,” he said bluntly.

Delicately she plucked him a few more kisses, holding one side of his face with a free hoof. Her last one landed on his lips—lips that had tried their best to retreat back into his mouth.

“Now!” he exclaimed. She then pulled away to smooch longingly on his heated neck.

“Just making sure, Shining,” she told him. “I don’t want to start something unless we’re on the same page.”

She scooted off the couch and viewed him with a studious expression. Shining breathed out a sigh of relief that quickly turned into a yelp as his sister placed a warm hoof against his sheath. Once there, she rubbed it in slow circular motions.

Twilight looked as though she barely knew she was doing such a terrible thing. “The row of jars behind me contains several different samples of stallion semen. I’ve kept the process of collection with each as close to the same as I could—the difference between them is their relationship to me. I’ve collected from complete strangers; from friend’s relatives; from close friends here in Ponyville; but the only sample remaining is from one of my own siblings. Which is why I asked you to come today.” She paused. “I mean come here today.”

During her speech the gentle motions around his groan sent small shivers of pleasure to the stallion. His mind was a flurry of horrific thoughts, the largest being that his very own sister was touching something she shouldn’t have even been near. But another—far more pressing concern—was that things were starting to move and harden underneath her carefully moving hoof.

Shining had to think fast before he’d never be able to look at his sister the same.

Unless… he thought.

“Queen Chrysalis, I presume!” he shouted to her in his most heroic of tones.

Although the Twilight-impersonator did not blanch from his clever deduction, he could see her face contort in confusion. Her busily moving hoof had now found a few inches of workable length to slowly stroke from the base. Shining forced himself to ignore the newfound wave of small pleasure.

He continued regardless of his hanging ponyhood. “You thought you could mask yourself as my sister and sour her good name! Any moment now and I’m sure she’ll return to triumph over you! Your original plan at my wedding might have won me over for a time, but your latest plan won’t even get off the ground. Surrender now and I will see you live to plot another day!”

The Twilight-impersonator slid her other hoof under his balls to rhythmically tease them up and down. The other hoof had worked his member close to full attention, before carefully sliding along every last inch that had previously flopped onto his stomach. Every few strokes, she’d stop near the tip to crease every soft nerve. Already a small bead of white was resting on his head.

Ignoring her—ridiculously—pleasurable work, the Twilight-impersonator lowered both brows and glimpsed the near panting stallion above. “Why would Queen Chrysalis ever bother with stallion semen extraction? She wants love… not that kind of love, Shining.” She shook her head. “Sometimes I wonder how we’re related…”

Shining’s entire length was close to throbbing. The hoofs working under his length and cupping his balls pulled at both large objects playfully. The other hoof gripped the top of his shaft to rub right on the tip. The usually white-faced stallion (but now very red and white-faced stallion) gulped dryly.

He viewed his sister with pity in his eyes. “Please say you’re Chrysalis… or a changeling… or something that isn’t my sister!”

She shook her head. “Sorry, Shining. That’s not the case this time. But we’re almost there. So sit back and relax and if you really want, just pretend I’m Cadence or something.”

He mumbled, “Cadence hasn’t done anything like this since the wedding.”

“Then I guess that makes me a great sister.”

Twilight levitated a small band with her purple aura and swiftly slid in down his member to the bottom. Once there she let it go and it tightened around, constricting the blood and making his long member throb with each heartbeat. With that done, Twilight took a second band to tie her hanging mane back. She opened and closed her jaw in large stretching motions.

Gripping his solid length between both hooves, she brought the tip close to her mouth to playfully lick. With the oddest of sensations, Shining watched as his little sister swallowed the small drip of cum from the end of his shaft. Something inside him died at that moment—while something far more perverse awakened from within.

“Tell me when, Shining,” she said, staring intently. “I don’t want to miss a drop—that would only ruin the experiment.” Then she wrapped her limber lips around the first few inches of his penis, tongue first wrapping around everything it could.

Shining’s chest beat away like a heated stove. He flung his moveable head to the back of the couch and tossed it from side to side. It was all too much. Much too much.

“Please tell me you’re not going to swallow!” he blurted, such words tasting like dirt on his tongue. “Please don’t, Twilight! Please!”

She removed her working mouth from his slick member, a wet plop! sound as she did. “Don’t be gross, Shining. I’ve created a spell that once your seed reaches a certain part in my throat, it’ll be directly teleported to the empty jar on the table.” She rolled her eyes. “This isn’t for fun, Shining. It’s for science!”

She lowered her head to his shaft again, forgoing the first few inches to devour all that she could muster. The muzzle on his sister only added to the experience, as she could take close to half of him before his tip would bounce against the back of her throat. With her two empty hooves, she ran them along the remainder of his shaft, working in horrific tandem with her bobbing head and sucking mouth.

She’s had practice, the now sweating stallion thought. She had all morning to practice.

Unwillingly, Shining returned his reddened face to the cool confines of the headrest on the couch to twitch uncontrollably from the actions below. Although he wasn’t watching what was happening, each fast and wet sound met his ears and each brutally wonderful sensation claimed what righteousness he had originally held claim to since he’d entered Twilight’s home.

Until Shining could barely contain his soft moans (ones that sounded sadly close to whimpers), his little sister worked away on his hard member, shoving more and more of his warm and pulsating length into her tightly sealed maw. While one hoof stroked near the base of his penis, another rediscovered his wide pouch sitting idle on the couch, caressing them as softly as a lover’s kiss. And just like that it had become too much.

Oh Celestia, he thought. No, please no!

Finally he pried himself from the couch to watch his busy sister—his member about to erupt from the weeks of inactivity back at the Crystal Empire. He told her bluntly, “You will not get what you want today, Twilight. You can try until you’re blue in the face but I’ll only leave you disappointed. So stop now and we’ll forget all about it.”

He gritted his teeth as she unhooked her mouth from him, her hooves still running up and down his length, keeping him going. Such a lie, he thought. Such a flimsy lie.

Twilight looked unperturbed. “Now you’re being silly, Shining. When it comes to science and everything book-tacular, I always get what I want. Now stop talking; I know you’re close and I’d like to finish before the next appointment arrives.”

“But—” was all Shining could blurt, before the warm and wet lips of his kid sister found the remainder of his shaft. Forgoing her original strategy that had already placed him close to ecstasy, Twilight doubled her efforts, speeding along his penis in hurried and rough intervals. Both hooves returned to the lower half of his shaft, tightly pulling at what was barely held within. He watched as she lit her horn, before feeling his balls coated in a thin aura, squeezing and loosening. Obviously Shining knew what his sister was after.

As much as he wanted to retreat from the sight, he found himself locked on the act. Nor could he shut his eyes to pretend it was only Cadence treating his body in such a miraculous manner—no, it was his younger sister and Shining had never thought something so sickening could tug at his up-until-then innocent arousal in such a way.

But no one will know, he tried to reassure himself, as he first felt the hints of the outward explosion. Unless she publishes the results. Would she? Oh Celestia—

Shining was instantly torn from his thoughts as Twilight unfurled her wings to wrap around the edges of his plot. Matching the speed of her bobbing head, she lifted him from the couch to smash into the back of her throat. Even though Shining from that day forward would never admit to such an act, he sadly thrusted right along with her wings, wanting to push himself all the way inside her warm and wet jaw.

“Oh crap…”

A few seconds after she had added the wings to the procedure, Shining shut his eyes while his hips locked in place. When he began to cum inside her, Twilight grabbed the sides of both legs to hold him in place. As each large and heavy load spewed out, his legs twitched from the overwhelming sensation. Head slamming into the couch, he silently moaned as each hot load was greedily accepted by the still latched on alicorn.

Every shot was followed by a near choking swallow. If Shining hadn’t been busy riding out the largest orgasm of his life, he might have even been proud, as his own batch of semen first flew into the empty jar from a small purple aura at its top—already tying with Big Mac’s amount, before shooting a good centimeter above.

“Ugh.”

When he had been dried clean, Shining collapsed back to the couch and felt each sweaty limb return to his control. Even though he had merely sat and watched as someone else rode him out harder than he could believe, he could scarcely remember a time when he felt more horrifically winded. With heavy eyes he watched Twilight get to her hooves, twisting her neck and wiping at her mouth as she did.

“See, that wasn’t so bad, was it?” she asked, fixing him a grin that didn’t little to salvage the situation. With her horn she removed the magic sock from his head and flung a towel onto his damp chest. “Clean up quick, please. My next subject should be here soon, and I would hate to greet them looking so disheveled.”

She spun, and right before exiting the room set a new jar on the table with the rest, before labeling the freshly filled jar with, “S.A.” in thick black marker.

Nerves still shaking from the experience, Shining hastily ran the towel over his wilting member and other moist regions. Then he got to his hooves and wobbled in place.

From the bathroom he heard Twilight start the sink while she brushed her teeth vigorously. She even hummed as she went.

And now I try and forget this ever happened, he thought, as he stumbled towards the entrance.

A moment before touching the knob, the door swung inward and a familiar sight greeted him.

“Hi, Shining. Did Twilight want to see you today too?”

Shining closed his eyes and brought a hoof to his temple, suddenly curious about the current costs of therapy sessions. He finally said, “Hi, Dad.”

I Demand That You Stand Down!

“And that was when my dad walked in,” Shining Armor said while staring at the many framed diplomas on the wall, head resting against the hard leather couch.

His therapist sitting out of sight jotted down a few lines with a quill. “And did you warn your father about what was going to happen to him?”

Shining shook his head. “I should have—I should have stopped it all—but I only wanted out of there. So without another word I bolted out the door and up the street.” He sighed. “Second pony to leave Twilight’s like that in one morning.”

Out from view he heard his stallion therapist mumble his agreements and write something new. As well as some other sound. “Maybe your father will need to visit with me one of these days. I would love to hear his side of the story.”

“I haven’t spoken to him since,” Shining said. “I don’t think he’d admit anything.”

Shining furrowed his brow as he heard that odd sound again. Like some gentle patting.

His therapist asked, “Why don’t you tell me exactly what happened between your sister and you that day? It could be the key to unlocking the unseen emotional scars you may carry inside you.”

“But why?” Shining blurted. “I already told you all about it! Twice! I don’t think reliving it is going to help me move past it!”

“But maybe if you only went into more detail about it, Shining,” his therapist said coyly. “How you felt; how your sister looked; what was running through your mind while it was all happening.”

“That’s all stuff I’ve told you before!” Shining shouted, before hearing that soft slapping sound again.

Pat-pat-pat-pat.

His therapist didn’t notice his noticing. “Could you at least tell me if your sister had any residue on her face when she finished with her experiment? That would be a valuable piece of information, I believe.”

Pat-pat-pat-pat.

Shining grit his teeth and closed his eyes. That sound couldn’t possibly be what he thought it was. “Are you masturbating right now?” he asked bluntly.

His therapist laughed it off. “Don’t be silly, Shining. I’m just tapping my leg against the floor—it helps me think. Now please go into immense detail again about how your sister forcibly sucked you off before storing your cum in a jar. I think the more time you spend talking about it, the better.”

“Argh!” Shining climbed off his couch facing the wall and regarded his red faced therapist who held a large clipboard in front of his stomach. Sadly it wasn’t tall enough to completely conceal his throbbing erection. (He at least had the graciousness to stop once he’d been caught.) “You’re masturbating during a therapy session?”

His therapist viewed what lay underneath his clipboard wearily. “Maybe?”

A spill of warmth entered Shining’s face. “What’s wrong with you? You think incest is arousing or something?”

His therapist didn’t meet his eyes. “Maybe?”

“What? So you’re saying forced relations between a brother and sister is something to get your jollies off? That’s just weird!”

His therapist didn’t move his clipboard. “But didn’t you admit at one point, Shining, that you too, were aroused by your sister’s actions?”

“I…” Shining choked on the words. “That was different… and I don’t think…” He didn’t know how to finish his thoughts.

His therapist raised a curious brow.

“Screw you, you nut-ball!” Shining said as he trotted from the room. “I’m done with these sessions. Can’t believe I spent so many bits to hear some pony slap his meat!”

His therapist raised a hoof. “One more question, before you go, Shining.”

Shining stopped in the doorway and rolled his eyes. “What?”

“Is your sister still looking for research subjects?”

Shining then slammed the door on him.

***

In a huff, Shining walked along the crystal corridors, suddenly wondering how long it would take the Empire to hire a new therapist. The only thing lifting his spirits at the moment was what Princess Cadence had said to him that morning—or visibly insinuated, with the way she bent over and ate her morning banana in one single, very drawn out swallow. While she nearly deep throated that very lucky fruit, she had met his eyes and didn’t even flinch as he dropped his hovering spoon back into his forgotten cereal. The next thing she did was whisper into his ear exactly what he had been waiting to hear since getting back to the Empire from visiting Ponyville.

“I want you all to myself tonight, Shining,” she had said softly right above his flushed cheek. “Remember all the things we did on our honey moon?”

Just from that thought alone something extended from Shining’s lap and nudged the underside of the kitchen table. He hurriedly nodded his head like an excited filly.

“I want to do that,” she continued. “All night long. So save your strength, my great big stallion.”

Shining had briskly nodded again and watched with breathtaking detail as Cadence slowly trotted from the room, perfectly rounded plot deliberately swaying from side to side. She even shifted her tail every few steps to give the panting stallion a clear view of the treasures beneath.

“Oh damn,” Shining had said to his unfinished bowl of soggy oats. It would be a few minutes at least until his member stopped bumping against the underside of the table.

***

It had been a full week since his all-too-close encounter with his sister and things at the Crystal Empire seemed about as ordinary as ever. Both Shining and Cadence came to bed more tired than they could believe and a simple peck on the cheek would need to satisfy for the night. Their love making at the onset had been frequent and intense, but as the grind of running a full Empire came to envelop both of their lives and most of their energy, it had steadily wilted and grown stagnant. And now suddenly Cadence wanted a romp in the sack? Shining was curious. Excited too, and yet…

Could it have something to do with their conversation that first night back?

“What’s wrong, Shining?” she had asked him that first night back in bed. “You don’t look the same since you arrived? Did Twilight’s experiment not turn out?”

“It… did.”

“Then did it make you feel ill?”

“Yes. Absolutely, yes.”

Although Shining had made a silent promise to himself never to divulge what transpired between Twilight and him, Cadence eventually wormed out each horrific detail. He knew it must have affected her terribly, for during his long story she bit her lower lip in distain while her breathing became labored. At one point she even slid a hoof underneath the covers, most likely to rub at her aching stomach that must have been troubling her upon hearing of Shining’s incestuous tale.

When he finished, she curled up beside him and ran an oddly wet hoof along his chest. With sparkling big eyes she glimpsed him. “Do you think she’d ever do something like that again, Shining?”

Shining shook his head. “I don’t think I could ever be alone in a room with her again, if that’s what she was planning on trying. She caught me unawares the first time, Cadence. If she tries again I’ll be ready. I can only hope it was actually all for science… and not something else entirely.”

Cadence suddenly swung out of bed.

“Where are you going?” he asked.

Cadence ran a hoof along her mane. “Your story got me so hot and bothered… I mean, just bothered, that I thought I’d write a letter to someone to calm myself down. And no, it won’t be about what happened to you, Shining. That’s our little secret, I promise.”

Tired and emotionally fragile, Shining went to sleep that night and honestly wondered if his Crystal Empire could somehow be fortified from horny purple alicorns.

***

The beautiful sun seeped from the sky and with an added spring in his step, Shining made his way to the couples’ bedchamber. Locking the door behind him, he heard Cadence ruffling through clothes in the walk-in closet while he eyed up the large, lavish bed at the very center of the room.

Only now it was the oddly bare bed, complete with golden metal posts at all four corners. “Cadence? Did you remove all the bed sheets for some reason?”

“I did!” she yelled from the other room. “I wanted to see everything tonight, Shining! But I left the pillows!”

That she did, he thought blankly. A mattress and two pillows. Something big is about to go down here.

Shining sat on the side of the bed and clapped his hoofs together childishly. He could hardly sit still.

“You ready, my prince?” she called to him.

“I was ready four months ago,” he mumbled, before answering, “You bet!”

Seductively, Cadence extended a single leg out from the closet—a satin white sock extending halfway up her leg. Slowly following that was the rest of her delicate frame, a thin red pair of panties covering up a small portion of her plot. She eyed him hungrily as she steadily crossed the room, licking her lips and flipping her mane every few steps. Whatever had sparked this new energy, Shining was happy to see it.

“You look—” he began, but already she shoved her muzzle into his, wet tongue invading his mouth while pushing him backward. After a moment of this Cadence pulled away to kiss at his neck and whisper, “Lay down, Shining. You deserve a treat.”

Shining didn’t waste words or air, only did as he was told. Once splayed out he watched with widening amazing as the lean pink alicorn found the first few inches of his shaft which she instantly placed in her mouth. Only a few seconds later did the rest of his member come out to greet the welcome discovery—already hard and nearly aching.

“Oh Cadence…” he moaned.

With added room to play, Cadence got to work driving her mouth as close to the center of his penis as she could. She angled her head so the tip started down her throat—creating a slick gurgling sound. When she noticed her husband nearly panting on the mattress, she worked both hooves along his chest and thighs, holding him in place. After a few minutes of this, she removed her mouth to lick around the tip of his shaft and eyed him with blushing cheeks.

“You enjoying everything so far, my sweet?” she asked playfully, obviously enjoying the sight of barely contained stallion.

“You’re amazing, Cadence,” Shining panted. “You’re almost as good as Tw—”

Shining grit his teeth and both eyes flew open.

Cadence soft and warm tongue continued their sensual assault unabated. “What was that, Shining?”

Shining felt his heartbeat quicken. “Nothing. Just about to say you’re almost as good as I remember you were on our honeymoon. That’s all. That’s totally it. Bravo. Good job.”

Cadence smiled at him. “That’s nice of you to say. But there’s something else I wanted to try tonight.”

Overwhelmed by his wife’s continued rediscovery of his penis, Shining only shut his eyes and said, “Whatever you want, Cadence.”

“Okay. Great!” she chirped.

Click!

Click!

Click!

Click!

Shining felt four thin bands of metal slide across each outstretched leg and hurriedly tighten. He lifted his head from the pillow and found every splayed limb clamped down tight by a pair of hoof-cuffs, each attached to one of the four metal posts along the bed.

It should have been arousing. Yet it only reminded him of the incident a week ago.

“Uhh… Cadence?” he squeaked out.

“Yes?” With her horn she removed her thin panties and curled up to his shaft, sucking and tonguing the tip while both hooves rubbed up and down what remained.

He said timidly, “This seems a little much, don’t you think?”

“I said I wanted to do what we did on our honeymoon, sweetie. Don’t you remember?”

Shining mumbled, “I must have been pretty drunk, because I don’t remember this part at all.”

“I remember clearly, Shining,” she said honestly, kissing the dab of cum already on his tip. “You enjoyed every minute of it and so did I. And you even enjoyed this.”

A length of black cloth was set over his eyes and tied behind his head. Already about to comment about his sudden un-comfortableness, every word instantly dried in his throat.

“You ready, my love?” Cadence cooed from the front of the bed.

Shining felt his wife move away from his penis as she positioned herself above him. A moment later she set her wet slit to rest on top of his member. She gently lowered herself a couple of times, caressing both excited puzzle pieces and teasing the poor stallion even more.

“I am more than ready,” he finally answered stoically, completely forgetting how distressing he had originally found the cuffs and cloth.

Cadence lowered herself down, pressing her pussy against his hard shaft until the tip finally nudged itself in. Shining moaned from the sudden warmth and felt his wife’s tight honey pot claim the next few inches before retreating and then slamming back down. The wet walls of her interior tightened and pulsated against him, gripping every last inch. It had been so long since they’d made actually physical love that he almost forgot just how tight she was. He was a lucky stallion, no question about it.

“Gah!”

Cadence came down hard on him again, mashing more of his long length into her dripping slit. He had remembered her being tight, but never this tight.

He said between heavy breaths, “I almost forgot how compact you were, Cadence.”

“Awe, that’s very sweet of you to say, Shining,” Cadence said, from some spot a little too close to his head, as in… behind his head, which was in fact physically impossible because she was indeed still busy riding his dick near the front of the bed, right? But alicorns are capable of many tricks and wonders. But why would she…

Shining said slowly, “Cadence?”

“Yes, Shining?” she said to the left of him.

“Are you on my penis right now?”

“I’m afraid not.” She pecked his cheek. “But someone very special is.”

Cadence removed the blindfold and with more horror than could properly be described, Shining Armor glimpsed Princess Twilight Sparkle riding his shaft like a new found toy. With both backlegs keeping balance, Twilight kept a single hoof against his chest while the other one rubbed against her clit. Clearly she was enjoying herself.

“Hey, big brother,” she greeted with a smile. “How am I doing? I really haven’t done this all that much and you’re definitely the biggest so far. I’ve never felt so full.”

Both of Shining’s eyes glazed over and he even returned the grin. It was easy to do, because his brain had effortlessly decided on a less aversive avenue of thought. Almost like meditation. “I must be dreaming,” he said casually. “I must be sleeping right now and this all just an occurrence due to physiological scarring. Soon I will wake up and then I will take a cold shower while I completely forget about all of this.”

The busily riding Twilight lowered on her haunches and discovered more room to drive the stallion into. Shining could not recall his member ever being in a tighter location—or a dream ever appearing (and feeling) so real. Then he came to another conclusion.

Calmly he said, “I can only surmise this all means I’m dead and in hell. Too bad. But I guess I had a good run. Now if some devil-pony could only pop out and start stabbing me with sharp objects, I’d enjoy that a lot better than this. Please and thank you.”

Cadence’s loving face entered his vision as she kissed his unmoving lips. “I thought you’d consider this heaven, Shining. I know I am.” Shining could plainly hear his wife rubbing away on her unseen wet clit. “Two alicorns in bed? Enjoy it, sweetie.”

“One of them is my sister,” he told the dream/hell version of Cadence.

She licked along his neck to his ear. “And that doesn’t turn you on just the itty-bitty slightest bit?”

Panting and sweaty, Twilight collapsed to his chest to ride him from there. Somehow since starting, she had warmed her way to taking nearly every inch of him. He was almost impressed. Except for one glaring detail.

“What’s wrong with everyone!?” he screamed, once the notion of dreams and hell eventually vacated his head. “This isn’t right! You should know this isn’t right! First off: this is rape! Secondly: this is incest rape! I can’t be the only one that has a problem with this!”

“I only wanted to try something different, Shining,” Cadence said, wrapping a loving leg around his heated head.

The kind gesture did little to quell him. “Something different, Cadence?” he yelled. “We could have tried the paddles, sure! I would have done that! Even the Sombra cosplay—we could have done that once! But this is very, very, very, very, very different than that! Very!”

Cadence’s hoof patted his cheek. “You’re right. This isn’t fair. Let’s take a vote. All those that want to continue?”

Cadence raised her hoof along with a panting Twilight’s.

“All those that want to stop?”

Shining tried to move a single one of his forelegs. Neither would budge.

She patted his cheek again. “So sorry, Shining. Two against zero. You really should have voted.”

“Gah!” Shining screamed, before directing all of his rage and attention toward his warm and wet member. “Penis! If you can hear me, I demand that you stand down! What you’re being subject to is dirty and immoral and I won’t be able to look at you the same if you decide to cum in my sister today. So cease and decease immediately!”

With odd pride, Shining felt his member lose the smallest bit of its hardened edge. Tired from the continued act, Twilight slowed her thunderous rhythm on top of him.

Cadence sat down on the pillow next to Shining’s head, one leg wrapped around him while the other one rubbed against herself. “Oh no you don’t, my big stallion. I didn’t want two-thirds of a show; I wanted the whole thing.”

She directed her long horn towards his middle, where he instantly felt his testicles tighten while a new batch of blood rushed to his shaft. To make matters worse, he then felt his buttocks rise off the mattress and thrust with outmost force into his sister. It almost left like two helping hooves pushing him into her tight slit over and again.

Twilight was nearly drooling against his chest. “You’re the best BBBFF I could ever ask for, Shining.”

From outside the window Shining heard the snapping of some tree branch. It either must have come from there or from inside his own head.

“No. No! No!” he screamed. “Stop it! Stop it, please! I beg you! This is sin! This is sin! It’s a sin, it’s a sin!”

“Sin? What’s all this about sin?” Cadence asked openly.

“That! Using Twilight Sparkle like that! She did no harm to anyone. She just read books!”

“Are you referring to the purple alicorn currently bouncing on your dick?”

“Yes!”

“You’ve met her before?”

“Yes!”

“So, you’re keen on having relations with your sister?”

“No!”

“Can’t be helped, Shining. It’s too much of a turn-on to be stopped.”

The magic hooves against his flank increased their ferocity as nearly his entire shaft was gobbled up by Twilight’s taut lips. Shining had been near the edge since he’d thought Cadence was about to mount him, now he was about to fall over it.

“Whose idea was this!” he demanded as he barely hitched in quick batches of air.

“Twilight’s actually,” Cadence said with a moan. “I only wanted to hear the details, but she convinced me to try something new. I’m so glad she did, too.”

Shining fixed his hardened glare to the sister laboring to breathe against his chest. “You will not know when, Twilight Sparkle, but I will have my revenge on you. Not today. Not tomorrow. But soon you will find the tables turned and I will bring swift and hard justice to you. Just because you’re an alicorn doesn’t mean you can get away with stuff like this. And I know where you live!”

“Of course you do, silly,” Twilight said happily. “You and Cadence are stopping by next week for vegetarian lasagna.”

Shining thought for a moment. “Then sometime after next week, I will bring swift justice to you and you will feel the—”

“You’re killing the mood, Shining,” Cadence cut in, before she pulled his head to hers to stick her tongue into. Inside said mouth he still verbally protested, but no words could stop Cadence’s magical increased push on his plot. Less than ten seconds later it all came to a close, as he felt thrust after thrust of gooey material leave his shaft and enter his little sister. Cadence had squeezed out every last drop and soon Shining felt the warm runoff on his stomach that had exited the gasping Twilight.

And now it was official.

He had cum inside his sister twice in eight days.

When both sweaty and tired alicorns collapsed to either side of him, he told them bluntly, “I hate you both so much right now.”

Cadence only smiled. “Your brother can be such a grump sometimes, Twilight.”

Twilight laid her weary head on his shoulder. “I know. But he has a heart of gold. And the second best cock in Equestria.” She paused for a moment. “Break for tea and then round two?”

Cadence giggled. “I did say all night, didn’t I?”

Right above the awestruck stallion, the two alicorns bumped hooves.

Author's Note