Author's Note

Warning: This chapter contains: Non-consensual sex, violence, incest, implied offscreen death.

Wyrd Science

By now Shining Armor's trips to the underground chamber had become a ritual. Normally he woke up early to make himself the best Captain possible for his soldiers; now it was in anticipation for whatever mare he would bed next. Of course it wasn't unusual for his wife to wake him up with a slow blowjob that brought him to the edge before he finally stirred, but to her disappointment she couldn't do that all the time since it would leave him rather drained.

The blindfold came off once he reached the bedroom. The twin maids bowed low and made their exit. After several minutes he tapped a hoof and started to pace about. He wished they would leave some porn here to work him up. Before he knew it an hour passed without incident.

"What's the hold up? Don't tell me I'll have to head home with a serious case of blueballs..." Not that he'd let that happen. The maids about the palace that were chosen by Cadance were always up for a bit of casual sex, the sole condition that they kept it discreet from the citizenry.

They'd giggled when he'd stuck away with some of them, taken them against a wall, over a table or railing, the thrill that they could be caught a powerful aphrodisiac. Granted he figured his fellow soldiers were aware, but they were too loyal to do more than simply cast him a cocky smile.

A rather smug and familiar voice called, "Why don't you lay back on the bed? I'll handle you soon." With a shrug he did as instructed. "Now spread all your limbs wide." He relaxed and splayed himself across the velvet sheets, staring down at his sheathed meat and balls.

Suddenly bindings emerged from all corners of the bed, and immediately seized around his extremities just under his hooves, binding him into place within an instinct. "What in Tartarus...?!" He growled and cursed and struggled helplessly, felt the bonds tighten even further.

A smirk painted Trixie's face when she trotted before him. "Well, well, well, what have we here? A handsome stallion completely at my mercy? Whatever should I do with him?" A cape fluttered behind her when she moved closer, face partially obscured by the wide-brimmed hat.

She crawled atop him, planted delicate hooves upon his chest, nearly straddled him. Her snout brushed his own. He felt his loins twitch a bit, smelled her sweet perfume. Her horn glowed when she used her magic to poke at his dick. "Naughty," she mused as it immediately flared to life.

Shining Armor felt like such a dope. Of course he could use his magic to break free at any time. This was simply one of her silly games. He'd let the sultry witch take charge for a while, let her think she was in control, before he broke free and put this cocky mare in her place with his cock.

Gradually she lowered herself with legs spread wide, until his shaft kissed the closed lips of her slit, until a bit of moisture dripped down his length. She grinded his dick in slow and deliberate rhythms that made his precum dribble and mix with her slippery feminine excretions. He strained and bucked his hips, desperate to enter her. She cackled maniacally.

"You're so easy. Too easy. Just like all stallions, you're a slave to your penis!" She leaned forward and took his horntip into her mouth. He shuddered with pleasure, and didn't even notice the sleight-of-hoof she did with ring, which she inserted into her maw. He moaned low when her snout swallowed his horn to the base. Sparkles exploded in her mouth and tickled it to the throat.

The ring was placed about the base and immediately constricted tight into place. His magic shut down in an instant. "What the-?!" He'd heard about such neutralizing devices, but they were supposed to be banned, since they practically rendered a unicorn helpless.

"Buckle up stud, because you're gonna be my bitch tonight!" She adjusted her groin and forced the entirety of his length into her folds with a pleasant full-bodied shudder that made her eyes roll into her head. "Fuck, it's so rare I meet a stallion that can fill me like you!" The bed creaked as she started to move her hips and bounced atop him. She brushed her squishy mounds over his torso.

"Y-you damn bitch," he whined with hate-filled eyes. He continually strained against his bonds to no avail. "Whenever I break free I'm-" He snarled. "I'll rape the absolute shit out of you!"

"Idle threats. Glad to see you're being a little more honest with yourself now, at least." She heaved and continued to ride him senseless. "You can't feel like a real stallion if a mare is on top!"

She lit her horn and cast a spell she'd devised and practiced for such an occasion. She x-rayed her insides to make her uterus, cervix, fallopian tubes, and ovaries visible, allowed him to intimately see his cock pushed in-and-out of her moist love tunnel. Her nethers started to suck on his shaft.

He grit his teeth and sweated in a futile attempt to hold back his building orgasm. "F-fuck..." The harder he tried to hold back his inevitable release, the more he whinnied and whimpered.

She slammed the entire weight of her hindquarters down on him, until he bottomed out in her, his stallionhood smushed upon the entrance to her cervix. Crazed eyes matched a salacious smile. "Cum for me bitch!" He cried out helplessly and watched his sperm shoot into her entryway. Strands of his hot and dense seed flooded into and filled her to such excess it sputtered free.

The sight of his ejaculation inside her aroused Trixie to such an extent that she came with him, a shrill scream of celebration escaping as she squirted with such force and volume it splashed all over him. Juices splattered his abdomen, torso, and face, the taste a salty-sweet mixture.

Her cunt continually milked his cock dry. "Oh, I can't wait to have your foals!" Her face was completely flushed. "Imagine the look on Twilight's face once she realizes you impregnated me!" She mischievously tittered and slowed the movements of her shapely hips to a reluctant stop.

His sweat-soaked muscles heaved as he watched his potent sperm settle inside her insides. Whatever witchcraft she had worked enabled him to see the tiny creatures swim about. A lone soldier battered down the barriers to one of her eggs and fertilized it. She squealed cheerfully and slowly pulled his wetted stallionhood from her marehood with a plop. "I've never been a mother before!" She planted both hooves on her somewhat rounded belly and lazily stroked it.

She used her psychokinesis to scoop his spunk out of her, opened her maw and tossed the wads in, which she swallowed down slowly with an audible messy slurp. Next she turned around, and lowered her now clean pussy to his face. "Ready to worship the Great and Powerful Ass?!"

"Don't you dare-mmmph!" His demands were cut off once her wide and supple buttocks smooshed as they settled onto his face. Her vulva and ponut parted a little upon contact.

He hated to admit it but he was practically in heaven. His shaft was quickly at attention once more, especially when she started to shift her hips, her folds parted until his snout sunk into her unbelievably soft wet crevice. She took his massive dick in her mouth and dreamily suckled on it.

Rather than fight it any longer, he lapped at her slimy nethers, and she shifted positions ever slightly, so that his horntip sunk into her sphincter. He trembled and managed a muted moan as her back entrance contracted about his unicorn pride. She pressed down her hindquarters harder onto him, until his mouth and horn were fully sunk into the mare. They pleasantly wheezed.

She picked up speed. Bobbed her head up-and-down faster-and-faster. Took him to the base until his shaft left a thick bulge in her throat. His muscles tightened as he felt a second orgasm start to build. While he wasn't able to move his hips much in this spread eagle position, he bucked hard against her mouth when he came, her eyes widening in surprise as his viscous foalbatter puffed her pinkened cheeks to fullness and erupted like an angry volcano from her flared nostrils.

Instead of resisting she simply accepted his powerful seed, and her nethers quaked as she came with him, her marecum a flood that washed over his face and into his mouth. He drank it down.

Afterwards they rapidly exhaled in a shared afterglow. A bubble of magic suddenly enveloped her, and she was casually lifted off Shining Armor, carried away and left to float a short distance from the bed. She tried to counteract the spell only for the neutralizing ring to vanish from his horn and reappear upon her own. "How in the-?!" Likewise she suddenly found their places traded in a brilliant flash, only she was placed belly down with her ass and pussy presented to the world.

He was delicately placed back on his hooves. A small shadow fell over them as he turned back to see the newcomer. "T-Twiley...?" While they had seen each other's privates thousands of times, it had never been in a context like this. He instinctively wanted to cover his still wetted and partially erect nethers but felt that would somehow make the situation even more perverse. "Uh, h-hiya!"

Twilight Sparkle smiled at him. "Hope you've been having fun, B.B.B.F.F! I know I have!" She narrowed her eyes at the blue unicorn. "But I think it's about time you lived up to your word and put the Fake and Pitiful Trixie in her rightful place! She's totally helpless, you know!"

He swallowed. "Y-you expect me to, um, perform in front of you? I can't do that!"

She cantered over to him with her chin raised. "You have to. For science! I want to see firsthand how the potions I helped concoct effect a stallion and mare."

"But we're brother-and-sister for Celestia's sake! I don't want you to see me, um, do the deed firsthand!" He blushed furiously. "Why do I have to be involved, anyhow? There are plenty of stallions you can run a test on! heck, I'll pick one out from one of my soldiers!"

Twilight shook her head. "No. It has to be the absolute best specimen possible and there isn't a male unicorn on your level in Equestria. Besides, think of this as an anatomy lesson." She casually looked over his nethers which made him shyly clamp up. "Any supposed perversion is all in the mind. Just take it casually while I scribble some notes. Remember, Equestria's at stake!"

"That's a low-blow, Twiley. Using my commitment to my duty against me. You really do know me better than anypony. Well, other than Cadance maybe." That's the sort of relationship they could never share. Nor did he want to. He hated to even think a stallion would breed her someday. Whoever the lucky colt was had better treat her like a Goddess or he swore to beat the shit out of him. He swallowed hard. "Can't we simply record this instead?"

Instantly he regretted the suggestion. Somehow the idea of making a cheap homemade porno his sister could watch at her leisure seemed infinitely worse. At least he could finish this quickly. "No, I'd rather see this play out naturally." He breathed an ambivalent sigh.

Trixie sneered back at them. "Enough of the stupid sibling rivalry, don't I get a say in this?"

"No," the pair shouted in unison. The witch cowered submissively before their shrill yell. He slowly advanced on Trixie and lined himself up to mount her. She shuddered and whimpered for mercy as his titanic form cast a heavy shadow over her helpless frame. Despite the circumstances, seeing such a beautiful mare rendered helpless before him made his dick quickly harden.

"W-wait," she pleaded with droopy eyes and cowered at the massive rod of meat which was about to be forced back into her. Somehow it seemed thicker and wider than ever. Was it simply all in her head or had it somehow expanded? It twitched. Droplets of precum fell on her buttcheeks.

While the physical need was certainly there, he needed to work himself up to motivate him, otherwise he'd never be able to perform in front of his sister. He reminded himself of all the trash talk she'd ever hurled at him, how he'd tried to hurt his little sister and even ravished him. He snarled. "Remember what I promised earlier?" He brushed his flared cockhead over her swollen outer labia. "Well my cock's ready to wreck that pussy like it's never been wrecked before!"

She whined and turned beet-red when he mounted her. For a moment he even forgot his sister was there as her folds gave way and reluctantly welcomed the intruder inside. She moaned low and dripped and her marehood instinctively winked even as her eyes watered.

He ripped the cape from her for a better view, slapped the pointy hat from her head, grunted as he sunk all the way into her bright pink funhole. He grabbed her mane with a hoof and her tail between his teeth. Her buttocks jiggled as he bucked into her hard as he could. His stallionhood battered her cervix and she shrilly cried out in response. But that simply encouraged him to hit her faster and harder. Her entire frame quaked in a mixture of pain and pleasure under his powerful thrusts.

His audience was now completely forgotten. A rage he didn't like to admit, let alone show came over him. Whenever someone threatened or insulted his wife or sister a certain darkness overtook him that betrayed the noble image he liked to project. "Is this what you wanted, you sadomasochistic slut?! You want me to rape you into submission and make you my bitch?!"

He bristled when his sister traced a hoof over his muscular back. She slapped his sweat-beaded muscular flanks to make him buck even faster. "That's it, ride that tender piece of meat until she collapses!" He shivered as he noticed her shameless leer and wondered what the heck was wrong with her. This was a side of her he'd never seen before. Not that he could really talk. But he liked to think that she was a complete innocent. That she lacked a perverse side unlike him.

Momentarily he snapped back to reality and wondered what had come over him. He'd never do this to another pony, not even one he had a love-hate relationship with. It's like a spell had come over him ever since Twilight Sparkle entered the room. But that was ridiculous.

It was too late to turn back now. Better to simply be done with it. His bucks slowed as he settled into a mechanical rhythm. Unfortunately the slow strokes only teased his penis even more, and he was ashamed as his face twisted into lewder and lewder expressions, which his sister tittered at as she relished the erotic show he reluctantly put on for her. "Oh...ah...I'm...I'm about to-!"

Without warning Twilight suddenly yanked his cock loose, and rapidly jerked it off between both hooves. He shouted, "Twiley-!" But he couldn't hold back the flood now and his body otherwise froze up as he showered Trixie's asscheeks with thick strand-after-strand of his foalbatter.

Twilight smacked the mare's ravished backside hard. "That's right, you don't deserve to have any more of my B.B.B.F.F.'s mana inside you!" She directed his cock to wipe the excess upon the pair of blue buttcheeks. "You're nothing more than a filthy cuntrag to wipe his leftovers away!"

Shining Armor pulled away once his orgasm came to a stop. "What the heck, Twiley?! This isn't like you at all!" Was she a changeling in disguise? No, that seemed rather unlikely, now that they'd placed wards about the palace to detect such a possible invasion. "I don't know what you're up to, but I need some time alone." He undid the bonds that held Trixie in place. Unfortunately no matter how hard he tried the neutralizing ring refused to budge from the horn. In fact she yelped as it enclosed even further around her in response. "Damn it, this isn't funny!"

Twilight shrugged and with a flash the ring was teleported to who-knows-where. "Well, I picked up all the information I needed!" He coldly retreated from the room, uncertain how he could ever apologize to Trixie after what he'd done today, and wondered how he'd be able to live with himself. He'd simply skulk away to sleep the trauma off and face tomorrow with a hopefully clearer head.

Small sobs escaped Trixie who simply lied there. "Are you happy now? Trixie knows one thing; your brother's right. I may not like you much, or heck, not at all, but you seem totally out-of-character today! What happened to you? Are you on drugs or something?!"

"Better. I'm not even the Twilight you know. You know that parallel world Sunset Shimmer talks about? Well I'm her counterpart from there!" A heavy book materialized in one of her hooves. on closer inspection Trixie's stomach turned; it was bound in sewn-together flesh and covered in screaming faces. "I used to be a weakling like the Twilight you know, until I discovered this!"

Trixie's bladder emptied on the spot. She was too tired and scared to feel ashamed now even as a warm spot formed under her. "That's the Necronomicon?! I-it's supposed to be a myth!"

The necromancer quietly chuckled. "Oh, I assure you it's no mere fable. I realized the limits of science and decided to delve deeper to try and understand the occult. I was merely a dabbler at first, mostly too satisfy my curiosity, but then I stumbled on forbidden truths and couldn't hold back anymore!" She pressed the tome possessively to her bosom.

Normally Trixie would have been furious. But she realized that the moment Twilight had read too deep into the Necronomicon she had effectively ceased to exist; her personality had been murdered and replaced by this vile creature. To her surprise she mourned for her.

She clumsily staggered to all fours, her sweaty mane a wild mess, determined to stop Twilight Sparkle here. Maybe she was no match for her, but she knew this monster had influenced Shining Armor to do that, and likewise had annihilated the soul of the mare who stood before her. At the moment she didn't care if the cost was her life. She'd avenge her and save Equestria.

However she failed to notice the silent ripple in the air as reality warped and tore. A portal formed directly behind her. Innumerable tentacles shout out and seized her so fast her shrill scream was cut off and left to echo about the chambers. Soon only her hat, cape, and stains from the earlier union were evidence that she'd ever been here. The necromancer cackled to herself.

She was the darkness the Princesses had foreseen. The very army now bred to stop her would lead to Equestria's downfall. But for the moment she needed to bide her time. To plan. To experiment. To let their forces be build up so she could ultimately turn them.

With a whistle she trotted into the portal which closed behind her. All was silence.