Twilight Sparkle x Big Mac

Morning had arrived in Ponyville. With it came an avalanche of complications for the realm’s newest princess, turning the interior of her massive library treehouse into a chaotic mess of research.
Twilight was desperate to find a solution that would grant earth ponies a surge of raw physical strength. The coming seasons promised severe storms, the kind that would tear up the soil, bury the lands under thick, unforgiving snow, and ruin the crops. Her mind was entirely consumed by the need for a magical answer, a spell capable of reinforcing and hardening equine muscle.
If she could find this solution, she would solve a looming crisis. It would even alleviate the physical strain on the elderly ponies who still insisted on working the fields.
Princess Celestia herself had personally assigned her this mission. Yet, a full week had already slipped through Twilight’s hooves, leaving her trapped in a stagnant loop.
Despite her immense knowledge, which should have made the task simple, she was thoroughly utterly exhausted and overwhelmed by the weight of her duties.
She needed results, and she needed them immediately.
It happened that very morning, amidst a sea of books scattered recklessly across the floorboards. Finally, her eyes caught the precise theory she required.
Eager to put it to the test, she channeled the formula into a viable incantation, carefully drafting diagrams and contingency blueprints to ensure she could reverse the effects if anything went wrong.
Now that a preliminary solution was within her grasp, her hooves trembled with a nervous, electric energy. She was dying to unleash the magic she held raw within her grasp.
However, Spike, who usually served as her reliable little guinea pig, was over at Rarity’s boutique that morning. He had made her promise not to disturb him today. As for the rest of her friends, she doubted they would be of any use for this specific trial. She needed a male pony. A subject with a naturally denser, heavier build.
But… who?
***
There was only one stallion in town she could realistically turn to. Though they rarely spoke, she didn’t anticipate any issues.
“So… that is the situation.”
Twilight stood at the threshold of her home. She had called upon Applejack to convince her older brother to come over and do her a massive favor by testing the spell.
Big Macintosh stood directly in front of her. He had just finished delivering crates of sweet apples to various shops around the village.
Big Mac remained quiet, his heavy brow furrowing in deep thought. He was visibly hesitant. Truthfully, he hadn’t trusted a single word that had just spilled out of Twilight’s mouth, mainly because she hadn’t said anything he could actually comprehend.
She was so visibly wound up, her eyes wide and frantic, that it seemed as though she might completely lose her mind if this problem wasn’t resolved immediately. And she already carried a notorious reputation around the village for doing exactly that.
“So?” Twilight pressed, her voice tight.
“…Nope.”
“Come on, please. I really, truly need this. This could actually be a massive favor for you, too. It could make you stronger. Don’t you want to be a bit stronger?”
“Nope.”
“But if this works… it could help every single working pony out in the fields. Please, just help me.”
Big Mac grimaced with blatant suspicion, parting his heavy jaws slightly while narrowing his eyes. But as he looked down at Twilight’s desperate, wide-eyed puppy face, the massive red stallion finally let out a long, defeated sigh and nodded.
He didn’t have much of a choice. If he refused, she would likely do something reckless that they would all regret later, or at least, that was exactly what Applejack had warned him before he left the orchard.
“I swear you won’t regret this. Really, thank you so much.”
Twilight quickly ushered him into the warmth of the treehouse. Stepping over a scattered minefield of loose parchment and open books, Big Mac glanced down out of the corner of his eye. The text on the pages was written in a complex, archaic language he could barely decipher. What caught his attention instead were the illustrations, highly detailed anatomical drawings and precise structural graphics. Looking up, he noticed the mess wasn’t confined to the floor; a crude, makeshift model sat on a nearby table, braced by heavy volumes to keep it from collapsing under its own weight.
“Over here, over here,” Twilight called out, her horn glowing faintly as she guided him toward the center of the room.
Big Mac followed her, his chest rising and falling with a sigh that, this time, carried a distinct edge of nervousness. He glanced back out the door to ensure his apple cart was safe outside. Finding no further excuses to stall, he stepped forward, closing the distance until he stood just inches away from the smaller purple alicorn.
“Alright, then. This will be easy,” Twilight murmured. Though she was looking at Big Mac, it sounded far more like she was trying to convince herself. “All you have to do is stand perfectly still right there, and make sure you resist the spell.”
“…Resist?”
Twilight didn’t turn her head fully, but she gave a sharp, tense nod.
Big Mac shifted his heavy hooves, a sudden instinct telling him that he still had time to turn around and walk right back out the door.
But to his misfortune, Twilight had already locked onto him. Using her hooves to unfurl a dense scroll, the alicorn began to chant. A vibrant green light sparked at the tip of her horn, rapidly bleeding into a blinding white, before settling into a deep, volatile purple. A constricting ring of shifting colors materialized around Big Mac’s massive frame. In an instant, Twilight unleashed a heavy, concentrated beam of raw magic straight into his chest.
Knocked back half a step by the sheer impact, Big Mac gritted his teeth and tried to resist the pressure with everything he had. It felt as though an invisible, heavy hand was pressing hard against his forehead, while his muscles violently locked up and stiffened in response. His throat went completely dry, a sudden wave of nausea washing over him as his chest heaved. The floor suddenly seemed further away, his perspective warping as his heavy leg muscles hardened into dense, rigid iron.
His right flank locked tight, hardening as it swelled beneath his hide. He could feel himself growing thicker, denser, or at least, that was the staggering sensation overwhelming his senses. Closing his eyes to endure the mounting pressure, the crushing ache suddenly vanished.
An explosive pulse detonated from deep within his core, ripping outward in a violent shockwave. The blast sent stacks of heavy books flying across the room and completely shattered the wooden model behind him, reducing it to splinters. Big Mac coughed roughly, the sudden cloud of kicked-up dust invading his nostrils. He scratched at his muzzle and let out a heavy sneeze.
The force of the sneeze instantly cleared the air around him, blasting the remaining dust toward the rafters and out through the high upper windows.
Big Mac stared down at his front hoof in utter confusion, then looked around the wrecked room. His entire body felt wired, tightly strung. His left shoulder throbbed with a dull ache, as if the muscle hadn’t settled into place correctly, but after a deep, deliberate stretch of his legs, a wave of raw satisfaction washed over him.
He flicked his tail from side to side and shook his muzzle, trying to spot Twilight through the chaotic mess. She seemed to have vanished into the wreckage. She had to be in here somewhere.
Suddenly, she pushed herself up from beneath a pile of parchment, coughing and spitting out dust. Big Mac stepped toward her, his heavy features softening with concern, but her eyes snapped open before he could even reach her side.
She froze, completely dumbfounded. Her eyes were wide as saucers, her jaw slack, utterly paralyzed by whatever thoughts were racing through her mind.
“Twilight…?” Big Mac muttered, completely oblivious to the bizarre, intense look overtaking the alicorn’s face.
Twilight didn’t answer. She simply shook her head from side to side, her gaze burning with an intense, animalistic curiosity as she began to slowly circle the massive red stallion.
“It seems… my spell actually worked.”
“Everything alright?”
Though his question was simple, Twilight’s demeanor had shifted entirely.
Her tail twitched out of the way, exposing her hindquarters, and her lips parted slightly as she began to salivate, her breath turning shallow and hot.
Big Mac didn’t understand what was happening, but seeing her dazed, heavy stare made him realize he wasn’t the only one overwhelmed by the results.
With a quick flare of her horn, she levitated a large mirror over, forcing Big Mac to look at his reflection.
He gasped, staring at his new, altered physique. His frame was significantly more robust, his chest broader, and his legs thick with dense, powerful muscle. He looked like a stallion who had pushed his body to its absolute physical limits, for a second, he was reminded of Bulk Biceps, the massive white stallion he occasionally saw flexing around town. He glanced back at his flank and his thick, corded neck; there was no denying he looked incredibly good.
From the raw power humming beneath his coat, his physical strength had clearly skyrocketed too. That was a perfect sign. The magic had actually done its job.
Big Mac turned to look for Twilight, but she had already slipped directly behind him. He blinked in confusion, noticing the purple alicorn was staring intently at something very specific between his thighs.
It wasn’t until that exact moment that a deep, heavy twitching caught his attention down below.
He had been too distracted by the chaotic explosion to notice, but his cock had gone completely, brutally hard.
When he looked down to inspect himself, he saw it was massive, far larger and thicker than its usual size. The shaft was violently engorged, thick veins wrapping tightly around the swollen skin, and a few thick drops of pre-cum were already leaking from the tip.
He immediately scrambled away from her, his eyes darting around the room in a mix of confusion and sheer panic.
“A-Aah… nop, sorry… I mean…”
Big Mac choked on his words, failing to find the right explanation. He desperately didn’t want her to think he had done this on purpose, nor did he want to get into trouble with one of his sister’s closest friends, especially since she was a princess.
Twilight, however, didn’t look offended at all. If anything, she stepped even closer, stalking him. Big Mac kept backing away, keeping his eyes locked onto her as he retreated blindly. His heavy hooves caught on the scattered books from the collapsed model, making him lose his footing. He crashed hard onto his back, his hind legs splaying wide and exposing his massive, throbbing cock completely to the open air.
Twilight stepped right up to him, hovering just inches away from his swollen purple glans, clearly intending to inspect every single inch of it up close.
“Y-You… alright?” Big Mac rasped, his heart hammering against his ribs as Twilight finally looked up and blinked.
“Y-Yes… it’s just that… it’s releasing a highly specific scent. I don’t know if you notice it… it’s entirely new. It wasn’t predicted in my spell that something like this would happen, and I think this might be something I need to observe very closely.”
“A-Aaah…”
Big Mac was about to place a hoof on her head, but he feared he might trigger some spell from her horn. He had always been curious to touch a horn with confidence, but he figured if he did it right now, he was risking anything, especially after witnessing the tremendous spell the princess was capable of casting.
Twilight, however, took another step forward, her chin reaching Big Mac’s balls.
Her nose lightly brushed his glans… and she opened her mouth, flicking her tongue out to taste the drops of pre-cum that had already leaked out. Big Mac flushed instantly, feeling Twilight’s tongue begin to clean away his creamy pre-cum, his chest heaving up and down constantly while he felt his hind legs tremble. He swallowed hard, his mind racing, and shook his head from side to side before placing both hooves on the Twilight’s head.
“W-Wait…”
But before he could say anything else, it seemed curiosity completely took over Twilight. There was something wild in her eyes, as if the taste of his pre-cum had utterly bewitched her, or at least, the raw pheromones Big Mac was now putting off without realizing it had completely drugged the closest pony around.
With his cock throbbing hard, Twilight pushed her head even closer despite Big Mac’s attempts to push her away, forcing herself forward until she could reach his glans and, finally, swallow it down.
She took it into her mouth, her eyes burning with the raw heat of a pony who needed this more than anything, slowly taking inch after inch deeper into her mouth. Her teeth grazed the big stallion’s shaft, making him let out a hot huff. He swallowed, panting harder as his cock pulsed violently inside Twilight’s mouth.
She kept swallowing inch by inch, slavering spit down the sides of his shaft while her tongue buckled under the pony’s sheer size, her throat opening wide as she tried to engulf his entire thickness. It looked like Twilight had gone completely feral, entirely consumed by it now.
She whipped her tail through the air, and Big Mac’s eyes went wide as saucers in confusion, but it wasn’t until she shifted her hindquarters to the side that he saw her rear, her tight pussy, and with it, her swelling vulva. Big Mac blushed even deeper and tried to push the pony away; he worried she was acting completely unconsciously and didn’t want to cause trouble, let alone have her complain later or get him into severe legal issues. He didn’t want to be a stallion who was just used either… but… he couldn’t deny that this felt like the best thing in the world. Twilight was sucking him off, after all.
Using her mouth like a tight, gripping sex toy, Big Mac couldn’t help himself anymore and gripped her head with his hooves, shifting her slowly as he began to deliver hot, heavy thrusts. Her tongue pressed firmly against his shaft, making him pulse harder with every stroke. She gagged slightly once his cock hit the back of her throat, but she didn’t put up any resistance; instead, she began to salivate even more, driven to satisfy the well-hung stallion.
As if it were a game, she pressed her hooves against Big Mac’s balls, starting to fondle them while bobbing her head up and down. She would let almost his entire length slip out for a moment before plunging back down; it seemed that with just half his cock inside her, it already reached her throat, forcing her to pace herself.
Big Mac snorted heavily and finally placed his hoof carefully on her horn… and shoved her straight down. She whined, letting out a muffled squeal as her eyes welled with tears, but her mouth ended up swallowing several more inches of his cock.
Slowly, she sank lower despite the resistance until the purple pony’s lips finally smashed against his crotch, burying his pair of massive balls right against her chin. She felt Big Mac start using her mouth completely as he pleased, fucking her mouth raw with powerful, heavy thrusts. His cock splattered juices deep inside her throat, and she could only take it and endure, yet she felt the sensation piercing straight through her body, making her squeal and moan with pure pleasure.
“F-Fuck…”
“Mm-mhmmm…!”
Twilight’s muffled, incoherent noises only served to turn on the stallion even more as he thrust with all the strength in the world. His lungs pumped out waves of hot breath, blasting right over the face of the used pony. She tried to shift slightly to the side to handle the massive cock better, but she couldn’t. Big Mac’s raw strength was completely overwhelming now. Even Big Mac had realized it, but he did his best to hold the pony firmly in place, the sheer horniness completely taking him over too.
He felt Twilight’s tongue finally wrap tight around his glans, trying to squeeze every drop of semen out of him, as if she were milking him dry. Big Mac let out a powerful, strained grunt, and finally, he began to thrust with brutal force until he felt her throat expand to lock his cock down tight. Letting out a massive gasp of air, he violently fired several thick ropes deep inside her.
Big Mac used his right hoof to pull Twilight a bit closer, but she was already pushed up to her absolute limit, her muzzle crushed tightly against his groin. Heavy moans and ragged pants tore through the quiet room until, finally, Big Mac’s thick stallion cock slipped out from between Twilight’s lips. She whimpered softly, desperately trying to catch her breath while long, sticky strings of thick semen trailed from her mouth, dripping back down onto the raw shaft she had just been sucking. Yet, it wasn’t enough to satisfy her; she leaned down and pressed a wet kiss to his glans, silently licking the swollen tip and sucking on it while letting out small, tender squeaks. Her eyes remained squeezed shut, as if she were a pony completely, helplessly in love, desperate to never forget this exact moment.
Big Mac groaned deeply, throwing his head back as he tried to stop his mind from racing over what was happening, but his body left him no choice. His cock was still pulsing violently between her hooves, hard enough that he could easily blow another massive load into her.
And that was exactly what happened.
Fortunately, Twilight didn’t seem to mind the sudden surge at all, eagerly drinking down every heavy squirt. Her tongue worked with frantic, intense strokes to swallow every single drop and trailing bit of moisture before it could ruin the floorboards. Her front hooves finally hit the ground with a soft thud, her small hooves scratching and clawing at the wood with sudden force. She was looking for something more, a deeper, more primal kind of satisfaction.
Big Mac gently but firmly nudged her muzzle away from his wet shaft, letting out a heavy, exhausted sigh. He pressed a hoof to his forehead, looking down at Twilight’s wide, desperate puppy-dog eyes, which still made his chest tighten with a wave of sheer nervousness.
“Are you… sure you want to keep going with this? I don’t want any trouble with my sister.”
“She doesn’t ever need to find out about this,” Twilight whispered, leaning down to rub her soft cheek directly against his pulsing length. The friction caused his shaft to twitch, smearing a stray dollop of thick semen right into her purple coat. With a quick flare of her horn, her magic enveloped the slick fluid, lifting it cleanly from her fur before she brought it straight to her own mouth to lick it off, flashing the massive red stallion a sharp, incredibly wicked smile. “This stays our little secret… besides, this data is highly specific.”
Big Mac blinked rapidly, watching Twilight push herself up onto all fours. She stared at him with intense curiosity, her wide, flushed smile proving she was far beyond pleased with how the experiment was turning out.
This was almost certainly not the outcome she had planned for the morning, but her previous state of high anxiety and frayed nerves had left her defenses completely down. The moment Big Mac’s magically enhanced pheromones hit her nostrils, her body’s natural hormones had completely mutated, turning her utterly feral.
Twilight smiled, taking a slow step back before spinning around completely, deliberately lifting her tail to expose her hindquarters to him. Her tight, purple vulva was visibly twitching, her slick outer lips opening and closing in an inviting, heavy rhythm that offered him a perfectly clear, incredibly mouth-watering view.
Big Mac ran his tongue over his dry lips, his mind still dazed as his heavy hooves guided him forward toward her waiting backside.
“Come closer, my little pony.”
Big Mac pressed his broad muzzle flush against her smooth rear, taking in a deep, heavy sniff of her heat. He flicked his tongue out to lick her anus once, purely out of a stallion’s raw curiosity, making her let out a sharp whimper before she used a tight grip of her telekinesis to force his head down lower. Big Mac pressed his lips directly against her swollen vulva and began to lick her open. He ran his tongue from top to bottom, drinking down the hot, sweet fluids that were already pooling outside, making his task much easier. Twilight relaxed under his touch, spreading her hind legs wider to offer her soaked rear entirely to Big Mac’s face.
“S-Seems like you’ve… really had a talented tongue hidden away in there this whole time.”
“Yeep.”
Big Mac buried his tongue even deeper into Twilight’s slick warmth. He used his large right hoof to part her plush glutes, his rough hooves gently tracing and rubbing against her swollen clitoris to masturbate her. He stroked her up and down in a steady, heavy rhythm before leaning in to trap the engorged nub right between his lips, sucking on it hard.
Twilight let out a loud, breathless whinny of pure ecstasy, violently pressing her hindquarters harder against Big Mac’s face to deepen the contact.
“A-Aaah,” Big Mac gasped, completely losing his breath for a moment under the sudden, heavy pressure of her rear. Twilight let out a soft, teasing giggle, shifting slightly to release him.
“B-Be careful, I’m incredibly sensitive down there… Spike usually helps me out with these kinds of experiments, and I always make sure to reward him too. But I think… it’s good to try out a new tongue every now and then.”
Big Mac’s cheeks flushed an incredibly deep crimson as his mind reluctantly pictured his small dragon friend mounting the purple alicorn. He shook his head violently from side to side to banish the thought, but the mental image only made his cock pulse with a sudden, vicious throb.
Using her own magic, Twilight gripped her glutes and pulled them even wider apart, giving Big Mac total permission to dive back in and lick her clean.
This time, he buried his face with far more intensity, forcing his thick tongue as deep inside her as it could possibly go, ensuring he coated every internal inch. He lapped at her with deliberate, heavy strokes, taking his time to savor her fully.
His tongue swirled deep within her tight channel, picking up her fresh, slick cream mixed with the unmistakable, slightly musky taste of older fluids. He deliberately chose not to think about who those fluids belonged to, focusing instead on the incredibly rich, potent flavor filling his mouth. He sucked and lapped harder, reducing her to a mess of breathless whimpers.
She clamped down hard, her internal muscles squeezing Big Mac’s tongue the moment he pushed a bit deeper, forcing the stallion to swallow a heavy mouthful of her hot, slick juices.
He kept driving his tongue inward despite how tightly the mare’s walls gripped him, his heavy hips shifting in an instinctive, rhythmic motion. He wanted to fuck her. He needed to.
Big Mac let out a loud, ragged snort, the blistering heat of an aroused stallion blasting directly against Twilight’s puckered anus, causing the tight ring to twitch and flex, desperately craving attention of its own.
With a heavy hoof, Big Mac began to stroke her smooth glute, tracing his way down toward her tight, puckered hole. He pulled his wet lips away from her dripping vulva for a split second, redirecting his focus entirely toward her twitching anus.
In private, with his past mares, he had always enjoyed giving them anal oral. It was a deeply personal taste of his, one he hoped wouldn’t make the princess uncomfortable.
But seeing her reaction and her beautiful little face, he knew she would let him do whatever he proposed.
He spat a bit against her puckered hole and began to lick around the edges. He swirled his tongue in circles around the purple pony’s tight ring, lapping harder until he finally drove his tongue inside, sinking it deeper and deeper into her interior. Her breathing hitched, her chest trembled, and he heard Twilight let out a sharp whinny. She whimpered and panted, her tongue rolling out of her mouth as her hooves clawed at the floor, squeezing her right eye shut.
It was a look of pure, unadulterated pleasure.
Big Mac began to lick even deeper; it was tight, incredibly tight. But the flavor was intense. It tasted distinctly salty, and it was hot, truly scalding hot. Feeling the heat rise in his throat, he swallowed hard before lapping further in, parting her plush glutes a little wider.
“A-aah…”
He pushed his tongue in as far as it could go, wanting to thoroughly inspect her deepest depths.
He licked in circles, from top to bottom, before finally pulling his muzzle away. He slid his tongue back in once more, then drew it out, continuing until he was finally satisfied. He delivered a couple of sharp slaps to her rear, making her shudder with pleasure, noticing that her vulva was twitching in perfect sync with the blows.
Big Mac’s cock was swollen to the absolute limit. He wanted to fuck, he wanted to penetrate, he wanted to split the pony wide open with every ounce of his strength.
On one hand, he told himself he needed to calm down; if he didn’t keep his head, he might truly regret it. It seemed his testosterone had completely spiked.
From what he could gather internally, while trying to stay somewhat composed to keep his touch careful for the mare, the spell had likely enhanced or triggered parts of his anatomy that usually remained dormant, pumping him full of adrenaline, or at least making him feel that exact rush.
That was the reason his cock throbbed with a dull, tight ache every time it pulsed. But at the same time, that pressure seemed to double its thickness with every heartbeat.
By this point, his shaft had absorbed all the heat radiating from the mare, and it was finally on display in its maximum, monstrous glory.
Twilight noticed it, opening her hind legs even wider and whipping her tail through the air, desperately calling the red stallion for his attention.
Big Mac nipped at her tail, and she let out a sharp cry into the open air.
“J-Just fuck me, already… I need it, dammit… please!”
Big Mac didn’t think he could hold back for another second, so he simply loomed over her.
He mounted her carefully, his heavy frame settling into place until his raw cock finally brushed against her wet vulva. For a brief moment, the tip grazed against her tight anus, but using her magic once again, she guided his shaft directly toward her pussy, and she finally felt Big Mac’s massive glans beginning to slide inside her.
She smiled, a completely dazed, blissful expression on her face, and began to push her rear back to meet him. However, she hadn’t yet realized the true challenge of taking such a long, thick beast into her petite vulva.
Carefully, Big Mac pressed his heavy shaft against her tight channel, parting her glutes. He spat directly onto her vulva, rubbing the thick saliva against her clitoris, making her whimper with a deep blush. He wanted to make sure she thoroughly enjoyed it too.
Big Mac let out a heavy snort, feeling his massive cock slide smoothly deep inside Twilight’s soaking vulva. She looked back at him, flashing a tender, incredibly seductive smile. He made sure to lock that image into his mind; it was highly likely he would never get an opportunity like this again in his life. Huffing hot breath through his nostrils, he paused for a brief moment, his mind racing.
He hovered directly over Twilight, leaning his full weight down against her. He pressed his broad chest flush against her back, pulling her frame tightly into his body as he sank his cock even deeper into her channel, making her let out a sharp gasp.
“B-Big Mac…”
“Listen… by any chance… are you absolutely sure you want to keep going?”
“What…? What do you mean?”
Big Mac swallowed hard. Up close, her flushed face was undeniably beautiful.
“Look… I don’t want you… to end up hating me later, or… you know… you’re a princess…”
“I don’t understand you… just shut up and fuck me.”
Big Mac worried that Twilight might be under some sort of spellbound trance, but everything indicated she was fully aware. Even so, he tried to convince himself that her raw commands were the absolute truth.
Gripping her plush rear with his hooves, he began to drive into her, forcing her hind legs a bit wider apart. Big Mac delivered a series of powerful, heavy thrusts, hitting a highly sensitive, deeply buried sweet spot inside her over and over again. Her slick juices splattered out from the sides of her pussy, accidentally staining a few open pages of the books scattered on the floorboards, but neither of them cared about the mess now.
Gently gripping her chin, Big Mac pulled her face up to his and kissed her. It started as a soft, quiet embrace, but instantly ignited into a blistering, scorching heat.
Twilight was truly at her absolute peak of arousal. Big Mac began to pump into her with far more intensity, feeling his entire shaft pulse violently inside her. His swollen veins worked overtime, creating friction and stimulating the tight inner walls of her vulva, causing her to writhe in pure ecstasy against his cock. She began slamming her hips backward to meet him, her frantic movements forcing his massive length even deeper, stretching her internal channel to the absolute limit. A small, distinct bulge soon rippled beneath her flat stomach, forcing a loud, ragged moan from her throat.
Big Mac cut off her cry before she could make enough noise to cause a scene, leaning down to kiss her with total devotion. He used his hooves to deliver sharp, heavy slaps to her bare glutes, one after the other, until she was completely submissive beneath his weight. Twilight swayed a bit under the impact, but her hind legs held firmer than ever; after all, she truly wanted to lose herself completely in the sensation.
Big Mac nipped her lower lip, sucking on it hungrily. She tasted salty yet sweet all at once, sharing the exact flavor of the horniest mare he had ever seen. If he had known Twilight could get this incredibly wild for him, he would have tried something long before today. Though, knowing himself, his natural shyness would have won.
He exhaled heavily against her muzzle, suddenly feeling her inner walls clamp down on him with a tight, desperate squeeze. Big Mac didn’t stop to think; he delivered a pair of hard, ringing slaps to her rear, making her glutes quiver.
“H-H-Heey…” Twilight’s whimper cut off in vain as Big Mac began to hammer his cock deeper. “I-It hurts… wait…”
But Big Mac wasn’t listening anymore. Driving his hips forward with brutal force, he finally buried his entire length inside her. Twilight whimpered with her eyes squeezed shut, desperately trying to regain her composure, but she could only feel his thick shaft filling her completely, making the distinct shape in her belly look incredibly pronounced.
Big Mac let out a loud, triumphant stallion whinny the moment he found the freedom to move exactly as he wanted. Over and over, he slammed into her with savage force, gripping Twilight’s tail to pull her hindquarters flush against his groin, watching her purple cheeks bounce wildly with every single impact.
Smiling as he let himself go completely, Big Mac began to fuck her like an absolute monster. His cock tore through her interior with raw, unbridled fury, pushing the poor princess’s overstimulated vulva to its absolute threshold, making her scream louder than she ever had during her sessions with Spike.
“H-Harder, j-just like that, give it to me harder… f-fuck…! By Celestia…! You have such a huge, massive cock, don’t stop, don’t stop, I’m about to come, fuuuckk…!”
Big Mac leaned down to her neck, licking the sensitive skin firmly before gripping her mane in his teeth and pulling her back toward him. Her tail lashed wildly through the air as he forced her into a new position, shifting her onto a pile of discarded books. She ended up flat on her back over the pages, and Big Mac pulled his wet cock entirely out of her before plunging it all the way back in with a single, sudden stroke, slamming her body down against the soaked parchment.
With his heavy thrusts maintaining a brutal rhythm, she began to scream even harder, shuddering like a total slut begging for more cock than ever before. Laid out and used completely like a dirty sex toy, the purple pony could feel her climax rushing forward; her inner walls were ready to receive every drop of Big Mac’s hot stallion seed. She didn’t care about being filled to the brim by such a massive breeder. She wanted this more than anything, more than anyone. She didn’t want any other mare to have a sexual romp with him; the pleasure was driving her completely insane.
“B-Big Mac… cum… inside!”
Big Mac didn’t hesitate, driving his entire massive cock deep with one final, heavy thrust, pushing all the way into the absolute depths of Twilight’s tight channel. Without warning, he began to blow his load, releasing a torrent of thick, creamy seed in heavy, visceral bursts. The intense musk hit him instantly, sending a wave of lightheadedness to his brain as he clamped his jaws down harder onto the princess’s lavender mane. Delivering a few more desperate, grinding thrusts, he let his semen overflow from her slick rear, splattering across her thighs and the messy floorboards. He jolted with a few final, powerful twitches before collapsing heavily against her back, his shaft still pulsing violently inside her, firing off several more thick, trailing squirts with every internal contraction of her walls.
It seemed that as long as the spell remained active, his cock wouldn’t soften, leaving him with the raw ability to fill her up as many times as he desired. Flushed crimson, he looked down at the princess, who was shivering uncontrollably beneath his weight.
Cradling his cheek with a gentle hoof, Twilight looked up at him out of the corner of her eye and pressed a soft kiss to his muzzle, resting her forehead against his. Big Mac blushed instantly, freezing in place. The kiss was incredibly tender now, a stark contrast to the aggressive, animalistic passion from moments before. Just… tender.
She nuzzled a soft kiss into his neck before finally letting her head rest against the floorboards, her shallow breaths gradually evening out.
She had just showered him with genuine affection.
Big Mac remained pinned on top of her in total silence, his face burning an even deeper red than before. She possessed everything it took to make a stallion fall helplessly for her, but he didn’t know if it was right to let himself be carried away by something as cheap as a magically induced encounter.
His heart hammered violently against his ribs, but he did his best to stay composed. His engorged shaft gave an involuntary, deep twitch, pumping another hot string of semen into her depths, forcing a sharp whimper from her throat as she locked her hind legs tighter around his hips. Twilight swallowed hard, deliberately shunting her rear backward against his pelvis. The friction triggered a sudden, secondary release, and Big Mac fired a few more bursts that completely flooded her interior before he slowly, deliberately dragged his length out of her. Twilight shuddered with every single inch that left her body, her walls twitching as if she were being unplugged from one of those massive dildos she had secretly envied in the window displays of Ponyville’s back-alley adult shops.
The moment his massive glans slipped entirely free, Twilight rolled over onto her side, resting on the floor for just a second before dragging her face right back to his wet cock. Big Mac slumped onto his back, completely exhausted and panting. But Twilight crawled right over to him on all fours. She rubbed her soft, flushed cheek against his sticky shaft and let out a breathless giggle, causing Big Mac to smile despite his exhaustion.
Twilight wrapped her tongue around his glans for a brief moment, lapping up the final, stray leaks of semen into her mouth, before dragging her body up to curl against the massive red stallion’s broad chest, which was still heavily bulked and defined from the raw power of the spell.
“Seriously… nobody has ever fucked me like that.”
Big Mac just let out a heavy snort, flashing her a warm smile. She pressed her soft lips flush against his, giving him a gentle kiss. Flushed crimson, Big Mac eagerly reciprocated, pressing his heavy jaws against hers as they shared the sweet embrace.
Feeling his heart hammer in his chest, he pulled Twilight tightly into his body, cradling her close against his broad, muscular chest. She exhaled softly, letting out a breathless little giggle before laying back down with an affectionate, dazed smile.
Big Mac caressed her smooth cheek for a moment… then slid his other heavy hoof down along her spine. He gently stroked her back before sliding lower onto her rear, giving one of her plush, purple glutes a firm, proprietary squeeze.
“You still want more?”
“…It’s inevitable…”
Twilight smiled wickedly, rubbing her muzzle directly against the thick skin of his neck.
“Are you truly comfortable with all of this? I feel like I’m being incredibly impulsive right now.”
“Not at all… honestly, I’m really enjoying this. More than anything.”
“If Applejack ever finds out about this, she’s going to be absolutely furious…”
“…Eep, most likely. But if you keep the secret, so will I,” Big Mac murmured, his deep voice vibrating against her skin.
Twilight let out a soft giggle, leaning in to steal one more tender kiss from the massive red stallion.
Then, she began to slide her head down his torso. Moving lower inch by inch, she reached his heavy cock once more, rubbing her soft muzzle flush against the hot shaft. She parted her lips, taking his length right back into her mouth. Twilight’s thick, talented tongue began to lap along every single centimeter of Big Mac’s girth. The stallion let out a rough snort with a wild grin, instantly shooting a thick jet of pre-cum straight across her beautiful face.
Twilight caught whatever fluid she could with her lips, and as Big Mac fired another slick squirt, she whipped her head and expertly caught the fresh trail right out of the air.
Big Mac let out a low chuckle, and she dropped her head back down onto his glans, aggressively licking the swollen tip before opening her wet lips wide to slide it all the way in. Carefully, she began to suck on the heavy head again. He could feel his cock pulsing violently, rapidly adapting to the friction as she swirled her tongue in tight circles, desperate to savor more of his rich, creamy seed.
She seemed completely natural and dedicated to her oral performance. Big Mac had already been thoroughly satisfied by the actual fucking, so he had never imagined that after-sex oral could feel this incredibly intense and rewarding.
He had total physical control over her, yet the sheer risk of getting caught still made his coat stand on end. But every single time Twilight buried her face in his groin, sucking him dry and swallowing inch after inch of his shaft, the sensation left him entirely paralyzed. As she cleaned his cock with her tongue, licking up her own musky pussy fluids mixed with the dried semen from their earlier round, he completely forgot about the rest of the world.
Delivering heavy, burning movements from his hips, he began to push back against her mouth with a sudden wave of raw horniness. Thrusting directly into her throat, his movements turned rough and demanding, though he took careful care not to accidentally nick her with his hooves. He could feel her throat muscles clamping tight, desperately needing air, but he had no intention of distracting the purple alicorn from her absolute favorite activity. Using her horn as a solid handhold, he firmly gripped her head, guiding her face further down to force her to swallow his entire length.
Maintaining a rapid, unyielding rhythm, he began to face-fuck her over and over, determined to drive his shaft all the way down into the deepest depths of her throat this time. He wanted to feel himself stretching her inside out; he wanted to watch her slender throat visibly expand as it fought to accommodate his massive glans. He was utterly feral, hotter than he had ever been in his life.
He began to thrust like a madman, hammering into her mouth and forcing Twilight’s lips to stretch to their absolute limits. She whimpered with her eyes squeezed tight, letting out muffled, gagging squeaks as tears welled up and spilled down her cheeks, but it was nothing her aroused body couldn’t handle. She kept her tearing eyes locked onto Big Mac with pure, unadulterated love.
Realizing he could use her mouth completely as he pleased, he made sure to press even deeper this time, plunging until he felt her violently gagging around his girth. Thick strings of slick saliva began to overflow and drool down the corners of her mouth, a sight that looked incredibly hot and sexy to the dominant stallion. He let out a primal grunt, twitching violently inside her mouth until he finally blew his load completely, letting the last heavy ropes of semen pump directly into her throat.
Twilight whipped her tail through the air with absolute ecstasy, eagerly swallowing down every single drop of his hot seed before finally letting his slick, wet cock slide out of her mouth. Big Mac let out one final, exhausted gasp, a satisfied grin spreading across his muzzle as he lay completely ruined.
However, despite the exhaustion pulling at her hind legs, it seemed Twilight wasn’t done with him just yet. She wanted to see if all that intense analytical stimulation in her brain was truly worth the effort.
Taking him completely by surprise, she carefully crawled right up his body to mount him. Positioning her hindquarters directly over his face, she looked down at him with a look of pure, submissive tenderness, carefully aligning Big Mac’s re-engorging shaft right against her tight anus, which was twitching and flexing with nervous anticipation.
“I’m… a virgin there.”
“Are you absolutely sure? Look, we can just leave it…”
“Listen… this is incredibly difficult for me, but if we’re already doing this, I want to take it to the absolute limit. Besides… I want you to truly fill me up a little more in there, alright?”
Big Mac swallowed hard, his cheeks burning a deep crimson as he gave her a firm nod.
He would do absolutely anything the princess commanded.
Feeling his glans brush against her anus as it began to wedge inside, he let out a low breath, blushing as he noticed her looking back at him with a wave of timidity. To him, she looked incredibly precious in her vulnerability.
Placing his hooves firmly on her sides, he carefully aligned his thick shaft with her tight channel, and she used her own magic to help guide the tip. With a slow, deliberate pressure, his heavy cock began to slide past her tight ring. She whimpered with her mouth open, squeezing her eyes shut as she pressed one hoof flat against Big Mac’s broad chest. Big Mac huffed, gripping Twilight’s plush glutes to spread them slightly, letting her dictate the pace of the entry.
They moved bit by bit, his massive length burying itself centimeter by centimeter into her interior. Her rear was staggeringly tight, far more than Big Mac could have ever imagined; he well remembered how constricting her ring had felt against his tongue earlier, but despite all that wet stimulation, taking an enormous horse cock up her ass was a completely different story.
Twilight pulled back for a split second… it seemed she wanted to give up the moment a sharp, burning ache hit her, an outcry she tried desperately to silence. But Big Mac locked his heavy hooves around her rear, halting her retreat and keeping her pinned in place.
Twilight didn’t say a word, completely leaving the decision up to the strength of his hooves.
Carefully, Big Mac began to push a little more of his width inside before pulling back, initiating a shallow, grinding rhythm using only his swollen glans and the first few centimeters of his shaft.
He kept up these short, teasing thrusts while her tight pucker helplessly flexed and clamped down around his invading length.
Finally, after a few moments of adapting to the friction, she gave a weak nod.
“Y-You can push it a little deeper now… please.”
That was all Big Mac needed to hear.
He gripped his own shaft and began to drive it in with care, centimeter by centimeter once again, but this time adding a bit more force to ensure he didn’t get stuck. He reached down and swiped some of the excess juices overflowing from the mare’s drenched vulva, rubbing the slick fluid over her straining anus as a makeshift lubricant. She let out a sharp, frightened squeak at the sudden touch, but Big Mac instantly quieted her with a hot, demanding kiss, forcing her head down against his chest in a show of absolute dominance. Twilight collapsed against him, letting her body heat melt into his, desperately soaking up the warmth and protection she so sorely needed.
The remaining inches slowly disappeared inside her… until finally, Big Mac’s entire monster shaft was buried to the hilt.
Big Mac held completely still for a few agonizing seconds to let her take the size, before he finally began to rock his pelvis forward and back, initiating a searing, heavy rhythm for the red stallion.
“I-It hurts a little…”
“You’re doing great… please… just hold on for me.”
Twilight nodded, her face burning crimson, though she could already feel the last of her energy draining away.
Big Mac noticed her flagging strength and gently pulled her down, shifting her flat onto the floorboards.
This time, he pinned himself directly over her, staring straight into her dazed face. He kissed her muzzle once more, then slowly dragged his slick cock almost entirely out of her tight ass, only to drive it right back in with a sudden, heavy slam that ripped a loud, ragged scream from her throat.
Giving slight tugs backward and sliding his cock out by inches, he began to whimper, trying to figure out how to make her experience even greater waves of pleasure. The extreme tightness of her rear stimulated him more than ever, but if possible, he wanted this raw sensation to be permanently burned into her mind.
He kissed her full on the lips again, and while his tongue tangled with hers, he slammed his heavy hooves against her glutes, lifting her hindquarters slightly as he began to drive into her with more force.
His movements turned increasingly primal as he leaned his massive frame flush against her body. He ground his hips in heavy circles over and over, delivering a few awkward, uncoordinated thrusts at first, but his rhythm quickly became lethal once he pinpointed a deeply sensitive sweet spot inside her.
Twilight whimpered with her eyes squeezed shut, pressing her muzzle desperately against Big Mac’s as she refused to break the wet kiss he was giving her. The scorching heat radiating from her own body was driving her completely insane.
Even though it burned to have her interior so thoroughly violated by his enormous stallion shaft, she wanted to be torn apart now more than ever. The rough friction, his heavy touch, and his demanding kisses stimulated her to the absolute maximum, making her hornier than she had ever been in her life.
She could feel her anus flexing and clamping tightly around him with increasing frequency, stretching to its absolute limit to accommodate the thickest inches near the base of the red pony’s cock. He was stretching her completely open; every time he pulled back, he left her ring entirely dilated, only to ram right back inside with brutal, unrelenting force, hitting her harder than before.
Twilight closed her eyes tight against the sudden violence of his hips, desperately trying to process the pleasure and maintain her sanity. But she was losing all concentration, her thoughts dissolving into nothingness. Every time she felt his massive cock hit the absolute bottom of her ass, the only thing left was a desperate urge to beg for more, though she bit it back, knowing that if she gave in, she would black out completely.
Deep down, she craved that total oblivion, but she felt terrified.
Would she really be able to endure the full weight of his size if Big Mac let himself go entirely? Doubts swirled and crashed through her mind like a storm, but then she felt a heavy hoof anchor firmly against her side, and Big Mac stared down into her eyes with raw, intense focus.
“I want… to make sure you’re comfortable.”
His deep voice made Twilight blush furiously. She forced her hind legs even wider apart and, looking up at him with entirely submissive, dazed eyes, she licked his muzzle.
“Please… do it. I need it.”
There was no turning back now.
With her purple glutes completely surrendered to the red stallion’s mercy, Big Mac began to hammer into her with terrifying power. Planting his hind hooves firmly on the floorboards, he delivered a massive, bucking thrust that sent a violent shudder through Twilight’s split rear. The sheer force behind his hips was entirely different now; having paced himself until this exact moment, he decided he would no longer hold back or play it safe. His cock was on the verge of exploding, but he wanted to ruthlessly break her in and keep her entirely under his control.
If this was a once-in-a-lifetime opportunity, he was going to exploit it to the absolute limit before she could change her mind, completely unaware that she craved this raw treatment just as badly.
Twilight drowned in his hot, heavy kisses, hungrily sucking on Big Mac’s tongue whenever it slid deep into her mouth, their saliva tangling and mixing heavily. Big Mac didn’t care that he was tasting the stray secretions of her vulva blended with the residual semen from their first round; he was so deeply consumed by the animalistic act that he was ready to swallow every bit of filth necessary to keep fucking her.
Delivering brutal, crushing thrusts against her ass, he stretched her tight ring to its maximum threshold before burying his entire length deep inside her interior, finally triggering something primitive deep within her subconscious.
The moment his glans slammed into a highly sensitive nerve cluster, she let out a piercing, ragged scream. Big Mac jolted slightly at the sound, but Twilight no longer had any doubts left in her mind.
“B-Break me…!”
The princess’s desperate plea was heard, claimed, and instantly accepted.
Big Mac nipped hard at her neck and began to pump into her with furious, scorching speed, his engorged shaft throbbing as if it were about to burst inside her. With his rapid, savage thrusts relentlessly bruising her rear, Twilight’s glutes turned completely flushed and raw, until Big Mac delivered one final, bottoming slam that buried his cock entirely to the root. Finally, he blew his load, shooting thick ropes of cum deep inside her like a high-pressure hose. Firing burst after burst of sticky, white seed, he completely flooded her tight, messy, overstretched channel until it was overflowing with thick cream, but Big Mac didn’t stop moving his hips. He made sure to drain every last drop of the pressure he had been holding back, everything that had been boiling in his heavy balls after going so long without a proper fuck. He needed to empty himself completely inside her.
He licked Twilight’s neck and nipped at her skin once more, until his final, pulsing bursts completely filled her tight ass, overflowing and leaking out past her dilated ring to drench her thighs.
A few minutes later, she finally went completely still, panting heavily with her belly visibly distended from the immense amount of cream Big Mac had pumped inside her.
Big Mac remained motionless for a moment… then carefully pulled himself away, feeling his chest heave so hard he thought his heart would burst if he didn’t rest.
Gently shielding his own slick, raw length, he waited for it to settle, running a hoof over his shaft until the overstimulated ache began to fade, and he finally collapsed to his side.
He looked over at Twilight, who was resting exhaustedly with heavy, sleepy eyes, though the enduring stallion was the only one truly taking in the full view of the aftermath.
The entire bedroom was completely wrecked, with stained book pages strewn across the floorboards and their mixed fluids splattered everywhere.
Still feeling a wave of protective worry, Big Mac shifted closer to Twilight and rubbed his muzzle affectionately against her neck. Twilight turned her head to meet him, offering a warm, dazed smile.
“Everything… is fine. I’ll clean it up, don’t worry.”
Twilight licked her lips and pulled Big Mac close to her flank, wrapping her forelegs around him in a tight embrace.
Big Mac sank into her touch, nearly collapsing his heavy frame right on top of her. He stayed pinned at her side, and she gently stroked his mane. “Seriously… you fuck like no other…”
Big Mac smiled… but just as he was about to speak, he felt a sudden, violent jolt snap through his entire body, as if a bolt of lightning had just struck his core.
He felt it instantly; his artificially enhanced, hyper-muscular physique began to shrink back to its normal dimensions. The intense aphrodisiac effects of the spell had finally broken.
When Twilight rolled over to look at him, her eyes widened in shock.
The sudden drain seemed to trigger a severe backlash within Big Mac’s body.
He gasped for air, his vision blurring instantly as the abrupt lack of energy ruthlessly took its toll on his system.
He lay there completely spent, desperately trying to catch his breath… until finally, his eyes closed and he slipped into a deep, involuntary sleep.
Twilight stayed right by his side, smiling softly as she stroked his head.
“I… I love you… I really do.”
***
When Big Mac finally woke up, darkness had already blanketed the land. He had no idea how, but he was back in his own bed, tucked inside his bedroom at Sweet Apple Acres.
Piecing together the hazy memories of everything that had happened, his jaw dropped as he wondered if the entire wild encounter had just been an intense dream, though his aching, heavy muscles told a completely different story. He desperately needed a drink of water, but right then, he noticed a sealed parchment sitting on his bedside table.
He also noticed that his coat had been thoroughly washed and cleaned, though it still carried the faint, musky scent of sex and his own semen. He blushed furiously… especially when he looked down and saw a few stray drops of dried fluids still clinging to his sheath.
Blushing even harder, he leaned over to open the letter, his tail giving a sudden, involuntary twitch as his head swerved to read the elegant handwriting.
It was a letter from Twilight.
“Please… if you have the time… I would love for you to guide me again, as my test subject… or… on a real date.”
Big Mac stared at the parchment, thinking that was all, but when he flipped the page over, he found a glossy print attached to the back.
It was a photo.
A highly explicit, detailed photo of Twilight’s plush purple rear, signed directly by the princess herself.
Big Mac’s face burned a volcanic red, his eyes locked onto her curves. On the reverse side of the image, a small note read: “So you don’t forget me. Please visit me soon.”
Utterly flushed, the stallion threw himself backward into his pillows.
That night, the heavy orchard chores that had been assigned to Big Mac went completely unfinished, as it seemed the big red stallion wouldn’t be stepping foot outside his bedroom until the following morning.
Applejack was forced to handle all the bucking alone, though she couldn’t help but notice that a powerful surge of residual unicorn magic was lingering around the house, specifically the unmistakable ozone scent of a long-range teleportation spell. She shook her head in confusion but shrugged it off, returning to her work.
Meanwhile, back at the library, Twilight looked over her notes, realizing her experimental formula still required a few dangerous adjustments. She simply smiled, redrawing the magical equations on a fresh scroll with far more twisted enthusiasm, after all, she had now permanently secured a massive stallion to happily test them on.
Perhaps one or two more volatile, botched attempts wouldn’t be a bad thing before she finally perfected it~