Dump Truck Ass

by Jest

Rating: mature
Tags: Sex, Big Macintosh, Random, My Little Pony: Friendship is Magic, Porn, Prince Blueblood
Length: 4406

Big Macintosh is in Canterlot to help get his family's debt erased. Thankfully a certain local prince is there to assist the farm stallion, provided he puts that absolute dump truck of an ass to work.

Big Macintosh is in Canterlot to help get his family's debt erased. Thankfully a certain local prince is there to assist the farm stallion, provided he puts that absolute dump truck of an ass to work.

kinks: male on male, cumflation, slight stomach bulge, jockey (stallion riding on the back of the stallion hes fucking), some minor futa on female and talk of impregnation, public sex, and the weirdest foot race you ever did read.

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Published 2021-07-23 21:30:02 UTC
Last updated 2021-07-23 21:30:02 UTC

The One, The Only, Chapter.

Big Macintosh shifted uncomfortably within the hard confines of the wooden chair he was seated on. It wasn't actually that unpleasant of an experience, as the stallion had an absolute dump truck of an ass which made any seat acceptable. Rather it was the continued silence broken only by the occasional humm of thought coming from across the desk that made him feel so out of place.

The blonde maned and white furred stallion sitting across from him was a bit smaller in person, though he was no less handsome. With a well built physique, and a certain unspoken charm, the prince’s mere presence was enough to make Big Mac a little hot under the collar. Though that might have been the stallion’s own nervousness that was causing the temperature of the room to slowly rise.

“I think I’ve seen all I need to,” Prince Blueblood declared, setting aside the mass of papers Big Macintosh had given him only a few minutes earlier.

“And?” Big Mac inquired.

“Your request for loan forgiveness is a good one, but before we get into that I was hoping to make you an offer,” Blueblood began, steepling his hooves and smiling at the stallion across from him.

“Go ahead,” Big Macintosh prompted.

“I want to fuck you. And not just fuck you but I want to strap a saddle to your back and ride around on you, pumping you with cum for hours on end,” Blueblood casually remarked. “In return for making my day I will personally clear you and your family’s debt.”

Big Macintosh’s jaw hung open, a blush crossed his face, the farm pony gaping silently, baffled by the stallion’s suggestion.

Prince Blueblood continued without pause. “This is of course not your only option for getting rid of your debt. You could for example join the guard for a minimum of two years. You could also sign up for a payment plan that would enable you to effectively freeze the interest while you pay it off in installments.”

“But!” Prince Blueblood interjected before Big Macintosh could even speak. “I promise you that I won't make you do anything you don't want to do. Nor will I force you into a situation you disagree with.”

“Err… hmm,” Big Macintosh frowned.

“I don't want to think as though this is some kind of blackmail situation either. I merely saw you at a certain club the other week and I can't stop thinking about you,” Prince Blueblood exclaimed, leaning forward on the desk.

Big Macintosh blushed harder, memories of the Bucking Bronco coming to mind.

“I mean I saw you looking at least. So I feel like you’re at least a little interested,” Blueblood pressed, smiling even wider.

Big Macintosh coughed into his hoof. “Eeyup.”

“So you’ll do it then?” Blueblood questioned.

“Eeyup,” Big Macintosh replied.

“Excellent!” Blueblood exclaimed, clapping his hooves together excitedly. “Now then let's get this day started shall we?”

“Now?” Big Mac questioned.

“Unless you have something better to be doing?” Blueblood replied.

Big Macintosh hummed thoughtfully before shrugging. “Eenope.”

“Excellent, let us begin,” Blueblood declared, the stallion extracting himself from his desk and inadvertently making Big Mac’s jaw drop.

For the second the prince’s body was in full view, the farm pony got a view of the other male’s enormous erection. One that was both bigger than his own, and was so massive that the unicorn had to lift it using his magic lest it drag on the ground. Worse still, it didn't even look completely erect and already it was the biggest dick Big Macintosh had ever seen.

“I use a personal invisibility field while out and about as it were,” Blueblood explained while retrieving several straps from a filing cabinet. “It helps to keep people from staring at my dick all day and night.”

“Eeyup,” Big Macintosh muttered.

“Now then, please stand up,” Blueblood commanded.

The farm pony couldn't help but comply, rising from his seat and walking over to the spot the unicorn was pointing to. While he moved, Big Macintosh continued to stare, silently marveling at just how well hung the prince was. It was inequine, and made the farm pony feel small in a way that was so arousing that he could barely contain his own budding erection.

“It seems like someone likes what he sees,” Blueblood teased.

“Eeyup,” Big Macintosh murmured.

“Stare all you like, because it won't be long before this monster is jammed inside that fat juicy plot of yours,” the prince remarked.

Big Mac was so overwhelmed by the forcefulness of the statement that he could only stand there awkwardly. The prince had no such qualms however, and swiftly strapped a saddle to the earth pony’s lower back. With an ease that spoke of vast experience, Blueblood had the other male ready to go within mere seconds.

“There we are. Now for my favorite part,” Blueblood exclaimed.

Big Macintosh turned his head and watched as the other male retreived a step ladder hidden behind the door of his office. Placing it behind Big Macintosh’s ass, the male stepped up, only to almost immediately stop, a wide grin crossing his face.

“Hot damn you got an amazing ass,” Blueblood declared, smacking a hoof across Big Macintosh’s plot. “Damn, and it jiggles like a bowl of jelly. Why I bet if you flexed it would be as hard as a rock.”

Big Macintosh did so, confirming the prince’s assertion, and earning him another whistle from the other male.

“I hit the jackpot here. Now then, shall we continue?” Blueblood inquired.

Big Macintosh nodded awkwardly, unable to mutter even a single word.

“Now then, this might feel a little funny, but this lube is the best my bits can buy,” Blueblood stated.

Big Macintosh observed as his partner retreived a glowing green bottle from another drawer. Popping the top, the unicorn then drizzled a healthy line of the stuff all the way down his cock. He then gripped the red stallion’s tail and pulled it aside before squirting a large glob onto the stallion’s hole.

The earth pony was barely able to resist the urge to shudder, the strange liquid oddly slippery while somehow having the consistency of pudding. Blueblood wasted no time, and quickly mounted his partner’s back, using his cock to align himself with the red stallion’s ass. There he waited for only a few seconds, silently enjoying the sight before pushing himself forward firmly.

The head felt like a battering ram against Big Macintosh’s asshole, the earth pony letting out a low moan as he felt the tip begin to push its way inside. Despite the fact that the unicorn’s appendage was nearly as thick as his hoof, the farm stallion was able to take it relatively easily. It only took several short thrusts before he felt the entire thing pop into him, stretching his ass in a way that nothing else ever had.

“You must be quite the size queen. Usually it takes three times as long just to get inside,” Blueblood remarked with a chuckle. “I can already tell this is going to be a fun afternoon.”

Big Macintosh bit his lip and said nothing, his blushing face doing all the talking that his mouth could not.

The prince meanwhile, was busy readjusting his grip, and swiftly got back to pushing himself forward once more. His thrusts were small, firm, and had a certain power to them that Big Macintosh couldn't help but fall in love with. Each one pushed a bit more dick into the farm stallion’s back door, which itself steadily stretched around the massive invader.

Over and over Big Macintosh felt as though he was about to reach his limit, only for the prince to push a little harder forcing a little more to slip inside. Within only a few seconds Big Macintosh was fuller than he had ever been before, and a glance over his shoulder confirmed there was a lot more left outside of him. Stifling a moan, the towering earth pony steeled his resolve and readied himself for the next powerful thrust.

It took several more readjustments but in the end Prince Blueblood was able to slam his hips against his partner’s flanks. The ensuring jiggle made the unicorn release a throaty moan and a wide, prideful smile to spread across his face. His enormous turgid length was now sheathed completely in the other stallion, snugly stuffing the poor male to the absolute brim.

Shifting his hips forward, the stallion was able to seat himself across the other stallion’s back as best as he could. Wiggling himself slightly, the prince was confident that he was as secure as he was going to get.

“Mmm how does that feel?” Prince Blueblood inquired.

“Full,” Big Macintosh replied, the earth pony shuddering in barely contained ecstasy.

“Ahh yes. That will happen I’m afraid,” the unicorn remarked. “Not too full I hope?”

“Eenope,” Big Macintosh answered.

“Excellent then, now before we go, you may wish to take a peek between your legs,” Blueblood offered. “Trust me. It's a sight you’ll enjoy.”

Big Macintosh furrowed his brow, but did as he was told, leaning down and peering between his forelegs. Ignoring the slight pleasure that came with feeling his lover’s massive erection shifting around inside of him, Big Macintosh gawked at what he saw. Somehow despite the farm pony’s titanic size, the prince was bigger still, with the unicorn’s cockhead being visible through his stomach.

Big Macintosh was fairly certain that he could even see the other male’s veins, the indent was so massive. It was a sight that made a lump grow in the farm pony’s throat, and a heat to bloom in his loins. His own cock throbbed needfully and dribbled pre yet refused to reach full mast, as if his body had subconsciously submitted itself to the prince.

“Ready?” Blueblood offered, patting the other stallion’s side.

“Eeyup,” Big Macintosh replied.

“Then let us go down to the street. I think I’ll enjoy a nice walk before riding you home,” Blueblood exclaimed.

Big Macintosh nodded meekly, his body following the unicorn’s commands before his mind could even catch up. The first thing he needed to do was just turn around and open the door, a process that took several rather awkward seconds. The feeling of having something so massive shift around inside of him was quite intense to say the least, and was somehow incredibly pleasurable.

Each step was like the unicorn was thrusting inside of him, and each time he shifted forward, another bolt of pleasure shot up Big Macintosh’s spine. Despite struggling with how good he felt, and the strangeness of the situation, Big Macintosh managed to clear the threshold. Only to run into another obstacle that he had somehow not been cognizant of, namely the guards waiting for him.

Prince Blueblood on the other hand, had no such shame. “Greetings gentlecolts. I will be clocking out early as it were so you are free to leave.”

“Oh uh… thanks?” one of them murmured.

“Damn dude, that's hot,” the other, slightly shorter one remarked.

The unicorn lightly kicked Big Macintosh in the flank. “Let us continue my steed.”

Big Macintosh grunted and trotted forward, both embarrassed as well as aroused by the brief interaction.

Behind him, just out of ear shot, the two guards continued to stare.

“So uh… you wanna fuck?” the taller one asked.

“Only if I get to ride you around like that,” the shorter of the pair replied.

“Fuck I was hoping you’d say that,” the first muttered.

Big Macintosh was too busy focusing on simply walking to even be aware of this brief interaction. In fact the only thing he even thought of was his partner’s enormous cock and the hooves in front of his face. Repeating the simple motion of stepping further down the hall was enough to take all his focus, and it was all he was capable of.

In time he got used to this, well about as used to something as one can get when their guts are stuffed full of horsecock. That was until he reached the first set of stairs, and the stallion felt his stomach fall out the bottom of his body.

“Damn,” he muttered.

“Come now. It's not that hard. Why I bet I barely weigh more than a pea to you,” Blueblood offered.

Big Macintosh blushed hard, unable to utter a word as he grappled with the situation set before him. Inhaling deeply, the stallion put one hoof in front of the other, jostling his rider with every step he took. Which only shifted the cock wedged inside of him even more, inadvertently bumping against a particularly pleasurable area.

That forced him to stop, though he quickly resumed his solemn march, which eventually ended with the earth pony standing on the bottom step. Breathing a sigh of relief, Big Macintosh felt a sense of relief well up inside of him, that was until he looked over and noticed there were more stairs. Not only more, but two more flights which ended in the castle lobby, where many, many ponies were milling about.

“Come now, we musnt tarry. I don't want to be forced to keep you so long that you miss your train back to Ponyville tonight,” Blueblood exclaimed.

Big Macintosh sighed, even while a blush burned across his crimson features. “Eeyup.”

The earth pony huffed and puffed as he walked down the crowded city streets of Canterlot. On his back, prince Blueblood continued to smile as if he werent balls deep inside of another stallion. Who was not suffering from fatigue quite yet, but rather an incessant burning need which was becoming harder and harder to ignore.

With each block they walked, and each minute that passed, his orgasm grew stronger. Though the earth pony had grown used to the curious looks shot his way, he couldn't bring himself to finish in front of so many. Even if the cock throbbing within his hole made him want nothing more than to break down and coat the pavement in cum.

“You are close, aren't you my laconic lover?” Blueblood inquired.

“Eeyup,” Big Macintosh muttered.

“Then what is the matter? Finish, and we can do so together,” Blueblood encouraged.

“Eenope,” Big Macintosh replied.

“Embarrassed? Well you shouldn't be. The ponies of Canterlot know better than to let foals out at such hours,” Blueblood declared.

Big Macintosh frowned, silently realizing that he hadn't seen a single pony that didn't have their cutie mark yet. None even seemed particularly young, giving further credence to the prince’s assertion. Still, it wasn't quite enough to relieve all of the stallion’s anxiety, and he continued to grumble as he trotted on.

“Come now. Don't be so stubborn. If you need to go somewhere slightly private then head behind those dumpsters for a quick pit stop though I should warn you. I don't intend on pulling out until later tonight,” Blueblood exclaimed.

Big Macintosh blushed as he glanced down to a nearby alley, noting that although there were a pair of dumpsters they werent very big. In fact he would still be in plain view of anyone who happened to took in his direction for whatever reason. After quickly realizing that it was the best he was going to get, Big Macintosh trotted towards them, awkwardly crossing the street in the process.

Coming to a rest with the majority of his back half blocked off by the dumpster, Big Mac let out a sigh of relief.

“Now then, prepare yourself, because I intend on enjoying this,” Blueblood declared.

His partner didn't have long to consider the other stallion’s words as mere moments later, the prince drew back his hips. The sudden feeling of emptiness that the farm pony felt was quickly snuffed out when Blueblood drove himself forward once more. It was short, hard, and fast, yet Big Macintosh couldn't help but moan despite the strange circumstances he was in.

It was too much for the stallion and like a runaway train his orgasm came barreling closer with each passing second. The unicorn on his back wasn't about to let it come slowly though, and with his hooves locked tight about Big Mac’s barrel, Blueblood pounded away.

Each dull thump of their hips meeting was punctuated by the loud slap of Blueblood’s enormous balls impacting Big Mac’s own. It was also broken up by the occasional startled gasp of surprise that came from the earth pony, and the hearty moan which originated from his lover. Thankfully the smell of garbage never reached Big Macintosh’s nose, allowing his every sense to be consumed by sex.

Even his thoughts were eaten up by the act, as he was incapable of doing anything but standing there and gently rocking his hips. That was until he felt Blueblood’s cock begin to flare, somehow stretching his hole even more than it already had been. A titanic feat which was only eclipsed by the elephantine load which was already on its way into the earth pony’s belly.

Big Macintosh grunted, and braced himself against the wall, his own still semi erect cock pumping out a steaming load directly onto the ground. While his lover grunted and twitched atop his back, the prince’s dick erupted with enough seed to put out a small campfire. Each spurt was hot, and so deep that Big Mac knew it would not leak out, until the prince was done with him of course.

This continued for several long seconds until at long last Big Macintosh felt that he had given it his all. The prince however, was not done so soon, and took nearly a full minute before his cock stopped twitching. When it did, Big Macintosh could feel that his belly had rounded ever so slightly, losing some of its well muscled definition.

“Now then. Let us continue back to my estate. I wish to refill my fluids, and enjoy your company in a more private setting,” Prince Blueblood exclaimed.

“Eeyup,” Big Macintosh grunted, steadying his hooves once more.

The earth pony took several steps back towards the road, only to note the small sloshing sound he could hear coming from his belly. Poking a hoof against the bulge, Big Mac silently wondered how big he was going to get before the day was done. A thought he ruminated on for several long seconds before eventually pushing it out of his mind.

“Ready?” Blueblood asked.

“Eeyup,”

“I say it's quite a wonderful day isn't it mister Macintosh?” Blueblood asked.

Big Macintosh blinked rapidly, only now realizing that he had phased out for several seconds. The feeling of getting another load dumped inside of him had been more than enough to distract the earth pony. Who now looked around to realize that he was walking next to several other ponies, one of whom he recognized.

Rarity was sitting astride the back of one of her employees, the name of which eluded the stallion. She had a long orange mane, a brilliant golden saddle, and a short black dress which covered very little of her teal fur. It also didn't cover up the fact that Rarity currently had her futa cock buried balls deep in the other pony’s ass.

The other two ponies were both stallions, neither of which Big Macintosh had ever seen before. One’s fur was grey, and had an enormous white mane that hung down around the fluffy collar he wore. The earth pony’s reflective purple sunglasses hid most of his expression, though they werent enough to obscure the pleasurable look on his face.

Which was no doubt due to the smartly dressed unicorn stallion with a flowing sky blue mane which sat astride his back. From the straps and saddle, Big Macintosh was easily able to discern that the prim and proper noble was deep in his steed’s ass.

“Right my dear?” Blueblood prompted.

“Eeyup,” Big Macintosh remarked.

“It was quite the stroke of luck to see you out and about today. Here I thought I was the only one who enjoyed riding their employees,” Rarity exclaimed with a wicked smirk.

“It seems like there are others who enjoy being a pain in the ass,” her ride remarked without any venom.

“Ohoho. Someone wants to bear another of my foals. What would that make now Sassy?” Rarity retorted.

“F-five,” murmured the mare.

“As enticing as this little back and forth has been,” the suit wearing unicorn began. “I was hoping to make a game of our little meeting.”

“Oh you know I love games,” Blueblood replied.

“Eeyup,” Big Macintosh agreed somewhat hesitantly.

“I got the idea from a dear friend of mine. You might know him, Jet Set,” added the unicorn.

“He is an absolute gem,” exclaimed his earth pony mount.

“Well let's hear it,” Blueblood offered.

“It's quite simple really. We engage in a short race, only we don't leave the comfort of our saddles,” The mustachioed stallion explained.

“Oooh quite intriguing,” Blueblood remarked.

“We are in darling,” Rarity immediately declared.

“What do you say, Mr. Macintosh. Would you be interested in showing up a couple of canterlot ponies?” Blueblood teased.

Big Macintosh hummed thoughtfully for a moment before nodding. “Eeyup.”

“Excellent, then how about we begin from the start of the next block,” The tuxedo clad stallion offered.

Big Macintosh glanced further down the road and noted that the sidewalk was clear, and traffic was non-existent. Which made sense considering that they were now deep in the noble district, and most passersby were in carriages. All of whom kept their blinds pulled and their faces obscured from anyone who may look in on them.

Stopping at the beginning of the next block, Big Macintosh noted that his fellow racers were ready as well. He also noticed that no one was sporting quite as big a cum belly as he was, the earth pony almost looking pregnant at this point. His fellow earth pony with the shades had a small paunch visible, while Rarity’s mount was a close second behind Big Mac.

The sloshing sound the farm pony had ignored up until now returned, and the stallion was forced to realize just how loud it had gotten. He pushed that thought away, and focused on simply getting his well used muscles ready for the run ahead of him.

“Is everyone ready?” Blueblood offered.

“I feel like a kid dashing home from school,” the monocled stallion remarked.

“Oh what fun. We are ready when you are,” Rarity added.

“On three. One, two, three!” Blueblood exclaimed, punctuating the final word by kicking his mount lightly on the backside.

Big Macintosh didn't need the extra oomph, but it turned him on nonetheless, his flaccid cock slapping against his cum filled stomach. Sprinting forward, the earth pony took an early lead, though the stallion noted that the others werent far behind him. Burdened by such an enormous amount of cum, Big Macintosh wasn't sure how long he could keep up the pace, but he pressed on regardless.

Something about beating two canterlot born ponies spurned his pride in a way that not even his embarrassment could not diminish. Even if that enthusiasm was somewhat curbed by the pleasure which rocketed through his body with every thunderous step. The prince’s cock seemed intent on hitting every enjoyable spot in the earth pony’s body, sending him to the brink of orgasm within only half a block.

Pushing down his desire to cum, Big Macintosh poured on the speed.

After passing that halfway point, the earth pony noted that the two other males were beginning to slow down. The shades had fallen down his running mate’s nose, revealing that his eyes had rolled into the back of his head. A heavy spurt of seed splashed against the ground, and his steps began to slow while also growing erratic.

Rarity and her mount showed no such sign of slowing, and picked up the pace until they were nearly side by side with Big Macintosh. His pride now spurned, Big Macintosh ignored how good he felt, the sound of hot breathing in his ear, and the loud sloshing originating from his stomach. In order to run as fast as this awkward circumstance could allow of him.

The long legged mare he was racing against wasn't about to let him win that easily though, and she too pushed herself. Until Rarity moaned louder than usual, and the sound of cum splashing into her mount’s belly could be heard over the pounding of hooves. With the two mares briefly distracted, Big Macintosh pulled ahead, and ultimately passed the stop sign first.

His chest heaving, the earth pony slowly trundled to a stop, cumming the instant his body came to rest. He wasn't the only one though, as prince Blueblood let out a cheer before his cock begin to shoot another piping hot load into the farm pony’s backside.

“You did it mister Macintosh. Truly you are an incredible specimen,” Prince Blueblood exclaimed.

“Eeyup,” Big Macintosh muttered as best as he could.

“Say I don't mean to be presumptuous but after our little deal is done would you be interested in joining me again sometime?” Prince Blueblood inquired, shifting slightly on the other stallion’s back. “That is if you desire to join me.”

Big Macintosh smirked. “Eeyup.”

Author's Note

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