Ride Below the Crupper

Sneaking through the barn, moving at a snail’s pace, Apple Bloom kept one ear angled to the door and the other ear trained to the upstairs apartment. With Granny Smith, Applejack, Babs, and Little Mac away from the farm, visiting their extended family in Manehattan for the month, she was afforded a rare opportunity to sate her budding, unquenchable desires. She’d hugged Big Macintosh goodbye not ten minutes ago, before he’d left for town to get supplies, and immediately put her hastily, hormonally charged plan into play.

Up the stairs and through the front door, moving as quietly as she possibly could, she crept into her brother’s home and slowly moved through his living room. Though she felt a pang of regret for doing something so dubious, she simply couldn’t help herself. Being a lust-addled teenager, filled with all the righteous fury of a mare just coming into her prime, she had an itch that desperately needed scratching - an itch that only her big, virile, and beefy sibling could scratch.

As she reached his room, she paused. There was no way he was inside his chamber, having seen him off just a short time ago, but violating his sanctuary gave her a moment’s doubt. It would have been bad enough sneaking around behind his back, yet her self-serving motives made the task all the more difficult - that was until she happened to notice just what she was looking for. Her eyes settled on a pair of discarded briefs lying beside a dirty clothes hamper, causing her mouth to water.

She’d been interested in stallions since she hit puberty, though that interest had grown into an overwhelming lust as of late. Dating had done little to satisfy her urges, since both of her past relationships had been with guys who were too timid for her tastes, which had steadily driven her into a frenzy. As far as she was concerned, there was only one stud who checked every box on her list of potential partners, and she just so happened to see him each and every day.

Kneeling beside the bed, she reverently plucked the sullied underwear from the floor, lifted it to her face, and drew a deep breath through her nose. She’d been around her big brother for long enough to know just how good he smelled, especially after he’d worked up a good sweat, yet this was the first time she’d been so brazen as to sample the scent of his loins. The second his powerful musk tickled her sinuses, the deepest, most primal parts of her id went alight.

Throughout the entirety of her relatively short life, she’d never once met a stallion as perfect as Big Mac. A gentle giant, her sibling was easily the strongest and most well-built pony in all of Ponyville - heck, maybe even all of Equestria! Though his sheer size and build could be imposing to the uninitiated, he was honestly one of the kindest ponies around - that being said, she knew full well what he was capable of.

Ever since Babs had come to stay, after he’d inadvertently knocked her up at her graduation party, she’d been unable to stop herself from spying on the happy couple’s moments of intimacy. Even though they tried to keep their amorous affairs relatively quiet, the sound of two earth ponies going at one another like savage beasts in heat was impossible to avoid and, as such, she almost always knew when the two were making love.

She couldn’t count how many times she’d rubbed one out while listening to her brother plowing her cousin, and she’d peeped on them a good number of times as well, but that had only made her situation worse. Unfortunately for her, she’d reached a point where simply getting herself off didn’t do the trick; she wanted - no, needed something more substantial than that. Her sinful little scheme, concocted after hearing that most of her family would be away from the homestead, would hopefully satiate her licentious longing, and so she’d waited for just the right moment to enact it.

Draping his undies over her muzzle, flooding her nostrils with the potent, almost overpowering bouquet of his loins, she flicked open her boy shorts and slipped a hand to her nethers. Despite having been in her brother’s room for less than a minute, her marehood was positively dripping. As she wantonly crammed a trio of digits into herself, wearing his briefs like a depraved mask, she rested her back against the bed and caressed one diamond-hard nipple.

A small part of her felt bad for doing something so questionable - then again, the sheer unfairness of the situation bolstered her resolve. Babs was bigger than her in every possible way, from her stature and build to the size of her ass and rack, but it hadn’t always been like that. Before her cousin had gotten knocked up, she’d had a more impressive chest and derriere; much to her dismay, that all changed once the oafish mare had got an oversized bun pumped into her oven.

In short, Babs had flowered into a top-tier MILF seemingly overnight. With a pair of impressive sweater puppies, and a bit of pudge in all the right places, her cousin’s development and scandalous relationship with her brother had done nothing but fuel her jealousy. It wasn’t her fault that she was short, had a modest bust and unremarkable rump, and was a year younger than her kin, so she felt entitled to just a sliver of her sibling’s sexual energy.

“Oh gosh, Mac,” she groaned to herself, shoving a fourth finger into herself.

She’d only just become old enough to legally buy sex-toys, though her lack of funds or a place to procure such perverse goods left her wanting. While she could have sweet talked her way into getting a lay, taking advantage of one of her equally horny classmates, she knew it would be an almost laughable substitute for her burly brother. All but fisting herself, absentmindedly moving one hand beneath her shirt to play with her perky tits, she closed her eyes and envisioned being bedded by the carmine behemoth.

Having seen Mac’s package on several occasions, both in casual and lewd circumstances, she knew all too well how he’d earned the big part of his name. Simply put, her brother’s cock was more akin to a divine work of art than a simple appendage. Nearly as big as her arm and thicker than her wrist, his stallionhood sat at the apex of endowments - at least, it was as far as she was concerned.

Leaning back and bucking into her hand, she wriggled her hips and attempted to loosen her shorts. The affair would have been significantly easier if she’d stripped down, yet that would have been a dangerous move. Should Mac return home sooner than expected, she’d have to get dressed in a jiffy and come up with an excuse regarding why she was in his abode; she’d already concocted an alibi for such an event, justifying her presence by claiming she was looking for pictures of her nephew to share, but being caught with her pants down would be inexcusable, especially if she was discovered feverishly finger-fucking herself.

She could only imagine what it would be like to spend a night with him. Feeling his chiseled body against her, having him pin her to a bed and screw her into a coma, or even being able to lick his cum and her juices from his length were quite literally the stuff of wet dreams, and she’d washed her sheets enough to know. Engrossing herself to the fantasy, softly panting and caving to her passion, she was wholly ignorant to the sound of a closing door.

Mac grumbled to himself, cursing his memory for forgetting his wallet. He’d hoped to head into town to buy a few things, including some dinner for himself and Bloom, yet he’d headed off before checking his pockets. Famished from a day of hard work and frustrated from nearly two weeks of abstinence, since his lover was away, he marched up the stairs, into his living room, and towards his bedchamber.

Approaching his room, he slowed and cocked his head. He could’ve sworn he’d left the door open, since he typically only closed the thing when he was getting frisky with Babs, yet it was inexplicably pulled to. Dismissing the thought that someone was foolish enough to disturb the sanctity of his chamber, he stepped inside, flicked the lights on, and froze.

Resting against the bed, with her legs lewdly parted, was none other than his little sister. Finding her in his room would have been strange, but it didn’t take him long to realize exactly what she was doing. Wearing a dirty pair of his underwear like a mask, with one hand in her dampened shorts and the other up her shirt, she locked eyes with him. The situation was more than shocking, not for the least of which reasons being he’d never expected to stumble upon her in such a compromising state, and it left him reeling.

“M…M…Mac?” she stammered in disbelief, her mind clouded by her carnal wants.

Either she was experiencing some sort of lecherous hallucination or her brother had just walked in on her furiously masturbating to his undies - regardless, she struggled to comprehend what was happening. If the goliath had actually returned home so quickly, she felt certain she would have heard his lumbering footfalls, whether she’d been getting off or not, so she considered the alternative; if she was having some sort of suffering from sort of perverse delirium, well, she may as well see how immersive the experience was…

Rocking forward and onto all fours, letting his briefs hang from her neck like an indecent collar, she crawled over to his statuesque frame. He towered over her at all times, even when she stood on her tiptoes, so her penitent position made him feel even larger and more gargantuan than he already was. Reaching his feet, steadily rising to her knees, she ran her hands up his muscular thighs and to the enormous swell at his groin.

As her fingers graced the titanic swell under the denim of his jeans, she felt her pulse quicken. It was no mystery that he was packing some absolutely massive equipment, yet the heat of his dick against her palm, bleeding through the all too thin fabric, was enough to make her marehood angrily clench in anticipation. Wasting no time, flicking the button above his zipper, she pulled open the front of his pants and revealed the white cotton of his underwear.

The fact that he hadn’t budged or said a word lent weight to her assumption that she was imagining the encounter, spurring her onward and fanning the roaring inferno of her passion. Like a filly opening a gift on Hearth’s Warming morning, she steadily hauled his jeans past his hips and down his upper legs. Licking her lips, while his slacks fell around his ankles, she hooked her fingers over the waistband of his briefs and began to pull.

The garnet-colored root of his stallionhood appeared, followed by inch after magnificent inch of his shaft, causing her pace to quicken. He wasn’t even fully hard, yet it seemed like there was no end to his length! It was only after she’d brought the undergarment to his mid-thigh, clearing his groin, did the entirety of his tool spring free. To say she was awestruck would be an understatement, as she found herself face to face with the absolute behemoth that was his member.

Gazing longingly at his bare flesh, she drank in the sheer enormity of what he had to offer. A pronounced vein snaked along one side of his dick, his weighty nuts hung between his thighs, and the battering ram-like tip of his cock gradually rose towards her muzzle, yet those were only a part of the all-too-captivating experience. With his pants and underwear out of the way, the aroma of his loins struck her like a gong.

It may have sounded silly, but the smell and subtle warmth radiating off the stud’s body was vastly more potent than the scent which clung to his sullied briefs. Leaning in, very much in a trance, she caressed her cheek against his length and pressed her snout to the musky nexus between his endowment and ripe nuts. He was all hers, and she was going to do everything in her power to relish the monumental event.

Mac stood motionless, unable to do anything but watch his little sister venerate his package. Finding her masturbating to his underwear had been more than a little startling, yet having her spontaneously crawl over and begin worshiping him left him at a loss - still, as confused and anxious as he was, all the amorous attention stoked the flames of his stallionly desires. Subconsciously reaching for her head, with his body acting before his mind fully grasped the gravity of the situation, he pulled her forward and buried her nose in the flesh folds of his sheath.

The encounter was even more scandalous than when he’d first fooled around with Babs, yet his deep-seated, primitive urges were too much to bear. He’d already bedded and bred one family member, having gone so far as to rear an offspring with her, so helping himself to a second couldn’t be too much worse - could it? Feeling her hands sail to his hips, he watched her pull back and draw her tongue up his rapidly hardening shaft.

Unlike Babs, who was remarkably assertive in every facet of her life, Bloom was a bit more reserved - adventurous and willing to try new things, but reserved nonetheless. Whatever had gotten into her, she was clearly worked up and had him on her mind; in and of itself, this wasn’t a bad thing, but having effectively been blue-balled for the better part of a month greatly weakened his ordinarily stalwart resolve. As she leaned back and all but made out with the head of his cock, gazing up at him with her heavily lidded eyes, he reflexively bucked his hips.

Bloom gagged, her heart skipped a beat, and the depths of her sex seized upon itself, as he plunged into her muzzle. The sheer force of the move was enough to choke her outright, yet she did not recoil in the slightest. Tasting the sweat against his velvety skin, all but feeling the raw passion of his thrust, and sensing him throb against her tongue was all the inspiration she needed to commit herself. Ramming her head forward, forcing him down her chaste gullet, she quite literally choked herself on his softly pulsing length.

She’d dreamed of this moment for years, but she’d never once considered it would come true. Staring up at his face, in spite of her watering eyes, she reached for her crotch. Be darned if she wasn’t going to enjoy every second of fellating the glorious, godly stud, and she couldn’t care less what he thought of her ambitions. Feverishly toying with her clit, fighting through the discomfort of her stretched lips and strained esophagus, she pawed at her bulged throat.

It didn’t matter if she was imagining the entire event - the only thing she cared about was pleasing her adonic brother with every iota of her insignificant skill. Since she’d only ever gotten frisky on two occasions, sucking off and subsequently being rutted by one of the colts in her class, her experience with carnal affairs was direly lacking - nevertheless, her zeal and enthusiasm more than made up for her amateurishness. Driven by the overpowering might of her desires, she forced his shaft down her gullet.

The intensity, spontaneity, and pleasure of fulfilling one of her most guarded fantasies was enough to get her off, yet she failed to anticipate just how arousing it was. Her throat convulsed around him, tears streamed down her face, and marish nectar gushed from her spasming marehood, as she was wracked with an unforeseen and nearly catastrophic climax. Lost to the blissful sensations accosting her, while her vision began to tunnel, she was spared an ignominious fate.

Seeing her eyes flutter, realizing his little sister was on the cusp of passing out, Mac grabbed her shoulders and withdrew. It was one thing to let her sate herself with him, even if he was still unsure of how to feel about it, but he was not about to let her black out with his dick down her throat. Simultaneously stepping back and kneeling down, while he pushed her away, he brought himself to her eye level.

“Uh -” he falteringly began, seeing some lucidity come back to her, “are you ok?”

“Ah’m - Cough -” she croaked, wincing and swallowing down a cocktail of saliva and his pre-cum, “Ah’m fine! Ya didn’t have to stop!”

Churlishly turning her head, she scrunched her snout. Honestly, she wouldn’t have minded if he’d taken a more active role in the all-too-brief bit of oral, fucking her face like she was some common whore, yet he’d done the exact opposite. Glancing over at him, seeing the look of concern plastered on his handsome face, she knit her brow. She knew she should feel bad for making him worry, but his unease did little more than make her frustrated.

This was her moment with him, he was supposed to take advantage of her and ruin her for any other stallion, yet he had the gall to fret about her well-being? Not if she had anything to say about it. He already knew she had the hots for him - that or being discovered rubbing one out while wantonly sniffing his undies had flown over the big lug’s head - and she’d gotten a taste of his exquisitely terrifying cock. There was only one thing he could do to make it up for her, and she had every intention of goading him to get it.

Batting his hands away, freeing herself from his gentle grasp, she got to her feet and stood. If there was one thing she’d learned about her sibling, having keenly watched how he interacted with her stupid older cousin, it was that he had a soft spot for being provoked. Stepping to the bed, she cast herself onto the mattress with a soft Pomf, rolled onto her back, and lifted her legs.

If having a mare shamelessly present herself to him was what it took to get his motor running, that’s exactly what she was going to give him. Grabbing her ankles and pulling them back, using her youthful pliability to its full benefit, she displayed her winking, slavering marehood in the most slatternly fashion she could imagine. Feeling the warm juices of her arousal creeping down the cleft of her ass, over and around her taut, virginal pucker, she gnawed her lip and peered down her chest at him.

“Since ya ain’t got it in ya to dump a load inta mah stomach,” she purred, putting on the best come hither voice she could muster, “how ‘bout ya come over here and plow my field…”

Mac considered himself a worldly, albeit humble stallion. He’d seen all sorts of inexplicable and at times horrifying things in his day, ranging from nigh-omnipotent battles between demigods to the befriending a literal deity of chaos, but nothing could have prepared him for the sight of his very own sister inviting him to fuck her. His mouth watered, his stallionhood was so hard that it hurt, and thoughts raced, as he did his best to wrap his head around what was happening.

She’d made it painfully clear what she wished for, yet some small shred of his dignity and better judgement pleaded with him not to give in - sadly, he was losing ground to his impulses. She was a young, healthy, fertile mare, one who’d just asked him to screw her brains out, and he was having a hard time finding an excuse not to indulge her. It was no secret that his family tree circled around a few times, with his very parents being distant kin, so giving her what she wanted wouldn’t be the worst thing in the world.

As if moving of its own accord, one foot stepped forward, followed by the second, until he was looming over her at the bedside. Situated like she was, in such a vulnerable state, he drank in her figure. Broad, foal bearing hips that rivaled or even eclipsing his mate’s, a respectable pair of tits, and her pleading expression all chipped away at his resolve, but the rosy lips of her meaty and snug-looking marehood - stars above, he shivered at the thought of how tight she must be.

Leaning forward and grabbing her by the waist, pulling her ass to the very edge of the mattress, he straightened up, grabbed the base of his cock, and slammed his stallionhood against her groin. It seemed reasonable enough to let her know what she was about to get into - or rather what was about to get into her, so he draped his dick over her abdomen. If she didn’t have a change of heart, seeing that his dick would nearly reach her rib cage, well, he might just have to let her experience what Babs got on a regular basis.

Swallowing hard, Bloom stared down the cannon-like length of his stallionhood. The tip of his cock came to rest on her sternum, reminding her of just how utterly titanic his endowment really was. The rational part of her brain screamed at her to stop, to politely bow out and reconsider finding a stud who wouldn’t rearrange her insides, but the deeper portions of her psyche cheered her on, telling her that if her boorish cousin could handle him, her very own brother, so could she.

Slipping her hands down her thighs and to her groin, she spread her marehood open, forced a cocky smirk, and winked up at him. “Ah can guarantee that I’m a whole lot tighter than Babs…”

The statement, while factually correct, was the best sort of intimate enticement she could think of, and it immediately did the trick. Stepping back, dragging his prodigious tool down her belly and neatly shaved crotch, he brought the head of his dick to her entrance. It felt like a fist pressing against her cunt, prompting her to gulp yet again. Swiftly grabbing her ankles once again, pulling her feet to either side of her head, she screwed her eyes shut, exhaled her held breath, and prayed she’d be able to handle him.

Sure enough, the pressure on her snatch mounted. It was like squaring off against a glacier, slow but nigh unstoppable in strength, so all she could do was try to stay relaxed. As the strain on her entrance increased, subconsciously causing her to set her jaw, she momentarily considered massaging her clit or playing with her nipples, if only to serve as a pleasant distraction, though the thought lasted only a fraction of a second. Seemingly out of nowhere, catching her completely off guard, her undertaking bore fruit.

Something gave way and nearly two-thirds of his stallionhood instantly slammed into her canal. The sensation of something so big filling her so quickly was more than she could endure. Her mouth flew open, her eyes rolled wildly to the back of her head, and marish nectar squirted from around his entombed length, as she came with all the devastating force of a tsunami. How anyone could withstand something so mind-boggling was beyond her, and he’d only just stuck his dick inside of her! Willing herself to stay conscious, forcing her trembling hands to hold her lower limbs in place, she fought through the tide of rapture.

Mac smirked at her reaction, yet he gave her a minute to recuperate. It wasn’t the first time he’d made a mare squirt simply by penetrating them, and it was the second time he’d had it happen with a family member, so he knew enough to let her savor it. Seconds passed, her quaking gradually abated, and he shot her a questioning look; her faltering nod was all the reassurance he needed, prompting him to roll his hips back.

Seeing her rosy interior clinging to him, almost as if she was fighting his retreat, was one of the hottest things he’d seen in ages. Fully aware that he wasn’t dealing with Babs, a mare who could and often would vie for dominance in the bedroom, he took his time and eased his colossal stallionhood into his sister. Peering down at her belly, watching the imprint of his cock lazily move up her torso and past her navel, he relished the vice-like feeling of her silken interior.

He figured she’d be pretty tight, yet he’d failed to predict just how taut her marehood was. Carefully administering just enough force to continue, moving deeper and deeper, he only stopped when he bottomed out. He was actually amazed about how accommodating she was, given her meager size, which did little to quell his mounting lust. Bending forward and resting his hands on her thighs, driving her legs further back, he set to plowing her at a leisurely pace.

It took more concentration than he cared to admit to keep himself from pulling out the stops. Not only was she the smallest mare he’d ever been with, but he was her cherished sibling - both facts that paradoxically got his blood pumping and made him reluctant to go all out. Grappling with his natural tendency to conquer, a trait Babs had instilled in him, he unwittingly increased the speed of his pounding hips.

Drool crept from the corners of her mouth, her refractory period all but vanished, and whorish groans escaped her with each thrust, as Bloom’s mind went blank from the pleasure. Be it from the enormity of living out a fantasy, having her marehood stretched to the breaking point, being fucked by her brother, or knowing that she’d more than likely damned herself to only ever be satisfied by only exceptionally well-hug stallions, or some combination of the four, she fixated on the rapture her brother afforded. Hooking her elbows around her knees, keeping her lower limbs in place, she masochistically pulled and tweaked her nipples.

Even though it wasn’t her first time being bedded by a stud, she may as well have been a virgin. The difference between her past fling’s stallionhood and Mac’s was night and day, making her only prior lay feel almost pathetic in comparison to the wondrously intense pleasure her elder sibling afforded. With the breath hitching in her throat, teething on the brink of another climax, she twisted her teats and pushed herself to her limit.

“Ah…Ah’m gonna - Nnnnnghaaaa,” she wailed, sailing over the edge.

Her toes curled, marish juices lewdly squelched from her pummeled cunt, and she howled out in bliss. Though she’d cum only a few minutes prior, the second orgasm was as or more intense than the first, threatening to rob her of her waning sanity. Try as she might, the ecstasy robbed her of strength, leaving her arms to fall limply by her sides; she would have been bothered by her lack of self-control, had the titan’s hastening tempo and increasingly forceful plunges assured her that he was far from finished.

Despite his best efforts to curb his enthusiasm, his little sister’s second orgasm drove Mac into a frenzy. His muscles tensed, as each thrust drove her into the mattress. Hailed by her slatternly mewling, milked by the contractions of her spasming depths, he snorted imperiously above her. There was only so much provocation a stallion could endure, and he’d been pushed past the threshold of his waning discipline.

The orchestra of the groaning bed frame, feminine whimpers of delight, and sonorous grunts echoed through the room and out of the apartment, mirroring the sinful symphonies of many nights before, but this was different - this was an epoch. Though both knew they’d crossed a line, enacting a taboo nigh unspoken of in society, neither Mac nor Bloom could have fathomed the gravitas of what they’d done. Unbeknownst to either the hulking stallion or the svelte mare, they each left a mark on one another - a mark which would ultimately shape their future.

Breathing in his sibling’s delicate scent, the smell of sweat, and the aroma of hot, bestial sex, Mac reached a tipping point and was left with two options; he could pull out and douse her with his load, painting her body with his thick, rich spunk, or he could bury himself as deeply as possible and despoil her like none ever had or possibly ever would. The decision took less than a second, with his faculties reduced to only their baser functions, and so he moved on autopilot. Leaning forward, locking her arms under her legs, he plunged his entirety into her.

The sensation of her womb being breached, her cervix giving way and clamping around his pulsing length, drove her to a third climax, but the sensation of his seed flooding into her, filling her foal-factory with an unimaginable amount of seed fractured some fundamental part of her mind. To say she had a fourth climax couldn’t be accurate, so great and unimaginable was the experience of being bred by a paragon of masculinity, yet it was the only word that came close to describing the experience. Braying like a beast possessed, slipping into the oblivion of a sea of pure, unrefined rapture, she lost consciousness with one final, ineffable thought - she was going to be a mother.

Groaning and steaming the air, while his hips fitfully twitched and bucked, Mac ensured every drop of his precious essence was deposited within his mate. Slowly but surely, with his bliss gradually replaced by a warm sense of euphoria, his senses returned and brought with them a number of jarring realizations. First and foremost, at some point or another, Bloom had blacked out - secondly, having released her legs to push himself up, she looked positively gravid with his jizz - thirdly, but possibly most importantly, he grasped that there was a very real likelihood that he’d just knocked his sibling.

Rocking back and dragging his softening length from her quivering marehood, he watched a small tide of cum surge from her battered entrance - still, even after the effluence subsided, she could easily pass for being pregnant. Feeling his heart starting to race, he looked about in a panic. If Babs found out he’d cheated on her, he’d be dead - if AJ found out he’d fucked their sister, he’d be dead - if Granny found out he’d plowed her grand daughter, he’d be dead - irrespective of the circumstances, if any of his family found out what he’d just done, he would be well on his way to an early grave. Thinking fast, he scooped up his comatose sibling and rushed to the bathroom.

As he stepped into the tub and kicked at the faucet, he fumbled for the shampoo with his free hand. If he got her cleaned up, back on her feet, and possibly pleaded for her to keep her mouth shut about the ordeal, he might - might just get away with only a guilty conscience. Seeing her stir and look up at him, with water streaming down her face, his spirits momentarily lifted - that was until he saw her reach down and caress her distended belly. Her words sent a chill through him, both on a physical and psychological level, and rang through the washroom like a death knell.

“Ah’m gonna be a mom!”