Diminishing Returns
“Shining, I’m home!” Cadance called out. “The meeting with Twilight ended earlier than expect…”
Shining froze, as did the half-dozen stallions on or around him. With a ball-gag stuffed in his muzzle and lashed to his head, he peeked back at the doorway with a wide, fearful eye. Cadance wasn’t supposed to be home for another day, making her sudden and wholly unexpected appearance a bit awkward - not because he wasn’t happy to see her, but because he’d been indulging himself in her absence.
The gargantuan cock lodged in his ass pulsed, sending another gout of seed deep into his ass while his stallionhood leaked cum to the floor. Being trotted in on by his wife as he was getting off would be bad, being found servicing a stud would have been worse, yet Cadance’s timing couldn’t have been more terrible. Breathing hard and staring back at her, he stiffened when her expression of shock shifted to one of utter disdain.
“So that’s how it’s gonna be…” she growled, storming over as her unwanted guests parted before her. Coming to a stop directly behind him, while the stud who had been balls deep in his upturned tush dismounted, she sneered. “Alright, slut, if you want to be treated like a mare that much, let’s make it happen!”
Shining swallowed hard as he tried and failed to clench his gaped, slickened backdoor. While a small stream of jizz seeped down the cleft of his tush, over his balls, and onto the mattress, his mind began to race. He loved Cadance more than anypony - heck, he wouldn’t have married her if he hadn’t, but it looked like he’d pushed her just a touch too far by being the center of a gang-bang.
Turning to the exit, Cadance leveled a hoof at the stallions who were silently creeping to the door. “No, none of you are leaving.”
Shining had been with her for long enough to know when he was in trouble, and he was definitely in trouble this time. She was well-aware of some of his more perverse interests, having pegged him a few times and even surprising him with a new sex-toy every now and again, but he’d never cheated on her before - well, she didn’t know that he’d cheated on her before. Much to his shame, this wasn’t the first time he’d snuck a stallion into the castle while she was away.
He’d tried - oh how he’d tried to break his habit of fooling around with studs, but the allure was too strong for him to bear for long. As nice as it was to bed his wife, feeling her hot, silken interior caressing his length while they made love, it simply didn’t compare to being pinned down and fucked into a coma. Glancing back to the big, burly stallion who’d just been rutting him like he was a lucky filly on prom night, he winced when Cadance stamped a hoof.
“You couldn’t even have asked me?” she demanded, staring daggers at him.
Timidly meeting her eyes, he pinned his tail to cover his sullied backside. “Mmmph phfff mph.”
Darn it - stupid gag! Without the use of his magic, having had his myriad of playmates adorn him with a negation ring purely to make him more compliant than he already was, he couldn’t even respond to Cadance in any meaningful way. The second he went to move, to push himself up and face her, her aura surrounded him and held him to the bed.
The faint, pink glow of Cadance’s magic concentrated into bands of sorcerous binding that wrapped around his body and kept him from escaping. He had no doubt that he was in a tricky situation, but his anxiety spiked when he noticed arcane runes appear on his ethereal bonds. She wasn’t just holding him down, she was planning on doing something to him.
Stepping over and onto the bed, she brought her curled lips to his ear. “I’m not mad - in fact, I’m happy to see this side of you,” she hissed. “How about we play a game. Considering you don’t seem to be using this,” she continued, reaching down and running a forehoof along his rigid length, “I’ll make it shrink every time you cum.”
He whimpered as the magical bands coiled around his balls and stallionhood. She’d mentioned something about him being treated like a mare, although it wasn’t until that moment that he started to put it all together. With a pit forming in his stomach, he peered over at her face.
“Don’t worry, it won’t be permanent - at least, it probably won’t be permanent,” she chuckled. Trotting ahead and rolling to her side, she hiked a hind leg and unabashedly displayed her groin. “To make this extra interesting, I’m going to make your ass and prostate extra sensitive.”
With streaks of saliva creeping down his chin, he watched as she began rubbing herself. He’d presumed she was angry, but getting a good look at her sopping wet nethers gave him a moment for pause. Contrasted against the downright sadistic smirk plastered on her face, her winking marehood and perky nipples were an undeniable testament to her arousal.
She giggled like a school filly when her sorcery crept into his quivering, battered pucker. “To sweeten the deal, and because I’d hate to take anything from you without giving something in return, I’ll make your balls just a bit bigger whenever you blow a load.”
Though he couldn’t exactly see everything she was doing to him, he could sure as heck feel it. A tingling sensation radiated from his depths and into his groin, making it hard not to get excited. He clamped his eyes shut and attempted to wriggle free, writhing against his sorcerous restraints - alas, it was no use.
“What’s the matter, babe?” she snickered, reaching out and drawing a forehoof up his chin. “To be sure, a big, studly stallion like you doesn’t have anything to worry about - that is, unless you want to end up with a nub of a prick…”
The thought of having his stallionhood stolen from him, reduced to a button mushroom, was as terrifying as it was thrilling. He’d be the first to admit that he enjoyed being on the receiving end of things, but that didn’t mean it wanted to completely commit himself to being a warm, welcoming set of holes for big-dicked studs ~ right? Cracking one eye open to look over at her, praying she’d bring what hoped was just a cruel joke to an end, he fell motionless when he realized he wasn’t the only one being affected by her magic.
Where once Cadance’s succulent marehood had been sat a small stallionhood and pair of plump, fuzzy balls. If he’d had the faintest idea that she could give herself an endowment so easily, he wouldn’t have needed to rely on surreptitiously coaxing guards or opportunistic townsponies to their bedroom in the first place! Gazing longingly at her package, he reflexively bucked his hips.
“If you like that, you’re gonna love this,” she purred. “For every bit of length I steal from you, I’ll give myself twice as much ~ how’s that sound?”
Images of her plowing him, taking him from behind and utterly dominating him, sailed through his mind. Was she really going to spectate as he got plowed by the stallions he’d invited over? Where was all this coming from? Did she really intend to rob his endowment for herself? A thousand questions and one assailed him, but she wasn’t finished with him - not by a long shot.
Leaning in and kissing his nose, she locked eyes with him. “If your little soldier is smaller than my marecock after - oh, let’s say an hour, I will make this permanent…”
A chill ran up his spine as her statement sank in. Regardless of whether or not she was being completely serious, this was bad - really, really bad. At best, he was going to get dicked-down in front of her while doing everything in his power not to enjoy himself - at worst, he was going to trot away less of a stallion than he already was.
Cadance got to her hooves, magically flipped him onto his back, and turned her attention to the small gathering of visitors lingering by the exit. “He’s all yours, colts. Don’t take it easy on him…”
Laying widthwise across the bed, Shining was helpless as the stallions descended upon him. One of the studs trotted around to his rear, a second moved over and pulled the gag from his snout, and the rest patiently waited their turn. While none of the ponies had planned on putting on a show, they weren’t about to question Cadance’s orders.
After getting into position, the young pegasus smoothly slid his stallionhood into Shining’s muzzle. “Here ya go, bitch.”
“Now that his wife’s here, I bet he’s loving this,” the earth pony chuckled as he plunged into the Prince’s ass.
Shining sputtered around one stallionhood while a second pistoned in and out of his tush. He knew Cadance was somewhere nearby, but the only thing he could see were a pair of fat balls slapping against his face. While he was claimed from both ends and drew in the scent of musk with every breath he took, his dread was gradually eclipsed by lust.
There was something magical about being claimed by a stallion, taken as though he was a fertile mare in heat, and it almost made him forget that the love of his life was seeing him get spit-roasted - almost. Wading through his bliss, but still relishing the taste of pre-cum on his palate and the sensation of his p-spot being battered, he glanced over and saw her. Cadance was only a few feet away, nearly within reach, as she languidly stroked the stallionhood she’d given herself.
His eyelids fluttered when the stud pounding his ass fully hilted him, unprepared for the sensations his ensorceled ass afforded him. Getting screwed felt amazing under ordinary circumstances, irrespective of what position he was being rutted in, yet the enchantment Cadance had placed on him made the experience phenomenal. In spite of his best efforts, pitting his willpower against the bolts of pleasure assailing him, his efforts not to stave off his bliss were found wanting.
It would usually take him quite some time to cum - even then, it usually involved a reach-around or some stimulation to his tool, but that was no longer the case. His stallionhood jerked and throbbed in tune with his thundering heart, flaring as it flopped against his belly. He wasn’t just being pushed to the brink of a climax from anal alone, he was about to cum after what couldn’t have been more than a few minutes.
The stallion above him shuffled forward and gave a mighty thrust that buried every inch of his length down his gullet. His lungs burned and throat spasmed, cut off from air as his eyes began to water. He thought he’d been doing well, fending off his orgasm valiantly, although that changed with the pair of studs fucking him hilted him in tandem.
In a split second, the choker around his neck snapped, his prostate was crushed, and he came. Gouts of spunk surged from his pulsing cock, painting his chest, chin, and shoulders in his essence while stars danced in front of his eyes. It should have been a fantastic experience, achieving release without so much as touching himself, but then it felt it - an odd, unfamiliar warmth surrounding his stallionhood.
Though he couldn’t see it, he could sense a fraction of his length and girth wither away. Cadance hadn’t been messing around, she’d actually shrank his dick after he’d cum, and that meant her own endowment had just gotten a bit larger as a result. Forcing himself to look over at her, he marveled as what had been a cute little colthood grew by a few inches.
“B…buck,” the stallion above him wheezed. “Gonna give you a nice dessert for - Hnnngh.”
The dick swabbing Shining’s throat swelled as wave after wave of foal-batter was pumped directly into his stomach. Either by dumb luck, because he was an exhibitionist, that he’d been particularly pent up, or some combination of the three, the stud plowing his ass crossed the threshold moments later, hilting and flooding his rear with jizz. Even though he’d only just cum himself, the two-pronged influx of seed nearly sent him flying over the edge a second time.
Dismounting and hauling his softening length free with a soft pop, the stallion who’d made use of his muzzle smiled down at him. “Don’t worry, I’ll give you a second round shortly.”
“Same here,” the other stud chimed in as he pulled free of his loosened, cum-leaking tush.
Heaving air into his chest, Shining shudderingly lifted his head and peered down at himself. As he’d suspected, his stallionhood was slightly smaller than it had been minutes prior - still impressive in size, but not as impressive as it once was. Looking past his semi-flaccid length, he spied his engorged, exceedingly sensitive balls and knit his brow.
Normally the size of tennis balls, his nuts were now roughly as big as a pair of softballs. He would have - should have been worried, but the prospect of being used in front of his wife, paired with just how incredible he felt, dulled his thoughts and made it hard to comprehend the predicament he was in. As the ball-gag was slipped back into his mouth, he shivered when not one but two of the stallions who’d been waiting angled their endowments at his pucker.
It didn’t take a rocket scientist to figure out what the duo were planning. Holding one of his fetlocks in their forehooves, the pair pressed their cocks to his ass and forced themselves into him. Shining threw his head back and gave a muffled groan of unfettered bliss while his hole stretched around the two fat, hot stallionhoods filling him.
Sweet, merciful Celestia - he was screwed in every sense of the word. It shouldn’t have been possible for anypony, much less a stallion like himself, to feel this good! His eyes rolled to the back of his head, drool seeping past his lips, and his enfeebled dick leaked a cocktail of jizz and pre-cum over himself while he inched closer and closer to his limit.
The good news was that he didn’t cum a single time from the double-stuffing he was given - the bad news was that he came twice. Each release was even more amazing than the last, drowning him in pure ecstasy, yet they came with a price. Like she’d promised, Cadance’s spell shaved away at his size with every climax he endured.
Peeking down at himself as the pair of studs sawed into his loosened backdoor, he was taken aback by what he’d lost. His once proud stallionhood was a pale shadow of its former self. Nearly half his length was gone, and his balls were close to double their original size, yet nopony seemed to care - if anything, his adorable little colthood seemed to excite both his lovers and his wife.
He shot Cadance a pleading look, but she paid him no mind - instead, she rolled her eyes while she continued to get herself off. Her marecock still wasn’t huge by any means, appearing roughly average in size, but he knew it wouldn’t stay that way for long. With two of the studs still standing idly by, and the initial pair having mentioned going another round, he was certain that things were far from finished.
The duo of fat cocks sawing into his ass were nothing short of breathtaking and drove him to the brink far, far faster than should have been possible. Biting down on the ball in his snout, he did everything he could to distract himself with unsavory thoughts - alas, the sins of the flesh were far too powerful for him to hold out. With his eyes crossing and twitching stallionhood withering, he spurted yet another gout of seed onto his gurgling stomach.
“Hey,” one of the stallions shouted, “I think she’s got room for a third!”
Fighting through his blinding pleasure, Shining made no attempt to flee as a third stud joined the duo fucking him. No way - there was no possible way he could handle having another cock lodged in his tush ~ could he? Be it from the spell Cadance had cast, or the merciless screwing he’d been receiving - possibly both, the duet quickly became a trio.
His refractory period, as short as it was, disappeared entirely when his pucker swallowed up yet another throbbing length of pony meat. Even on his best days, when he was ready and raring to go, it would have taken him several minutes to recuperate after blowing a load - now, weathering the full brunt of a triple-penetration, he rebounded from one climax to another with ease. Over the span of just a few seconds, he suffered through a quartet of orgasms that left him cross-eyed and struggling to breath.
All the while, Cadance remained where she sat and looked on with disapproval. He could practically read her thoughts, hearing how she thought so little of his deplorable performance, but he didn’t care about her disdain. While he’d be the first to confess that he shouldered most of the blame for his deplorable condition, it was her fault that he was literally being fucked over in such a humiliating way.
The trio railing him out in tandem didn’t last terribly long, although it felt like a small lifetime. Heaving air into his chest, he exhaustedly peered down and watched as his belly swelled under the combined might of three heaping helpings of foal-batter. It may have been a mercy that his gut, being one of the only parts of him that had actually grown in any appreciable way, distended to the point of obscuring his groin, because he shuddered to think how small his colthood had become.
“My turn,” a deep, sonorous voice intoned.
He looked to the side and felt his heart sink, only then remembering that there was one stud who hadn’t used him. Taller and more heavily built than his compatriots, the absolute mountain of an earth pony got onto the bed, rolled him to his side, and slid his monstrous endowment between his thighs. Though he had just survived a triple-penetration, the giant stud’s tool was nearly as big as his last three lovers put together.
Grabbing one thigh and spreading his hind legs, he freely gave himself to the titan. Buck it - there was a point where he could have possibly turned back, running away to beg his wife for forgiveness, but he’d passed it some time ago. As the colossus plunged into his ass and began hammering away, he whined and humped back against his gargantuan lover.
“He’s not even trying…” Cadance muttered to herself as her marecock swelled once again.
Shining would like to say that his stallionhood couldn’t get any smaller, but he didn’t dare jinx himself. As things stood, his pitiable length, or lack thereof, was so diminutive that it was practically an innie. Having a prick that was functionally useless would have been bad enough in and of itself, but having it rub against his sheath, adding yet another layer of stimulation to his pleasure-wracked brain, was downright sanity-shattering.
The flow of time warped and distorted as he slipped into a blissful haze. He couldn’t say what all had happened to him, weaving in and out of consciousness, although he was given fleeting glimpses, like pictures in a photo album, of what he went through. One moment, he was riding one stallion while sucking off another - the next, he was on all fours being spit-roasted with two dicks in his ass. The entire experience was bittersweet, profoundly pleasurable yet tinged with the knowledge that he’d only be able to pleasure a mare with his muzzle from that moment forward, but things ultimately took a turn.
“You’re mine now,” a lilting voice cooed in his ear.
He wearily wiped his face, peeked upward, and saw his wife towering over him. She looked - no, she was bigger than she was supposed to be. Taller and far more heavily built than she’d been when she’d arrived, she was a veritable behemoth compared to him. Stepping over and flopping under the headboard of the bed, she surrounded him with her magic and effortlessly lifted him from the mattress.
“You are so pathetic,” she giggled, turning him and inspecting him from every angle. Eventually spinning him to face her, she flashed her teeth and angled his head down to her groin. “For the record, this is your fault…”
“H…holy cow,” he gasped, spying the longest, thickest cock he’d ever laid eyes upon.
Cadance’s endowment was almost the same size as his entire torso, filling him with delirious excitement. After the very thorough warm-up he’d been given, as well as the magical enhancements that had been made to his body, there was no guarantee he’d be able to sheath the insanely huge marecock, but he was desperate to feel it rearranging his insides. Dropped between her outstretched thighs, he dragged himself up to her beach ball-sized nuts.
Piling several pillows behind herself, Cadance reclined and made herself comfortable. “Warm me up.”
He didn’t hesitate, lifting his head and drawing his tongue up the underside of her length. The smell radiating off her nethers was intoxicating, somehow masculine and feminine at the same time, and it spurred him onward like nothing ever had. He may have been covered in a cocktail of sweat and cum, looked positively pregnant from the rapid fire breedings he’d received, and was very, very tired, but none of that stopped him from showering her with his affection.
“Hope you’re having fun, because you’re going to be doing this a lot more often,” she mused, prompting him to glance up at her face. “What ~ you thought I was joking? Shining, I told you that this would be permanent ~ remember?”
How could he have forgotten? The entire time he’d been getting his brains fucked out, he’d dwelled on the concept of permanently losing his stallionhood. While a part of him had and was terrified of never being able to bottom out in a mare again, another, far more intrusive part of him was glad that Cadance had robbed him of his tool. He actually preferred being bottoming to topping, only mounting his wife out of an obligation, and now that’s all he’d be able to do.
“Your whore-ass made me end up like this, having a dick so stupidly huge that I had to make myself bigger to carry it,” she grunted as he licked and kissed every godly inch of her tool. Once he was finished lavishing her length with his lips and tongue, she flipped him around, lifted him up, and turned his back to her. “Get ready…”
He howled in ecstatic glee when she lowered and impaled him on her shaft. As she sorcerously used him like a cheap flesh-light, he squealed with delight and climaxed for the umpteenth time that evening. She was right, this really was all he was good for, although that wasn’t necessarily a bad thing.
Though he didn’t have a mirror handy, he could imagine how absurd he must have looked. His belly was so heavy that he could pass for carrying triplets, what was left of his stallionhood couldn’t even extend beyond the fleshy folds of his sheath, his ass was wrecked beyond repair, and his nuts were bigger than his head. He was no longer a Prince - heck, he couldn’t even consider himself a stallion - now he was just a convenient plaything for his lover’s mammoth marecock.
As she shamelessly used him, gradually picking up speed while she sought to sate her carnal urges, he considered what the future may hold for him. Maybe Cadance would change him back someday, returning him to his original form, or perhaps she’d make good on her promise and keep him like this forever - regardless, in that moment, he only had one true desire. Repeating it like a mantra, unable to speak through the rubber ball stuck in his mouth, he mutely prayed to the heavens for one thing.
‘God I hope Cadance never stops fucking my useless ass…’