Big Mac squirmed as he sat on his bed, waiting for Rainbow Dash to finally make her way upstairs. It was almost awkward seeing her after their last date, which had ended with what could be best described as a revelation.
Dash had been showering after a rather heated round of sex, and had left her clothes scattered around the room. Big Mac, being the responsible stallion that he is, decided to fold them up for her. It was all going without incident until he came to pick up her panties. They were lacey, frilly things. White in color, with a large red heart placed just below the wearer's tail. They were much too small for him, but Big Mac nonetheless had felt the urge to try them on.
How could he have known that Dash would shower quicker than normal that morning? Really, it wasn't his fault that she had left a particularly racy pair of panties next to his bed, especially since she knew he had strong sub streak in him.
He had been unable to hold his curiosity back, and after checking to make sure the door was locked, he put them on. It wasn't easy, as he was nearly twice the size of Rainbow, and even that was generous. Nonetheless, after a not insignificant amount of effort, he managed to slip them up his legs. For a minute or so, he merely looked at himself in the mirror, unable to deny how good he looked. The fabric clung to his every curve, highlighting his muscular frame. Not to mention how sexy the massive bulge his cock created in the fabric was.
But, an odd thing happened next: An odd feeling of comfort. He couldn't place the feeling, he couldn't describe it, all he knew, was that he enjoyed it. A smile had spread across his face as he began to pose in the mirror, taking in every inch of his body he could. Bending over, stretching, flexing, all the while his cock kept half-hard by the sheer feeling of sexiness coursing through him.
Then, Rainbow had walked out of the shower just as he was admiring a particularly good view of his bulge.
Instead of being mad, however, Dash had been almost as excited about seeing him in panties as he was about wearing them. After a quick discussion, Dash had taken the panties back from him as she left, with a promise that the next time they met up she would have a special surprise for him.
So, here Big Mac was now, waiting to find out what his marefriend had planned for him.
Big Mac's ears flicked as the door to his bedroom opened up. He turned his head, giving Dash a nervous smile as she stepped into the room.
"How ya doin’?" She asked, a teasing smile on her face.
"G-good," Big Mac replied, trying to work out the jitters in his voice.
"Great!" Dash said, her grin widening as she took a few steps closer to him. She pulled an unremarkable black duffel out from behind her, tossing it to the floor with a loud thunk.
"What's in the bag, Dashie?" Big Mac asked, his eyes dancing between her and the bag.
Rainbow chuckled, cocking a hip out to the side as she gave him her signature smirk. "What's in the bag, you ask? Only stuff that’s gonna make tonight the best sex we ever had!"
Before Big Mac could ask what she was talking about, Rainbow bent over, reaching into the bag and pulling out a strip of white fabric.
"Catch," she said as she tossed it to him.
Without thinking, Big Mac reached out and caught it, his massive hand all but engulfing the thing. His brow furrowed as he used both hands to unravel it, only for his mouth to drop open as he realized what it was.
The very panties she had caught him wearing a few days before were once again in his grasp, the bright red heart all but staring him in the face.
"Why don't you put them on, stud?" Rainbow said. "Twilight owed me a few favors, so I got her to put a nice little enchantment on them. Trust me, it's something we'll both enjoy."
Big Mac gave Dash a questioning look, but nonetheless stood up. "If you say so," he said as he bent over to slip the panties past his feet. He didn't feel any different as he pulled them up his long, muscular legs. A few moments later, he pulled them over his ass and balls, not even bothering to make an attempt to fit his massive cock into the lacey underwear.
Blushing slightly, Big Mac crossed his arms and turned back to Dash. "Well? What's the surprise?"
Dash looked back at him with a smirk. "Have fun, Stud," she said before lifting a hand and snapping sharply.
Immediately, Big Mac felt the panties warm against him, the tingle of magic soon creeping into his body. The tendrils of warmth and magic wormed their way through his body, spreading and thickening until they filled him completely. Big Mac squirmed on his feet, the sensation wasn't uncomfortable, but he couldn't ignore the accompanying feeling of arousal that was welling up inside him.
Big Mac swooned slightly, having to spread his legs in order to keep his balance, his head spinning. He looked back at Dash, and to his surprise she seemed to be… growing? It took him a few moments to realize that Dash was now a few inches taller. Confusedly, he looked down at the ground and it finally clicked: she wasn't growing, he was shrinking! And not only that, he could feel the panties growing tighter around his waist and ass, the lacey fabric groaning slightly.
The panties pulsed, sending another torrent of magic through him, making the heat filling Big Mac almost unpleasant.
Powerful sensations were exploding throughout his body, his head growing woozy as he tried to figure out was happening. He reached down to adjust the panties in an effort to relieve their tightness, only for his hands to reach flesh much sooner than he expected. Big Mac looked down to see that his hips had ballooned outwards, turning from normal into a set that wouldn't look out of place on a supermodel. They flared outwards from his skinny waist, giving one a perfect handhold if they were looking for one.
His hands were slimmer as well; his fingers shortening and thinning until they could easily be described as feminine. His forearms had suffered the same fate, losing their well earned muscle as they slimmed down into a perfectly sculpted example of feminine grace.
Moaning slightly, Big Mac stumbled forward as his center of gravity suddenly shifted. Looking over his shoulder, Big Mac's eyes opened wide in shock as he realized he sported an ass that would put any mare in Ponyville's to shame. He moved his hands backwards, planting them on his still expanding flesh, not knowing what else to do. Sure enough, his muscled, tight cheeks were gone, replaced with a downright lewd set that all but swallowed his hands. They were soft, and squeezable, and soon enough Big Mac found himself doing exactly that. He massaged his plump ass as it finally stopped growing. Each cheek bigger than his head, and jiggled for days with every slight movement he made.
"D-Dash," Big Mac groaned out, his voice spiking upwards in pitch towards the end. A loud, feminine moan escaped his lips as the warmth pressed against his skin, smoothing and rounding out his curves so that they flowed seamlessly into each other. He shakily reached up a hand to his face, exploring its new puffy, whorish lips and feminine structure.
With the warmth finally dying, Big Mac turned to the side, the thought of looking in a mirror finally appearing in his overwhelmed mind. Immediately, the "stallion" in the mirror's mouth dropped open.
Gone were Big Mac’s powerful muscles and his impressive height. The stallion in the mirror was barely over five feet tall, with hardly any muscle definition to speak of. His mane and tail were longer, and shone with a glossiness that could only come from more than a few trips to the spa. He must have weighed the same however, as there was no other way to explain the absolutely obscene hips, massive ass, and meaty thighs he sported. By Celestia! All of his weight was in his lower body! He could barely be called a "he" really, his entire body having a decidedly female aspect to it.
Except for one part, that is.
Big Mac still supported his two foot shaft, the appendage appearing even more obscene on his smaller body as it hung out over the lip of his panties. His balls stood out equally as much, the cantaloupe sized orbs resting happily against the front of his plump thighs. The panties themselves barely covered anything, and now appeared to be more a thong than anything else. Big Mac squirmed as he became aware of the tight fabric buried in his asscrack, rubbing sensually against his puckered asshole.
A loud wolf whistle sounded through the room, and Big Mac turned to see Rainbow shamelessly ogling his new body. "Lookin’ good, Mac," Rainbow purred, her eyes checking out the massive bulge his balls made in the panties. "What do you think?"
Big Mac took another look at himself in the mirror, and slowly, a smile spread across his effeminate face. He fondled his massive rear, marveling at the way his hands all but disappeared.into the plush cheeks. He looked good.
"Twilight sure outdid herself," he said, his voice barely distinguishable as a stallion's.
"Definitely," Rainbow replied,"but that’s not the only thing I got from her." Smirking, she reached down into her duffel.
Big Mac opened his eyes wide in surprise as Dash pulled a sizeable strap-on out of the bag. She had used it on him a few times before, when they first started experimenting in their relationship. His cock twitched as memories rose up in his head, a small strand of drool trailing from his mouth.
"She also put something on this for me," Dash continued as she started pulling the strap-on up her legs. "I'm not gonna lie, I'm looking forward to seeing what this feels like." Before Big Mac could reply, Dash finished pulling the faux-cock up, placing her hands on her hips as she gave him her signature smirk.
Then, the muscles around Dash's crotch began to bulge, her skin twisting and coiling as the flesh underneath began to grow. The bulges worked their way down her legs first, her thighs, calves, and the rest of the muscles clenching as the wave finally hit her feet. And then, Rainbow began to grow.
Big Mac's mouth dropped open in shock as Rainbow's height increased by an inch, two inches, four. It was slow at first, but soon the mare was rocketing upwards. Soon, Big Mac had to crane his neck backwards to keep up with her growth. Rainbow herself was groaning, but her stance didn't change in the least. After a few moments, Rainbow stopped growing, and Big Mac found himself staring in awe at her new stature. She was easily more than a foot taller than he was at his normal height, and she now stood at an awe-inspiring seven and a half feet, at least.
Her hips swelled outwards, but not nearly to the degree than Big Mac's had. They had to, in order to properly anchor the mare's now-massive, muscular thighs. Her breasts swelled, easily doubling, then tripling their size until they were at least twice the size of Big Mac's head. Despite their size, they didn't droop at all. The twin, perky orbs defied gravity as they stood proudly on Rainbow's chest, and Big Mac couldn't help imagine being buried in their cleavage.
Dash always had an impressive physique, her powerful muscles easily visible against her coat if she flexed them, but whatever enchantments Twilight had put on the strapon were not satisfied with "impressive". The mare's muscles bulged against her coat, each and every inch of her body hardening into a positively divine display of fitness. But yet, they weren't so big as to be too big, stopping just as they threatened to overwhelm the rest of the mare.
Big Mac felt his heart thundering in his chest as the strapon itself started to grow. Lengthening and thickening until the flare hung between Rainbow's knees, and still continued to droop lower. Slowly, a bulge appeared beneath it, the un-shapen lump soon convalescing into a set of balls that put Mac's own to shame. The orbs soon swelled bigger than apples, grapefruits, cantaloupes, finally slowing down as they were roughly the size of watermelons.
The straps holding the fake cock to Rainbow's crotch faded into the mare's skin, quickly disappearing altogether. A wave of what could best be described as life, blossomed through the cock and balls. Veins bulged along the shaft's mighty surface, leaving no doubt in Big Mac's mind that, at least for now, it was just as real as his own was.
"Awww yeah!" Rainbow exclaimed, her eyes roaming over her new body.
Big Mac couldn't tear his eyes away from his marefriend as she struck a mighty pose, her muscles bulging underneath her coat. Rainbow kept flexing, slowly moving from pose to pose, an ecstatic grin splitting her features as she checked herself out. Her cock swung heavily between her legs, reaching slightly below her knees in its softened state.
The mare spun around so she could look at her reflection in the mirror, her eyes glinting as she continued to show off her near-divine body. Of course, this had the effect of exposing her mighty ass to Big Mac's hungry gaze, the poor stallion all but overwhelmed already. Like her tits, her ass cheeks defied gravity. There was simply no logical way that they could be as big as they are but still have the tightness that came from a lifetime of sculpting one's body. Then, Rainbow struck another pose, and her ass cheeks visibly tightened as she flexed them.
Big Mac's mouth dropped open as his eyes explored every curve and rippling muscle on Rainbow's body. She was so… so big, and strong, and powerful. A storm of emotions was running through his head as he finally realized that the inherent dominance that came from his normal size had been upstaged in a genius display of Twilight's magical prowess. A blush slowly crept across his face as he remembered the current state of his body, the amazon and her femboy colt friend. His cock grew, and grew, and grew as Rainbow continued to pose, until the full two foot length was jutting out proudly in front of him.
Dash suddenly froze, turning around and locking a predatory gaze on him.
Big Mac gulped as Rainbow slowly turned around, her cock swaying pendulously back and forth from the motion. She took a step forward, her hoof impacting the floorboards with a resounding boom. And then another, and another, her heavy balls swinging along with her shaft. Big Mac's nostrils flared as a heavy cloud of musk settled over him as Dash approached. It was so much thicker and heavier than his own, overwhelming his own scent with barely any effort.
Dash came to a crashing halt a few feet in front of him, the heat from her cock easily resonating against his own hardened rod. "Well, I was gonna ask what you thought, but this..." she reached down and wrapped a hand around his shaft. Before, her hands didn't even manage to reach half way around his impressive length, but now she accomplished the task easily.
"...Answers it for me."
Big Mac looked up in awe, his head swimming as he tried to make sense of this situation. He was called Big Mac for a reason. Everywhere he went, he dwarfed other stallions in both height and musculature, and on some level, he always enjoyed that. Without it, he doubted he ever would have had the confidence to court a mare like Rainbow, who was larger than life in everything she did.
But now… Rainbow was larger than life in a very real sense. He was small, cute, feminine, exposed, vulnerable, barely more than a toy compared to the new Rainbow. He wouldn't deny she had always been the dominant one in their relationship, but this was something entirely different. Normally, the thought of being so vulnerable would be terrifying, but with this, massive, amazonian Rainbow, he knew he would be safe.
Smirking, Rainbow started to stroke his shaft, dragging Big Mac out of his introspective thoughts. He only groan as Dash jerked him off handling him easier than one would a toy. His cock twitched, spraying a musky rope of pre onto Rainbow's own cock. He screwed his eyes shut as pleasure coursed through him, his fat ass jiggling as he shuddered. A feminine moan slipped from his mouth, ringing clear and true through the bedroom. Suddenly, Dash moved her hand from his cock to his chest, and with a flick of her wrist he was sent flying through the air. After a brief moment of flight, Big Mac landed with a grunt on his bed, bouncing a few times before he came to a rest.
Big Mac's head swam for a few moments as he came back to himself, and as soon as he did his eyes opened wide in surprise. Rainbow's massive ass was poised above him, the mare herself sporting a smirk on her face as she looked down at him. "Why don't you give me a little attention, and then I'll give you something in return." Before Big Mac could reply, Rainbow Dash thrust her ass downwards, completely enveloping his head between her tight ass cheeks.
Immediately, Rainbow's musk assaulted his senses, the thick, heady cloud filling the air around the mare's nethers. Big Mac groaned, planting his hands on Rainbow's ass as he tried to lift the mare up to get a breath of fresh air. But her weight was too heavy for his slim arms, and all he succeeded in doing was giving Rainbow's rear a fondle. Her balls squished against his chest, the twin orbs almost twice the size of his head. They radiated a powerful heat that rapidly filled his entire body. They pulsed and throbbed, Rainbow's heartbeat thumping through them with every pump.
"Come on, Mac," Rainbow said, her voice barely reaching him through the expanse of her ass. She wriggled on top of him, burying his face even deeper in between her ass cheeks. A few seconds later, Big Mac felt the crinkled star of her anus pressing against his muzzle. "You know what to do."
Without any hesitation, Big Mac extended his tongue and pressed it against Rainbow's asshole, the lithe muscle surprisingly large for his small size. His struggles for fresh air had ceased, and he happily breathed in Rainbow's powerful musk with every breath. His hands sunk several inches into Rainbow's rear before stopping against a wall of tight muscle. He pulled himself upwards, pressing his muzzle harder against her rear entrance.
Big Mac lavished Rainbow's anus with attention, swiftly covering it with his saliva. He licked and teased it, using every iota of skill he had picked up during previous sessions with his marefriend to please her as best he could. He planted his hands on her cutiemark, shamelessly groping and kneading the muscular flesh.
"That’s a good colt," Rainbow purred on top of him, pleasure dripping from her voice. She shuffled on top of him, burying his head so far in her crack that her ass cheeks were able to touch the bed. The mare was happily kneading her own tits, roughly tugging on her protruding nipples as little moans slipped out of her open mouth. Her titanic cock was slowly swelling as blood was pumped into it, growing longer and thicker with each passing moment.
Big Mac kept licking Rainbow's crinkled star, tugging at the muscular ring as he saturated it with his saliva. His eyes opened wide as Rainbow's anus suddenly spread, allowing to the tip of his tongue to slip into her tight passage. Immediately, the mare sitting on him let out an encouraging sound, a shudder coursing through the cushions of ass flesh surrounding his head. Big Mac didn't hesitate, he quickly dug his fingers into Rainbow's tight rear as he thrust his tongue as deep as he could into her clenching ass.
Rainbow's cries peaked above him as Big Mac eagerly tongue-fucked her tunnel. It was no small amount of effort to fight against Rainbow's spasming insides, who seemed to want nothing else than to hold his tongue still. But Big Mac was nothing if not determined, and through sheer force of will he managed to drag his tongue relentlessly back and forth. He wriggled, writhed, and lashed his tongue against Rainbow's insides. After a minute or so, Big Mac realized that Rainbow's weakspots had apparently increased in size with the rest of her, something that he took full advantage off. Big Mac shifted, somehow managing to press himself even harder against Rainbow in preparation for a long, long feast.
"Holy fuck! I can't wait any longer!" Rainbow shouted, and to Big Mac's surprise the mare suddenly lifted off of him.
Big Mac didn't know what to do as Rainbow shuffled backwards, barely able to form a complex thought as her musky balls dragged over his muzzle. He took a few deep breaths to ease the light burning in his chest, somewhat surprised that it wasn't nearly as bad as it ought to be.
"Twilight put a few safety nets on for both of us," Rainbow answered from above him. "She was worried that we would get carried away."
Big Mac bent his head backwards to respond, but froze when he realized the almost angry flare of Rainbow's dick was barely three inches away from his face. It was massive, nearly the size of his face, if not bigger. A stream, no, a river of pre flowed from her cockslit, the thick fluid forming a puddle on the bed sheets that already was starting to soak into his mane.
"Open wide," Rainbow said, pressing her shaft against Big Mac's puffy lips.
Big Mac didn't respond, too preoccupied with the thought of dealing with a dick that he could eat dinner off of was seeking entrance into his mouth.
"You gotta trust me here, Mac. Twilight said you'd be safe, she wouldn't have given me those panties back if they weren't perfectly safe. You're my coltfriend, I wouldn't do anything that would really hurt you."
Despite the near overwhelming amount of musk and pre assaulting him, Big Mac couldn't help but feel comforted by Rainbow's voice. She was using the tone that was reserved for him alone, a rare peek into the mare's sensitive side that he always treasured.
"I trust ya, Dash," Big Mac said, laying a hand on her own. He gave her smile, barely able to see her face past her cock. "Now cmon', show me what a big mare like you can do. Fuck my throat, use me."
Rainbow chuckled, giving his hand a squeeze. "You big lug. You still have to work on your dirty talk."
"Well, I'm happy to have you helpin' me," he replied, readying himself for the coming storm. He reached a shaky hand down to the stretched panties, a comforting warmth travelling up his arm in response. Big Mac took a deep breath, quickly dredging up every shred of courage he could from his plush body. Letting it out, he relaxed into the bed, opening his mouth as wide as he could, hoping that Dash had as much faith in Twilight's magic as he did in Dash. A moment later, Dash pressed her cockslit directly against his mouth, the river of pre flowing into his mouth without any obstacles.
Big Mac almost choked as his mouth was suddenly filled to the brim, his cheeks bulging outwards as he struggled to hold it all. More than a few mouthfuls of thick pre spilled across his face, pooling in his eye sockets before Big Mac had the presence of mind to swallow. He gulped loudly, and he could feel the bulge in his throat as the pre made its way into his stomach.
It left behind a thick coat of lubrication in its wake, every inch of his mouth and throat literally painted with the stuff. Big Mac's eyes defocused as a steady warmth emanated from the pre, seeping deep into his muscles. The tension gradually eased out of his throat, the feeling of warmth renewing as Big Mac swallowed another mouthful of Rainbow's pre. A dopey smile split Big Mac's lips as he gently suckled at Rainbow's urethra, tendrils of warmth and magic spreading through him with every gulp.
"That’s a good colt. The magic is in my pre, it'll make sure you enjoy this as much as I am," Rainbow cooed, shuffling on her knees as Big Mac's puffy lips teased her sensitive head. "Alright, here we go," Rainbow said after another dozen mouthfuls.
Big Mac groaned as he felt the pressure against his mouth increase, his face straining as he tried to stretch his lips even wider. And then, suddenly, it was in. Rainbow's gigantic flare was pulsing angrily in his mouth, the rest of her length against his lips. His eyes rolled back in his head as he let out a throaty groan, the sound all but muffled by Rainbow's cock. What parts of his mind that weren't overwhelmed by musk and sensation were screaming at the impossibility of what was happening, but the rest simply didn't care.
"Oh, wow," Rainbow groaned, the words barely audible against the backdrop of her moans.
Big Mac moaned right along with her as another inch of cock slipped into his mouth, the mare's throbbing veins easily identifiable against his overly stretched lips. His pre-slicked mouth was more than up to the challenge though, and another few inches of Rainbow's shaft were eagerly swallowed down. In only a few seconds, more than a foot of thick cockmeat was stuffed into his mouth, the flare nudging against the entrance to his throat.
The massive shaft brushed aside what resistance Big Mac managed to put up with nary any effort. The massive flare bore its way inexorably forward. Inch, after inch, after inch of throbbing dick slowly forced its way down his throat. Big Mac gurgled, small streams of saliva and pre managing to slip out from his mouth to run down his face. His eyes rolled back in his head as more than two feet of cock was buried in his throat, and it seemed that Rainbow wouldn't be satisfied until the rest of her shaft was too.
"Oh Celestia, Mac! Your throat… ngh, it's so tight!" Rainbow exclaimed, planting her hands on the bed in order to get a better angle.
Big Mac's eyes opened in surprise as Rainbow suddenly thrust the last foot and a half of her shaft into him. His mind shut down as he tried to process the sensation of a cock as big as Rainbow's. He had no idea how he had enough room to fit her, but he didn't find himself caring as he length pulsed in him. Rainbow's heartbeat thudded through his body, each beat pumping another load of pre into his gut.
Big Mac went limp as Rainbow held herself still, the mare simply savoring the exquisite tightness of his throat rippling around her length. Big Mac writhed and squirmed on the bed, overcome by the sheer feeling of fullness. He lifted his hands, running them over the massive bulge in his throat. His face was completely enveloped by Rainbow’s gigantic, over productive balls. He could feel the ocean of cum pooling in them, growing larger and larger with each passing moment. Her musk was everywhere, invading his senses like a conquering army. The thick, near-palpable scent seeped into his coat, making sure he would smell of her long after the night was done.
With a loud moan, Rainbow pulled her hips back, slowly dragging her shaft out of Big Mac's throat. It was no small feat as Big Mac's insides were wrapped around her like a vice, rippling around her length as they unconsciously tried to milk her for her seed. Eventually, after what seemed like an eternity, only the flare was still lodged in his throat.
She quickly widened her stance, and Big Mac braced himself for the coming storm. Rainbow's powerful muscles coiled and bulged against her coat as she buried her shaft in Big Mac with one, unstoppable motion. She didn't pause this time, pulling herself back and thrusting forward in a fast, brutal rhythm.
Big Mac couldn't do anything but take the brutal facefucking as best he could. He relaxed his body as much as possible, letting his marefriend use him for her pleasure as one would a toy. His own cock throbbed, firing a few strings of pre upwards to rain down on his lower-body in a rain of sex. Rainbow's balls smacked against his face again, and again, and again, making sure every breath he took was full of nothing but her scent.
Thwap
Thwap
Thwap
Rainbow's hips were moving so fast they were little more than a blur, dragging her three and a half foot shaft in and out and in and out of Big Mac's tight throat. It was a ceaseless rhythm, which could only end in one way. Spit and pre were spilling out in rivers from Big Mac's mouth. The sheets below him were already soaked in sex, and would likely never get clean again.
"Mmm," Rainbow moaned as she kept up her awe-inspiring rhythm. "You're such a good little cocksucker, aren't you?"
Big Mac moaned in response, thick streams of drool and pre running down his face. The sticky fluids soaking into his fur.
"Does my cock taste good?" Rainbow continued, already knowing the answer. "I hope you like it, Mac, because you're going to be doing this often from now on."
Chuckling, Rainbow hilted herself in Mac's throat and held herself there, making sure to rub her musky balls all over the stallion's face. She savored the sensations Mac's spasming throat were giving her for several moments before pulling her hips backwards. A second later her massive flare audibly popped out of the stallion's mouth. ."Come on, don't be shy, Mac. Do you like the taste of my cock? Do you like me fucking your throat? Using you like my personal cocksleeve?" She said as she rubbed the stallion's face with her flare, giving him a fresh coat of her pre.
Big Mac panted heavily as he recovered from the assault on his throat, but couldn't stop himself from nuzzling and kissing the flare pressed against his face.
"I want an answer, Mac," Rainbow said again.
The femmy stallion groaned, wrapping an arm around Rainbow's massive fuckpole and bringing it closer to him. "P-please R-Rainbow," Big Mac forced out, his tongue not cooperating with him. Whether from fatigue, or just an overwhelming desire to keep it plastered against Rainbow's cock, Big Mac didn't now. "It's amazing. Use me."
Rainbow smiled, shifting on her hooves to reposition her flare at the stallion's lips. "Then open wide."
Big mac did so, and only a second later Rainbow thrust her cock back down his throat, quickly building back up to her earlier rhythm. He had no idea how long Rainbow used him like this. His entire world became the near-mind breaking sensations Rainbow's cock gave him. Her taste, her smell, her thudding heartbeat, his mind latched onto these and didn't seem to want to ever let go. Big Mac's tongue lashed across what parts of Rainbow's shaft it could, making sure to give Rainbow every iota of pleasure possible.
After what seemed like an eternity, Rainbow's pace suddenly faltered, a particularly heavy blast of pre blasting directly into Big Mac's gut. A throaty groan sounded from Rainbow's mouth as she held herself hilted against Big Mac's face. Her balls throbbed against him once, twice, three times. And then, her cock erupted.
Big Mac screamed as Rainbow's cum blasted into his gut. Her orgasm didn't come in ropes, forgoing that completely in favor of a constant, fire hose of seed. A thick, wet gurgle sounded from Big Mac's throat as gallon after gallon of baby batter were pumped into him. His belly rapidly began to bloat outwards, forced to by the sheer amount of seed.
"Oh fuck Mac!" Rainbow exclaimed through her moans. "Drink it all up!"
And Big Mac did, tightening his throat and lips as tight as he could, not allowing a single drop of Rainbow's precious cum to escape. Rainbow gave a few short, jerky thrusts as her balls continued to unload, gasping and grunting with each throb of her cock. Suddenly, Rainbow pulled back in a single, long motion, her flare slipping out of Big Mac's mouth with an audible pop.
Big Mac's eyes focussed just in time to get a view of Rainbow's pulsing flare, her urethra stretching open wide as the barrage of cum continued. The wave of seed impacted his face with almost enough force to sting, the thick fluid completely coating Big Mac's upper body in only a second. Big Mac opened his mouth, the flow of cum filling it instantly. If her pre tasted powerful, her cum was liquid ambrosia. Salty, heady, and delicious, Big Mac gulped it down without hesitation, adding to the ocean already contained by his swollen gut. Big Mac swallowed mouthful, after mouthful as Rainbow's orgasm slowly died down. The flow of cum easing from a river, to a stream, to a brook, until finally Rainbow's cock spurted out a few final ropes of cum onto the layer already coating him.
Neither of them moved for several long moments, their heavy breathing the only sound other than a steady dripping of Rainbow's cum onto the floor. Big Mac gurgled around the cum still in his mouth as a thick stream of drool coursed down his face. He weakly lifted his arm upwards despite Rainbow's thick spunk doing its best to hold him firmly to the bed.
Chuckling, Rainbow reached forward and grabbed ahold of Mac's seed-soaked hand. "How you holding up?" She asked, her voice slightly raspy.
"G-good," Mac managed to say, a tired smile creeping across his face.
Rainbow returned the grin, her cerise eyes sparkling with happiness. "Glad to hear that, but I hope you don't think we're done."
Big Mac furrowed his eyebrows, barely able to see Rainbow due to the cum splattered across his face. More? He let out a shuddering breath, already his body was tired. The heavy warmth of the spunk in his belly was lulling him into a hazy fog, only compounding upon the potency of the scent of sex in the room.
"Really?" Rainbow continued, her characteristic snark evident in her voice, "You thought this night would end without my massive cock hilted in your cute ass? Not a chance!" The mare shuffled around, bringing her still, somehow, rock-hard shaft into Big Mac's line of sight. "This still has another few loads to give you, I hope you don't plan on wussing out."
Big Mac stared in half awe and half desire, fighting back to urge to lift himself upwards to bring himself closer to Rainbow's gigantic rod. His ass unwittingly clenched, the thick, plump cheeks tightening against the bed in a clear expression of desire. His mouth dropped open as a drop of Rainbow's cum drooled out her cockslit, splatteing wetly against his face. His own shaft was throbbing against his bloated belly, spilling a steady stream of pre onto his gut. A cute, little moan slipped out of his open mouth as Big Mac realized he wanted this just as much as Rainbow did. He wanted her titanic, divine shaft buried to the hilt in his tight ass. To feel her overfull balls throbbing against his thighs as she prepared to pump his depths full of her cum, claiming every inch of him as her own.
Rainbow chuckled again, knowing exactly what was going through her coltfriend's mind. She gave his hand a final, reassuring squeeze, before letting it go. She took a step back, wrapping her hand around her shaft and slowly beginning to stroke it. "You want this cock?" She asked as Big Mac's eyes locked onto her tool. She smirked, loving the feeling of putting on a show. "Show me how much you want it, Mac."
For a few moments Big Mac could do nothing but stare, too enraptured by the sight of Rainbow jerking herself off. But after a few moments, Mac shook his head, clearing enough of the fog away to spur himself into action.
Groaning as he did so, Big Mac rolled himself over onto his stomach, exposing his still mostly clean back. He got onto his knees, his thin, feminine arms shaking with the effort to keep himself steady. His bloated belly swung pendulously below him, heavy with Rainbow's spunk. Slowly, he spun around so his ass was facing Rainbow, the heat of her powerful gaze seemingly boring straight into his soul. With no hesitation, he lowered his front half back onto the bed, resting directly in the puddle of Rainbow's cum. He flicked his tail over his back, making sure it wouldn't get in the way for what was about to happen.
Moaning, Big Mac reached behind him and grabbed ahold of two handfuls of thick, squeezable booty flesh. His fingers sunk several inches into his fat ass, and he let out a cute mew as his sensitive cheeks were stimulated. He spread his ass wide, exposing his tight, puckered asshole to Rainbow.
"Please, Rainbow," he said, his high-pitched voice ringing through the room. "Fuck your coltfriend's ass."
And then he waited, his heart thundering in his ears.
He didn't have to wait for long, as only a few moments later two massive, powerful hands planted themselves on his rear, easily dwarfing his own. Rainbow possessively groped him, her muscular fingers sinking deep into his ass-flesh as Big Mac was helpless to do anything but stop her.
"That's a good colt," Rainbow replied, sandwiching her cock in the crack of Mac's fat ass. She fondled his cheeks as she pressed them tighter together, squishing them against her rock-hard shaft. They barely reached halfway around her turgid rod, but given the size of it, what Mac's ass did accomplish was nothing short of spectacular. Big Mac groaned as she started to rock her hips back and forth, dragging her cock back and forth in the channel formed by his ass cheeks. Her efforts were easily lubed by the mess of pre and spit coating her shaft. She ground her flare against his puckered star with every pass, wringing a needy groan from the stallion with each pass.
"Do you Mac? Do you really want my cock?" Rainbow asked, punctuating her sentence by pressing her flare against Big Mac's sphincter. Her hands kneaded the supple flesh of his ass, making sure the stallion knew just who was in charge right now.
"Yes!" Big Mac cried out in response, his own cock throbbing mightily beneath him as Rainbow continued her teasing. The poor stallion had never felt like this before. The pure, unrelenting desire coursing through him was overpowering.
"Really?" Rainbow continued, still sliding her cock back and forth. "Cause if you get cold hooves halfway through, I don't know if I can stop myself from finishing. I've been thinking about pumping you cute ass full of my cum ever since I talked to Twilight about this in the first place."
Big Mac groaned, the memory of Rainbow flooding his stomach with her cum, as well as the very real reminder of his still swollen stomach, going straight to his twitching cock. "Fuck me!" He suddenly cried out, surprising both himself and Rainbow with teh intensity of it. But, now that the words were coming, Mac couldn't stop them. "I swear to Celestia Rainbow, if you don't stuff that cock inside of me and fuck me till I'm raw, I won't give you any cider for a year."
Rainbow blinked a few times, her eyes open in surprise at Mac's sudden outburst. Slowly, a predatory grin spread across her face. "Well, when you say it like that…" Smirking, Rainbow pulled her hips back and pressed hare flare against Mac's puckered star, adjusting her grip to hold the stallion as still as possible for her entry.
Big Mac held his breath as the pressure on his backdoor slowly increased, knowing that with the amount of power that Rainbow's body contained, there was only one outcome that could happen. He grunted as his asshole started to stretch, a thick stream of pre coursing into his ass from Rainbow's cockslit. And then, finally, Big Mac felt the familiar magical warmth of Twilight's enchantments spread through him, relaxing every one of his taught muscles.
Big Mac's arms fell limply to the bed beside him, his cock the only part of his body remaining rigid as Rainbow's powerful hands held him steady. He craned his neck upwards as a strangled moan escaped from him, unable to keep himself silent as his asshole stretched, and stretched, and stretched. His eyes rolled back in his head as Rainbow's gigantic flare finally slipped into his ass, the thick, muscular ring of his ass stretched thin around Rainbow's shaft.
The stallion hissed as his passage slowly gave way to Rainbow's cock. It stretched him in ways he never thought possible. Every vein was a distinct presence against his inner walls. Slowly, inch by unstoppable inch, Rainbow fed more of her cock into him. Big Mac only managed to squirm and squeal as more and more dick was stuffed inside him. Each moment it felt like he was going to burst, but instead of feeling pain, he only felt pleasure.
Big Mac moaned as his cock let out a thick spurt of pre onto the bed as the stallion squealed, his ass clamping down around Rainbow's shaft. How? How could it feel this good!? Slowly, Big Mac started to hump back against Rainbow, his limp body rousing into action to spur Rainbow faster. A few moments later, Rainbow's medial pressed against his sphincter, the thick protrusion signifying the halfway point.
With a burst of warmth from the panties, Big Mac felt his ass relax even more, allowing the fleshy ring passage into his clenching ass. A wordless cry exploded out of his mouth as pure, unadulterated ecstasy coursed through him. It was incredible, he was totally unprepared for the sheer amount of pleasure Rainbow's cock was giving him.Through his cum soaked eyelashes, Big Mac's eyes opened wide as his stomach started to bulge even more. Rainbow's throbbing flare was easily visible against his skin, the powerful thump-thump of her beating heart reverberating through his entire body.
"Oh fuck, Mac," Rainbow grunted above him as she fed another half foot of thick cockmeat into his clenching rear, the mare unable to keep herself quiet. The mare's hands held his ass in a death grip, her fingers all but swallowed up by his cushy rear.
"R-Rainbow," Big Mac replied amidst his gasps. "More! Give me more!" Big Mac almost mindlessly humped back against Rainbow, his tongue lolling out of his mouth as he tried to force more of Rainbow's cock into him. It was a token effort at best, as he had nowhere near enough strength to overcome the sheer tightness of his ass, but he couldn't stop himself. Slowly but surely, Rainbow stuffed the second half of her cock into him. And after what seemed like an eternity, Rainbow's muscular crotch pressed against him. Big Mac looked in awe at his distended stomach. The three foot of cock buried in him stretched him farther than he thought possible. The soft curve of the cum in his belly softened the edges slightly, but there was no denying the clear outline on his stomach.
Big Mac would have been happy to simply stay still and savor the storm of sensations coursing through him, but Rainbow was nothing if not a mare of action. Big Mac all but screamed as Rainbow dragged her cock out of him. Whether in ecstasy, or despair at the sheer feeling of emptiness, he didn't know. Rainbow didn't pause as her flare teased at Mac's sphincter, bulging the fleshy ring outwards as it threatened to pop out. She thrust forward, stuffing the entirety of her three foot shaft in Mac's rear without pausing.
Big Mac screamed his pleasure to the heavens, clamping down on Rainbow's cock as he was rocked forward. Rainbow's crotch slapped against his ass hard enough to sting, ripples travelling through his cushy rear from the brutal impact.
"Thats a good colt!" Rainbow shouted as she grabbed fresh handfuls of his ass cheeks, tightening her grip as she started to pound away at him. "Look at you! Taking my cock so well! Should have done this ages ago!"
Moans spilled from Big Mac's mouth as Rainbow fucked him, his eyes rolling back into his head as he lost himself in the ecstasy of it. His tongue lolled out of his mouth, resting in the puddle of Rainbow's previous orgasm. "Har-Harder!" Big Mac cried out, humping back against Rainbow.
Big Mac groaned as Rainbow grunted her assent, her hands digging deeper into his plush flesh. Her hot breath was washing over him, the clear definition of her powerful muscles obvious as they bulged against him. Big Mac craned his neck upwards as a long keening wail escaped his cum-soaked throat. It was too much for him. The constant feeling of stretched beyond belief and crushing emptiness was scrambling what semblances of higher thought he had. The scent of sex filled the air, so thick that Mac felt like he was breathing in pure musk.
Suddenly, Big Mac's vision exploded in stars as Rainbow brought one of her hands down on his ass in a brutal spank. The loud, meaty slap from the impact echoed through the room, only matched by the cry of bliss Mac let out. Somehow, the sharp sting only made the soupy mixture of pleasure through him more potent.
"Come on, scream for me," Rainbow growled as she brought her other hand down on Mac's still untouched cheek.
Big Mac let out a pleasure drunk scream as his ass rippled with the force of the merciless impact. His supple mound jiggled for several seconds after Rainbow's hand left it as a literal ripple traveled through his lower body. Rainbow's pounding hips only accentuated the sensations as they slapped against the stinging flesh.
And then slapped him again.
And again.
And again.
After every few pumps of her cock Rainbow gave his ass a harsh "love" tap, wringing a strangled moan out of the stallion every time.
Big Mac's eyes widened in surprise as one of Rainbow's massive hands suddenly grabbed his lithe chest. Before he could react, she hauled him upwards, sandwiching his head between her breasts as he effectively sat down on her cock. A fresh set of moans erupted from his mouth as the sudden change of position, the sounds muffled by the mounds of breast flesh on either side of his head.
Without missing a beat, Rainbow wrapped her hands around his waist and began to lift him up and down, using his body as one would a fleshlight. Big Mac hands flailed as he tried to grab ahold of something, his efforts sabotaged with each slap his his ass against Rainbow's groin. His own cock shot rope after rope of pre onto the bed, his balls throbbing as his own load built up.
"Look," Rainbow moaned out, grabbing ahold of Mac's chin and pointing his gaze downwards. Big Mac's mouth dropped open as he watched his chest repeatedly bulge outwards as Rainbow kept hilting herself in him. More than three feet of thick cockmeat was stuffed inside him, and it showed. "Look at how much you're taking. You're my cockslut now, aren't you?"
Big Mac couldn't respond, the steady thumping of Rainbow's heartbeat was resonating through him, accompanied by threatening throbs of Rainbow's flare against his skin. Thick strands of drool trailed from his mouth, seeping into his already cum-soaked fur. His mouth opened and closed as he tried to form a response.
"Arent’ you?" Rainbow asked again, quickly coming to a halt as she waited for Mac's response.
Big Mac moaned at the sudden cessation of Rainbow's fucking, his eyes locked on the titanic bulge in his belly. "P-please Rainbow! Don't stop!"
"Than tell me, are you my cockslut, or not?" Rainbow replied, her smirk evident in her voice.
It took Mac only a second to respond.
"Yes!" He shouted, scrambling in her grip as he tried to fuck himself on her rod. "I'm your personal cocksleeve! Cumslut! Whore!" The words came spilling out of his mouth in a tidal wave, Big Mac thinking of nothing other than getting Rainbow moving again.
He felt Rainbow smile above him, and without fanfare, started to fuck him again.
Big Mac had no idea how much time passed as Rainbow used him as little more than a toy. She claimed every inch of him with her divine rod, and Big Mac could do nothing but scream his pleasure to the heavens as she did so.
Suddenly, Big Mac's moans spiked upwards as he started to cum, the buildup of his orgasm buried amidst the storm of sensations coursing through him. Rainbow didn't stop fucking him as his cum spurted from him, the ropes coming in time with the mare's thrusts. The stream of cum blasted against the bed and floor as his balls tightened against him, pure waves of ecstasy exploding through him with each spurt.
Before Big Mac could process what was happening, Rainbow roared above him, and liquid ecstasy erupted into his gut. He screamed yet again as Rainbow's flare expanded outwards against his skin, a visible bulge appearing on his belly from the torrent of cum flowing into him. Before he knew what was happening, his stomach was expanding again, stretching even further as Rainbow pumped her seed into his depths.
"Take it all Mac," Rainbow groaned, holding him to as as tight as she possibly could.
Big Mac gurgled in response, going completely limp in her grasp as her orgasm continued. She must have pumped gallons into him already, and her pulsing balls showed no signs of stopping. His own cock was still spurting out his own load, forced to point downwards by his expanding belly.
Eventually, after what seemed like an eternity, the river of cum flowing from Rainbow started to slow, the mare letting out a long groan as her balls emptied their last few pints of seed into him. His head swimming, Big Mac looked in awe at his swollen belly. It was the size of a yoga-ball, and was drooping downwards to its sheer weight. Every small shift of Rainbow's and his body sent ripples through it, the mass taking several moments to finally still aftwerwards.
"Holy fuck, Mac," Rainbow groaned, wrapping her arms around him in an odd version of a tender hug. "That was awesome!"
Big Mac chuckled weakly, even in a situation like this Rainbow still managed to be adorable. "Yeah," he replied, his voice hoarse. He didn't resist as Rainbow grabbed ahold of his hand in a caring grip, resting it against his bloated stomach.
"I don't know how to say this Mac, but I'm still hard."
Big Mac's brow furrowed, but there was no denying it. Amidst the sea of warmth and semen, the undeniably pillar of Rainbow's cock was unmissable. He smiled, ow she was still hard after an orgasm like that, he didn't know, but as her personal cumdump, there was only one thing he could do.
"Well, I'm good for round three," he replied with a weak grin, his sex-soaked mane clinging to his face.
A dangerous glint filled Rainbow's eyes and she suddenly dropped him back to the bed.
Big Mac grunted as his stomach bulged outwards against the bed, instinctively locking his legs to keep his ass pointed upwards.
"Good," Rainbow replied as she once again grabbed handfuls of his plump ass. "And then we have another two after that."
Author's Note
This was a fun one to write, first anthro story on here. I hope you guys enjoyed it. Expect more of stuff like this from me in the future.
On a sad note, however, this did not have the usual amount of proofreading of my other fics, and it is most likely riddled with mistakes. So if you see any and feel obliged to help, please send me the errors to see in a pm, not a comment (please).
Thats it for now,
Gold4tune out, pce o7
