Thick, Red, and White All Over

by Nostalgia Schmaltz

Rating: mature
Tags: Sex, Big Macintosh, Alternate Universe, Anthro, My Little Pony: Friendship is Magic, Rainbow Dash
Length: 4625

Rainbow Dash uses a cock-growth potion on Big Macintosh. Sexytimes ensue.

At the end of another long day of work, Big Macintosh spends some quality time with Rainbow Dash, and as usual, this leads to some delightful "fun". However, the pegasus is quite eager to make one of her fantasies a reality, and a certain zebra's brew helps her do just that.

Yes, yet another "Zecora's potion causing sexy fetish-related effects" story. Super original.

Fetish warnings: Hyperphallic (like, really hyperphallic. For real.) and glorious amounts of Bukakke.

Outline by The Masked Clopper
Written by Nostalgia Schmaltz

Published 2014-08-23 18:00:03 UTC
Last updated 2014-08-23 18:00:03 UTC

And thus, Big Macintosh lived up to his name

After yet another day of working in the fields with his sister, it was time once more for Big Macintosh to relax with one of his more favored mares. Walking out to the south field where he agreed to meet, he saw the pegasus in question already waiting for him, sitting up in one of the trees just ahead. Her light-blue coat and rainbow mane stuck out against the green of the tree, making her quite easy to spot even from a distance.

"Heh, took ya long enough!" her voice called out in a playful tone before she dropped down from the tree, facing the approaching stallion and jogging up to him, immediately embracing him in a soft hug as she grinned up at him. "Applejack keep you extra long, eh?"

"Not too much longer than usual." Big Macintosh chuckled and gently wrapped his arms around Rainbow, lightly rubbing her back. "You're just a might impatient." he smirked playfully in return, getting the mare to giggle softly.

"Yeah yeah, I guess...I can't help but be impatient when I'm so excited!" Rainbow poked her tongue out for just a moment before she broke away from the hug, her hands sliding down to Big Macintosh's waist. "If you knew what I had in store for you, you'd be impatient too!" she smirked now, getting a raised eyebrow from Big Macintosh.

"You what?" the stallion blinked a couple times, having completely forgotten what the pegasus was referring to. "I dunno what you're talking about."

Rainbow giggled again and shook her head, crossing her arms over her chest now. "You already forgot?" she then raised her right hand and poked the stallion's snout. "Think. What did you agree to last night when we were having fun together?"

"Having...hmm..." Big Macintosh looked up again as he tried to remember back to the previous night. He certainly remembered the usual night of "fun" with Rainbow in the attic of the barn, but clearly there was a specific detail he was missing.

--CUE WAVY FLASHBACK--

"Mmmpmh...mmm..." Rainbow groaned softly around Big Macintosh's shaft, steadily bobbing her head up and down while keeping her lips pursed tightly around it. At the same time, her tongue was firmly pressed against the underside, dragging up and down the length with each bob of her head.

"Ahh...th-that's it..." Big Macintosh sighed and leaned his head back, lightly resting it against the wooden beam on the wall behind him, while his right hand gently rested on the rainbow mane below, feeling it rise and fall at a steady pace. "Gonna...ahh...ngh!" he suddenly grunted and pressed his hand down a little more firmly as a surge of pleasure coursed through his body, concentrating between his legs as it peaked, pushing the stallion over the edge of his orgasm.

"Mmngh!" Rainbow grunted lightly from the sudden force pushing her down, though before she could think any further, she felt that familiar rush of steamy fluid gush into her mouth, only to be immediately gulped down her throat. Her tongue continued to swirl around his shaft, trying to coax out as much of his load as she could. After a few sizable loads, the flow finally came to a stop, prompting her to lift her head back up again. "Aaahh...delicious as usual..." she sighed after taking a breath, licking around her lips and grinning up at the stallion, who was still panting with his eyes closed.

"Oooh...y-yeah..." Big Macintosh let out a long sigh as his afterglow kicked in, his eyes only opening halfway again to glance down at the lusty pegasus below. "And you've...mm...got a skilled mouth, as usual..."

"Heh, damn right I do." Rainbow giggled and brought a hand up, stroking the stallion's spent member a bit. "I still want more though, stud." she teased, licking her lips again and smirking playfully.

"Mmnh, more? Well, uh...go ahead, then?" Big Macintosh blinked a bit, rather confused at the pegasus' request.

"I mean...I want a LOT more. More than you can give me right now." the pegasus blushed lightly now, but kept her playful smirk. "I think it'll have to wait until tomorrow night, but...you think you'd be up for it?" she leaned in a little closer, stroking her hand up and down a little faster now, eliciting a soft moan from him.

"Ahh, y-yeah...whatever you say!" Big Macintosh groaned lightly, before suddenly being cuddled by the pegasus, feeling her soft mounds squish against his chest.

"Heh, good...now let's move on to round two." Rainbow giggled and kissed the stallion's cheek, using her hand to guide his stiff shaft towards her warm snatch...

--END WAVY FLASHBACK--

Big Macintosh turned his head slightly to the side, before looking back at Rainbow again, still raising an eyebrow. "I don't remember exactly what I agreed to."

"Oh, you big oaf." Rainbow giggled again and shook her head. "Whatever, it'll be fun, trust me. Let's just get started though." she grinned again and leaned in, gently pecking the stallion on the lips while one of her hands slid down his body and into his pants, grasping at the bulge in his boxers.

"Mmf...if you say so." Big Macintosh sighed contently as he felt that hand squeezing at his package, only helping it harden further. At the same time, his own hands slid back up Rainbow's body and to her chest, lightly groping and rubbing over the soft mounds. Before he knew it though, the pegasus was already undoing his pants and lightly pulling at his member, slipping it through the middle of his boxers, now stroking it directly.

"Hehe...looks like you're getting as excited as me." Rainbow teased, blushing lightly despite her playful smirk; her hand squeezing at the stallion's shaft as it continued to harden, nearing its full size already. "First a little bit of a warmup before we get to the real fun." she winked before kneeling down in front of the stallion, staring at his member now as her head became level with his waist.

Not wasting any time, she leaned right in and began to lightly slurp at the tip of the now fully hard stallionhood, causing Big Macintosh to lightly groan from the resulting tingles of pleasure. At the same time, her hand continued to stroke up and down the length, while her other hand slid down lower and cupped his balls; the fingers on that hand slowly stroking all around the smooth orbs, only further teasing the stallion with pleasure.

"Aahh...just can't get enough...mmnh, of me, can you?" Big Macintosh teased, grinning down at the pegasus and watching her service his cock, his right hand sliding up from her shoulder and to her head, lightly stroking through her soft mane. Even the light stroking and slurping was quite enjoyable; his hips instinctively bucking just a bit against Rainbow's mouth and tongue, while thick droplets of precum flowed forth from his member, only to be immediately slurped up by the warm tongue.

"Mm, 'course I can't...you're just so tasty." Rainbow's blush deepened slightly as she kept slurping and stroking the throbbing stallionhood in front of her, tasting the warm pre as it smeared over her tongue. As she kept up her work, her own sex moistened further; already creating quite a damp spot on her panties, while her wings began to spread and stiffen as well.

"Well, ah...take as much as ya want...my horny pegasus!" Big Macintosh groaned happily, continuing to stroke his hand through the pegasus' mane while his hips began to lightly buck forward against her mouth and hand. "You know I've got, ngh, more than enough!"

Hearing this, Rainbow smirked a bit and began to suckle on the tip of the throbbing member in front of her, swirling her tongue around it in just the right way to send jolts of pleasure through it. "Mmnh, you're about to have way more than enough!" she closed her eyes and lightly groped at the stallion's balls with her whole hand, stroking over them as best as she could; eager to please the stallion as much as she could for the moment.

Of course, the big stallion responded with pleased grunts and moans, feeling his cock throbbing harder and oozing more precum as his pleasure was pushed higher. He soon closed his eyes as well, continuing to buck his hips forward, sliding his member just a few inches in and out of Rainbow's mouth; the short distance easily pleasing him due to the constant movement of the slick tongue along the underside of his shaft.

As she kept up her oral work, Rainbow opened one eye, glancing up at the stallion and seeing the blissful look on his face, with both eyes closed. "Heh...now for your surprise..." she bobbed her head a few more times before suddenly taking her mouth off, jerking the stallion off a little faster while her other hand pulled back from his balls and quickly slipped down into her cleavage, re-emerging with a little vial of green liquid between two of her fingers.

"Mmnh..? Why'd you stop?" Big Macintosh looked down again as his eyes opened, both widening in surprise as he saw the pegasus pouring out the green liquid over his cock. "Rainbow? What's that you're putting on Little Macintosh?"

"Hehe, remember when I said I wanted a lot more?" Rainbow smirked back up at him, still jerking her hand up and down his member, rubbing the green liquid all along it, while a good amount of it dripped down onto his balls as well. "I got a nice little potion from Zecora that will give me just that!"

"Wha...huh?" Big Macintosh shook his head and raised an eyebrow, but before his train of thought could go any further, he gasped and winced, feeling a strong tingling in his package. "Aahh..p-potion...?" he groaned, feeling a little dizzy and leaning back against the tree behind him, while Rainbow let go of his shaft and watched it intently.

"Uh huh...Zecora said it'd give me just what I wanted..." Rainbow smirked and licked her lips, her eyes focused on the stallionhood in front of her, watching every twitch and throb it gave. Only moments later, she noticed it start to grow longer, causing her cheeks to blush once more. The remnants of the green liquid faded away into the twitching erection as it continued to swell, every passing second adding another inch to its length.

"Aahh..wh-what's that potion doing to me?" Big Macintosh managed to groan, though he too began to notice his member growing even bigger than its already decently large size. "What in Celestia...I'm growing..."

"Bigger..." Rainbow's cheeks both flushed a deep red as her arousal skyrocketed; the sight of that throbbing stallion cock growing bigger and bigger by the second only serving to arouse her even further. "Grow bigger..." she reached forward and grasped the growing length once more, now at least two feet in length and showing no signs of stopping. Big Macintosh moaned as his body shuddered in response to even the soft touch; his member becoming increasingly sensitive as it continued to grow larger.

"Mmnh...Rainbow.!" Big Macintosh groaned out loudly, his legs wobbling and slowly giving out from the growing pleasure and weight of not only his erection, but his balls, which seemed to be ballooning massively to match the size of his stallionhood. With a groan, he plopped down onto his rump, sitting back against the tree now while his member continued to swell before his eyes. "It's not...nngh...s-stoppin'!"

"Oh yes...that's what I wanna see!" Rainbow grinned eagerly now, stroking both of her hands up and down Big Macintosh's now 3-foot erection, watching it bob back and forth with each throb it gave. Glancing down lower though, she spotted his massive balls and felt another surge of arousal course through her body; her hands immediately sliding down the stallion’s shaft and around those two massive balls, easily the size of beach balls and still growing. "Damn, Zecora wasn't kidding when she said it'd make you grow!"

All of the teasing those soft hands were doing easily coaxed out more of the stallion's precum, but this time in larger globs, oozing forth from the big slit at the tip and flowing down the length. "Mngh...oh sweet Celestia..." Big Macintosh groaned lustfully; his mind telling him that having such a massive endowment was rather impractical, but he couldn't deny the wonderful pleasure that it was bringing him. In his sitting position, the tip of his shaft was now a good bit above his head as his cock surged past five feet in length, with an incredible girth to match.

"Mm, yeah...grow for me!" the lusty pegasus continued to fondle the stallion's huge orbs as she watched him continue to swell and swell with size. "You're so damn big...I had no idea the potion would be this powerful!" she gently bit her lip while her wings twitched lightly, both spread stiff from her heavy arousal. Sliding her hands up from the big red balls, she resumed stroking at Big Macintosh's shaft, rubbing her hands up and down the whole length while she leaned in closer, slurping near the middle of it.

As she did though, she began to slowly stand up, dragging her tongue up the length of that overgrown cock and soon reaching the tip as she stood up fully, her tongue meeting a rather large glob of precum at the tip. "Mmm, tasty..." she sighed blissfully, eagerly lapping up the stallion's precum while her arms wrapped around the shaft, gently hugging it close to her body.

"Nnh...R-Rainbow..." Big Macintosh groaned in response to all the teasing; his cock throbbing quite powerfully as the growth finally slowed to a stop; his endowment just shy of six feet in length, with an incredible girth to match. "I'm not so...ngh...sure about this..." he looked up with lidded eyes at his monstrous stallionhood, watching the pegasus cuddling against it and slurping the tip, sending tingles of pleasure through the whole length with each stroke.

"What're ya talking about?" Rainbow smirked down at the stallion, continuing to rub her hands along his shaft as she cuddled against it, enjoying the rhythmic throbbing against her whole body. "This is even better than I imagined...mmm...with a package like this, you'll be able to cum so much!" she blushed a bit with those last words, imagining just how much the stallion would put out with those massive balls of his.

Already, the massively grown cock was oozing globs of pre every few moments, each one almost a mouthful of warm, sticky deliciousness for the horny mare to slurp up. With her body pressed against it and her arms wrapped around it, she began to lightly grind her body against the massive erection, while her arms stroked up and down the length; the stallion groaning loudly and squirming from the surges of pleasure the horny pegasus was inducing upon his shaft.

"Ooohh...ahh...ffuuuuggghhhh...!" Big Macintosh closed his eyes and leaned his head back against the tree, his hands lightly gripping at the ground on either side of him as he continued to enjoy the intense pleasure; his member having become incredibly sensitive from its growth, amplifying the pleasure of the mare's rubbing and grinding multiple times over.

"Mmnh, I take it...my big stud is enjoying himself?" Rainbow teased with a bit of a smirk, still blushing cutely as she grinded her body along Big Macintosh's shaft and rubbed it a little faster, still slurping repeatedly around the engorged head, lapping up the constant flow of warm pre. By now, she was dripping wet as well; incredibly turned on by the size of the stallion's meat and greatly enjoying the feel of it throbbing against her body as she rubbed it. "How about...mm, we change things up a bit..."

Feeling the pegasus moving again, Big Macintosh leaned his head back up and began to slowly open his eyes, though they opened wide in an instant as he realized what he was looking at. Right before his snout was Rainbow's rear, lightly wiggling a bit; a small streak of moisture visible running down her inner thigh as well.

"Don't leave me hanging, Mac." the mare teased, smirking back at Big Macintosh albeit with blushing cheeks. Already, the scent of her strong arousal was flooding the stallion's nostrils, pushing his arousal even further still. "You're not the only one who's really horny, you know." she added, rubbing her arms a little more firmly along Big Macintosh's engorged shaft, making him groan happily once more.

"Ngh, yes..." Big Macintosh sighed contently, reaching his hands up from the ground and groping at the pegasus' cutie marks, lightly squeezing her rump and pulling it a little closer to his snout. He leaned his snout in forward as well until he felt his lips press against the mare's nethers, feeling their intense heat and moisture brush against his lips. Without even thinking about it, his tongue pushed past his lips and pressed right up against that moist slit, firmly stroking along it and lapping at the sweet flavor it contained.

"Oooh...!" Rainbow groaned immediately in response to the slurping, lightly shuddering from the resulting tingles of pleasure and leaning a little harder against Big Macintosh's cock, giving it some more slurps of her own. "That the stuff...nggh..." she panted lightly, continuing to rub her arms up and down the massive member, feeling it throbbing more frequently against her body, gushing noticeably bigger globs of precum. Having gulped down quite a few mouthfuls of it already, she moved her tongue back a bit, slurping all around the tip now, instead of just near the slit, smearing her warm saliva all over while the stallion’s tongue did quite the same between her legs.

With more pleased grunts and groans, the stallion squeezed a little more firmly at Rainbow's flanks, pressing his tongue into her sex now and eagerly slurping around at the sweet warmth within, causing the pegasus' moans to intensify as well. All of the pleasure coursing through her sex only made her squeeze his shaft tighter, nuzzling against it more firmly as well.

"Mmnh, yeah...keep that up!" she groaned, her eyes lidding as she lightly pressed back against Big Macintosh's snout, helping to slide his tongue even deeper inside her. At the same time, she could feel the gigantic stallionhood throbbing harder against her body, splashing a glob of precum against her face. "Heh...mm...is someone about to cum?" she teased, suddenly bringing her rubbing to a halt, simply hugging the massive shaft against her body and enjoying the feel of its constant throbbing against her.

As his pleasure slowed considerably, Big Macintosh whined softly into the pegasus' snatch, still slurping along the silky inner walls and getting as much of the mare's sweet nectar as he could. Despite the mare slowing her efforts, he kept up his own; sliding his tongue as deep as he could into that warm snatch, eagerly slurping all around inside it.

"Aahh, feels like...mmnh, someone's about to blow..." Rainbow teased between her soft panting, turning her head to glance back at the stallion as she kept pressing back against him. "I think you owe me...a favor, first!" she groaned and closed her eyes as she felt Big Macintosh's tongue push even deeper inside her, stimulating her sex even further and only causing it to lightly squeeze against his tongue; her own orgasm not too far off.

With the mare’s soft hands and arms still gently rubbing along his erection, Big Macintosh could only groan with lust, being kept on the edge of his orgasm as he kept up his oral work. More eager than ever to bring the pegasus to orgasm, he continued to shove his tongue as deep as he could inside that warm snatch, putting as much effort as he could into slurping against the silky inner walls.

"Ahhh...oh yeah...!" Rainbow cried out blissfully, leaning her head back and pushing a little more firmly back against Big Macintosh's snout, feeling her pleasure starting to peak from the rough tonguing she was receiving. "Cumming...nnggh..." she managed to groan before squeezing the stallion's cock tightly to her body and shuddering as her orgasm rocked her body. Immediately, a torrent of her juices gushed forth, soaking her partner’s tongue and flowing down into his mouth, filling it with the sweet taste of her carnal juices.

The horny stud eagerly gulped down that sweetness, still slurping inside the love tunnel a few moments after, lapping up every last bit of the warm nectar before his tongue finally pulled back out. "Aahh...s-sweet as ever..." he sighed, panting a bit as he licked his lips, though as his eyes finally opened again, he saw Rainbow slowly getting up and climbing off of him, letting go of his member as well. "Mmnh..? Where ya goin?" he blinked a couple times in surprise, watching the pegasus completely climbing off of him and sitting herself down on the grass in front of him.

"Heh...just getting in position for the big finish..." Rainbow teased, panting softly herself as she reached forward once more and grasped Big Macintosh's shaft, smirking lustfully at him as she began to stroke it up and down again. "I made you this big for a reason...mmnh...and judging by your size, I'm about to get even more than I thought I would!" she giggled softly, glancing down at the two gigantic red balls between the stallion's legs, both of them churning lightly as they prepared to release the loads they contained.

"Aahh...ngh!" Big Macintosh groaned and leaned his head back again as the pleasure resumed, his hands once more gripping at the ground on either side of him. "Gonna...nghh...cum!" he moaned, his hips lightly bucking upward against the mare's stroking hands as the pressure built up more and more; larger globs of precum gushing forth and flowing down the length of his shaft, some of it being slurped up by the horny pegasus in front of him.

"C'mon, you big stud..." Rainbow giggled softly as she stroked Big Macintosh's cock even faster, pressing her hands more firmly against it as well. "Show me a big load!" she leaned back a bit, pulling that huge shaft back a bit as well, angling it just right so that it would give her a nice shower. With only a couple more moments of rubbing, she heard the stallion let out a loud groan before his hips bucked upwards; his member throbbing even harder against the soft hands that were stroking it.

The first shot of Big Macintosh's seed was more reminiscent of a geyser, one big stream of thick seed gushing straight upward, only to splash back down onto Rainbow, soaking most of her body with the warm, gooey liquid. before the first stream even died down, a second torrent of seed gushed forth, providing an almost continuous shower of steamy stallion spunk for the now white-soaked pegasus.

"Mmmngh, ahh...s-so damn much!" Rainbow groaned, a bit overwhelmed by the size of the loads gushing down upon her, but she enjoyed it nonetheless; her stiff wings twitching as they were soaked too, while the rest of her body soon became almost completely covered with the hot seed. All the while, her hands never stopped rubbing up and down along the giant, throbbing stallionhood before her, eager to milk it as much as she could.

"Oohh...s-sweet Celestia!" Big Macintosh managed to groan, still panting heavily in the midst of his powerful orgasm, each throb of his member sending a wave of pleasure through his whole body. Opening his eyes halfway again, he saw the now cum-soaked pegasus still rubbing and cuddling against his overgrown shaft, slurping along the head of it as well. "Rainbow...ngh..."

"Oh yeah...give it all to me!" the pegasus panted and moaned softly, slurping up lots of the warm seed as it kept splashing all over her; every inch of her body now soaked with the stallion's cum, dripping down into the big puddle of it below her. Despite cumming just a minute ago, she already felt incredibly aroused once more, pressing her body a little more firmly against Big Macintosh's shaft as she rubbed and licked at it.

After a few more surges of cum, the stallion's orgasm finally began to die down; the huge gushes slowing down to smaller flows, and then to a slight oozing while his afterglow began to kick in, leaving him very light-headed for the moment. "Mmmnh...ohh..." he groaned, panting a little more heavily as he fought to remain conscious; bringing a hand up and rubbing his forehead gently, still watching the cumsoaked mare in front of him.

Slurping at his member a couple more times, Rainbow finally sighed contently, her rubbing slowing to a stop as she gently cuddled against the stallion's giant shaft. "Ahh...damn, I didn't think...you'd cum that much!" she softly groaned, blushing heavily under the coating of sticky seed all over her face. Gently licking around her lips, she grinned a bit at the stallion, who gave her a bit of an embarrassed look in return. "Enjoyed yourself, ya big stud?"

"Of course...nnh, I've never cum so hard in all my life!" Big Macintosh took another deep breath as the light-headed feeling started to fade away, his hand falling back to his side again as he tried to sit up a bit. "But, uh...looks like I really made a mess of you." he smiled a bit, looking up and down Rainbow's body, her usual light-blue and rainbow colors now completely covered in a fresh coat of white.

"Mm, and that's exactly what I was going for...heh..." Rainbow giggled softly and nodded, her hands slowly rubbing the stallion's cock again. "I've always wondered what it'd be like to be...y'know, covered in cum." she grinned a bit more nervously now, licking around her lips again as the warm seed oozed down her face. "Just something that popped into my head one day!"

Raising an eyebrow, Big Macintosh grinned a bit more, chuckling softly. "So that's what you meant, huh? Ya could'a just told me." he sat up a bit more as he regained his energy; his shaft continuing to lightly throb against the mare cuddling it. "I had no idea you were this kinky, Rainbow."

"Mmnh, not all the time! I was just really curious!" Rainbow poked her tongue out while her wings flapped a bit, shaking off some more of the seed that had splattered all over them. "You had fun though, didn't you?"

"I think you know the answer to that." Big Macintosh chuckled softly again, reaching down and rubbing his overgrown erection gently, feeling it continue to lightly throb against his hand. "But, uh...this ain't permanent, is it?" he looked up at the cumsoaked mare again, who was gently rubbing her hands over her own body, smearing the warm seed against her coat.

"It shouldn't be. Zecora said it would only last a little while." the pegasus shrugged, before grinning back down at the stallion, reaching her hands down to his member and rubbing it some more. "Looks like it hasn't worn off, yet...does my big stud want another explosive orgasm?" she teased with a playful smirk, starting to rapidly stroke her hands up and down the length of Big Macintosh's shaft, causing him to groan from the teasing pleasure.

"Aahh...if you think you can handle another explosive orgasm, you horny mare!" Big Macintosh grunted, smirking back at her as he leaned back against the tree again, before closing his eyes and groaning happily, his giant stallionhood already beginning to gush globs of precum from the mare's rubbing. "I just hope the potion lasts long enough...mngh...!"

TO BE CONCLUDED