Mac's Magnificent Moobs

by Skorpion

Rating: mature
Tags: Porn, My Little Pony: Friendship is Magic, Fetish, Sex, Big Macintosh
Length: 3698

Big Macintosh drinks the wrong potion and ends up with a pair of enormous mammaries.

When the Apple family cows stopped producing milk, Applejack went to Zecora for a solution. Unfortunately, she neglected to tell Big Mac. Now the manliest stallion in Ponyville is saddled with a pair of comically oversized knockers and a list of chores as long as his foreleg - Will he be able to find a cure before every stallion in town is suckling at his fat teats, or is he destined to become Equestria's #1 dairy producer?

Hint: It's the second one.

Contains male breast expansion, lactation, weight gain, and gayness.

Published 2020-02-01 23:00:01 UTC
Last updated 2020-02-13 23:46:36 UTC

Growth

The summer sun beat down on Sweet Apple Acres. The air was hot and thick with dust, stinging the eyes and making it almost impossible to breathe. As Big Macintosh hauled the last of the apple baskets into the barn, he could feel the sweat pouring down his flanks, dripping from every pore in an unrelenting torrent. His throat felt like he'd swallowed a handful of sand. Every breath was more difficult than the last. Setting the basket down next to the rest, an immense stack that filled half of the cavernous barn, the big red stallion let out a sigh and collapsed on his haunches, breathing deeply. He'd been in the fields since before dawn, and now, if he was reading the sun's position right, it was almost three in the afternoon. Harvest season was always a pain, but with Applejack visiting their cousins in Appleoosa, and Applebloom busy with school, it fell to him to buck, pick, and store the year's crop.

Any other stallion would've balked at such a task, but not Mac; With heroic endurance, he bucked till his legs were ready to give out, then hauled every last one into the barn, where Miss Sparkle's stasis field would keep them from rotting. It was cheaper and easier than the bulky refrigeration unit they'd used in the past, with its complex system of magical crystals amplifying the cold of a single snowflake, but unlike that old machine, this field did nothing to cool the overheated stallion.

“Landsakes,” He muttered, slowly rising to his hooves, “Gotta get m'self somethin' t' drink 'fore Ah keel over.”

Tucked away in the back of the barn was a rusty old refrigerator. His father used to store his beer in there, but Mac was more of a cider drinker, so it mostly went unused. The other day, however, he'd seen Applejack stashing a bottle in there. Trudging over, he pulled it open and sighed as a wave of cold air washed over him. Sitting on the top shelf was a tall, slender bottle filled with what appeared to be milk. Rather strange, Mac thought; The cows hadn't produced so much as a drop this summer. It was a real problem, one Applejack had fretted about to no end. Somehow, she must've managed to squeeze enough for this one, single bottle. Mac's face broke out in a broad grin as he pulled it out, uncorking it and chugging the contents as quickly as his dry throat could swallow.

When it was empty, he set the bottle aside, shut the fridge door, and let out a long, deep belch. As he ventured back out into the hot sun, he couldn't help but notice a strange aftertaste. He smacked his parched lips together, trying to place it – Was the milk sour? He sure hoped not, otherwise he was in for a long and miserable evening. He should've just hiked out to the water pump, it was only a short walk through the fields... But it was too late to worry about that now. A wave of exhaustion washed over him, taking his mind off the funny, almost metallic taste clinging to the back of his throat. Climbing the steps to the farmstead, he clambered upstairs and collapsed in his bed. He was asleep before his head hit the pillow.

It was the pressure that woke him up. At first, he wasn't sure exactly what it was; It felt a bit like he had to pee, but as he rolled over, peeling away the sweat-soaked covers, something warm and squishy pressed against his hind legs, sloshing audibly. Groaning groggily, he tried to kick whatever it was out of the way, only to feel a sharp bolt of pain. At first he thought he'd hit himself in the nuts, but no, this was too far away, almost a foot away from his body. Confused, he opened his eyes and peered down the bed. Right there, right between his hind legs, sat a pair of big red balloons.

He blinked, staring in confusion at the strange things. Those hadn't been there when he went to bed. For a moment, he wondered if his balls had somehow swollen to a comical size – He hadn't whacked off in days, being far too busy to waste time with personal pleasure. That was a ridiculous idea, of course. Blueballs or not, no stallion had a ballsack the size of watermelons! Scooting into a sitting position, he winced at the unfamiliar weight in his groin.

Now that he had a better view, it was obvious that they weren't his balls. No, those softball-sized orbs were situated exactly where they belonged, right beneath his sheathed cock, whose tip just barely poked out between them. Pressing a hoof into one of the spheres, he winced at the pressure. Whatever they were, whatever was in them, there was far too much of it. Then he noticed the little nubs poking out the far end, and the pieces fell into place.

“Ah... Ah've got boobs,” He said slowly, unable to believe what he was saying, let alone seeing and feeling. Reaching out, he prodded one of those nubs – Nipples, he realized – And felt a funny tingling sensation as something warm and wet leaked out. The tip of his hoof was white, and a cautious lick proved it to be nothing other than milk! The revelation sent a thrill of panic down his spine. A million thoughts filled his head at once, questions with no apparent answers. How? Why? What strange magic could've caused a stallion – A very masculine stallion, thank you very much – To have grown such a massive pair of knockers overnight? And what in Equestria's name was he going to do about it?

“Maac!” Granny Smith's voice called out from downstairs, “Breakfast is ready!”

Snapping back to reality, Mac's stomach dropped at the thought of facing his family in this state. How could he explain this? Slowly, the busty stallion moved to the edge of the bed and winced as his new teats flopped down. Droplets of milk sprinkled across the floorboards, leaking from his heavy knockers. The pressure was hard to bear; Before he did anything else, he'd have to find some way of milking himself.

Slowly shuffling over to the door, he tried to ignore the sloshing as his breasts swayed back and forth, bumping against his inner thighs. Peering into the hall, it was deserted – Applebloom was probably at school by now. Darting into the bathroom, he locked the door behind him and climbed into the bathtub. It was the only thing he could think to do. The toilet was too small, the sink too high to rest his breasts upon. Lowering himself onto the cold porcelain, he reached out a tentative hoof and squeezed one of his nipples, letting loose a spurt of milk. Something warm and tight rose up in his chest as he caressed the stiff little member, and a stirring sensation told him that his cock was starting to harden. It felt so strange, so wrong, yet so... Good?

Biting his lip, he gave another squeeze, and couldn't quite stifle a moan as more milk shot out, smacking the far side of the tub and trickling down the drain. Dimly, he realized that this must be how a cow felt. Between those massive mounds, his cock stirred to life, twitching and pulsing even as he worked his new teats. Pressed between them, it was like grinding his dick between a pair of warm pillows. Every sloshing motion sent twinges of pleasure through his loins, and with a perverted smile, he let go of his turgid nipples and pressed his hooves against his teats, squishing them against his cock. Gyrating his hips, his cock rose up and down between them, harder than it had ever been before. Pearlescent jizz leaked from the flat tip, sliding down a foot and a half of manmeat before disappearing between his breasts.

“H-horseapples!” The stallion howled as he came. A third white stream joined the two others, this one shooting straight up from his throbbing dick, splattering the ceiling and sending a sticky rain down upon his head.

Mac wheezed, leaning against the cold porcelain side of the tub as the last of his orgasm oozed down the drain. Slowly, his pounding heart slowed to a steady drumbeat, and he groaned, rising to his hooves. His fur made a ripping sound as the half-dried cum and milk pulled away from the tub, leaving a few red strands on the white. The bathroom looked like somepony had dumped a jar of mayonnaise in a ceiling fan – Cum and milk covered the tiled walls, the floor, the ceiling, there were even a few drops on the mirror! As he approached, he noticed splotches in his blonde mane, and groaned.

Showering was a difficult task, as was cleaning the bathroom. By the time the stallion made it downstairs, Granny Smith was plucking the last few stray hashbrowns from her plate. She glanced up at her grandson with a look of inscrutable amusement, then turned back to her meal. She didn't say a word as Mac slowly waddled past, being careful to keep the table between the two of them, to keep her from seeing the red balloons sloshing betwixt his thick applebucking thighs.

“Bathroom trouble, eh?” She chuckled, “Ah heard all o' dat gruntin' n' such. Don'cha worry none, Ah know a thing 'er two 'bout that. This ol' keister gives me nothin' but trouble these days, Ah swear. Say,” Leaning over the table, she peered down, squinting. Mac shifted uncomfortably, like a child trying to hide a stolen sweet behind his back, “Y'all are lookin' a bit funny this mornin'. Didja put on weight?”

“Uh, eeyup,” Mac said, “Think Ah'll skip breakfast t'day an' head inta town. Gotta see Miss Sparkle 'bout somethin'.”

Granny laughed and shook her head. “Now, Mac, y'all eat more 'n any stallion Ah ever knew, save for yer father, Faust rest his soul,” She nodded respectfully, and so did Mac, “If'n y'all skip breakfast, yer never gonna be able t' finish yer chores fer t'day!”

“Ch-chores?” Mac stammered. The bottom dropped out of his stomach. His head swirled – He forgot! There was still a whole list of chores for the day, his work, Applejack's, and even Applebloom's small share all rested on his shoulders. Looking at the fully-loaded plate, he felt vaguely sick as, one by one, the pieces fell into place.

“Oh, an' while yer in town, mind pickin' up a bottle o' milk? T'ain't as good as our own heifers, but it'll do in a pinch.”

Mac's face turned an even deeper shade of red at that. His teats let out a gurgle of their own, and he hastily excused himself, hustling to the door as quickly as his milkbags would allow. Before leaving, he grabbed a long overcoat from a peg and draped it over himself, before venturing out into the morning heat.

“Poor boy. He's definitely got th' runs,” Granny muttered to herself as the door slammed shut, and she heard his hoofsteps pounding down the stairs.

Creamy Showers

The overcoat was a mistake. As Mac trudged down the dirt road into town, he was willing to admit that to himself. The day was young, but the temperature was rising, and dragging his new teats along was like hauling a heavy cart, only a thousand times more awkward and exhausting. By the time he reached the town line, he was soaked in sweat from mane to tail. Ponies stared at him, no doubt thinking he was crazy to wear such a heavy garment in this weather, but he ignored them. He had to keep his mind on the task at hand. His teats sloshed gently between his legs, his stiff nipples tingling; The pressure was already starting to grow again, not unbearable, but impossible to fully ignore. Every once in a while, a little twinge would work itself way up his spine, filling his mind with something between pleasure and pain.

Miss Sparkle. That's where he was going. His first impulse was to go to the hospital, but no, that was too open, too... Public. Mac wanted to get this problem solved as quickly as possible, without spending an hour in a waiting room, and without being poked and prodded by half a dozen doctors. They'd probably write a case report about him in one of those fancy medical journals. 'The Stallion Who Grew Tits Overnight', he could just about see it, alongside a picture of Nurse Redheart fondling his big red apples. No siree, he didn't like that one bit.

On the other hand, he felt that he could trust Princess Twilight to be discreet. She'd bring him into her lab, cast a dispell or make him drink some potion, his tits would shrivel up and he'd be right as...

“Expecting rain, Mac?” Thunderlane's voice started him, and he spun around as fast as his ungainly bulk would allow.

“L-Lane!” He stammered, heart leaping into his throat. Mac's best friend looked at him quizzically, his feathers ruffling as his wings folded upon his back. The black pegasus had a habit of swooping in unannounced, but Mac rarely startled. Right now, the earth pony looked like a bunny caught in the path of a raging manticore. A tall, broad-shouldered bunny wearing an oilskin coat that reached almost to his hooves, in the middle of an intense heatwave.

“Are you feeling okay?” He asked, taking a step forward.

“E-eeyup!” Mac squealed, scuttling back a couple steps. Oh, Celestia's mane... His eyes bugged out as his teats throbbed, so full he could practically hear them creaking. The skin was stretched taut, pressing against the muscles of his inner thighs. Powerful as those thick chords were, the continued strain was making them feel weak and wobbly. And... The sight of Thunderlane didn't help. Here was a big, powerful man who could help squeeze every last drop of delicious cream from his achingly full milkbags... Mac winced at the thought. Where had that come from?

“Buddy, you need to take that thing off, you'll have a heatstroke.” Unfurling his wings, Thunderlane wrapped one around Mac's shoulders, holding him firmly but gently. Before the red stallion could draw away, he popped open the clasp and pulled the coat over Mac's head, draping it over his own back for safekeeping. As expected, he was completely soaked in sweat and shivering slightly. His flesh was hot to the touch, and... Thunderlane frowned. What was that warm, soft thing pressing into his leg?

The pegasus glanced down. Then he glanced up at Mac's face, then back down. Letting go of the stallion, he took a step back, his eyes focused on the two fat round orbs hanging from his best friend's crotch, just south of his balls. A thin trickle of milk leaked from one of the teats, collecting in a little pool on the ground. Mac scuffed a hoof against the dirt nervously.

“Mac...” Thunderlane asked slowly, with a voice as flat as the disc-shaped world of Equestria, “Are those tits?”

“Eeyup,” Mac replied. He voice was steady, but he couldn't quite meet Thunderlane's gaze. Something in those big yellow eyes seemed... Strange. The way his jaw didn't quite close when he finished speaking, and the way his tongue rolled around the insides of his cheeks, bulging against the surface in little concentric circles, first the right side, then the left... Thunderlane took a step forward, and Mac matched him with one step back.

“Can... Can I taste it?” He asked, ears flat against the top of his head.

“N-no.”

“But... But I want to.” The way he said it made it clear to Mac that Thunderlane didn't just want to taste his milk, he felt a powerful, all-consuming urge to latch onto him and guzzle as much rich cream as his lean, athletic body could manage. His eyes seemed to gleam in the rising sunlight. Mac glanced left and right, his mind racing as he searched for something, anything to help him get out of this, but it was no use. His hoof came down on the side of a rock, making him stumble slightly. With the added pendulous weight in back, his aching leg gave out, and he toppled over.

Before the dust could settle, Thunderlane was upon him. Pushing the stallion onto his side, he wrapped his lips around one of those stiff nipples, his teeth gently pinching the surface. A shiver rose up Mac's spine. He tried to pull away, but his whole body felt like it was made of rubber. He could no more stand up than he could shove Thunderlane away, whose ravenous sucking was starting to draw a steady stream from the stallion's overpressurized teat. Strange as the situation was, the relief was palpable. Mac let out a sigh as the agonizing pressure slowly started to lower.

A snuffling sound came from Thunderlane, something between a moan and a gasp as the warm, rich flavor filled his mouth, clinging to the inside of his throat. Just a few gulps and his stomach was already groaning from fullness. It was heavy cream alright, less a calorie bomb than a calorie nuke. Under normal circumstances, the athlete would never have allowed himself such a flagrant violation of his diet. Under the influence of magic, or hypnosis, or pure, simple, animalistic lust, he couldn't stop himself from chugging down the constant stream of cream. His stomach bulged out, growing round and heavy-looking. It rose and fell with every gulp, but mostly fell lower and lower.

Mac stared at him in wonderment; Judging by the size of that gut, he should've sucked both of his teats dry by now, but the flow was still going strong. The pressure hadn't abated, but it was balanced, the inflow more or less equal to the outflow, but that was swiftly changing. Already, Mac could feel a shifting deep within his body as some gland or another kicked into overdrive, and an unbearable heat washed over his body, focusing on his teats. His stiff cock jutted out between them, twitching and throbbing, unnoticed by either stallion. Slowly, it began to disappear. At first it seemed to be shrinking, but no, Mac's breasts were growing!

“L-Lane, snap outta it!” Mac squealed, trying to push him away with a hoof, but the pegasus just growled and latched on harder, continuing to suck. Thunderlane's normally rock-hard body was starting to seem soft around the edges. His flanks seemed abnormally wide, and his legs... The stallion shifted his posture, spreading them wide. Was it just Mac's perspective, or did his hips sag down just a little..?

All of a sudden, Thunderlane's hind legs collapsed beneath him, and he hit the ground with a wet smack. The pegasus snorted, and twin streams of milk shot from his nostrils... And from two other holes, somewhat lower down. Mac's eyes followed Thunderlane's to his groin, where a pair of small, rounded moobs had sprouted just above his rock-hard cock. The mottled pink-and-black shaft twitched as his new tits sagged out further, the little nubs of nipples growing noticeably hard.

“W-what in Celestia's name..?” Thunderlane trailed off as he pressed a hoof into one of his new breasts, wincing at the unfamiliar sensitivity. Right now, he was undergoing the same mental struggle Mac had undergone earlier – He could see the conflicting emotions, the confusion, fear, and lust evident on his face. His tits weren't too big yet, maybe the size of softballs; He wouldn't even need a coat to hide them, but people might notice his somewhat heftier body. Mac thought he looked fifty pounds heavier, like he'd been cheating on his diet for a few months. His hips were wide enough to be seen from the front, giving him plenty of room for those brand new milkbags. Room to grow, Mac thought with a twinge of reluctant excitement. Thunderlane pressed them against the base of his cock, biting his lower lip as a gurgle rose up from their creamy depths.

Mac looked down at his own knockers. They were at least twice as large as before, so big he couldn't properly close his legs around them. A tiny shift in his weight caused them to flop over, dragging the rest of his body with them like an overweighted anchor capsizing a ship. They hit the ground with a wet smack, and twin streams of milk spurted from his nipples. They were full, not painfully so, not like before, just... Ready. Fertile. There was a lot in there, ready to come out. If he were a cow, this would be around the time he'd start ringing his bell to get milked. Since he was a stallion instead, all he could do was grunt, and slowly clamber to his hooves. His nipples touched the ground – They were longer than before, pressing against the pebble-strewn road. The rest of the walk into town wasn't gonna be a fun one.

“Lane?” He tapped Thunderlane's shoulder, “Lane, we need t' git goin'.”

“M-moo-Mac?” The pegasus let out an odd bellowing noise, his voice hoarse from the strange sensations flooding his body.

“Lane, buddy, we dun' been magicked. We need t' go see Miss Sparkle, pronto, a'fore this gets any worse.”

“B-but it feels goooood,” The vowel stretched out endlessly, rolling off Thunderlane's curled tongue. For a moment, Mac felt the overwhelming urge to turn away and leave the milk-starved pegasus to his own devices, probably playing with his own teats until they blocked the road. He couldn't just leave him, though, Lane was his friend! Even if there was something funny lurking behind his eyes, something that made him lose all self-control and start sucking another man's nipples unbidden... A shiver ran down Mac's spine as he wrapped a hoof around Thunderlane's withers and helped him to his hooves. The pudgy stallion wobbled slightly, but followed along as Mac started down the road... The long, long road to town.