Mac's Magnificent Moobs

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.