Poni-Gurls: Muscles Are Magic

Breasts. Arthur’s whole world was tits. First Summer’s growing tits pushing him back towards what he understood was both the purple gurls he’d met earlier today, including the one without glasses who had given him such an exquisite blowjob to keep him edged for nearly an hour, and the other one with glasses who had finally finished him off, had somehow fused together into one super muscular ponygurl.

She sported a large spiral horn and was wearing both the glasses and crown of both gurls, which he supposed was a tipoff that his theory was correct. He looked up at the large gurl who smiled apologetically before giving his huge cock a kiss to the side of one large vein tracing up the side of his cock with her firm lips, the vein larger than both his arms and legs combined, let alone how massive his cock had become.

He wanted to focus on the gurl, her touch, her soft lips, the way her eyes, hidden behind those thick glasses never left his, on the heavy breasts that lifted his balls up. But there was something else pulling his attention away, a pair of massive orange breasts, a wall of tit, headed his way.

Headed his way, FAST.

~

Twin-Twi readjusted Arthur just in time for what felt like a brick wall hitting her massive breasts, tits first, knocking the massive uni-alicorn back a step, her eyes going wide as she found Arthur plummeting from the massive height on the top of her massive tits, nearly 20 feet in the air. His fall was abruptly halted as Twin-Twi’s twin-tits once again met that ‘brick wall’, catching Arthur in her combined cleavage, by the cock!

Twin-Twi gasped as she looked up at the blushing Sunset Shimmer, visible just past the massive cock held in the air between them, and the gigantic tits on Sunset’s side. Those massive unforgiving mass hadn’t been a brick wall, but Sunset Shimmer’s incredibly dense tits. The other gurl was, to Sci-Twi’s quick computations, and Pri-Twi’s matching estimations, 25% taller than the fused gurl.

Sunset’s orange breasts were much larger than that, nearly twice what Twin-Twi shared with herself, and their sudden expansion had been fueled entirely by Arthur’s incredible cum, compared to Twin-Twi that only maybe 20% of her own growth had been.

The difference was dramatic. Sunset Shimmer curled one arm and showed off to all the other gurls, especially for her breast, er, best friends, Twin-Twi. It was gigantic, more muscle in her left arm curl than in Twin-Twi’s combined body. The veins danced and rose across the surface of the arm as Sunset used the last of the cum to push it up even bigger, the massive muscles bulging for the fusion gurl, a deep blush spreading across Sunset’s cheeks and muzzle as she looked at Twin-Twi. “D-do you think I’m big enough?”

“I… There are… No. Words.” Twin-Twi, was breathing hard, panting in passion as she started to reach out to touch those muscles… those tits, but felt a shift in the two heavy balls she had been holding up this whole time just beneath her and Sunset’s tits.

So big, those balls… and growing! The cock was gigantic, and growing as well, rising like a mighty redwood... or library... between their four tits.

Sunset shot her besties a grin and wasted no time. Rocking her tits back and forth and bringing more and pleasure to all three, or four depending on how you were counting, as she ground her tits against Twin-Twi, with a massive cock trapped between them, she smirked around the cock and asked, “How about it, Twi, think you’re gurl enough to keep up?”

A grin that did Rainbow Dash proud spread across Twin-Twi’s face as she gave Arthur’s ball a caress with both her hands, feeling the powerful veins pumping his balls larger. With a glow from her horn, she used her magic to briefly hold him up as she reached out and grasped Shimmer by the wrists, their four tits so large, their muscles so big, that that’s as much of each other’s arms as they could reach. Flexing their muscles, the two gurls pulled each other as close as they could with so much dense tit in the way.

Releasing the magic hold on those heavy balls, Twin-Twi grinned nearly from ear to ear as she had calculated correctly. Balls as big as Luna’s tits might be pulling down, but their four mega tits was enough to hold that cock between them, and Arthur held up, by just tits.

But Twin-Twi knew she needed an edge. Glancing to the right and ready to activate plan ‘Spike, fuck me hard’ she was utterly shocked to see the buff, young dragon stud completely conked out, a dazed and happy expression on his face, tongue lolled out and a thoroughly drained quad balls that dragon’s often sported, and a cock that could choke even a ponygurl flacid and draped over one leg.

Standing next to the knocked-out dragon was Rarity with what was clearly a belly full of dragon cum, her stomach bloated and clearly glowing as if she’d swallowed a few gallons of lava. The pale unicorn moaned as she absorbed the dragon cum, growing larger and taller, ten… then fifteen percent, her breasts surpassing even Fluttershy’s amazing pair. They were easily half again larger than the timid Pegasus gurl’s own set, with smaller nipples than the much larger so oft-milked pair that Fluttershy sported.

Rarity flexed her muscles as her veins glowed with dragon cum power, as her previously full belly had a minute ago, crisscrossing her powerful arms as she reached a point where they could have competed with even the powerfully built Applejack now. Grinning she relaxed, and with a shout gave a hard flex, her muscles expanding enough that the sudden burst was enough that AJ and Dash took two steps back, glancing to each other and realizing Rarity had just surpassed both their muscles combined in one dragon-cum-fueled flex. Finally, her eyes turned a brilliant blue, sapphires, that had Spike still been awake he would have worshiped Rarity for them alone, if not the rest of the new goddess form she had attained.

“Rarity, really?” Applejack caught her breath and with a light grin, lifted an eyebrow, though the scent of her arousal mingled with other mane gurls as they all gazed upon the alabaster unicorn.

“Please, darling, every good fashion designer knows how to give a good blowjob.”

“Yeah, yeah, being good at sucking is great as long as they’re a… Rarity.” Applejack rolled her eyes but grinned at her friend. “I call seconds when he wakes up again.”

“Hey, no way, I want some competitive tits!” Rainbow said, the squabble quickly pulling Twin-Twi attention away from the mane gurls and back to her own compeTITion, with Sunset Shimmer and the cock held between them.

With a gasp, she realized she’d been losing time, and a thick glob of precum was now visible at the tip of Arthur’s mega log, one the Uni-alicorn was quick to use her magic to get ahold of. It was so thick, and reached so deep, that Arthur felt like his entire cock was being fucked from the inside as Twin-Twi with her spiral horns glowing pulled the thick wad of cum up, pulling even more from the boiling tops of his balls and up his cock, the whole thing bulging with the slow passage of cum up and out of his cock until it was all contained in a sphere of purple magic.

With a grin, the uni-alicorn opened her mouth wide and greedily sucked the wad of cum down, and felt her body responding even as she swallowed. “Wow, even human pre-cum is potent!”

Sunset Shimmer couldn’t help but give a quick laugh, but focused on her friend and the effect the pre-cum was having on Twin-Twi. The fused gurl moaned as she slowly grew bigger. It wasn’t the rapid burst of Arthur’s full load, nor the flamey spurt of growth Spike’s Dragon cum had given Rarity, but a quick prelude of what was to cum, her muscles gaining more and more definition, until her arms were the equals to Susnet’s own, a roadmap of veins crisscrossing the powerful bicep. The gurls watching could see how powerful her back was becoming, Pinkie Pie striking a pose for the other gurl’s where they could see her own powerful back, previously the best of the bunch thanks to her big wobbly balloons, and loudly pondered what Twin-Twi would look like with this pose, arms curled above her head.

While Twin-Twi's breasts did grow, Sunset’s were still far in the lead, but finally the two gurls were eye to eye. The two gurls grinned at one another, feeling at once kinship and a competitive desire burning like dragon cum in their belly.

They started grinding their tight, spherical tits together, pushing their sensitive, dense breasts to the limit around the massive cock trapped between them, their muscular arms hanging onto each other desperately.

~

Beneath those four heavy tits were gigantic balls, large enough to make a goddess, or a Princess, blush. They were larger than even Princess Luna’s tits, putting the heavy cum tanks in the same category as Nightmare’s Moons. Arthur groaned, feeling trapped. Above were tits, bellow were his massive balls, between it all was his cock trapped between four of the most majestic under-boobs he had ever beheld. The pair of purple and orange tits ground together around his cock so fiercely he half expected to look up and instead see a purple and orange swirl of veiny tits, but he was just happy to hug, and kiss, and caress as much as he could reach.

Twin-Twi’s tits felt like velvet wrapped over steal, and he couldn’t help but grip the pumping veins and lick everything he could reach. He could feel Twi shiver with every touch, her skin moving as the four giant tits ground his cock, and her moan was so deep, so warm, that he felt it like a small earthquake through her tits. He echoed her with a moan of his own as his balls began to boil. He was at his limit and knew it, but didn’t know which gurl was going to get what felt like over 300 gallons of cums.

~

Sunset Shimmer was busy trembling her way through an orgasm. While she wouldn’t have traded her years at Equestria College for anything, she’d missed having her poni-gurl body and just how orgasmic it was capable of being. The last time she’d felt this much pleasure had been back in the other world at one of Pinkie’s sleepovers. That one right after Sci-Twi had joined their group permanently, and Pinkie and Rainbow had convinced the newbie that a daisy chain was a must have at any all gurl sleepover. They’d taken turns chaining together until each one of them had been licked to orgasm by every other gurl, and also licked every gurl to a thigh clenching, tit grabbing, ass spanking, orgasm.

But this was just tits. Just Twin-Twi, the biggest and bustiest gurl Sunset had ever seen outside of herself, so big, so majestic, so using her magic to…

To…

Sunset snapped back to full awareness, clomping up from her tit-gasmic induced stupor to see that Arthur was cumming, and cumming, and cumming! Twin-Twi had used her magic to pull his cock through their four smished tits to bury it fully in her own purple cleavage, her mouth now firmly around that bulging, pumping, cum blowing cock!

That greedy, cum guzzling, bitch!

Sunset was just too stunned by the cum-theft, the cock theft, and wanted desperately to yank that massive redwood of dick back through the feet upon feet of purple and orange cleavage so that she got her share too. Instead, she found herself leaning forward, using her magic to push the cock even more towards Twin-Twi, to squeeze her friend’s massive boobs even tighter around Arthur’s cock, and letting go of Twin-Twi’s powerful arms so she could start massaging both those massive balls with her powerful hands.

And what balls they were! She gave an involuntary gasp and took a step back, admiring the massive balls, fingers stroking across the veins before grasping with both hand and giving them a SQUEEZE.

More than a few boyfriends in her darker days had not enjoyed her squeeze, but some part of her knew that not only would Arthur love feeling her work her big, strong muscles and her hands all over his overladen balls, stroking, squeezing, and pushing more cum directly up through his cock and into Twin-Twi’s surprised mouth, he’d be begging for more.

Sunset couldn’t help but give a little laugh as Twin-Twi’s eyes bulged open as big and wide as the rims of her glasses, glasses that had slipped down her purple muzzle. What had been a fountain, became a geyser of cum, all pushing into Twin-Twi’s mouth at once, and Sunset wasn’t going to let the purple princess drip a drop of the well cultivated cum.

~

Twin-Twi moaned and reached down, partly to feel a stomach that Sci-Twi had to be mentally reminded by her Pri-Twi half wasn’t contained under those sexy abs, but in a lower, larger space inside their poni-gurl lower half. Unable to reach it easily, Twin-Twi’s hands fell upon Arthur’s incredible balls. Her fingers traced along the sides, and Sci-Twi ran a quick calculation. When this began, his balls contained approximately 357 gallons of cum. To which the Pri-Twi part of their brain gleefully added, and all of it is going inside this hungry belly!

She couldn’t help but give those massive balls a squeeze from her side.

~

Arthur on the other hand was losing his mind. Four powerful hands were caressing his balls, squeezing him from four separate angles, massive muscles flexing and pushing, forcing his boiling, cum filled balls to push more and more cum up through his cock, pulsing between Twin-Twi’s Tits, and deeper into Twilight’s stomach. He could hear her swallowing, and knew his cum was passing through her long throat as she gulped the gallons of cum.

And more than that, Arthur could hear a sloshing sound… from inside those heavy, purple underboobs he was so desperately clinging to. He was hearing… he could smell… MILK.

~

Sunset watched in awe, still caressing and squeezing Arthur’s balls, but she was in utter shock at just how much her bestie was able to handle. Was Twin-Twi intending to drink it all? Could she? Sunset had been at her limit before! Could her best friend x2 really handle it all? Sunset could already tell the Brainiac intended to try. Did Sunset dare try and stop her? She wanted some of the cum for herself… but to see Twilight get as big as she could... It was just too tempting!

As she watched in indecision, Sunset’s jaw swung open… Twin-Twi was… her belly looked pregnant with a whole herd of muscular poni-gurls! And Twin-Twi wasn’t even half done with those big, cum filled balls!

With a deep breath, Sunset knelt down, moving to her incredible knees and let those heavy balls rest on her tits, still holding them in place with her powerful hands. Arthur’s huge balls were now between her tits and Twilight’s, part of her delighted that her own massive pair was still bigger than her best friend’s, even if one of the purple princess’s arms was enough to lift Sunset in her entirety. Giving one of Twilight’s breasts a kiss, she flexed her abs and did something she really hoped wasn’t going too far.

She stood UP.

The result was that her breasts squeezed those mega balls between her own firm, fit breasts, and Twilight’s pair, turning a guyser of cum into a near explosion. Arthur cried out at the sudden increase of pressure, being stuck as the meat in a tit sandwich between so much gurl. Sunset let go of Arthur’s balls, knowing they were well and truly trapped between her tits and Twi’s, and instead moved her hands up to caress Twilight’s vein covered tits, tracing each one with a finger, until they all inevitably met at her nipples, which she gave a sharp tweak, even as she increased the pressure on those heavy balls, by decreasing the space between the two bestie’s tits.

Then, a new surprise happened, from Twilight’s nipples… in two sexy fountains… was milk.

Delicious, wonderful smelling… milk! Sunset couldn’t help herself but dive face first against Twilight’s right tit and began sucking as much sweet gurl goodness as she could. A part of her mind became aware even as she lost herself in that delightful, wonderful milk from her bestie, that something very important was being said behind her.

It was Pinkie commenting that she had a twitchy tail.

That’s when she heard the massive pair of impacts behind her.