Hot Swap

It was just after noon when Applebloom made it to the old clubhouse. Shockingly her run from town was in record time. She didn’t even have to stop for a breather! Although she did have to stop to stuff her package back into her tiny shorts. The sensation of them flopping and undulating with every step had turned out to be more painful than she imagined and awkwardly had to place her hand on them to keep things steady during the run. Has anyone invented a sports bra for stallion junk yet?

Applebloom carefully climbed up the wooden steps. With how today's luck was going her meatier hoof would break through the boards before she even got to her potions book. Ducking to fit inside she squeezed her broadened shoulders and saw a mare sitting against the far wall with her legs crossed.

“S'cuse me this is a private clubho- Rumble!?” said Applebloom with shock.

Rumble nodded, stiffening up. “I just realized that we might have switched potions yesterday,” he said, in a much airier, higher pitched girly voice.

“Just...uh. Wow. Ah didn’t even recognize ya,” Applebloom gawked at Rumbles new body. Long mane and tail, big full lips in an adorable pout, large pretty purple eye with thick lashes, thick thighs and thick legs, cute face with a small chin framed by his dark locks, and the chest on him looked bigger than anyone she’d ever seen before. Those fat breasts bulged obscenely from his shirt and it looked like their size broke 4 or 5 buttons. The canyon of cleavage on display was nothing short of pornographic and only the very top and a few bottom buttons held the line from nudity. Not that the white, sweat soaked shirt didn’t reveal wide dark areola or plumped up nipples poking through the fabric.

“OKAY! I get it. I’ve got big tits,” Rumble snapped and folded his arms, startling Applebloom.

“Uhh, sorry. Ah didn’t realize ah was staring but ya can’t really blame me,” retorted Applebloom. “Both of us went through some pretty dramatic changes today.”

Rumble sighed, getting to his hooves. “I wasn’t trying to be a jerk but I feel really… emotional right now? Like before you got here I was really mad then I started crying and then I was mad at myself for crying about this because I was reading your potions book and saw the antidote mixture-”

“Oh! Great!" Applebloom finally squeezed into the clubhouse door only to bang her head on the ceiling.

“OW!” she fell to her to her knees and rubbed her head. The ceiling used to be just tall enough that her bow would lightly graze the wood. “Ah shoulda thought about that.”

Rumble walked over and stood in front of Applebloom with his hands on his hips.

“Well, either you're the worst potion brewer in history or it looks like we drank the wrong potions,” said Rumble wearily, eyeing Applebloom’s impressive male physique. “I’m going to partly blame your sister for this mess because she’s the one who distracted us right before we drank.”

“Uh-huh,” replied Applebloom, still on her knees. At their current heights and positions Applebloom’s was eye level with Rumbles impressive new cleavage. “Welp, y’all got my dream body Rumble. How’s it feel?”

Feel for yourself crossed Rumbles mind and he bit his lip. Did he really just think that?

"Feels small, soft and wet,” he said, eyes wandering to Applebloom’s impressive traps and arms, to her big, meaty pecs and further down… “and yours?”

“Big, strong, hard a lil’ cumbersome I got to say,” Applebloom sniffed the air not too subtly. “Y’all smell really good by the way.”

“You too,” blurted Rumble, blushing madly. Why was he blushing now? And his heart was racing. It wasn’t untrue. The musky scent of sweaty hunky stallion was wafting under his nose and starting to invade his thought processes.

“We should uh, whip up this antidote,” Rumble said with a nervous grin, his face hot as he twirled a long lock of his dark mane. Stop blushing dammit!

“Let’s do this!” Applebloom loudly clapped her hands and shuffled over to the bench. Luckily there was a worn carpet on the floor that prevented any splinters.

“It’s a good thing I thought to gather up all the antidote ingredients yesterday, right Rumble?” said Applebloom shakily, trying to whip up any kind of conversation after a long stifled silence.

“Yeah,” Rumble swallowed, wiping his forehead where sweat was already beading. “It was.”

Applebloom awkwardly continued assembling the potion in one of the larger beakers she had on the desk. It was a bit more difficult than yesterday due to her bigger hands making the fine adjustments sloppier than they should be. Thankfully Rumble was there to offer assistance with some of the more delicate procedures with his smaller, narrower fingers. He held the smaller test tubes and went about pouring in pinches of powdered ingredients at Applebloom's direction.

The small room was rapidly heating up. The midday sun was hot and in under 10 minutes they were both dripping with sweat. With no ventilation or air flow the only things swimming around the hot room was the heat and combined musks. It was so muggy in the clubhouse that the windows were fogging up. The two were practically inundated with the heady aromatic mixture they’ve naturally created.

“Jeez, Rumble,” Applebloom practically panted, wiping her forehead for the third time in a minute. “Why did y’all close ALL the windows? I’m dyin’ in here.”

Rumble spread his wings and slowly flapped to provide some airflow. “I locked the windows in case any unexpected guests would pop in here.”

“Sure.. I guess,” Applebloom corked two of the crushed mayflower seeds mixed with spring water and shook the vial. Out of the corner of her eye she watched the rise and fall of that over-large bosom with each gentle flap. Every smooth wing motion seemed to stretch and release the tension on Rumbles chest. It looked like the sweat-soaked fabric was ready to give.

A familiar heat crawled through her body and Applebloom felt her cock starting to stiffen. Feigning a cough she inched herself closer to the desk to obscure her encased crotch.

“Alright, nearly done. Next ah need to grind these leaves into a fine, watery paste,” Applebloom dragged her finger across the line to ensure she got it right. “Rumble can y’all grab me the mortar and pestle from the trunk across the room?”

“Sure,” said Rumble, rising shakily up. Applebloom watched the wiggle of his hips and sway of his fat ass packed into those tiny tiny jeans shorts. It was almost hypnotic and Applebloom felt her cock plumping painfully in her spats. She reached down and gingerly slid it out and aimed it through one of her pants legs. In her haste the fabric tore but at least her growing cock had room to breathe…

Rumble opened the lid and sighed cutely at the mess. “What does a mortar and pestle look like?” he asked, looking over his shoulder.

“Like uhhh, bowl with a stone thingy in it,” replied Applebloom, one hand fondling her ball-sack.

Rumble sighed again and flipped his sweaty mane around. “Is it heavy?”

“Yeah…”

“Then it’s probably at the bottom of the trunk,” he replied, bending forwards to reach into the mess of equipment.

RIIIIIIIIIIIIIIP

Instantly the thing tears that had formed earlier in class around his growing assets tore wide open in this bent over position, revealing oodles of thick, grey thighs and rump. Bared right at the big hunky stallion watching behind him. Rumble eeped and instinctively covered his ass, wings flaring out in surprise as he stood up and arched his back to look behind him.

Applebloom stared harder than daggers but turned away. The image of that fat ass almost bursting through those pants was so painfully erotic that her erection throbbed. Precum was streaming from her tip like a faucet.

“Just, ignore that, please,” Rumble was beet red and carefully walking back to the desk. He settled down next to Applebloom. Rumble was keenly aware of her powerful arousal. Every minute or so his pussy would flex lewdly and send small lashes of pleasure through his body. The last time he actually heard it too.

Rumbles sweat soaked shirt was doing nothing at this point other than to hold his mammoth breasts in place. It was like he’d had a bucket of water dumped on him and sweat was rolling down the expanse of cleavage on display.

“Can y’all hold the bowl steady?” Applebloom asked, placing all the leaves inside.

Rumble inched closer until their legs were almost touching. He held the bowl tight with his dainty hands. “Okay, got it.”

“Thanks,” grunted Applebloom, placing the pestle into the bowl with her left hand. At the moment her fully erect cock was pressing against the wooden bottom of the desk and the last thing that needed was a splinter. So Applebloom grabbed her sticky shaft by the medial ring with her right hand and held it down a bit. The warm flesh throbbed happily against her palm.

“So uh… when ah… changed,” Applebloom said, while grinding the leaves into paste. “Ah managed to uh, sneak into a restroom an’ hide.”

Rumble was watching the muscles flexing in Appleblooms arms during the mortar process. “Uh-huh.”

“Ah don’t think ah got caught. Scoots and Sweetie didn’t seem to notice,” she continued, trying to not stare at Rumbles enticing cleavage. “Almost did. Lucked out… did you get caught when you swapped?”

Rumble gulped and then sighed cutely, eye fluttering to look away.

Good lord that’s so fucking cute.

“Yeah…”

Applebloom paused, her boner twitching in her hand. “Who caught ya?”

“I know Pip did for sure but that’s it,” Rumble looked up at AB with his big violet eyes. “I really hope he keeps his mouth shut.”

“Me too,” Applebloom thought back to the toilet she’d cum-clogged earlier in the day. “Any idea what set off the potion?”

“Cheerilee,” Rumble replied, his chest starting to rise and fall quicker. "That's what it feels like."

That piqued Applebloom’s interest. “How so?”

“I don’t want to say,” Rumble sighed, shirt straining dangerously at the last two buttons.

“C’mon, she say or do something? This could help figure out what makes this potion tick!”

“Okay… I was sitting there listening to class and I was feeling… horny and bored and I started thinking about Cheerilee. I was picturing myself having sex with her.”

Applebloom felt her cock jump. “Go on…”

“Me, having sex with her on the desk, pounding her in the ass and slapping her rump and stuff,” Rumble extrapolated, "and that’s when the first changes started.

“So then my… ass and breasts started growing,” Rumble continued and tapped the top of his chest, causing the weighty mass to jiggle tremendously. “And I was focusing on that at first but…”

“But…?” Applebloom licked her lips, feeling a powerful warmth spreading through her body. It felt like her cock was swelling in her grip. Or was it just her imagination?

“Halfway through before I got like this I started fantasizing like… Cheerilee was sprawled on her desk getting rutted… but instead of me giving it to her from behind I was next to her on the desk getting fucked from behind with her, and me and her were playing with each others breasts,” Rumble concluded shakily.

THUNK THUNK

Rumble took a surprised step back at the noise only to trip on his much longer tail, tumbling to the floor with a light thud. Immediately Rumble gasped and snapped his head to the door, chest heaving.

“Rumble!” Applebloom swiveled around. “Are you alright?”

“Uhh?” Rumble panted heavily in fear of being caught. “What do we do?” he hissed, still staring at the door.

Applebloom stared hard at Rumble, reclining back on the floor propped up on his elbows in the sexiest accidental pose ever seen on this planet.

“That wasn’t the door Rumble that was me hitting the desk… yer little story got me… excited.”

Rumble looked over at Applebloom and finally saw it. The foot long cock sticking out from her body. Long, thick, veins pumping up the length of the shaft and drooling pre-cum down the length of the shaft and onto the floor. As if it were responding to attention the rigid pole jerked and a stream of clear fluid splattered onto the floorboards.

Rumble shivered and groaned at the sight of it. This powerful male body only feet away reeking with musk and virility. An immense surge of arousal wracked Rumbles body-

POP POP

Causing the last two bottom buttons holding his shirt together to give up the ghost. Both bulging breasts popped out into the open, shuddering on his chest as they rapidly grew in size. Rumble trembled through the sensation and pitifully reached up to cover himself. His tiny hand covered up a laughably small portion of just his fattened nipple while the breast-flesh swelled and ballooned ever larger. Their cup sizes climbed the alphabet to G, then H and I, until finally around a J cup the pins and needle sensation of growth ceased.

Rumble fondled his bare, upper body and hefted his one tit, admiring the size and new weight before letting it go to fall back down to his chest with a wet SLAP

“Rumble,” began Applebloom softly.

“Yeah?”

“Do you want to have sex right here, right now?” Applebloom blurted out as directly as possible.

The question of sex hung in the hot air of the clubhouse: a bombshell that was swiftly dropping.

“...fuck me,” Rumble finally said.

Applebloom tore the useless shorts she had on off like tissue paper and approached Rumble, who carefully rolled over to get on his hands and knees. Thrusting his fattened ass out at Applebloom spread the rips in the fabric even wider. Not seeing any more use for clothes she grabbed the fabric and ripped the tattered jeans off Rumbles body.

Rumble squealed at Appleblooms touch and flagged his long tail to the side. Without any fanfare she lined up her cock with his winking hole and thrust inside.

It was heaven. Warm, wet, and ungodly tiiight. Applebloom managed to shove the entire length of her cock inside with one strong roll of her hips. Almost immediately she felt Rumbles tunnel pulse and give her entire shaft a rippling squeeze around the meaty length drawing a guttural moan of pleasure from the large stallion. Applebloom placed her big hands on Rumbles hips like it were the most natural thing of her life and pulled out to the tip, before thrusting in again.

Rumble’s body felt electrified. Every touch on his diminutive sexy body sent lashes of pleasure that lingered and built in his brain. The marathon of thoughts, concerns and grievances that led to this moment evaporated the instant Applebloom’s plump cock plunged into Rumbles soaking wet pussy. Penetration like this was completely alien feeling but now to experience it was a kind of nirvana that wasn’t even comparable. Rumble could feel every bulging vein traveling up that shaft. The feel of that cock throbbing when slammed back in. An orgasm was building within him the second they started fucking and now it was reaching its crescendo. Rumbles mind blanched and his body spasmed as a powerful orgasm wracked his little body.

Applebloom groaned loudly as Rumbles cunt rippled and flexed around her thick cock. It was rhythmically pumping her shaft, desperate to coax the seed out and into his new womb. The room was practically a sauna at this point and the heat was almost unbearable. Applebloom sucked in the delicious ambrosia of their combined scents like it were perfume. It only fueled her erratic unfocused thrusting further.

After Rumbles fourth straight orgasm Applebloom hit the brink. She felt her big body tense and balls clench. Her cock became harder still and the tip flared, plugging itself deep in Rumbles thick, mewling body. A tiny voice in the back of her head was scolding her to pull out now but the roaring incoming orgasm drowned it out. Applebloom’s shaft surged and unloaded pints of warm hot cum into Rumbles eager pussy.

“Ah,AH, AH!” Rumble panted at each pulse of semen surged down that turgid shaft. He could feel it in his core. The hot juicy loads of jizz painting his insides white with every concurrent surge. Rumble threw his head back and came again, massaging his pendulous tits in pure ecstasy at being bred by this huge fertile male.

Applebloom’s orgasm continued, just going on and on and on. More and more jizz pouring through by the second. It felt like before in the bathroom but a million times better!

Applebloom felt her hair brush against the ceiling

“Uhn, fuck!” she grunted, glancing up as her body surged in growth, cheek hitting the ceiling. She was growing again! The inches flew by as her body swelled, muscles bulged out and increasingly less space became available for Applebloom to fuck Rumble comfortably. When she hit seven feet, instead of crouching she simply fell forwards and braced her powerful arms against the floor, rolling her hips in tune with the orgasm.

Plus her cock was growing too.

Every spurt added a new inch or so to the length of the already thick foot long cock planted in Rumbles spasming pussy, as well as its girth. Rumble squealed and jabbered incomprehensibly as his already overstuffed pussy stretched around the size of the rigid invader spewing its payload deep into her womb and the powerful sensation drove him over the edge a fifth time, the added lubrication of his juices letting Applebloom thrust in and out with more ease even as her cock doubled in size.

Finally, after what seemed like an eternal flow of jizz, Applebloom pulled her cock out of Rumbles hole. It reflexively jerked and spewed one more rope of jizz once the tip was out, marking Rumbles grey wing-feathers and fat ass with a stripe of white. In the hot, dark confines of the small room there was steam coming off the turgid flesh of Applebloom’s cock. She squeezed her softening shaft and caressed her fattened nuts with pride at the sight of her handiwork: a panting, satisfied, fertile mare successfully seeded with her cum.

Applebloom snorted and eased herself down next to Rumble and sighed happily, arms spread wide on the floor. After about thirty seconds of laying in the aftershock of such powerful sex Rumble also joined Applebloom, sidling up next to her and resting his head in the crook of her arm.

“Wow…” Rumble said dreamily. “That was… the most… amazing thing I ever felt in my life.”

“Tell me about it,” Applebloom said, pulling Rumble closer so he could rest his head on her chest. She unconsciously reached down to cup Rumbles fat ass, “ah kinda… wow. What do we even talk about now?”

“My heart feels like it’s going to explode,” Rumble nuzzled his head against her beefy pectoral. “How do you feel?”

Applebloom’s eyes felt heavy. “Like ah wanna take a nap after that,” she slid her hand up to play with one of Rumbles fattened breasts. It was warm and heavy; Rumble coo’d as she played with the erect nipple.

“I think we could go for a nap,” Rumble yawned slightly, "and then we can drink that potion thing."

Applebloom shut her eyes and smiled.

"Ah couldn't agree more."