All Grown Up

Applebloom awoke to the sound of splintering wood. Her eyes fluttered open woozily, then snapped open when something cracked beneath her.

She jumped to her feet—and smacked her head right on the ceiling. “Ow!” she yelped. Her forehead throbbed with pain. Holding a palm to her throbbing temple and slouching slightly, she glared up at the place where she’d hit the ceiling.

Then she realized: she’d cracked the ceiling. Just by standing up. Her heart beat a little faster in her chest, and she carefully pulled herself back up to her full height. One inch, two inches, three—and then the back of her head bumped up against the splintered plaster. She was almost, but not quite, standing at her full height.

A grin spread across Applebloom’s face. The ceiling of her room was almost exactly eight feet tall. She’d gone to bed at six feet, nine inches (she thought; in reality; she’d grown to seven foot two by the end of the day, but she didn’t know that), and had woken up more than a foot taller. Just by the amount she still had to slouch, she estimated her height at around eight foot two, eight foot three.

Applejack was “only” eight foot five. Bloom’s grin widened.

That was when she felt something warm sloshing around her feet. She glanced down and paled. A small sea of whitish, swirling liquid had filled her room. It came up to just under her ankles, and—her nose wrinkled—was extremely musky. Then she noted her dangling stallionhood, and noted the steady trickle of pre leaking from its tip.

She abruptly noticed that her big, fat balls felt extremely overfilled. Applebloom almost groaned aloud. Was she going to need to empty these things that regularly, for fear of...well, this? She swirled her toes around in her ocean of pre, then actually groaned when she realized that she’d have to clean it up.

Getting on the clothes that Applejack had lent her yesterday proved to be an impossibility. They’d been tight when she’d gone to sleep, and were just too darn small today. So, after opening her bedroom door—and letting a small wave of pre flood out into the hall—and checking that the coast was clear, she clutched her hands to her chest and went creeping down to Applejack’s room.

If she’d thought that the corridor had felt tight yesterday, it was nothing compared to the volume she took up today. Her broad shoulders had difficulty fitting through her own bedroom door—though not Applejack’s resized one—and the tips of her ears wouldn’t stop brushing up against the ceiling. Still, once she’d checked AJ’s closet, she managed to snag a few working clothes and clean herself off with a half-dozen towels before slipping them on.

She made her way back to the kitchen, excited and slightly apprehensive at seeing how she measured up to Applejack now. But her big sister wasn’t there. Instead, Macintosh was at the sink, washing the dishes. He turned around to greet her when she entered, and then froze with his mouth hanging open as he looked up to her...and up and up and up.

“Hiya, Mac,” Applebloom said. For some reason, her brain just automatically omitted the word “Big.” “D’you know where Applejack is?”

“Uh.” Big Mac wet his lips, still trying to register his “baby” sister’s even larger size. He prayed that she wouldn’t notice his trembling hands...or the growing tightness at his crotch. He couldn’t help it. To see his littlest sister like this was nothing short of terrifying.

She looked incredible, sure. But where he’d had to look up to meet her eyes before, now he actually had to crane his neck back to see past her enormous, firm breasts. His head didn’t even come up to her shoulder anymore, and each one of her biceps looked almost as thick around as his waist. Big Mac swallowed, his eyes drifting slightly down to the massive, hanging pouch that “concealed” his little sister’s enormous bulge. Oh, Celestia. Just one of her nuts had to be the size of his entire package from the looks of it.

“Uh,” he said again. He gulped and steadied himself. “She’s, uh, out in the yard. Cuttin’ firewood.”

Applebloom’s face lit up. “Thanks!” she said. Then, in two long strides, she made her way across the entire length of the kitchen and swept Mac up in a bear hug.

She actually lifted him a good foot off the ground, crushing his smaller body against her twin mounds and weighty bulge. Finally, after what seemed like an eternity, she let him drop to the ground, his chest heaving.

With the floor shaking beneath her, Applebloom made her way out of the kitchen and into the yard.

She squinted, raising her hand over her eyes to filter out the bright morning sun. Once she’d adjusted, she stepped down the porch, the wooden steps creaking beneath her every footfall. She heard a mighty grunt coming from around the side of the house and brightened. As she walked, her massive package swayed from side to side, slapping against either one of her tree-trunk thick, muscular thighs.

She found Applejack by the barn. Her older sister had an axe in her hands over half as tall as she was. She was using it to split entire tree trunks, her thick, corded arms driving the axe through the wood and splintering it as easily as though she’d been breaking a twig. For a few moments, Applebloom watched her sister work. Drops of sweat ran down her neck into the cleavage of her bust. Every inch of her enormous body seemed to quiver with tension, a thin sheen of sweat covering each ripple and bulge of muscle. Applebloom licked her lips, one hand slowly rubbing against the tip of her chubbing-up shaft.

Thankfully, before her boner reached full mast, Applejack caught eye of her. “Hey! AB!” she hollered, setting the axe down and waving. She stepped one foot onto the trunk she’d been splitting and leaned her elbow on it, a motion that just happened to push her enormous bust a few inches further forward. There was a big grin on her face—a grin which turned to a look of amazement as she took in all of Applebloom’s new size. “Wowzers! You sure got bigger.”

Applebloom’s hand fell away from her crotch with an almost guilty twitch. “Oh,” she said, her cheeks flushing. She’d strutted out here all proud and cocksure, but now she couldn’t help but feel self-conscious beneath the weight of Applejack’s gaze. “I guess so.” She was suddenly extremely aware of her breasts straining against her suspenders; of the massive, protruding bulge in her shorts; and of her hard, erect nipples that, even in her larger, fitting clothes, had to be impossible to miss. “I mean, maybe a little.”

“A little!” Applejack came striding up to her, her own long, muscular legs taking her there in a heartbeat. She eyed Applebloom up and down with what Bloom hoped was approval. She laid a hand on Applebloom’s upper arm and felt it, a smile playing upon her face. Her fingers didn’t even reach halfway around her little sister’s thick, corded muscle.

“Well, shucks,” Applejack finally said. Applebloom was glad she’d spoken; sweat had begun to bead on her forehead, and she’d felt her stallionhood beginning to chub up again. “You’re growin’ even quicker than I did!” Her hand moved up to Applebloom’s shoulder and gave it a light squeeze. “Gosh. And this is only your second day? You’re sproutin’ up like a weed!”

Her sister’s smile lit a little warm flame in her chest. Applebloom smiled back, savoring the fact that she only had to glance up a bit to meet her sister in the eye. “Yeah,” she said. “It’s pretty great.”

“I’ll say,” Applejack breathed. Neither of them noticed, but Applebloom had been steadily growing the whole time they’d been talking. By now, they were almost eye to eye. Applejack gestured to her little sister’s bust and grinned awkwardly. “May I?”

Applebloom blinked, then blushed furiously. “Oh!” she said. “I, uh, I guess so.”

Applejack nodded happily. Her big fingers slid down Applejack’s bust, the firm, muscular flesh depressing softly beneath her touch. “Gosh,” she said again, eyes wide. “Looks like you hit the jackpot. These knockers have gotta be a good two bigger wider than mine.” She hefted one with one of her massive hands, then brightened. “Heavier, too!

“Aw, shucks,” she added, once she saw the rosy red on Applebloom’s cheeks. “These’re things to be proud of, sugarcube!”

“I know,” Bloom said. “It just...feels real nice hearin’ you say ‘em, is all.”

“Well,” Applejack said, giving her sister’s arm a squeeze. “Why don’t you and I head to the barn so I can tell you all about your new body?”

Applebloom’s eyes lit up. “Oh, yes please!”

The two almost equally huge mares made their way into the barn—for once, Applebloom noted with a smirk, not having to duck to enter through a door. Applejack seated them on two big haybales each, right next to each other, and settled back in her seat.

“It’s a mighty big change, I’ll admit,” she said. “Wakin’ up one mornin’, seeming larger than life. I know I was shocked.” She chuckled. “‘Lil’ Mac sure was.”

“Little...Mac?” Applebloom asked.

“Sure,” Applejack said. “Can’t go ‘round calling him Big Mac anymore, right? Not compared to us—and especially your kinda growin’ filly.” She grinned. “Course, we still call him that in public, but when it’s just us, the curtain falls down.

“Truth be told,” she said, “I think he kinda likes it. After lookin’ down on most everypony else, he likes lookin’ up to somepony. And now, two someponies,” she added, “even if they are his ‘little’ sisters. Plus, it helps havin’ someone who can finally fill him up right.” She patted the massive bulge-pouch laying on her lap and winked.

Applebloom stared, uncomprehending for a moment, and then gasped. The blush returned, fiercer than ever. “No way!”

“You betcha,” Applejack said, grinning. “Loves feelin’ like the little filly he is.” She rubbed her big bulge with one enormous hand, flexed her waist-thick arm behind the other. She gave her ‘little’ sister—though that was fast becoming a symbolic term, with Applebloom steadily, but invisibly growing since she’d stepped out of the house—a wider smile and flexed even harder. “Compared to us, he’s as small as everypony else is to him. Smaller, even.”

She raised her eyebrows, and let her hand wander over to Applebloom’s lap. Applebloom shivered as her sister gave her thick, muscular thigh a squeeze. When Applejack’s fingers first brushed against her own massive bulge, a tingle leapt up her spine. Slowly but surely, Applebloom felt the weight increasing at her crotch, her previously inert member hardening. It was throbbing, pulsing with her heartbeat; her balls were getting heavier, filling up with cum as her sister’s skillful fingers massaged her enormous package.

“A-applejack,” Applebloom gasped. “Ain’t we—a-ah!” She moaned, low and throaty, as Applejack’s fingers hit a particularly sensitive spot. Her near-full erection sprang free of its fabric prison at the same time that her shaft lurched, giving off an explosive shot of precum. Applebloom drew in a shuddering gasp, her whole body shaking as the air was filled with the sound of tearing fibers and cloth.

Applejack watched with wide eyes and approval as her ‘little’ sister’s title became in name only. Applebloom kept moaning as her body swelled, her invisible growth finally becoming apparent—and speeding up. Her head crept up higher into the air—two, three, four inches and beyond—as her cock tore its way out of her pants and panties alike. Her muscles thickened; as she twitched with pleasure, her growing biceps tore their way out of her sleeves, her enormous, corded muscle flexing and swelling reflexively.

When she finally came out of it, she was sitting, stunned, on the bale of hay. Her long legs were spread out before her, making way for her beach-ball sized nuts. Her three-and-a-half-foot shaft bobbed before her, gently pressing against her enormous breasts. Her bust, too, had swelled into two enormous pillows that reached all the way down to her lap, and had enveloped her cock in such a way that every breath thrust it further inside of her vast cleavage. She panted, almost choking on the pleasure as a steady river of pre dripped from her marecock.

She gasped again when she felt a squeeze on the underside of her breasts. Turning, Applebloom saw her sister looking at her—looking up at her. Somewhat unsteadily, she ran a quick calculation: If Applejack was eight foot five (she didn’t think she’d grown since she’d been measured last), and her eyes only came up to Applebloom’s nose, that meant that Applebloom herself had to be a good nine feet in height!

The realization turned her on like no other. She felt her cock throbbing, groaned as she felt her breasts sagging around it, ripe and full and so pleasingly large...just like she was.

Applejack stared. Applebloom thought she saw her drooling a little. Her pupils were dilated.

“Oooh, gods.” Applebloom moaned and flexed her arm, the rags of her former clothing just exploding off her massive frame. That arm had to be a good sixty or seventy inches around. Engorged veins snaked around it, all but exploding with power. She could feel her enormous lats and traps pumping behind her with every breath she took, her shoulders spreading out broader and broader by the second. “Applejack, I’m so big.”

Applejack sucked in a breath. “That y’are, AB.” Her voice sounded unsteady. Trembling slightly, she flexed her arm and made a bicep of her own. It just barely reached three-fourths of Applebloom’s size. By now, her own erection was throbbing noticeably—having been managed by a mare with slightly more experience, it had pushed past Applejack’s wide-set hips and into the air instead of exploding out of her clothes. It throbbed steadily, drooling pre. It was a full six inches shorter than Applebloom’s massive stallionhood.

“Ooh,” Applebloom moaned again. She dropped her arm and massaged her aching balls. They were so massive that they forced her legs apart by a good six inches; had she been forced to walk, they either would have had to stay in front of her or force her to waddle around them in an incredibly awkward gait. She gave one a little squeeze and groaned even louder as a few ropes of spooge, each one larger than a normal stallion’s entire orgasm, spurted from her tip. “They’re so...full.”

Applejack licked her lips. “Well,” she said, her voice shaky. She hadn’t expected Applebloom to grow up quite this fast—or quite so much. “Maybe I can...help you.”

“Ooh...yes, please.” Applebloom was twitching, her cock shuddering and lurching with the gallons of unspent spooge it was keeping back.

Still trembling, Applejack drew her massive, yet smaller frame up from her haybale. She undid her buttons and let her pants and shirt fall to the ground. Then, she placed both her hands on Applebloom’s shoulders and sat down in her sister’s lap, legs set apart and face-forward. Their cocks rubbed together, too big and thick to do anything else. Their nipples, each one damp and stiff with arousal, did the same. Both examples of Applebloom’s equipment were a good amount larger than Applejack’s, and the older sister had a feeling that they’d be getting even bigger.

Letting their cocks and breasts squish together, Applejack leaned into her sister and over her massive bust. Their lips met, Applebloom’s tongue curious, but powerful as Applejack’s mashed against hers. They groaned together, their squirming and lustful humps pushing their cocks and breasts even more firmly together. The two frotting stallionhoods began to leak and throb even harder, swelling up with size and arousal.

Applejack pulled away with a moan. “You’re so big, lil’ sister,” she gasped. “Oh, gods.”

Applebloom was gasping too, her breaths ragged and heavy. “They’re so full,” she whimpered. Applejack could feel her sister’s titanic nuts throbbing against her own, churning and sloshing with unspent seed. “Oh, Applejack, they’re so full.”

“Hush,” Applejack said. “We’ll get you nice and empty.” She gave her sister another peck on the lips, and then leaned back until Applebloom was sitting straight up. Getting onto her feet, she wasted little time before heaving herself up to the bale of hay right beside her larger sister.

“Now just you hold still,” Applebloom said. “I’m just gonna get in position, and I don’t want you movin’ none. You hear?” Applebloom nodded, the incredible pressure in her nuts more than enough to keep her from talking back.

Applejack eyed the enormous stallionhood in front of her, running calculations in her head. It came up to just under Applebloom’s chin, and would definitely be a mighty tough rutting. Her jaw set. But she’d do it, damnit. She was an Apple, and no Apple ever left a family member in need.

And besides, she’d never had something fill her up quite so much before. Lil’ Mac and his paltry two-footer didn’t even come close to satisfying her anymore. With a grunt, Applejack steadied her nerves and swung her leg over Applebloom’s lap. She came down with her marehood poised directly over her sister’s throbbing cockhead—and let herself crash down.

Applebloom gasped. It felt like all of the blood in her body was rushing to her shaft as it hardened beyond anything else she’d ever felt before. The snugness, the tightness of Applejack’s pussy was almost too much to bear. But bear it she did, gritting her teeth and grunting as her sister plunged down a good two feet down her shaft.

“Whoa, there,” Applejack hissed. She was squinting, holding one hand over her belly. Her own cock was throbbing and flaring madly in front of her, her breasts bouncing against her chest from the impact. “Take it slow.” It was the first push, and she’d already reached the medial ring. It was a good start, but not good enough. Grunting, groaning, she forced herself to take a few more inches of Applebloom’s long, fat cock.

Applebloom was panting as pleasure threatened to overwhelm her. At first she didn’t know what to do—she wasn’t a virgin, not really, but this was a whole new position that she didn’t know what to do with. Finally, she settled on slapping her big, meaty hands around Applejack’s waist and squeezing. Her elbows had the side effect of lifting her barrel-sized jugs into the air, providing a comfortable, yet firm surface for Applejack to lean against as she impaled herself on her ‘big’ sister’s cock.

Applejack trembled, shook as she slipped down to the three-foot mark. She felt a noticeable bulge in her belly from her sister’s enormous tool and groaned when her own cock spurted out a few thick ropes of pre from the pleasure alone. Applebloom’s nipples, each on the width of a smaller pony’s fist and harder than anything but her cock, rubbed against her back, their leakage mixing with her sweat.

She felt full, incredibly, impossibly full. Applebloom’s member had filled her marehood up to the brim and then some, but she was determined to go all the way, to her womb if she had to. Applejack kept pushing, grunting, squirming as she tried to force her way down even further. She was squatting, her thick, powerful legs flexing as they lent most of her body’s weight to Applebloom’s enormous shaft.

Applebloom’s shaft was oozing pre in a steady flow. It lurched and shuddered with arousal as Applejack slowly pushed her way down. But for Applebloom, that wasn’t enough. She bit her lip, struggling against her own arousal as a cock thick enough to rival Applejack’s waistline in sheer girth bulged forth in her sister’s belly. It was rigid, achingly stiff—and it still wasn’t all the way in. She bit even harder on her lower lip, closed her eyes, and tightened her grip on Applejack’s waist.

With a cry, Applejack felt herself being pulled downward. She was rammed the rest of the eight inches down onto Applebloom’s lap, the bulge in her belly thrusting upward until it, along with the steady flow of pre from Applebloom’s flare, was incredibly, obscenely visible. Stars flashed across her vision, and she threw her head back into her ‘big’ sister’s bust as an orgasm rocked her marehood, leaving her vaginal walls quivering and shaking around Applebloom’s massive tool. But still, Applebloom didn’t cum.

But Applejack was determined to help her get there. Gritting her teeth and feeling at the enormous bulge in her stomach with both hands, she flexed her powerful thighs and quads and forced her body up Applebloom’s enormous tool as far as she could. Her muscled bubble butt brushed against her sister’s snout before she felt like she’d gone far enough. Then, with a gasp for air and a mighty cry of lust, pleasure, and pain, she crashed herself back down onto Applebloom’s throbbing shaft.

Applebloom cried out in return. “Yes!” she moaned. “Oh, yes, Applejack. Yes, yes, yes!”

Applejack smirked, sweat streaking down her trembling face. “You ain’t seen nothin’ yet,” she snarled. She lifted herself up, and plunged back down again. The bulge popped in and out of her, her womb slowly filling up with pre as Applebloom’s shaft fucked her sister’s entire body.

“Yeah,” Applejack grunted, her stomach repeatedly deforming with Applebloom’s thrusts. The larger mare’s hips were jerking up and down in time with her pumping marehood, her heavy balls spilling over her thighs as they swelled up with more and more gallons of thick, white cream. “Oh, yeah. That’s it.” She closed her eyes, her powerful thighs forcing her up and down, up and down as her whole body was wracked with pleasure. “Fuck your sister. Fuck your sister with your huge, fat cock.”

Applebloom was moaning, squirming, twisting as Applejack’s convulsing pussy filled her with pleasure. She could feel the pressure mounting deep within her as her nuts swelled to incredible sizes, filling with gallons and gallons of seed. It was a burning in her loins, a dam ready to explode, a dragon waiting to explode forth—

With a shout of immeasurable pleasure, she came. Her hips jerked wildly up into the air, against Applejack’s tight ass as impossible amounts of spooge flooded forth from her bulging cocktip and directly into her sister’s womb. Applejack screamed too, her own orgasm crashing upon her in waves of pleasure as cum mixed with pre inside of her, swelling her belly even further around Applebloom’s shaft.

Gobs of spunk erupted from Applebloom’s tip, splattering against Applejack’s inner walls as her tight pussy vigorously pumped the former’s massive shaft. It flexed and erupted, letting loose a tidal wave of spooge inside of her smaller sister’s womb. Applejack groaned mightily as she felt her belly swell beneath her fingers, Applebloom’s bulge losing definition as untold gallons of spunk rushed in to fill her.

Thick gooey spurts of cum exploded forth as the euphoria of release overcame Applebloom’s mind. The intoxicating scent of her seed filled her lungs as her jets of spunk spattered noisily against Applejack’s insides. Applejack’s belly continued to grow, swelling with seed until it spread out before her in a massive sphere as big as—or even bigger than—either one of her enormous S-cup breasts. She could feel her sister’s cum sloshing inside of her filling her up, bloating her belly to incredible proportions.

And then Applebloom began to grow. She groaned, low and throaty as her orgasm doubled in size, soon followed by the rest of her. Her head began to inch even further up toward the ceiling, her every muscle thickening and swelling as her breasts began to swallow up Applejack herself, the smaller mare resembling little more than a cocksock for her ‘big’ sister. Her cock throbbed mightily and grew even larger as its owner passed nine feet and stretched toward ten—no, eleven.

Finally, at just a few inches under twelve feet, Applebloom felt her orgasm stopp. Holding her head as stars flashed before her eyes, she stood up, rather unsteadily. Applejack was swept up along with her, her own massive body speared like a cocksleeve around her sister’s even larger member. Her massive, bloated belly, sloshing with cum, hung below her like an enormous water balloon. She drew in a deep, shuddering breath, and found that she had no words to say.

With a mighty crash, Applebloom fell to the floor. Luckily for Applejack, she fell on her side, so that her broad shoulders absorbed most of the weight instead of collapsing directly on top of her. Applejack’s cum-filled belly sloshed and bounced in front of her as the two hit the ground, the wooden floor shaking and even splintering between their massive weights.

Applebloom groaned, her whole body shuddering in the aftershocks of pleasure. “Oh, gosh,” she moaned. “That felt...so good.”

A small smile came to Applejack’s face. She tried to curl an arm around her big, cum-bloated belly and found that she couldn’t even reach halfway around. “I’ll bet it did,” she said, and cuddled her back further into her sister’s massive, pillowy bust. “Feelin’ better?”

“You have no idea.” Applebloom grunted as her softening cock slowly slipped free of her sister’s marehood, a wet-sounding schlick filling the air. Applejack could feel it now against her back, big and thick and warm, as her larger sister pulled her into her, her massive hands laying gently on her sloshing cum-belly.

Applejack’s smile widened. “Glad to hear it, lil’ sis.” She paused, then chuckled. “Or should I call you ‘big sis’ now?”

Applebloom smiled sleepily, her eyes still closed. “I think...mm..I think I kinda like that,” she murmured. “Lil’ sis.” She curled Applejack into her, feeling her massive muscles bulging around her sister’s cum-bloated frame, and sighed happily. Applejack sighed happily too.

The two just lay there, content to bask in the afterglow, with Applebloom’s incredible size filling the room around them. Applejack could feel the rise and feel of her new big sister’s chest pushing her shaft between her shoulderblades. She smirked, a thought occurring to her.

Her own growth spurt had lasted a good two weeks. Idly, she wondered, chewing on the inside of her cheek, just how big Applebloom was going to be twelve days from now.

She closed her eyes, a soft smirk on her face. Now that, she’d like to see.