All Grown Up

by Megapone

Rating: mature
Tags: Slice of Life, Anthro
Length: 7642

Applebloom is tired of waiting for her second growth spurt to come. So when she wakes up one morning with the body of an amazon and a pair of genitalia to match, she's overjoyed. Fortunately, Applejack is there to help her get used to her new body.

Mares in the Apple family have a tendency of growing a bit "bigger" than the average pony. Two months after her eighteenth birthday, Applebloom is tired of waiting for her "second puberty" to hit, and equally tired of looking up to her big brother and even bigger sister. So when she wakes up one morning with the body of an amazon and a set of genitalia to match, she's overjoyed, but also a bit overwhelmed. Fortunately, big sister Applejack is there to help her get used to her new big—and growing—body.

Contains: Futa, incest, hyper dick/balls/breasts, amazon/mini-giantess, growth, muscles, cum inflation, and stomach bulges

A commission for Borealium. Note: All characters are over 18.

Published 1970-01-01 00:00:00 UTC
Last updated 2015-07-22 02:20:02 UTC

Waking Up

Applebloom opened her eyes blearily. Sand from sleep still clung to her eyelashes, blurring her vision. She rubbed it away, then stretched out, yawning—

—and paused, blinking, when she felt her cold feet sticking out from underneath the blanket. In fact, it didn't even feel like they were on the bed anymore...

She sat straight up in bed. A loud ripping noise filled her ears. Suddenly, Applebloom was aware of the cool morning air brushing against her back. She stared down at her nightgown—or, more accurately, at the twin mounds of flesh rising against her chest, and blocking most of her lower body from sight.

Hardly daring to breathe, Applebloom threw off the covers. A totally new body greeted her. She was able to rest her arms on her bust—which had grown noticeably bigger, each former-C cup boob more than a triple-M by now. She pulled them in, watching her much larger biceps flex with awe. She'd always been fit from working out on the farm, but her arms were huge! Not even Big Mac had bigger arms than hers!

She shivered, then glanced down past her chest toward her crotch. A thick, straining bulge greeted her. Her nightie had been pushed up to around the halfway point of her thighs, which were now twin tree-trunk-sized slabs of size and muscle. With that, the bottom of her panties had become visible: overstretched, overstuffed, and just barely musky.

Applebloom stared with barely constrained glee at the enormous bulge between her legs. She tentatively prodded it with a finger, then shivered when she felt a wave of pleasure dance up her spine in response. All the other things could be explained away, but this... This meant that the day had finally come!

She swung herself out of bed, then flinched back when she saw the ceiling rush down toward her. She held herself still, hardly daring to breathe, but the tops of her ears were still over a foot away from the top of the eight-foot room. Still, she felt an indisputable need to hunch over as she moved from her bedside to her door-mounted mirror.

Another surge of glee filled her when she realized that she couldn't even see her head in the mirror; the highest thing she could make out was her pair of massive breasts, which jiggled lightly when she prodded them. Her hands went a little lower, rubbing softly against her new washboard abs while her arm flexed bigger and bigger by the second. Lower still...

Her palm brushed across the gigantic pouch that her new equipment had made in her panties and nightgown, and Applebloom nearly moaned out loud. She couldn't see it yet, but she could feel it: an enormous, warm shaft filling up her overstuffed clothes with more than a foot of sheer virility. She tore off her nightie—it wasn't hard; the fabric all but shredded around her massive, heaving bust and her bulging arms—and goggled at the massive package that was now filling out her underwear.

It was a long, thick shaft that rested comfortably above her new nuts, angling downward over them toward the ground. Breathing out softly, Applebloom brushed her fingers against her nutsack, a nervous smile darting across her face when she felt them sloshing with unspent cum. Each one had to be the size of a cantaloupe, at least! And that stallionhood...she estimated it at around a good ten inches long. Soft.

She'd been waiting two years for this. "You'll get it," Applejack had told her on her sixteenth birthday, towering above her, her own stallionhood straining hard against the fabric of her pant legs, her rippling muscles bulging through her skintight shirt. "All Apple women get it. You'll just have to be patient, s'all."

Applebloom was nearly trembling with excitement. She'd done her waiting. She'd been more patient than anypony had known. And finally, her waiting had paid off. She almost dashed out of her room to show everypony before she realized that she had nothing on but a chemise and a pair of panties that covered only a fraction of her thick, deep-yellow stallionhood.

She checked the closet. None of her normal clothes even came close to fitting her. A quick measurement with the tape measure she’d hidden away a year or so ago showed her to be six feet and nine inches tall on the dot. A big mare like that wasn't going to have a lot of success wearing clothes that had belonged to a five-foot-eight mare just hours before. She frowned, pondered her choices, then threw on an extra baggy pair of sweatpants that she found toward the back of the rack. Sure, they were tight as hell around her thighs, calves, and waist, and only went down to the tops of her shins, but at least she was able to struggle them on with only a little difficulty.

As for tops... She eyed her collection of tops skeptically, then decided to keep with her current sleeping top. Sure, it might be stretched to its limits around her new broad shoulders and her enlarged breasts, but she had her doubts about getting it off, let alone getting anything else on. The family would just have to deal with seeing her nipples poking through, she decided with a blush, at least until she could borrow some clothes from Applejack

Applebloom's oversized breasts bounced against her chest as she made her way to the kitchen. Her top, which somehow had managed to contain them, covered little below her nipples, and most of her bust was free to flap about with even the slightest motion she made. Taking note of her new size, she eyed the lower-seeming ceiling and the walls warily. The hallway seemed tighter around her, as though moving a single inch to either side would cause her arms to scrape against the wallpaper. She took that thought and savored it, thrilling at her newfound size.

She was also somewhat intimidated by it, though. She needed to show—and talk to—Applejack.

Her bulge swayed from side to side as she walked, her heavy footfalls shaking the wooden floors. She could almost feel the unspent seed sloshing about in her massive, melon-sized balls.

Applebloom took a deep breath and stopped before entering the kitchen. She could feel her chest inflating impressively as she took in air, could feel her muscles bulging just a little bit bigger and tighter. Okay. She could do this. With a cheery grin plastered on her face, and a steadfast decision to ignore the air she could feel against her nipples through her shirt, she turned into the kitchen. Her broad shoulders brushed against either side of the door, and she had to duck a little to get through, but she made it in.

"Morning, y'all," she said cheerily. The kitchen's ceiling was, thankfully, much taller. "How're y'all doing?"

Applejack was at the table; Big Mac at the stove. Both paused and looked up to greet her—and up, and up, and up. Big Mac's jaw dropped. Applejack's eyes widened, and a massive grin spread across her face.

"Applebloom!" Applejack said. She stood up from the three chairs she'd laid out by the kitchen table to hold her own bulk. She drew herself up to her full height—eight foot ten, just over a foot taller than Applebloom now—and rushed over to her little sister. Her own massive bulge and bust bounced happily as she strode over, and the floor shook even harder beneath her near half-ton weight than it had for Applebloom's mere four-hundred-fifty pounds.

Applejack seized her little sister in a bearhug—although, Applebloom noted with a grin, not so much littler anymore. For what seemed like forever, Applejack had always towered over her: a massive giantess with a bust to die for and a bulge in her crotch bigger than her torso. But now, instead of staring at the top of her sister’s rippling abs, the top of Applebloom’s head just barely reached Applejack’s shoulder. Applebloom felt a rush of pride and power. She'd been waiting for this for too long.

Applejack echoed her thoughts. "Golly," she said, squeezing Bloom tight. "I told you, Bloom! I told you, you'd just have to wait." She pulled herself back, still holding Applebloom by the shoulders. Her big hands squeezed her tight, and her grin spread even wider. "And see? It all paid off, didn't it?"

"You bet!" Applebloom was suddenly very aware of the fact that Applejack's own nipples were brushing against the tops of her breasts—and that they were also very much erect. She also became aware that Applejack's larger crotch bulge was rubbing against the top of hers, her larger shaft and balls nearly obvious in her sister's too-small pants. A soft blush spread across her face; she hoped Applejack didn't notice. "I just woke up this morning, and...well." She shrugged helplessly, admiring the way her upper arms flexed and bulged with even that simple motion.

"Oh, I am so proud of you, AB." Applejack slapped her on the back, then turned to Big Mac. Mac was still standing at the stove, jaw agape. "See that? Our little sister finally grew up!"

Big Mac eyed Applebloom with a mixture of shock, awe, and slight shame. He'd always known, intellectually, that as an Apple stallion, his sisters were destined to outgrow him. But he'd gotten his name for a reason, dammit. When Applejack had gotten her spurt years back, it'd been somewhat easier to accept. But Applebloom? The baby? He eyed her from head to toe, particularly her bulging thighs and arms (they had to be at least two or three inches wider than his), her bigger bust (he began to sweat nervously), and her absolutely incredible bulge.

If she’d woken up as tall as Applejack, then maybe it would have been a bit easier to accept. But as it stood, she was barely—barely—three inches taller than he was. Suddenly, the mare he’d grown so used to seeing come up to his pecs was looking down on him, even if just by a little. His hands trembled, and though he forced a smile onto his face, there was one thought on his mind: As a stallion, Big Mac suddenly felt very, very inadequate.

"E-eyup," he said, somewhat shakily, then quickly turned back to his cooking. He let out a quick curse when he saw that the eggs he'd been making had burned. He dumped them out into the trash and got out a new batch.

"Hey, Mac," Applejack called, seating herself back on her triple-seat by the table. "Better make that a double order. Or a triple, even. This filly's gotta be hungry."

"I'm not a filly," Applebloom groused. "My birthday was last week."

"Sure," Applejack said. She winked, and punched Applebloom on the thigh. "You'll always be a filly to us. Right, Mac?"

Another gulp. Another "ee-y-yup!" from Big Mac. He hurriedly cracked another ten eggs into a new, giant mixing bowl and got out another three pans. Somehow, he thought he'd need them.

"I am feelin' kinda hungry," Applebloom admitted.

Applejack chuckled. "'Course you are. You're a growing mare, after all. Why, you're already bigger than I was after I got my first spurt—by a good few inches! And hold up there, AB," she said as Applebloom made for a chair. "You're way too big for that one. Pull up a second one. Should hold your weight better." She patted her own muscular thighs, then glanced meaningfully up at the ceiling. Even sitting down, Applejack was a good six and a half feet tall, big enough to be only three feet away from the ceiling in here. And the Apple family kitchen had a tall ceiling.

"Oh," Applebloom said. A blush hit her cheeks, but it wasn't just embarrassment. There was pride there as well. She grabbed another two chairs, arranged the three as best she could, and plopped herself down in them. Her massive, muscular ass covered most of two, and she was happy enough when they all creaked, but still managed to hold her weight. She eyed the table—she had to spread her knees wide around it, because there was no way they'd fit underneath anymore, but the tip of her bulge just barely pushed underneath the tabletop, and the bottoms of her massive breasts still rested on the surface. She decided to leave it for now.

"Oh, I am just the proudest," Applejack gushed as Big Mac set down an enormous bowl of eggs, bacon, and toast in front of Applebloom. "You're already so big—and you're just gonna get bigger! Why, everypony at the next Reunion is just gonna go nuts over you. Even big cousin Red Delicious! Oh, it's gonna be great."

Applebloom was nodding vacantly as she ate. She had other things on her mind: namely, Applejack’s own big body. She’d noticed other mares and stallions since she’d finished puberty, but she’d never really noticed Applejack in that way. It made sense, after all; she was her sister. But now, with her new, bulked-up form, Applebloom found her eyes roving hungrily across Applejack’s straining bust, her towering form, that massive bulge that bobbed at her crotch whenever she took a breath.

She felt a certain kinship with her, now, now that they shared the same body. For so long, Bloom had felt like she’d been left behind—as though Applejack was an unattainable ideal that she would never reach—but now, today, she felt as though it was finally within her grasp. And so, something told her, was her sister.

She blinked quickly when she realized that her own massive bulge had started to chub up beneath the table. Applebloom quickly squeezed her legs together, then nearly moaned when the only thing that accomplished was stimulating her already sensitive balls further.

She had to get her mind off of this. Had to keep herself from visually molesting her sister’s larger body. But, as her pants started to audibly stretch and groan from the strain of holding her swelling erection, and as the tip of her bobbing stallionhood began to brush against the bottom of the table, Applebloom realized that she had to change the situation, and fast—before she broke out a massive boner right in the middle of the kitchen.

“Clothes!” she blurted out, interrupting Applejack. “I, uh, I need clothes.” Her cheeks instantly flushed.

Applejack paused, then gasped. “Dang it! I knew I’d forgotten somethin’. Well, shoot—there’s no way you ain’t about to tear your way out of those tiny old things. C’mon.” She stood up, the floorboard creaking under her enormous weight as the giant pouch holding her package sagged against her thighs. “You can use some of my old clothes.”

Applebloom was more than happy to follow her out of the kitchen, ducking underneath the doorframe behind her as Applejack nattered on about old shirts and pants. Meanwhile, Big Mac busied himself with cleaning up the remnants of a meal large enough to suffice for a full three of his own breakfasts. He had a bit of a start when he found the trail of dripping pre Bloom had left behind her, though. He just shook his head and set back to cleaning up after his larger siblings.

Getting the clothes turned out to be easy enough. “A mite tight,” Applejack observed, watching Applebloom try on her first post-spurt clothes, “but a sight better than those doll’s clothes y’had on before.”

Applebloom readily agreed.

She went through the rest of her day in something of a haze. Her chores were easier—she found herself lifting bales of hay with one hand that she would have struggled to handle with two just the day before. She savored the sensation of feeling her ears brush against the top of the barn door; loved looking down on the cows instead of up. Sure, she was a little clumsier at times; it seemed that every hour, her limbs flung out a little bit farther than before. But that was what happened after all growth spurts, right? You had to adapt.

But Applebloom wasn’t done growing—not by a longshot. Hour by hour, she crept upwards into the air. Six feet, nine inches became ten, then eleven. Soon, Applejack’s clothes (which had been tight on her already) were straining to hold all of her in. The pants only came down to the middle of her shins; her sleeves stretched and groaned every time Bloom’s massive biceps flexed. And the bulge in her crotch was getting tighter with every passing hour, which did absolutely nothing to nullify the growing volume of warm, sloshing cum in her heavy balls.

Finally, a bit sweaty, and a bit grimy, a seven-foot-two Applebloom ducked down into the front door of the house and made her way down the hall. Big Mac stared as she went past; was it his imagination, or did it look like his eyes just barely came up to her neck? With a nervous twitch, he shoved the thought out of his mind and went back to tidying up the kitchen.

Applebloom fell onto her small bed with a groan of satisfaction. After a hard day of work, it felt good to relax like this. She had a bit of trouble struggling out of her now-smaller clothes, but once she got her muscles—and massive package—free, she exhaled a sigh in relief. She flopped back onto her mattress, the springs groaning beneath her weight, and frowned when she felt an unfamiliar throbbing against her chest.

She peered over her bust, and her lips formed an ‘o’. A fat, throbbing erection stared her right back in the face, her swollen cockhead brushing up lightly against the underside of her breasts. Applebloom’s lips twitched, and she reached down and let her hand brush against her shaft. Instantly, her whole body trembled, and a generous glob of pre spurted out onto her breasts.

Breathing a little bit harder, Applebloom checked that her door was closed. Surely nopony would mind if she did a little bit of...experimenting with her new equipment, right? Just to get some release. She felt her heavy, churning balls weighing against the insides of her thighs, then felt them suddenly retract against her body as she began to stroke her shaft in earnest.

With a cry, she let her hips buck forward. Rope after rope of thick, creamy cum erupted from her tip. Her balls were sloshing, churning as they expelled pints and pints of her seed from her flared head. Applebloom’s vision was flashing white as waves of pleasure word through her; her entire body jerked as more and more spooge erupted from her tip, splashing onto the ceiling and floor.

Finally, her orgasm ran out. With a groan, Applebloom flopped back onto her bed and let the warmth of release spread through her body. With her legs and arms hanging off the sides of the bed and the two massive pillows of her breasts resting on her chest, Applebloom slowly drifted off to sleep.

All through the night, she slept on, unaware of the pops, creaks, and groans that filled her quiet room. Hour by hour, her body inched along her mattress, growing, demanding more and more size, overflowing her bed. Her massive member throbbed steadily on her stomach, leaking a steady stream of precum. And through it all, the growing Applebloom stayed happily asleep, dreaming of Applejack.

Sleeping Over

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.