Bulking Up

by LewdChapter

Rating: mature
Tags: Sunset Shimmer, Profanity, Twilight Sparkle (EqG), Slice of Life, Human, Aria Blaze, Porn, Trixie, Fetish, Equestria Girls, Sex
Length: 8635

Sunset helps a friend put on some mass. It doesn't go well.

Sunset Shimmer is a big girl. Massive. Over 8 feet tall and with a bodybuilder's physique. She keeps herself in shape by hitting the gym daily. Today, after failing to help her friend Sci-Twi get buff like her, Sunset learns that there's big, and then there's giant.

WARNING: this story contains futas, muscles, sweat, embiggening, macro, spitroasting, cum, and the most disregard for human biology yet.

Cover is 2636089 on Derpibooru

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Published 2021-07-25 17:20:03 UTC
Last updated 2021-07-25 17:20:03 UTC

Bulking Up

"Come on, Sparkle, five more reps!"

Sunset knew that, as far as physical fitness went, she was very much so an outlier. She knew that not many could match her for power or size (in fact, only one came to mind, but Sunset would need to keep Aria waiting a bit longer), and she didn't really expect them to. While Sunset typically worked out alone, save for her pair of gym partners/bag-holders/sweat-rags/ball-drainers, she was more than willing to help others get themselves into shape, especially her friends. If she could serve as an inspiration to those around her, then the mild inconvenience of being an 8-foot amazoness was more than worth it.

That being said, helping Twilight Sparkle get into shape was a herculean task that Sunset wasn't sure she could manage.

"I… can't!" panted Twilight, her modest chest heaving as she struggled to get the bar up even one more time. Her entire body was drenched in sweat, her glasses having long ago slid down her face and landed in a pool of her exertion. "Sunny! Sunny, help! It's too heavy! Please… take some of the weight off…"

Sunset looked down at the bar that Twilight was struggling with, completely devoid of any plates, and rolled her eyes.

"Maybe we should take a break…" sighed Sunset, lifting the bar up with just two fingers and setting it on the rack. "You sure about this, Sci-Twi? I've never heard you talk about working out before."

"I never… had a reason to…" Twilight lay limply on her bench, looking as though she was one foot in the grave. Sunset dug into her nearby gym bag and gave her a bottle of water, which Twilight gratefully accepted.

"Still not sure 'because Timber thinks it's hot' is a good reason to kill yourself trying to get buff."

"Not buff. Just a little mass," breathed Twilight. "Besides, it's not just to impress him. Despite eating right, I'm still in terrible physical condition. I had to run to the bus stop this morning and got winded."

"Sci, the bus stop is literally right outside your door."

"Exactly! I need to make this change." Twilight sat up, wincing at how sore she already felt. "I can't help but feel like I'm going nowhere…"

"Don't worry about it, man. No one gets ripped overnight," said Sunset. Twilight peered at her, arching a brow curiously. "Okay, maybe some people, but I'm a freak case. I shouldn't even be close to this big, and this muscle is something I've gotta work to maintain." Sunset flexed her arms, nearly shredding the fabric of her sweatshirt with her awesome musculature. "What, you think keeping up on these guns is easy?"

"Yo, Shim."

Sunset turned and looked across the gym, pleasantly surprised to see her rival/workout partner standing in the doorway. Aria didn't seem to be there to work out, being clad in her favorite jeans and rough denim jacket. She crossed her thick, meaty arms over her ample chest, smirking slightly as she mentally reconstructed the scene before her.

"Sup, String Bean," said Aria, nodding to Twilight.

"Hello, Aria." Even though Aria definitely had a point, Twilight couldn't help but roll her eyes in annoyance.

"What's up?" asked Sunset. "You're supposed to be getting things ready for the weekend, did something come up?"

"Yeah. Two somethings came up, as a matter of fact. One with a big ass and one with a big mouth."

"Oh, for fucks sake…"

"Yeah, I guess the midget thought blowing me might piss you off, and you know how Candy Ass gets," said Aria with a shrug. "I told Nata and Dag to get them ready for us, but I don't know how long those four can last without fucking up my apartment. Hurry up and finish your whatever so we can dick these idiots until they shut up."

"I'd appreciate it if you didn't talk about that sort of thing in front of me," said Twilight. "And if you didn't call my friends such offensive names."

"What, is midget really that bad these days?"

"I was talking about what you called Pinkie. Trixie is not my friend."

"I should probably go. Technically, I owe Trixie a, uh… a session, anyway," said Sunset. "She was supposed to get my last round the other day, but then Adagio showed up, and…"

"Yeah, my sister has some nice dick-sucking lips," said Aria, rolling her eyes. "If you're coming then let's go, before I head back home and hog the four of them to myself."

"It's okay, Sunny. You can go," sighed Sci-Twi. "I've got work to do back home, anyway."

"You sure?" asked Sunset, watching as Sci-Twi packed her things up. "Seriously, I can tell Aria and the others to wait an hour for me—"

"Yeah, no, no fucking way am I waiting for you," snickered Aria. "You've got about another 45 seconds before I leave you here and go tear into Thiccy Pie's fat ass all night."

"Yeah… If you wanna keep going, I can stay with you." Sunset glared at her friend, more than annoyed both by Aria's lewd comments and how little she seemed to take this seriously. "I wanna help, so…"

"No, no, it's okay. I think I'm going to do some research first, anyway." Sci-Twi waved the amazons away, trying to smile reassuringly. "I'll be fine, honest."

"Well, if you're sure…" Sunset slowly grabbed up her gym bag and slowly crossed the room to join Aria, keeping an eye on the sweaty scientist as she did. "We still on for Monday?"

"Yeah, sure. Monday. You two go have fun with your… Er. Orgy."

"We will." Aria laughed, stroking the thick bulge of her cock against her thigh. "We're gonna have us a good old time…"

"Right… Well, good luck with… That," said Sci-Twi sheepishly. "Er… Tell Pinkie I said hi."

"We will, when she's not too busy sucking my—" Sunset punched Aria in the arm with a level of force comparable to the swing of a baseball bat. Enough to reduce a grown man to tears, but it seemed to only mildly irritate Aria. "Ow! The fuck, man?"

"Will you quit being a horny dickhead and let's get out of here?" said Sunset with a shake of the head.

"About fucking time. If I get back home and see that your shortstack fucked up my living room, I'm gonna destroy her."

"You'll have to wait your turn. Let's bail. Later, Sci!"

Sci-Twi waved as the two massive ladies departed for their own fun. Now that she was alone, she had time to think. Sci-Twi was not at all happy with her progress in the field of physical fitness, and, when things weren't going her way, she would often fall back on her scientific expertise. Perhaps there was more she could do to aid in her workout routine. Some sort of diet or new regiment that could help her get in shape. It would be hard work, a very tall mountain to climb. Sunset was right: it just wasn't possible to get buff and cut overnight.

"Unless…" Sci-Twi grabbed up her phone, dialing home as her mind raced with ideas. She put her phone to her ear, already doing some preliminary calculations in her head. "Hello, Spike? Get the lab ready for me, and start the coffee maker. I'm planning something big, and I'm going to need a lot of caffeine."

The next evening

Sunset grunted like a beast, using her right hand to shove Trixie's head into the cushions of the couch as she rammed her from behind. The magician moaned into the upholstery, her entire body convulsing as their fuck session stretched into its 4th hour. Sunset and Aria had cum in and on her various holes so many times, she had lost count (and Trixie herself had cum even more). Hours and hours of violent, uninterrupted sex with two giant muscle girls like Sunset and Aria probably should've killed a pint-sized wannabe wizard like Trixie a dozen times over by this point.

Basically, it was the perfect weekend for Sunset and her cock-fiend girlfriend.

"Jesus, these two just don't quit," laughed Aria. She leaned back on the couch, relaxing beside Sunset with Pinkie on her knees right in front of her. Unlike Sunset, she had opted to take a bit of a break, holding an ice-cold beer in one hand and using the other to push Pinkie's head down onto her fat cock. "Aren't you two tired?"

"Losing steam, Aria?" panted Trixie, somehow managing to maintain her smug, condescending tone, even while halfway fucked into a coma. "All the more proof that my Sunset is—Oh my fuck, that's so deep!"

"Shut the fuck up or I'll wake up Adagio so she can take your place," growled Sunset, slamming her hips forward until she was bottomed out in Trixie's tiny body.

"Sorry…"

"Why bother waking her? She might be upset until she realized whose dick it is in her guts," noted Aria. Pinkie hummed in agreement, giving a loud slurp on Aria's meat. "Don't suck too hard, Candy Ass, you'll spoil your dinner." Pinkie let out a mostly incomprehensible grunt of protest, nearly choking on the Siren's girth. "Yeah, I guess you probably have a hell of an appetite."

"How long has she been down there?" asked Sunset curiously.

"Uh… two hours? I dunno, all I remember is that she was licking my balls when I ordered pizza."

"You ordered pizza? Two hours ago?"

As if spurred on by that very comment, there was a knock at the door. Sunset glanced over to Aria and Pinkie, both of whom had brought their finger to their noses, exempting them from having to get the door. Seeing as Trixie had been fucked so hard that she had been unable to stand for the last few hours, this left the duty to Sunset. With a groan of annoyance, Sunset pulled her dick from Trixie's ruined hole (giving her ass a nice, hard spank for good measure), and crossed the room to the door. She paused for a moment, looking down at herself thoughtfully. Hard dick, tits out, wearing nothing but a healthy sheen of sweat. Not exactly the most presentable she'd ever been, nor was it a very polite way to answer the door.

Then, she remembered that she was a huge, ripped, 8-foot giantess, so the guy was probably gonna stare at her anyway. With a shrug, she pulled open the door. Standing in the door frame was a wimpy, wiry delivery boy, awkwardly holding a stack of several pizza boxes and trying to read the associated receipt.

"Order for… Buffset Fatcock?" The delivery boy looked past his boxes, getting a healthy eyeful of the amazon before him. "Oh! Sorry, I… huh, so that's your real name…"

"My name is Sunset, my friend is just a fucking idiot, said Sunset, rolling her eyes. The delivery boy nodded silently, staring at Sunset all the while. "You wanna just stare at my tits or do you wanna snap a pic for the spank bank?"

"Sorry. I… Anyway, you ordered 4 large plain, 3 large supreme, 5 extra-large meat-lovers, and 1 large Hawaiian?"

"Aria, why did you order 13 goddamn pizzas!"

"Cause I assumed the dwarf and sugar tits here would be hungry for something besides cock!" said Aria. Pinkie nodded about as well as she could with Aria's dick still twitching in her throat. "See? Besides, we can go through like 8 of those on our own, I feel like, 4 can be for the fuckmeat, and I wanna see if I can trick Dag into eating pineapple pizza if I cum on it enough."

"That was a rollercoaster from start to finish," said the delivery guy with a nervous chuckle. Sunset leered down at him, crossing her arms over her chest.

"How much do I owe you?" she asked dryly.

"Um… $241.19."

"I've got the cash in the coffee table," groaned Aria as Pinkie slid down low enough to touch Aria's balls with her chin. "Fuck, do you just not gag?" Sunset shook her head, crossing the room to grab the money so she could finally get this exchange over and done with. "Don't forget to give him a nice, big, fat tip, Sunny. If you catch my drift."

"Would make for a hell of a story to tell my friends," chuckled the delivery guy.

"Kid, you're cute and all." Sunset grabbed the pizzas with one hand and handed the stack of cash to the delivery guy with the other. "But you'd be dead before I get halfway in. Take the money and run, before Aria decides she wants a piece of your ass."

"Trust me, I've got plenty of ass here," said Aria. Pinkie rose up, as if to respond, just to be stopped by Aria's strong, unflinching hand. "Don't ruin it by talking. Just keep on sucking."

"I hate to encourage you, but I'm really impressed you managed to keep her quiet this whole time," snickered Sunset, grabbing a slice of pizza from the box. "She's never this quiet. Not even when I'm dicking her."

"Obviously, she likes me better."

"Really hate to interrupt whatever the hell kind of weird fetish thing I walked in on," said the delivery guy. "But do you guys feel that?"

"What are you…?" Sunset froze, the rest of her sentence lost as she focused on what was happening around her. Sure enough, there was some sort of rumbling, quaking, that seemed to be getting closer. Like a series of earthquakes, shaking harder and more violently with each tremor. "The hell? It's almost like… footsteps."

"Can you hurry up over there and come finish me off?" complained Trixie, sitting up on the couch. "Because Trixie, for one, is horny and hungry, and I demand that you—"

The entire building quaked, knocking Trixie from her seat and to the floor. Sunset nearly lost her balance from the shaking, and even Aria, who had maintained her seated position, braced for impact. Sunset dropped her pizzas to the ground, steadying herself for a moment before hurrying to look out of the window in an attempt to get to the bottom of this. She skidded to a stop just before the window, her brain unable to comprehend what was awaiting her.

Just outside the window, staring through the glass, was the pupil of a giant purple eye, framed by what Sunset soon determined to be a pair of glasses. The eye shifted, and a flock of birds that had taken refuge on the massive glasses took off into the air. Sunset couldn’t get a full glimpse of what she was looking at, as just the eye’s pupil was almost as large as the entire window.

"What the fresh, never-frozen fuck?" demanded Sunset. She peered a little closer, letting out a gasp as she finally put it all together. "Holy shit… Sci-Twi?!"

"Sunny!" Sci-Twi's massive, booming voice shook the foundations of the apartment complex, nearly knocking Sunset down. "Help!"

"The fuck? We're on the 11th floor!" said Aria. Pinkie squeaked, and attempted to pull her head back to chime in, not getting very far before Aria grabbed her head. "Easy there, no one said you had to stop."

"I messed up, bad!" said Sci-Twi, throwing her hands up. As she did, she thumped the back of her palm against the apartment complex and had to grip it firmly in order to avoid tipping the whole building over. "Please, you guys, I need your help. Quick, before someone calls the government on me!"

"Trix, we gotta go!" Sunset crossed the room and scooped up Trixie before returning to the window; Sci-Twi had used one of her gargantuan fingers to pop the window right out of the frame, and she held her palm out to serve as a platform. "Aria, you too, let's go."

"Do you really need me? I'm sure you can handle it on your own," grunted Aria. "I'm, like, this close to busting down tubby's throat."

"Blaze! Move it!"

"Ugh! Fine! But you owe me for the blue balls, okay? I'm calling dibs on your midget when we get back." Finally, Aria pulled Pinkie's head up and pushed her away, letting her choke some much-needed breath. "Don't worry, Candy Ass, I still plan on ruining you later tonight. Don’t go anywhere." Begrudgingly, Aria joined Sunset and Trixie by the window and, after a beckon from the giant scientist, the three climbed into her hand. Sci-Twi lifted them up carefully and carried them away.

This left a very breathless, very horny, very annoyed party girl gasping in the middle of the living room.

"What the heck, guys?! You're just gonna bail on me?" pouted Pinke, crossing her arms over her chest. "I barely even got any lines of dialogue in this one! I better get more screentime in the sequel…"

"Let me get this straight…" sighed Sunset, pacing across the field. "You heard me say that it was gonna be a lot of hard work and dedication to get into proper shape. You heard me offer to help you. And yet… you still let this happen?!"

Sci-Twi, unfortunately, had very little to say in her defense. Hindsight is often said to be 20/20, and now that she was blessed with that sight, Sci-Twi had to admit that she let things get out of hand. Way, way out of hand.

"It wasn't supposed to happen like this!" Sci-Twi had to lay prone in order to even have a chance at making eye contact with her friends, and even that wasn't a perfect solution. Sci-Twi was, in the most accurate sense of the word, an absolute giant. Bigger than Sunset, bigger than Aria, bigger than anyone. She had stretched to heights never before seen, easily over 100 feet if she stood upright, she towered over any and everything in her path. Much to her annoyance, she didn't even grow any muscle mass, maintaining her same thin, wiry, nerdy proportions, albeit massively upscaled.

"No, it wasn't. You were supposed to stick to a workout routine and get fit, the right way!" Sunset stopped in front of Twilight, pointing an accusatory finger at the gargantuan scientist. It felt strange to have to look up to meet someone's eyes for once (or eye, as it were. Sunset couldn’t actually look at both of Twilight’s eyes at once from this close). "I told you, no one gets super ripped overnight, but you went and took the easy way out with some sort of crazy science shit!"

"Pfft. Science?" Aria scoffed, leaning on the top of Trixie's head for support. "This has gotta be Equestrian magic, meathead. You don't get that big without some weird shit from back home."

"Actually, it's both," admitted Sci-Twi. "I was researching Applejack's super strength to see if it could help me gain some muscle mass. So I plucked a few of her hairs and ran it through my machine."

Sci-Twi pushed herself up to all fours and shimmied a bit to the right before settling down, shaking the ground and revealing a strange machine of some sort; a small platform with a mechanical arm that carried some sort of metal tube. Near the machine was a set of computers, all of which were connected to a series of small generators hastily spliced together into a miniature power grid of sorts. Sunset approached the computers, leaning in close to properly view the screen. After just a cursory glance, she palmed her forehead, this situation annoying her to no end.

"Sci?" said Sunset flatly.

"Yes?" Though now a giant, big enough to destroy the city of Canterlot if she really wanted to, Sci-Twi felt no less meek than usually did.

"Please for the love of God tell me that this 20 wasn't meant to be a 2."

"Oh, of course not," Sci-Twi chuckled nervously, bringing her hand to scratch the back of her neck sheepishly; This simple motion sent quakes throughout the ground, very nearly knocking all three “normal” sized people to the ground. "It was supposed to be a .02…"

"So let me get this straight…" groaned Aria, pinching the bridge of her nose. "You're telling me that String Bean here grew herself 100 feet tall, ruined our fuck party, and dragged us out into the middle of nowhere—ass-naked, by the way—to help her shrink her skinny ass back down… all because she moved a fucking decimal?"

"That's about the long and short of it, yeah," sighed Sunset. She glanced to Trixie, who hadn't taken her eyes off of Sci-Twi since she first saw her newly giant form. "Yo, Trix. What's up with you?"

"She's… so… big…" Trixie's jaw had gone a bit slack, and a devious grin soon spread to her features. "Please tell me she has a dick, too."

"I know we joke a lot about how you shouldn't be able to survive what we do to you, but you would literally explode."

"So I'll just go ahead and ask the obvious question," said Aria with a sigh. "The fuck do you want us to do about it? I know Shimmer is a fucking nerd like you are, but this seems above her pay grade."

"This is where the favor comes in…" Sci-Twi blushed a bright shade of pink, her giant eyes darting away from the trio. "So… the embiggening process occurred because of a massive surge of energy generated by a reactor of my own composition. In order to return myself to normal, I would need an energy surge of an inverse charge."

"Except… it would need to be proportional to your new size. Which would be 20 times as strong as the original surge," said Sunset. "Can your reactor handle that sort of power load?"

"Not without blowing Canterlot City off of the map. Fortunately, there's a safe, energy-efficient, method of generating the necessary energy," said Sci-Twi. She buried her face in her massive hands, shaking her head. "Unfortunately… the method in question is a bit… intimate."

Sunset and Aria palmed their respective foreheads in sheer disbelief, while Trixie was giddy beyond words, simply dancing with excitement.

"You gotta be fucking with me…" groaned Aria.

"Seriously, this is starting to sound like a shitty fetish fanfiction," agreed Sunset.

"We do get to fuck the giant!" cheered Trixie. "Please, for the love of God, tell me there's a way to give her a dick. There's gotta be a button on your machine for that."

"No, Trixie, there is not a button on my carefully-crafted, highly-experimental, bleeding-edge embiggening device that will give me a penis," deadpanned Sci-Twi. "Somehow, that never even occurred to me during the development of this machine."

"What the fuck is the point of it then?"

"Your dumbass plan has a dumbass problem," noted Aria. The girls turned their attention to her, watching as Aria pointed to Sci-Twi's giant form. "Yeah, yeah, me and Shimmer got massive meat. Like, seriously, crazy-long, dummy-thick, bitch-breaking, cunt-gaping, ‘too big to be scientifically feasible but fuck you’ huge cocks.”

“Is your language always this… colorful?” asked Sci-Twi.

“My point is, you're still 100 feet tall. It'll be like chucking hotdogs down a hallway. How are we supposed to do… Anything?"

“Simple. You two will simply step into the machine and embiggen—”

“Are you insane?! Sunny, your friend lost it this time!” demanded Aria. “You want us to super magic-grow as big as you?!”

“Well, the technical term is ‘embiggen’, been meaning to correct you on that…”

“As much as I hate to encourage unsafe magical and scientific experimentation…” Sunset let out a sigh, pinching the bridge of her nose tiredly. “This actually checks out. If we grow…" Sunset paused as Sci-Twi cleared her throat, rolling her eyes before amending her statement. "Oh, for fucks sake… If we embiggen to match her, proportionally, then all we’d need to shrink back down is the same inversely-charged energy.”

“As long as we time it so that we all… ‘finish’ at roughly the same time, all of the energy will cancel out, and we all go back to normal,” said Sci-Twi. “I ran through the numbers before I came to get you. This is going to work.”

“Yeah, did you move a decimal this time?” snorted Aria. Sunset socked her on the shoulder, much to the Siren’s annoyance. “Ow! Will you knock that off?”

"You're not helping," remarked Sunset.

"Yes, Aria, I quintuple-checked my math this time," said Sci-Twi flatly. "Can we please just get on with this? I'm afraid that if I don't get un-embiggened soon, the air force will scramble fighter jets and shoot me down like King Kong."

"Alright, fine. Let's do it," said Aria. She glanced to Sunset, then the machine, then back to Sunset. "You first, Shimmer."

"How nice of you…" Sunset stepped forward uneasily, stepping into the platform of the machine. "Uh… This isn't gonna hurt or anything, will it?"

"No, not at all! The embiggening process is completely painless and 100% safe!" Sci-Twi tapped a giant finger to her chin thoughtfully. "Although… You may feel an odd stretching sensation, and a craving for hazelnuts. Haven’t been able to figure that out…” Sci-Twi shook herself, inadvertently quaking the ground and nearly knocking the trio to the ground. “In any case, just hit the enter button on the keypad, I have all the numbers in. Same for Aria when it’s her turn.”

“And Trixie! Surely you don’t expect Trixie to pass up on the opportunity to become a giant!” said Trixie. Sci-Twi didn’t respond immediately, so Trixie quickly turned and pouted to Sunset. “Sunny! Tell her she has to let me get big! It’s not fair that I have to be small, and you two get to be even bigger! Make her let me use the machine!”

“Sci, do me a solid and just let her use the machine,” sighed Sunset. “I’m so over the little temper-tantrum thing, and I’ve run out of punishments that involve jamming my cock into her. Little bitch is officially too big of a slut.”

“It’s why you keep me around, isn’t it, Shimmy?” said Trixie, batting her eyelids. Sunset rolled her eyes and, despite her best efforts, let a grin slide to her features.

“Maybe not the only reason…”

“In any case, embiggening Trixie shouldn’t be much trouble,” explained Sci-Twi. “Although, four people in one day might be more than my machine can handle… Eh. I’m 99% sure everything will be fine, so long as we all reach… Completion… Within three minutes of each other. Otherwise, the energy will dissipate, and this will all have been for nothing."

"Don't worry, nerd. Don't tell her I said this, but Shimmer's a pretty good lay," said Aria. She shrugged a bit, crossing her arms over her chest. "At least, that's what Adagio says."

"Let's just get this show on the road so we can go home," sighed Sunset. “I was actually really looking forward to pizza…”

Sunset reached forward and, as gingerly as her gargantuan frame would allow, tapped the start button on the machine. The robotic arm leaped into action, panning over Sunset’s unreasonably large frame once from top to bottom before making another pass. This time, a thin plane of blue light slowly skimmed up and down Sunset’s body. Once it was done, Aria followed suit, and lastly, Trixie jumped at the chance to finally grow to a size larger than “childlike”.

“Alright, that felt like a whole lotta nothin’,” said Aria with a shrug. “You sure you didn’t fuck up the math, nerd?”

"It takes a second," said Sci-Twi. "If the embiggening process was instant, it would tear you in half. You have to give it a bit before—"

There was a slight, arcane buzzing, followed closely by a faintly lavender glow that surrounded Sunset's form. A similar light soon bloomed around Aria and Trixie, much to the latter's glee. Sunset looked down at herself, watching the light dance around the bulging curvature of her muscles as the embiggening took hold. Sunset heard it before she felt it, a sound like rubber stretching to its limit. Then, as the sound increased in volume, Sunset was hit with the strange sensation of herself growing taller, wider, inches at a time.

"Oh, yeah," remarked Sci-Twi, scooting her gigantic form back a bit. "You two might wanna back up a bit. The embiggening is going to start slow, but once it starts cooking, it really goes for it."

The three test subjects took a few steps apart, and not a second too soon; Sunset's growth increased exponentially, inches per second turning into feet until, in what felt like a single snap, she shot upward, her body growing and stretching impossibly large, even larger than she could have ever imagined herself getting.

The ground trembled as Sunset grew, the quakes becoming full-blown tremors when Aria's embiggening found its stride. She too sprouted upward, shaking the very Earth under the weight of her awesome size. While Sunset was clearly uneasy about her embiggening, Aria reacted much more positively, letting out a devious cackle as she grew in time with Sunset. Trixie waited patiently, the stretching sound filling her with giddy joy as she prepared to be embiggened.

One can imagine her disappointment when she grew an inch and a half before the energy dissipated from her body.

"Oh. I guess my machine can only handle 3 embiggenings a day," said Twilight with a shrug. She pulled herself to her feet as gently as she could, though she still managed to cause the ground to quake. "Oh, you should move. We don't want to squish you."

Trixie fumed, staring up at the three giants, each over 100 feet tall, and poured as she stomped away.

"This is fucking bullshit…"

Sunset thought she knew what it meant to be big before. For years, she towered above even the largest of her peers, looking down at them as they lived their lives. Now, after undergoing Twilight’s “embiggening device”, Sunset was forced to confront the idea that maybe she wasn’t all that large, after all. Before, when she was only 8 feet tall, she could still function in society. Sure, she had to be mindful of her strength, and she had to get used to the slack-jawed stares from people on the street, and she had to duck down to fit through most doors, but she could still theoretically live a normal life.

Now, when she could accidentally crush her girlfriend with one errant step, Sunset understood that she was just as tiny as everyone else, in the grand scheme of things.

“Holy shit.” Sunset jumped in surprise at the power of her own booming voice, the sound of her exclamation making the ground beneath her vibrate. She took care to lower her voice from here on out, but, considering what she was about to get up to, it was unclear if it would make any difference. “This is… Weird. I know we were already big, but this is next level…”

“Hohohoh! This is awesome!” cackled Aria, making the earth beneath her tremor with her laughter. “We’re fucking huge! Look at us, Shimmer, we’re fucking kaiju! We could stomp over to the city and smash it to rubble until people give us what we want, and why stop at Canterlot City? We can take over the world! This totally—” Sunset punched her friend in the arm, a strike that could easily level a skyscraper, but Aria only let out a small yelp of pain and held her bicep gingerly. “Ow! What the hell?!”

“We’re good guys now, remember?”

“Ugggggh, you’re so fucking lame!” Again, Sunset punched Aria with enough force to cause unspeakable mayhem and destruction if pointed elsewhere and, again, Aria only slightly winced and recoiled. “Fine! We’ll be goody-goodies and not hold the city for ransom. Even though it’d be super easy and fun and cool…”

“Thank you, Aria. I applaud your restraint…” sighed Sunset. She turned to Sci-Twi, who was fidgeting nervously beside her. “So… How do you wanna do this?”

“Well, since we all have to… You know… At roughly the same time…” sighed Sci-Twi. “I suppose the only reasonable, rational, efficient way to do this is for me to take you both at the same time. As for the logistics, I think since I’ve known Sunset for longer, she should—”

“Dibs on pussy, dibs on pussy!” exclaimed Aria. She nudged past Sunset and grabbed Sci-Twi around the waist, heaving the giantess up and tossing her over her shoulder. “You can suck Shimmer off, but I’m railing your pussy.”

“O-okay then…”

“You sounded pretty excited,” noted Sunset, with a smug little grin. “If I didn’t know any better, I’d think you have a little crush on Sci or something.”

“And if I didn’t know any better, I’d tell you to munch my nuts. It’s none of your business where I wanna put my dick,” grumbled Aria. Sunset just stared, and with an almost savage growl, she finally relented. “Alright, fine, I got a thing for nerds. And the little know-it-all is cute, and I think it’d be hilarious if I made her cum her brains out. Bite me.”

“I think that’s a compliment, so thanks?” said Sci-Twi nervously.

“I didn’t give you a hard time when you started taking your sawed-off fleshlight out to dinner, so don’t fuckin’ judge me, Shim.”

“Not judging. Honestly, it’s kinda cute,” said Sunset. She glanced down, only just then remembering that Trixie was on the ground, seething that she hadn’t grown.”Oh, Aria, go ahead and get Sci-Twi someplace nice. I gotta talk to Trixie.” Sunset stooped down to all fours, pushing herself as near to the floor as she could in order to reach some approximation of eye contact with Trixie. “Hey, just checking in before me and Aria, uh…”

“Tag-team your best friend?” Trixie’s voice was so high and shrill, yet Sunset heard every syllable as if Trixie had shouted it at her. It took a moment to consider, but it soon dawned on her that she must have. “Oh, by all means, go on ahead. Trixie will just be here, being short and forgotten… As usual…”

“Aw, don’t be that way, Trix. You know I’d never forget about you. I’m just gonna help Sci out really quick, and then it’s you and me, all weekend,” promised Sunset. Trixie frowned and pouted, her facade slipping when Sunset winked her giant eye and blew a kiss that nearly toppled her over. “C’mon, Trix, what do you think I’d rather be doing? Being an even bigger freak and fucking my friend out of necessity? Or staying home, eating pizza, watching a movie, and wiping my sweaty balls with your face?”

“Trixie does have a nice face for that, doesn’t she?”

“The best face. Now promise you’ll be cool about this? I’m gonna handle Sci-Twi real quick, and then I’m coming back, okay?” Sunset could see that Trixie still needed a bit more convincing, so she quickly sought to sweeten the deal. “I’ll even let you top for a few rounds…”

“Hm… Trixie has always wanted to see what you look beneath me for a change…” hummed Trixie. “Throw in a pegging session, and you’ve got yourself a deal.”

“I look forward to it. Now get outta here, shortstack. I don’t wanna squash you.” She brought her face close to Trixie, making an ill-advised attempt to kiss her; Her mouth was much bigger than Trixie was, and the magician sort of disappeared into the shadowy chasm of her gigantic, luscious lips. Trixie emerged, unharmed, but damp with a layer of Sunset’s saliva and visibly shaken by the ordeal.

“Trixie thinks that was a very sweet gesture but please don’t ever do that again. It felt like you were going to eat me and that’s one thing I’m not into.”

“Sorry, that was hotter in my head. Anyway, I gotta go handle this. See ya, Trix.”

Sunset boosted herself to her feet, trying to move as quickly as she could without shifting the tectonic plates too much. She waved goodbye and, once she was certain Trixie was a safe distance away, Sunset jogged to meet up with her friends. Aria had carried Sci-Twi a few strides (which amounted to several hundred feet) away from the sensitive embiggening machinery, and it was only then did she let the scientist down from her shoulder.

“You know, I was perfectly capable of walking that distance on my own,” remarked Sci-Twi.

“Yeah, yeah, can we go now? I’m still all pent up from throat-fucking Chubs back home,” complained Aria. She put her hands on her hips, tapping her foot restlessly and sending tremors through the ground as she did. “Shimmer, help me get her clothes off.”

Sunset shrugged and, without giving Sci-Twi much time to debate, joined Aria in pulling off the scientist’s giant labcoat. Sci-Twi squeaked in surprise, but didn’t fight the two muscled giantesses as they undressed her. Soon, her top and jeans were successfully pulled from her body, revealing her thin, flat physique. As soon as Sci-Twi was nude, two strong, rough hands grabbed at her breasts, courtesy of Aria from behind her.

“Y-you know, I wasn’t expecting you to be so… grabby,” said Sci-Twi. Despite what she said, she couldn’t help but moan at Aria’s abrasive, powerful touch, especially when she felt a strong, muscular hand snake between her legs to tease at her cunt. “Mm… Oh, this might have been a mistake…”

“Want me to stop?” asked Aria, though she didn’t sound very eager to do so. “I figured that since we’re so big that anyone who looks out of their window can see us, I may as well just go for it, y’know?”

“No, you don’t have to stop. Just… You’re really strong…”

“Oh, I know. Chicks seem to dig it, something about feeling safe in my arms. You like?”

Sunset rolled her eyes at her friend’s poor attempt at romance, then made her way around to Sci-Twi’s front. To her amusement, Sci-Twi was blushing when she got there, her cheeks blooming bright red and radiating heat in time with her gentle moans. Though not exactly her type, Sunset could definitely see what Aria meant about nerds being cute. As Aria continued to grope Sci-Twi, Sunset slipped in close and poked Sci on the nose to get her attention.

“Hey, I’m still here,” said Sunset with a casual wave. “So, just as a warning… Me and Aria can get kinda rowdy sometimes. Something about all this muscle mass and raw strength, we sometimes just fly off the handle a little. But we won’t hurt you, probably, so don’t freak out.”

“As far as r-reassurances go, that left much to be desired,” squeaked Sci-Twi. She slipped her own hand between her legs, guiding Aria’s fingers into her slit. “What do you mean you ‘probably’ won’t hurt me?”

“I mean we won’t do it on purpose, but sometimes, freak accidents happen. We’re, like, really strong.”

“Heh. Remember that time we spitroasted Wally?” snickered Aria.

“Remember? I’m still paying for those hospital bills.”

“H-hospital?!” Sci-Twi’s giant eyes went wide, and she nearly knocked her glasses from her face in shock. “What did you—?”

“Look, she’s fine, and she said it was worth the full-body cast. Now come on, I don’t wanna be this big for too much longer,” said Sunset dismissively. She grabbed her cock, thicker and harder than it had ever been before, and brought it closer to Sci-Twi, stroking herself as she did. “Plus, I’m kinda horny, too. So if you don’t mind…”

Aria placed a hand on Sci-Twi’s shoulder and pushed her forward, until the giantess was bent over at the waist. Sci let out a surprised gasp, at which point Sunset slipped her gargantuan cock past Sci-Twi’s lips. Sunset groaned as she entered Sci-Twi’s wet, warm mouth, and it took all her self-restraint to avoid going to town on her friend right then and there. She held off, both for Sci-Twi’s benefit as well as to attempt to keep all three of them in sync.

Conversely, Aria had few such reservations, and she wasted very little time in penetrating the new subject of her affections; She pushed her meaty member against Sci-Twi’s folds and, without giving her much chance to prepare, she split her open in one deep, calculated thrust. Sci-Twi was seeing stars, her entire body tensing upon the overgrown organ’s entry into her.

“Fuck, you’re snug,” groaned Aria. She gripped Sci-Twi’s narrow waist in her powerful hands, holding her still as she slowly worked her hips. With each thrust, Aria drilled Sci-Twi deeper, harder, carving out a path through her insides with her massive futa cock. “C’mon, nerd, put some work in. Move your hips a little.” Sci-Twi couldn’t speak through a mouthful of meat, but she hummed a sound of agreement around Sunset’s cock, then quickly began moving her body in time with Aria’s. “There we go, that’s what I like…”

“Why does this feel so good?” asked Sunset, pulling gently on Sci-Twi’s hair. She hadn’t even begun to explore Sci-Twi’s undoubtedly tight throat, having decided to let Sci get accustomed to such a large dick for a bit, but even the scientist’s sloppy slobbering sent arcs through Sunset’s gargantuan body. “Sci doesn’t suck much dick, I don’t think, and her technique is kinda meh, but it doesn’t matter for some reason?”

“Maybe cause we’re bigger?” suggested Aria. “We’re going from a foot and a half of nerves in our cock to like thirty feet or whatever.”

“I don’t know if that makes sense but I’m also way past the point of—”

Sunset completely lost the rest of what she was going to see on account of Aria shoving Sci forward, sending them all crashing into the ground. Sunset slammed her back into a nearby hill, leaving a chiseled amazon-shaped dent in the grass, dirt, and rock. With a devious grin, Aria dropped down onto her knees, shaking the earth on impact. She held Sci-Twi firmly, her gargantuan fingers digging into Sci’s flat, compact little ass as she rammed her.

Now, on the ground while Aria slammed into the towering nerd between them, Sunset decided was the time to really give it to her good friend; She very gently removed Sci-Twi’s glasses and set them aside, before grabbing a small forests' worth of silky purple hair in each hand. Sunset rocketed her hips, pounding at the back of Sci-Twi’s tight, convulsing tunnel of a throat, her feet digging trenches into the dirt beneath her from the force of impact. Rivers of drool trickled out of the corners of Sci-Twi’s mouth, mingling with sweat from Sunset’s chiseled physique and flooding onto the grassy hill below.

Sci-Twi had thought that, with her new size, she wouldn’t feel quite so minuscule when compared to Sunset and Aria, but she couldn’t be more wrong. Aria was entirely correct when she compared her and Sunset to giant monsters, their already supernatural size and strength having grown exponentially through the embiggening process. She could feel the bulging tension in Aria’s muscular arms as she gripped her hips, not to mention the pulsing, throbbing, pistoning of Aria’s cock drilling through her. With how deep she was going, Sci-Twi was beginning to worry that Aria’s dick might somehow reach Sunset’s, regardless of how little sense that made from an anatomical perspective.

“Ow! Aria, ease up, will ya?” Sunset pushed herself up slightly, swatting some of the hill's remnants from her butt. “I think I sat on a tree or something.”

“Fine, ya big baby. Here, let the nerd breathe for a sec, I’ve got an idea,” said Aria, finally pulling away from Sci-Twi’s tight little pussy. Sunset obliged, and pulled her sticky, sweaty pillar from Sci-Twi’s mouth. Strings of drool connected Sunset’s equipment to Sci-Twi’s lips and throat, and the scientist quickly coughed and hacked another deluge of throat slime onto the ground. “You holding together, poindexter?”

“No wonder you have so many sexual partners… There’s too much… girth,” coughed Sci-Twi. “I can feel your penis touching my heart…”

“Heh. Don’t go falling in love with it yet, you’re gonna have to fight my sisters for it.”

“Oh, and yours is very nice as well, Sunset.” Sci-Twi let out another cough, and wiped the strings of drool and cock sweat from her features. “I just, you know… Couldn’t breathe.”

“Unlike some people, I don’t need my ego stroked in order to nut,” said Sunset, rolling her eyes. “Just a nice, tight throat. Speaking of…”

“Oh, yeah. My idea.” Aria sort of flopped backward, dropping all of her weight onto the ground. She laughed maniacally as the grassy plains cracked under her mass, leaving a distinctly-muscled outline into the earth. With one hand, she gripped Sci-Twi’s cute little butt and, with the other, held her own cock at attention, the appendage itself taller than some houses. “I figure the nerd can ride me, and then you can stand and fuck her face up.”

“Fine by me. Sound good, Sci?”

“Y-yeah, sure. Just, quick question…” Sci-Twi blushed slightly, shrinking down in some futile attempt at hiding from her own embarrassment. “When you say ‘ride you’, what exactly are you picturing?”

“Oh, she’s adorable. Can we keep her, Shimmer? Can we?” Aria sat up and grabbed Sci-Twi in her powerful grasp, squeezing her around the hips tightly as she lined them up; Sci was faced away from Aria and, as such, had no warning when those powerful hands strayed from her hips to her hair. Aria gripped Sci-Twi by the ponytail and, with a powerful tug, brought the scientist down to be impaled by her monumental cock. “Fuck yeah…”

By some instinct, perhaps memories flashing of those trashy erotica she denied reading, Sci-Twi bounced on Aria, slamming down onto the muscled Siren’s hips with the apparent intent of caving in the ground beneath them. Sunset took her opportunity to stomp over and slide her own spire-like cock into her friend. Sweat dripped from her toned, powerful body, cascading down to the ground like a storm as she slammed her pelvis against Sci-Twi’s cute button nose.

As she bounced, feeling Aria’s unreasonable length burrow a path through her insides, Sci-Twi let her hands wander between her legs, rubbing her clit in time with Aria’s deep, unrestrained pounding. A blossoming heat surged through Sci’s body, her body quivering and her pussy tensing around Aria. She was close, and based on the increased fervor from the cock on either end of her, she wasn’t alone.

Sunset came first, her thick, veiny cock spraying gallons and gallons of hot cum down Sci-Twi’s throat. A groan escaped Sunset, and she wrapped her impossibly strong arms around Sci-Twi’s head, keeping her in place as she filled her belly with a small lake’s worth of jizz. Try as she might, Sci-Twi just couldn’t swallow it all, and cum soon filled her mouth, and it broke free of her lips to drip down her chin even quicker.

With the flooding heat, the satisfying spurts down her gullet, not to mention Aria’s pillar slamming into her, Sci-Twi couldn’t help but squeal around Sunset’s fat cock as her orgasm hit her. Her cunt gushed and tensed, her entire lower body quivering in delight, which proved to be too much for Aria. She gripped Sci-Twi by the hips and slammed her down, holding her in place to deposit her load. Tidal waves of cum flooded into Sci-Twi’s embiggened womb, her already full stomach seeming to swell with each additional surge of cream. Sci-Twi went limp, and she fell forward onto the ground when Sunset finally released her grip on her friend. There was a thud that was surely felt in the distant city when Sci hit the dirt, and that thud was followed by a low, rumbling moan of satisfaction.

“So, if I understand this correctly, we should start shrinking back down in like fifteen minutes?” said Sunset. Sci-Twi gave a weak, unsteady thumbs-up in response. “Right. So… What now?”

“This might be kinda embarrassing but eh, fuck it,” said Aria with a shrug. She swatted Sci-Twi’s flat ass, leaving a visible palm print in her soft, smooth flesh. “When we’re small enough to fit in a restaurant, you wanna let me take you to dinner? So I can fuck you again after, I mean.” Aria saw Sunset’s disapproving head shake, and she sought to amend her statement. “Sorry. Respectfully. Will you let me fuck you again respectfully. Not trying to be rude.”

Sci-Twi opened her mouth to respond but, instead of words, let out a hacking cough. A mudslide of Sunset’s cum sprayed out of Sci-Twi’s poor, abused esophagus, going forward for yards. She coughed again, this time only shooting out a small spattering of she-cream before laying her head down to rest. Aria looked to Sunset and shrugged.

“I’m taking that as a yes.”

Trixie frowned as she stomped her way over to where Sunset had gone, beyond annoyed with herself. Truthfully, it didn’t bother her that Sunset had sex with other people. She understood that a cock like Sunset’s simply could not be tended to by a single person, even a wizard as amazing and fantastic as Trixie herself. No, what bothered her was that she hadn’t been invited to at least watch. While there was no substitute for being destroyed by Sunset’s massive cock, observing someone else be destroyed was still good fun. So, if no one would invite her to watch, she would just need to invite herself. Wouldn’t be the first time.

“How far did those freaks even go?” Trixie asked no one as she bounded over another hill. She was certain that Sunset thought that she was staying relatively near, but she underestimated the length of her new truly gigantic size. “Ah, there’s my girl. Looks like Trixie missed most of the excitement…”

Sunset had clearly just cum, evident by the glistening sheen of sweat that clung to her chiseled physique as well as by the thick ropes of cum that connected her delectable cock to Sci-Twi’s lips. Trixie could hear Sunset speaking by her rumbling, booming, thunderous voice, but she was too far away to really tell what she was saying. No trouble, all she had to do was spring up and get Sunset’s attention. Should be easy for someone as loud and bombastic as Trixie.

The ground quaked as Sci-Twi’s body hit the ground, knocking Trixie flat on her butt. The ground continued shaking as Sci-Twi moaned, making it impossible for Trixie to make it to her feet. Before she could figure out what was going on, the ground quaked again, this time bringing more than just a rumbling of the ground beneath her; Trixie’s eyes went wide as a flood of sticky, off-white fluid gushed from Sci-Twi’s throat, headed straight for her.

The cum crashed onto Trixie, wiping her out like a wave to a surfer. She tumbled over, fighting against the surge of semen with all of her might until, finally, the flood came to a stop. Trixie stood up, the thick goo giving her much trouble, and tried her best to clear the cum out of her eyes. She managed to wipe a fair bit from her face, but there was so much clinging to her body, matting down her hair, and completely coating her, that there was no getting rid of it without a few showers. In fact, it was almost as if she had been bathing in the cum, soaking in a bathtub of her girlfriend’s lady-jizz.

Trixie licked Sunset’s cum from her face and smiled from ear to ear.

“My skin is going to be so soft!”