Dinky Doo's Big Adventure

by AzureDreamer

First published 30th of August, 2015

Dinky has a very big problem on her hands (this is innuendo by the way)

ALL CHARACTERS ARE 18 OR OLDER.

Dinky is a good kid. She gets straight As, respects her elders, hangs with mostly the right crowd, doesn't do drugs, and is still a virgin. Sure, a lot of guys want her, but her deep-seated anxieties about teen pregnancy lead to her turning them all down. It's not like she can't live without sex until she's got her own life in order, right?

At least, that's what she thought until she discovered a certain extra something she'd inherited from her mom.

A big extra something.

A very big extra something.

A very big extra something that wasn't there before.

And she could swear it was getting bigger.

WARNING! CONTAINS ANTHROS, FUTA, FUTA ON MALE, FUTA ON FEMALE, HYPER, PENIS EXPANSION, AND A SHITTON OF OTHER WEIRD STUFF

Cover art by airship-king, colours by 09hankris!

Consider donating to my patreon to fund more stories like this!

Diner

Dinky Doo was the result of a teen pregnancy. It was a late teen pregnancy and it hadn't interfered with her mother's schooling, but the knowledge of her origins had left her cautious, and maybe a bit neurotic. Or, as Carrot Top liked to put it, uptight. “Just don't go bareback when you fuck. Have a bunch of sizes on you just in case, and worse comes to worst, there's always blowjobs.” Dinky took Carrot Top's advice to heart, in a sense – she always made sure to have condoms readily available, though she never intended to use them. She was perfectly happy not having sex until her life was somewhat sorted out, or at least that's what she told herself. That didn't stop ponies from assuming that she and Rumble were dating, though.

“It's insulting! I mean, what, I can't be friends with a colt without being his marefriend?”

Noi shrugged. “Don't look at me, I kinda always assumed he was gay.”

“I'm pretty sure he is, but that's not the point!”

“Why are you even talking to me about this.”

“Because shut up and let me complain at you.”

Noi raised an eyebrow and took a sip of her hay shake. “Look, it's high school, and you're popular. Just be glad the rumours are about you fucking a cute guy and not about you fucking teachers for better grades or something.”

Dinky slumped forward onto the table sulkily. “Guh. At least there's less than a year of this petty nonsense left.”

“Yep.” Noi gestured with a hay fry. “Then it's college and y'all gotta deal with four years of slightly different petty nonsense.”

“Please don't joke about that.”

“Ain't jokin'. Petty bullshit's pretty much a constant theme of schooling. Remember elementary school when I looked at Snails once and everyone decided we both have cooties even though I'm the faggiest fag to ever eat a pussy?”

“Noi, come on, we're in a family restaurant. Don't get us kicked out again.”

Noi shrugged. “I'm gay so it's okay if I call myself a fag. You gonna eat that?”

Dinky half-heartedly looked up at her... whatever relation Noi was to her. Noi was Carrot Top's younger sister and Carrot Top was Dinky's mom's significant other. According to Noi, this made her Dinky's aunt, purely because she knew it annoyed Dinky. Regardless, they weren't related by blood, which Dinky was secretly grateful for. Noi's figure was nowhere near as generous as her sister's, but it was still above average. Her breasts were sizable – but still in the common alphabetical range – tapering to a trim waist before flaring out into a respectable ass. As far as Dinky was concerned, Noi was just fine as she was, though she could understand why she'd feel jealous of her older sister. Anyone with that as an older sibling would feel inferior. Which, Dinky supposed, explained the piercings. Multiple studs in both ears, her nose, her eyebrow, and her lower lip, and that was just what was visible without removing clothing. Dinky idly recalled the time Noi bragged about having gotten her clit pierced, which led to her imagining what that might be like.

Dinky buried her face further into her arms in an attempt to hide her blush. “Yeah, just gimme a minute.”

“You need to lighten up, Dinky,” Noi said, her words muffled by the food she hadn't bothered to finish chewing before speaking. “Like, you're always hung up on how your mom got preggers with you in high school but, like, it's not like it ruined her life or anything. She's got a good career and shit, so I don't see why you're so fuckin' hung up on it.”

“Please don't psychoanalyze me. It's really weird.”

“Ain't psychoanalyzing, hon, 's just that I've known you for years. I know how your weird little brain works inside and out.”

Dinky rolled her eyes, still cradling her head in the crook of her arms. “Yeah, well, I know your brain enough to know when you're talking out of your ass.”

“You sure you're gonna eat that? 'cause, like, I'm already done my fries 'n shit, and it'd be a waste to-”

“Yes I am going to eat my fries.”

“Okay, okay, sheesh, no need to bite my fuckin' head off. Just kinda wanna get goin'. 'Cause I've kinda finished my food and these booths aren't very comfortable for long periods 'n shit.” Noi punctuated this by locking her fingers together and flipping her hands away from her body before lifting her arms above her head and stretching, which had the side effect of violently thrusting her chest out. The action drew Dinky's attention to what Noi was wearing, or rather what she wasn't wearing – she didn't have a goddamn bra on, again, as was made obvious by that eight year old white tank top that she refused to throw out even though it didn't even remotely fit her anymore. Her nipples were clearly outlined against the thin, tight cotton, and her sizable breasts were squashed flat, tantalizing lumps oozing out of the sides of the top.

Dinky got up, her eyes darting sharply to the right. “Look, I've gotta go to the bathroom.” She tossed a wallet onto the table. “Here, pay for the food and I'll eat my fries on the way home. And try not to give anypony an eyeful. Again.”

“Hey, these girls were meant to be free! Cagin' 'em up'd be a crime against nature!” Noi shouted after Dinky as she went to the bathroom.

“Fuck,” she muttered, dashing into the handicap stall and slamming the door shut behind her. She was going to need the extra leg room, and it wasn't like there was anyone who might legitimately need it. She yanked her skirt down and flopped back onto the toilet, not bothering to lift the lid.

God, her panties were fucking soaked.

“What the fuck is wrong with me? Am I seriously about to just masturbate at the drop of a hat in a public bathroom? To my fucking best friend?” She violently pulled her panties down.

“And your sister. Technically. I mean, I joke about it, but I don't fuckin' know what we are to each other, familially speaking.”

“Fuck.”

Dinky couldn't see her – the door to the stall was closed and Dinky didn't have x-ray vision – but she didn't need to in order to picture the shit-eating grin on Noi's face.

“How did you-”

“I have a nose, Dinky. You reek of fucking canned tuna.”

“Oh.”

“Can I come in?”

“No.”

“I'm comin' in.”

“Go away, Noi!”

“Hold on, I'm just gonna – Okay, maybe not. Looks like someone pissed on the floor. Who the hell does that in the girl's room? That's only supposed to happen in the guy's room. Ew.”

Dinky groaned, and buried her face in her hands. “Please go away, Noi.”

“Nope. If I can't crawl under, I'm gonna climb over.”

“Oh my god.”

“Hup! Wait shit no fuck-” There was a thud from outside the stall, and Dinky groaned again.

“For fuck's sake, Noi...”

“Wait, no, I'll try again.” There was the sounds of struggling and then another thud.

“Okay, okay, fine. You can come in. Fucking hell...” Dinky unlocked the stall, and Noi awkwardly stumbled in.

“Don't tell anyone about that, okay? As far as anyone knows, I climbed in successfully the first time and it was cool and awesome and badass and shit.”

Dinky rolled her eyes. “Yeah, I'm just gonna tell everyone about that time you barged in on me in a public restroom as I was about to start masturbating to you. That sounds like a great fucking plan.”

“Uh, yeah.” Noi scratched the back of her head. “'bout that.”

“Yeah. Sorry about that.”

Noi awkwardly waved her hands around. “No! No, it's okay! Really! You aren't the only person I've ever caught jerkin' it to me!” Dinky groaned as Noi hefted her breasts. “Like, lookit these puppies. I'd jerk it to me. 'm not mad at you or anything. 's just-”

“Weird?”

“Nah. I mean like yeah, okay, it's technically incest,” Dinky groaned again, “but only technically. 's not like we've been related by marriage long enough for it to be weird or anything. An' we're only related by marriage, soooooo-”

“Noi please stop you sound like some kind of weird Neighponese porno.” She slowly stood up, reaching down to pull up her skirt, only for Noi to put a hand firmly on her shoulder, pushing her back down.

“Hold up, Dinky.”

“Noi, if we're going to be having an actual conversation about this, I'd rather at least not be sitting on a toilet with my skirt around my Noi what the fuck are you doing.”

Noi had gotten down on her knees, putting herself eye-level with Dinky's soaked panties. “Makin' sure I don't leave my best friend with blue balls. Metaphorically speakin'. 'sides,” she said, leaning in closer, “been wantin' to fuck ya' for years.” With that, she shoved her face into Dinky's crotch, inhaling deeply. “Man, y'all smell good.”

“Noi, nggggg, that's weird.” She weakly pushed at Noi's head in a futile attempt to stop what she knew was going to happen immanently. “Please stooooooooopnggggh.” Dinky's hands involuntarily clench themselves into fists as Noi bites down on her panties, gently pulling them down and out of the way.

“Nope, sorry hun. You want this. Don't lie to yourself, you've wanted this shit ever since puberty.” She stands over Dinky, glaring down lasciviously. “Lotta ponies would wanna be in your place right now, slut. 'course, if y'all don't wanna admit to yourself that just the thought of gettin' eaten out by the mare of your dreams is almost enough to make you cream yourself on its own, howzabout we put your pretty little mouth to better use instead.”

She unbuttons her jean shorts and slowly unzips them, letting them drop to the ground, revealing that in addition to the lack of a bra, she also isn't wearing panties. “Suck,” she says, gesturing at her cock. Dimly, Dinky realizes that that wasn't there before, but then the musk wafting off of the two-and-a-half foot equine member. The bathroom stall is soon filled with the overwhelming stench of sex, drowning out Dinky's thoughts with its sheer intensity. “Suck my cock, bitch. Now.”

She doesn't need to be told twice. She collapses forward onto her knees, shoving her face into Noi's limp cock and letting its powerful masculinity overwhelm her senses. “That's more like it, slut. You like that? God, you're a fucking freak, ain't'cha? You act all uptight and proper and shit but give you a big ol' cock and you're just a quivering mess on the floor. Pathetic.” She roughly grabs Dinky's head with both hands. “Now get my cock into your mouth before I start getting hard.”

Dinky's mind swims, overwhelmed by lust. She stares at the gigantic beast of a penis, bright pink mottled with brown splotches along its length, and it fills her very being. It's all she can think of. “Cock,” she mutters to herself once, and then again. “Cock.”

“What? Dinky, you... you doin' okay? You've been kinda out of it since I,” her sentence trailed off into nothing. Noi blushed as what she'd almost done sank in. “Look, I'm sorry. Really. Just because I know you've got a crush on me doesn't make it cool for me to just eat you out in a public bathroom.” She sheepishly rubbed the back of her head. “I guess I should prolly leave and let you, uh, deal with things, and we can talk about this properly at home?”

No response besides some heavy breathing.

“You, uh, you sure you doin' okay, Dinks?”

“Coooooooooock.”

“Gah what!” Dinky slumped forward onto her knees, shoving her face into Noi's crotch, tongue lolling out lazily as she licks at Noi's flaccid length, getting it nice and lubricated before she swallows it to the hilt in one go. “Good slut. You'd think you've done this before. Fuck, lotta ponies probably don't need to see you suckin' cock like a pro to think that. They just look at you and know that whole prim and proper virginal honour student act you put on is bullshit. You're nothing but a repressed little cumslut just aching to shove the first cock you can get your little whore hands on down your throat. And the next one after that right up your tight little asshole. Isn't that right, Rumble?”

If Dinky's mind wasn't incapable of coherent thought at the moment, she would have realized that Rumble hadn't been there up until that moment. Instead, she just shifts her position so she's on her hands and knees, raising her tail high to give the colt easy access to her two free holes. “Good girl,” he says, gently scratching at the small of her back before grabbing her asscheeks firmly and spreading them apart to reveal his prize. “I've always wanted to fuck your asshole. I mean, you're so fucking uptight, it's gotta be like a fucking vice in there,” he says, rubbing his cock back and forth against her belly, letting her gushing cunt provide lubrication. “And since you're greedy enough you took Noi all the way to the hilt in one go, I figure it's only fair I give you the same treatment back here!” With that, he pulls his hips back, and then thrusts forward, plunging his girth into her asshole in one fell swoop.

“GnghhhhAAAAAAAAAA!” Dinky screamed in ecstasy into Noi's crotch, her jean shorts soaked through with Dinky's saliva on one side, and her own fluids on the other.” She gently grasped Dinky's head to steady herself, panting heavily.

“Holy shit, Dinks, if you wanted to eat me out instead, you coulda just said so. Kinda gonna be tough to do it through my pants though. Gimme a sec here...” She made an attempt to pry Dinky from her clothed cunt so she could remove her shorts, and failed miserably – between her face being pressed tightly into her crotch and one hand having a death grip on her plush ass, and her own limbs being weak from arousal, she didn't stand a chance until Dinky's free hand worked its way into her panties and she began to chant “cock” again.

“Coooooooooooooooock,” she moaned, as Noi took the opportunity to remove her shorts. “Cockcockcockcock cooooooooghhhhh.”

“Yeah, that's what you're good for, slut. Suckin' cock and getting fucked.” Noi grunts as she thrusts her now fully hard cock in and out of Dinky's face, while rumble does the same in the rear. Dinky is only capable of vague gurgling noises as her face and ass are fucked relentlessly by her best friends. “You're so good at this, slut. Gonna cum any second now. Mmmmm, I bet you'd love this. Havin' a big ol' fucking cock of your own, not havin' to rely on the generosity of other folks to get your fix.” She groans, deep and guttural and primal, as her cock swells bigger inside Dinky's throat, and Dinky's horn began to glow with a dull gold aura.

“Coooooooooockkkkkkkkkkkk,” she moaned, deep and guttural and primal, as her magical aura spread, enveloping her pelvis in a warm glow.

“Just picture it. Big and thick and hard.”

“Biiiiiiiiig, mmmmmm, thick and haaaaaaaaardnnnnnggggggggg.”

“And what's a cock without balls? Huge balls, full of cum.”

“'n ballssssssssssssss, fulla cummmmmmmmmmmmmmm, so much fucking cuuuuuuuuuuuuummmmmmmmm.” The golden glow intensified and concentrated, slowly flowing until the whole mass of magic was concentrated on her crotch.

“Of course, that wouldn't be nearly enough for you, would it, slut? No, just big won't do. You need bigger, and bigger and bigger and bigger until it's so big you can't possibly hide it any more. Until everyone who looks at you can see that all you're good for is fucking with your monster cock.”

“BiggerbiggerbiggerbiggerbiggerbiggerBIGGER-” Dinky's magic pulsed, pushing her hand out of the way as it swelled and shifted shape, going from a vague blob into a cylinder that her hand quickly wrapped itself around, pumping up and down furiously.

“Uh... Dinks?” “Yes, that's it, whore. Cum for me.”

“CoooooooooooooCKFUCKKKKKK.”

Dinky came, hard. Hard enough that her panties couldn't contain the force of her orgasm; gout after gout spurted through her tented panties, painting the floor with thick, sticky fluid. It felt amazing. Like nothing she'd ever felt before, an explosion of pleasure, wild and uncontrolable. The strength left her body, and she collapsed backwards onto her ass, legs splayed out to her sides as she rode the crests of orgasm after orgasm after mind-blowing orgasm, gout after gout of cum rocketing straight up from her brand new, ten inch long horsecock.

Darkness encroached from the edges of her vision, and slowly she felt herself losing her grasp on consciousness. With one last weak moan, she passed out.

Author's Notes:

Sorry this took so long, folks. I'm hoping to keep the next few chapters coming out at a decent enough pace at least.

Assignment

“Okay, so, important stuff first. She ain't gonna die, right, doc?”

Doctor Horse nodded, and Carrot Top continued; “And it's not, like, anything serious. No terrible magical disease or disorder or some other weird unicorn thing that's going to make Dinky's life miserable forever?”

“No, she'll be fine. Just have to deal with an extra appendage for a while.”

“How long is a while? Because Derpy'll fuckin' kill me if it's anything important.”

“It isn't, I assure you, Mrs Hooves.”

Top frowned while Dinky awkwardly twiddled her thumbs, sitting on the exam table. She was currently only wearing a hospital smock, naturally one size too small, with a conspicuous tent in the groin area. She looked down, blushing. “You're absolutely sure, then? It's going to go away eventually?” He nodded again. “Okay, then, when? Gimme a fuckin' timeframe to work with.”

“Ah, yes. Unfortunately that isn't something I can do.”

“Why the fuck not?”

“That would have to do with the nature of what exactly happened to Dinky.” He handed Carrot Top some papers. “The short answer is that it's a 'weird unicorn thing.' The long answer is that it has to do with puberty. As you know, ponies of different tribes have different things happen to them in addition to the standard growth and development of secondary sexual characteristics. Mostly to do with their particular tribe's magic. What's happening is... somewhat complex. Far too complex to really warrant going into detail, especially since you've almost certainly learned this yourself.”

Top shrugged. “Back in, like, middle school. I don't see what this has to do with Dinky growing a cock all of a sudden.”

“Well, a simplified version is that every pony has his or her own reservoir of magic, that's channelled in different ways depending on the tribe. Earth Ponies get enhanced physical strength and endurance, Pegasi get flight and weather manipulation, Unicorns get magic. Here, take a look at this diagram.” He put a finger on the paper he'd handed to Top. “As they go through puberty, a Unicorn's magic channels develop and grow. Think of it like baby teeth versus adult teeth. And, much like teeth growing in, it can result in some... growing pains.”

“Like the cock?”

“Yes, actually. In infancy, and then later near the end of puberty, Unicorn magical channels expand, which leaves the young Unicorn with sudden access to a much greater flow of magic, which can result in them randomly casting very powerful spells with or without meaning to, often more powerful than they will ever be capable of casting for a very long time or even ever again. It isn't entirely random, but triggers can be unpredictable. In Dinky's case, having her first real sexual experience was an intense enough experience that it triggered a miscast that resulted in, well.” He coughed, pointedly not looking at the dark spot that was spreading on Dinky's smock. “Anyway, the point is that unfortunately, without running further tests, we can't determine exactly what it was that Dinky's magic did. Tests that Ponyville General Hospital doesn't actually have the equipment to conduct. Short of sending her to a specialist in Canterlot, which would be... not cheap at all, there's not much we can do for her for now.”

“You're sure? There's nothing y'all can do?”

“We could forcibly terminate the spell, but doing so without knowing what it actually is could lead to serious negative developmental effects for Dinky.”

“How negative are we talking?”

“Completely burning out her magic channels leaving her incapable of Unicorn Magic short of getting a prosthetic horn. Which would be even more expensive than sending her to a specialist.”

Carrot Top winced. “Okay, yeah, let's not do that.”

Doctor Horse nodded. “Fortunately, there is one thing I can say for certain. Whatever spell Dinky subconsciously cast on herself, it very likely isn't permanent. The penis isn't illusory, and is fully functional. Physically, she is functionally both male and female. That kind of transformational spell would already be fairly advanced. For it to be permanent would require either her to have a special talent conductive to permanent physical alteration magic, or an alicorn magical reservoir capacity – in layman's terms, Dinky would either need to specialize in alteration magic or have access to nearly twenty billion times the magical energy that she does now in order to brute force it.”

“Okay.” Carrot Top nodded. “So all we can do is wait, then?”

“Yes, unfortunately. I'll see what I can do, but there's a very real chance it will go away on its own in the meantime. For now I'd recommend having her take some time off of school. She needs to get used to having a penis, and there's the very real possibility that another misfire could occur. Limiting her exposure to other ponies will hopefully help lower that risk.”

---

Dinky frowned downwards. “Come on, you stupid thing. Go down so I can get dressed.” Her cock, achingly hard, merely twitched in response, a bead of precum forming on the urethra. “Fuck.” She flopped backwards onto her bed, trying very hard not to cry. “I'm not gonna give you the satisfaction of jerking off you stupid... fuck.” Her mother had lent her some of her underwear – enchanted to hide her own extra appendage – to wear so she could be around other ponies without sporting an obvious bulge that hadn't been there before.

Unfortunately, the magic didn't work unless you first got the panties on. Which was proving difficult, between the raging erection that refused to go down no matter how hard she thought unsexy thoughts, and the fact that her mother's hips were significantly wider than her own. “Come on, school's already over and Miss Cheerilee would have sent someone over with my homework and notes and shit. I need to get dressed before they get here, which I can't do if you don't fucking go soft already for fuck's sake.”

It twitched again. Dinky grunted, partially out of frustration, but mostly because it felt so damn good. She buried her face in her hands (mostly to give them something to do other than slowly drifting to her crotch) and groaned. “They'll be here any minute! Just go down you've been hard all day and I haven't seen anything sexy at all!” Strictly speaking, the last time she'd seen anything she'd consider sexy, she'd grown a cock.

“Fuck it, I don't have time for this.” Even if she were to masturbate, it was doubtful she'd even cum before whoever Cheerilee sent arrived. She pushed herself upright, slumping over and blearily scanning the floor of her room. Usually it was much neater than this, but she'd been getting lazy about using the laundry hamper. And the thing had been keeping her awake at night, the painful arousal too much for her mind to be able to relax. There, in the far corner, was the only pair of pants she'd worn for the past few days – grey, tatty sweatpants that had once belonged to Carrot Top. They had been slightly baggy on Top, but on Dinky it was like wearing a circus tent. There was no way that her cock was big enough to produce a noticeable bulge while she was wearing those. Dinky put a hand on either side of her body, lowering her torso slightly before pushing...

“Hey, Dinky! Mith Cheerilee thent me with todayth noteth and homework!”

... but before she could so much as get off of her bed, the third worst possible pony Cheerilee could have chosen barged into her room.

“Oh, hey, you're a futa? You should have thaid thomething thooner, maybe we could have had thome fun!”

“Graaaaagh!” Dinky flopped backwards onto her bed again, not even bothering to scramble to hide her new stallionhood. It was too late. Twist had already seen it. Of course the pony who brought her her classwork for the day would be the biggest slut in school. “I don't suppose I could convince you to just put it on my desk and leave?”

“Dependth on how contagiouth you are.”

“Ugh.”

Twist smiled warmly, sitting down on Dinky's bed next to her. “I'll take that ath a 'not contagiouth at all.' It'th been almotht a week thinth we've talked, Dinky! I wanna know how you're doing!”

It wasn't that Dinky disliked Twist. Parsing her lisp could be a pain, but it just took a few moments to get used to before you started to mentally filter it out. And aside from that, there was very little about her not to like. In fact, Dinky mused as she pushed herself into a sitting position once again, Twist was probably one of her closest friends. Normally she wouldn't have any problems with getting to quickly catch up on the latest gossip, but in this situation, Twist was decidedly not someone she wanted to see for several obvious reasons. She glanced sideways, taking in the reasons. They were large, half again the size of her head, perfectly firm. Twist claimed they were the result of a glandular condition combined with a very generous puberty, but Dinky wasn't entirely sure they weren't the result of cosmetic surgery. Or possibly cosmetic sorcery. Either way, the only reason that Twist's enormous breasts were credible to Dinky was that Top's were bigger, and she knew they were natural.

Throughout elementary school and into high school, Twist had been short and scrawny. The only attention she ever really got, aside from her two or three friends, was from Diamond Tiara and Silver Spoon making the occasional snide comment. And then one September she showed up on the first day of school completely transformed. She wore the same outfit she always wore – a plain white t-shirt coupled with denim overalls – but suddenly she was a good two feet taller, and the shirt barely covered the top third of her gigantic tits, let alone her nipples. Combined with the also-much-too-small-for-her overalls, and she might as well have not been wearing anything. She had been sent home, of course, and had come back the next day with slightly less revealing clothing, but the damage had been done. Twist had gotten a taste of the positive attention that her new assets brought and discovered it to be to her liking. She didn't own a single outfit that didn't show off a good amount of fur, as far as Dinky was aware. And she had absolutely revelled in the attention her breasts brought to her. In all of its forms.

She took pride in having sucked every single cock, male or female, that she was aware of in Ponyville High within the first month of tenth grade.

“Hm.” She reached down and gave Dinky's cock a firm squeeze, eliciting a shocked gasp. “Decent girth. Decent length. For a stallion. I don't wanna be mean, but you're really small for a futa.” She strengthened her grip and gave the cock a good, solid pump. “I mean, Silver's got the smallest futa cock I've sucked and even she's just under two feet hard.” She reached over with her free hand and scooped up some of the copious flow of pre Dinky was leaking. “Production's nice, at least. Nowhere near as much as Miss Cheerilee, but her cock's as big as I am so that's not really a fair comparison. Still, let's see about taste.” She brought the precum to her face and gave it a lick. Her eyes widened slightly behind the thick, purple rims of her glasses, and she dove in, greedily lapping up the small pool of cum before licking her hand entirely clean. “Holy shit, that's good! I've never tasted futa cum so fuckin' manly, and that's just pre!” With the practised motions of an expert, Twist moved from beside Dinky to on the floor in front of her, not once pausing her handjob. She brought her face in close, her hot breath sending aches of arousal through Dinky's body. Pale golden sparks shot out of her horn in time with the pulses of heat travelling up and down her spine. “Mmmm, hurry up'n cum so I can get a taste of the real thing.” Without another word, Twist took the cock into her mouth, up to the hilt in one motion.

Dinky's body tensed, and she came. Hard. Harder than the first time she had came, her hips thrusting powerfully into Twist's mouth on their own, like she was attempting to force more of her cock into the hot embrace of Twist's tight throat. Instinctively, she reached down and grabbed two handfuls of curly red mane, to more effectively fuck Twist's face. Gout after gout of hot seed spurted from her cock, far more than her walnut sized balls really should have been capable of producing.

After what felt like hours but was more like half a minute, Dinky felt her orgasm begin to lose momentum. Slowly, inch after agonizing inch, Twist pulled her head back, the sensation drawing Dinky's climax out and out, along with Dinky's cock. All ten inches of it, and then more. Twist reached up, giving her now plum-sized balls a squeeze with one hand, and grasping the base of her cock with the other, gently pumping it as a grin spread across her face – she could no longer fully close her hand around its girth. Eventually, the head popped out of Twist's mouth, splattering two last gouts of cum across Twist's face. She let go of it, and its now fifteen inch length, still rock hard, slapped against Dinky's chest, staining her fur with the dregs of orgasm.

“Delicious.”

“Holy shit!” Dinky shouted between the heavy pants of afterglow. “What the fuck?!”

“Your cock grew,” Twist replied matter-of-factly. “About five inches, I'd say.” She rolled her eyes at Dinky's panic. “You're acting like that's weird. Most stallions I've done do the same thing. Hell, Pip's cock goes from five inches to three feet when he cums.” She licked her lips wistfully, catching a bit of Dinky's cumshot. “Mmmm, he's a bit of an extreme example though. Five inches is much more normal.”

“So... it's supposed to do this?”

“Prolly. And hey, now you're big enough for a proper titfuck!”

Dinky blushed. “Twist, I don't know. This feels weird.”

“Hey, relax. It's all good fun. Hey, wanna see something cool?”

Before Dinky could either object or consent to seeing something cool, whatever that might be, Twist leaned back, spreading her legs. She rested on one hand, the other moving forward and gently rubbing the soft swell of her pussy, clearly visible under her thong. “See, a lotta folks don't know a lot about Earth Pony magic. You get strong, you get tough, that's about it. But, see, waaay back in tenth grade when these babies happened, I looked it up and there's more to it. And it turns out that yeah, there's more to it. Like, you know how all of the Apples are built to hell and back? That's an Earth Pony magic thing, too. And, like, Earth Pony families are always huge? Same thing. Turns out Earth Pony magic is all about fertility. That's why we're so good at farming and shit. Which basically means that, once you know what you're doing, you can do stuff like this!”

There was a creaking sound, and then a snapping sound. “There goes the bra. Normally I don't do this with a shirt on, but it's more impressive this way. You might wanna duck, by the way.”

“Wha-” Dinky quickly dove to the floor, leaving her face-to-barely-covered-by-her-thong-pussy with Twist as the buttons on her top, a sleeveless midriff-baring affair popped its first button. One by one, the already straining buttons snapped, until her shirt burst open, unleashing her breasts from their cloth prison onto the world and Dinky.

“I mean, it's not much growth. Just about enough to bust a bra and a shirt. But once I get good at it, I'll be able to make these puppies bigger than me!”

“What.”

Twist grinned. “The point is that you're not the only one with weird stuff going on, Dinky. Just relax and lemme give you a nice titfuck.”

Dinky groaned in exasperation. “Twist, look, I'm not... supposed to be doing this kind of thing until the doctors figure out where this thing came from, and now it's bigger and it's still hard and this is clearly not normal, despite whatever you've got to say about Pip and your boobs and whatever.” She pushed herself into a standing position. “Look, just... put my homework on my desk and- I don't know, okay, this feels weird and wrong and-” She found her eyes insistently darting their way back to Twist's bare breasts, each now twice the size of her head. Her nipples, erect and swollen, leaked a steady stream of sweet-smelling translucent fluid. “... Are you sure I'm big enough to, you know? I mean like your, um, your breasts are pretty big and, um.” Dinky blushed.

“You're cute when you're flustered.” Twist got up. “Look, even if you're not quite big enough for a proper titfuck, we can still have a little fun. Just sit down on the bed and we'll get going. Don't worry, I'll take the lead, you just have to sit back and enjoy yourself. If I tell you to do something, do it, otherwise just relax. You're to tense!”

Dinky, awkwardly blushing, sat down on her bed once more. Twist approached her, getting down on her knees. “A titfuck's pretty simple. Hup!” She hefted her breasts and plopped them onto Dinky's lap. Their sheer size meant that they more than filled the available space, spilling onto Dinky's bed. She gasped as suddenly her cock was surrounded by soft, warm titflesh. “Grab my boobs, Dinky.” Awkwardly, Dinky manoeuvred her hands to either side of Twist's tits.

Twist gently took her hands in her own, and pressed them inwards. The sudden increase in pressure drew another gasp from Dinky. “Ohfuck.”

Twist grinned. “Yeah, normally if my tits were smaller or if your cock was bigger, I'd be able to give you oral as well, but honestly? Turning my tits into a makeshift cunt is way fuckin' hotter.” She pressed Dinky's hands into her flesh more forcefully, and began to move them up and down. Slowly at first, but quickly picking up in intensity.

“Ohfuck,” Dinky grunted, her voice strained. Her mind swam with confused arousal. This was wrong. Twist was her friend, and yet here she was, mindlessly fucking her like an animal. Her horn began to sputter again as she groaned. She'd never looked at Twist as anything other than a friend before, but now...

She looked down at Twist. Now she was a pair of giant tits giving her a titfuck and fuck it felt so damn good. “Ohfuckohfuckohfuck gonna get biggerrrrrrrrrrrr!” Her horn sparked, an explosion of golden sparks raining down as she came. And then came again.

And again.

And again.

And with each orgasm, her cock pulsed larger. Cum splattered all over her thrusting hips from the gap where her cock entered the tight embrace of Twist's tits, and all over the ceiling as her cockhead quickly erupted from their embrace, much to the surprise of Twist. Cum erupted in a constant flow as orgasm after orgasm wracked Dinky's body.

“Holy shit.” Twist stared in awe as Dinky's cock reached twenty inches, its growth stopping long before her orgasm showed any signs of slowing down. Just the sight of so much cum was enough to bring her to her own climax, and she instinctively clamped her mouth down over the gusher of semen, swallowing as much as she was physically capable of. Cum spurted from her nose in thick gouts, and her tits let out their own gysers of fluid as the flow of milk redoubled itself. Her belly felt heavy with the sheer amount of spunk getting pumped into her, and there was absolutely no sign of it slowing down. She coughed and sputtered and eventually fell backwards, landing on her back as Dinky continued to cum and cum and cum. Twist stared in awe – the only pony she'd ever encountered who came even close to that level of production was Miss Cheerilee, who was a special case. Dinky's orgasms continued for a further ten minutes before she finally came down, collapsing backwards onto her bed, dripping with cum that had drooled down from the ceiling of her room onto her.

It took a moment for Twist to regain her composure. Slowly, she pulled herself to her feet, her belly sloshing with its load of cum. “Wow. Wish you'd told me you could do this sooner 'cos that was fuckin' hot.” She rubbed her belly, gravid with Dinky's seed. “Fuck, I look pregnant!” A crazed grin slowly spread across her face. “Look, Dinky, I've... I'll be back, but I've gotta go somewhere real quick. Trust me, you're gonna love this!” With that, she turned and ran, still topless, out of Dinky's room and, presumably, her home.

Still in a daze, all Dinky could do was mutter, “Wait. What about my notes?”

And then she passed out again.

Author's Notes:

Second chapter! This one was fun to write. Even managed to sneak some cumflation in there. Speaking of, headcanon; ponies are stretchier than humans. Better for cumflation, you see.

I am so so very sorry for transcribing Twist's lisp, even if only for a few lines.

Hot Tub

“G'morning, kiddo.”

“Urgh.” Dinky rubbed her head. “How long was I out?”

“Only twenty minutes or so. Enough for me to clean you up a bit. Your shirt's a write-off, but I did manage to mostly tidy up your room. Had to replace the sheets, but the rest was easy. And delicious.”

“Ew.”

Carrot Top grinned. “Kidding, kidding. So, you doing okay?”

“I came so hard I passed out, how do you think I'm doing?” She leaned back in the tub, her body glistening with residual moisture – along with some droplets of pre from the head of her still rock-hard cock. Almost as big as her mother's, Top mused.

“Shit, kid, it ain't all that weird! I mean, spend your whole life never having sex of any kind and then you cum that much in one sitting? Fuck, anyone would pass out there.”

Dinky stared sullenly at her member. “Yeah, sure.”

Carrot Top tossed Dinky a strip of fabric on a coat hanger. “I've set up the hot tub for you. Go on, you could use the break. And it'll help you keep your mind off of it. I even gotcha a brand new swimsuit. One of those sling bikini thingies, which you will kill in by the way. 'Specially with your dick.”

Dinky rolled her eyes. Another expensive gift, completely unprompted, as usual. “How do you even have the money for all this random impulse buying you do?” she had asked once, ages ago. “I've never seen you work a day in your life.”

Carrot Top waggled her eyebrows. “You'd be surprised how much money you can make bottling all the spare cum your mom makes when we fuck, mixing it with some of my breast milk, and then selling it at a premium as an aphrodisiac.”

“Ew!”

“That's your college fund you're ewing, Dinks. Also our house that's bigger than four rooms. And a new hot tub. And literally all of the bikinis.”

In the present, Dinky decided that it would be wise not to comment. She grunted. “Thanks, I guess.”

“Now, if you'll excuse me, I gotta go see Doctor Horse about the fact that your cock seems to have doubled in size after your little escapade with Twist.” Her usual shit-eating grin softened with worry. “That's probably bad, and your mom'd kill me if I didn't see the doctor about it.”

“Twist said this was normal...”

“Yeah, spoilers, it isn't. At least not in this case.” Carrot Top's brow furrowed deeply. “I mean, cocks growin'? That happens sometimes. But stayin' grown, 'specially for this long? That ain't normal. And anyway,” she said, turning to leave the room, “this is new information. Who knows? It could help him figure out exactly what's goin' on here and how to fix it.”

Dinky groaned, stretching her still tired body as Carrot Top left. “That'd be good. I guess.” Of course, Carrot Top was already gone at that point, so Dinky was largely talking to herself. Not that she minded. She looked down, frowning. “Celestia knows I'd like to be rid of you.” It was probably preferable that she was talking to her penis while no one else was around. “Go the fuck away, you stupid thing! At least go down!”

No response other than a slight jerking and another sputter of precum.

“Yeah, sure. You're the result of a miscast. I totally subconsciously want a giant fucking penis that's totally ruined my life, doesn’t get soft, ever and is getting bigger. Who the fuck wouldn't!?” She shoved herself upright, leaving the tub.

“And of course Twist is gonna tell fucking everybody,” she muttered sullenly. She knew that she could trust Noi to be discreet about her new appendage, but Twist? Wherever it was Twist had to go ‘real quick,’ Dinky had the uncomfortable feeling that she was decidedly not going to ‘love it’.

Dinky decided that she didn't really want to continue that line of thought. There were many places a topless, cum-inflated, breast-expanded Twist might have run off to in that kind of hurry, but she wanted to consider the implications of exactly none of them. Instead, she turned her attention to her new sling bikini. “Yeah...” It was about what Dinky expected from a swimsuit picked out for her by Carrot Top. It was midnight black, and felt amazingly smooth and silky to the touch. And, unsurprisingly, there was hardly anything to it. It widened slightly at the crotch and nipples, but only barely enough to not qualify as dental floss. The rest of it did qualify as dental floss, as far as Dinky was concerned. Still, the fabric shimmered, catching the dim bathroom lights like the scales of a tropical fish. It was, she mused, almost certainly enchanted – every swimsuit Carrot Top owned was. At minimum they all had a one-size-fits-all spell woven into the material.

And it smelt faintly of lilac. “I suppose,” she mused out loud, “it's better than nothing.” None of her other swimsuits would fit with the behemoth between her legs, and if she was going to be going into the hot tub, she figured it would be better not to do so completely naked. She shrugged and made the brief journey to the extension where the hot tub was located. The walls were almost entirely glass, allowing anyone who wanted to look in and see her. But it was also located in the rear of the house, which was already on the outskirts of town, so Dinky wasn't particularly worried about being spied on. The one wall that wasn't made of glass – the one attached to the house proper – was instead a giant mirror, put there entirely for Carrot Top to admire herself in. Dinky pointedly avoided looking at herself in it as she slipped the bikini on.

It was easy enough to slip on. Legs through holes and then pull it up and over the shoulders. There was nothing for her dong to get in the way of, so she could actually somewhat comfortably wear it. Though she'd have preferred something much more modest, this would have to do. As it was, it hardly even counted as clothing. Even her modest breasts, a trait she'd inherited from her mother, strained the fabric. It was, she mused, probably designed specifically to do that. As for the bottom, well, even if the swimsuit's skimpiness wasn't magically enhanced, there was no hope of it containing her baseball-sized testicles. They bulged from either side of the skimpy fabric, tightly outlined before plunging behind her and sinking into her ample ass.

She idly rubbed her rear a bit while completely failing to avoid looking at herself in the mirror. She couldn’t help it. She'd inherited her figure from her mother, which meant that she was very bottom-heavy. A soft, squeezable ass and wide, motherly hips that she found herself caressing with one hand as the other idly gave her balls a squeeze. They were almost comical on her feminine frame; huge and fertile and manly, and to top it all off they were attached to an equally huge and fertile and manly cock. Long and thick and dark, throbbing with a deep, aching need that she was suddenly having a very hard time resisting.

“... If having sex makes it bigger, maybe masturbating makes it go down,” she lied to herself.

She slowly slipped into the tub, sighing as the heat of the water soothed her sore body and sent electric tingles of arousal down her spine. “Mmmmmmmyeah that feels good,” she muttered, hands exploring her body. It felt good to just let go, to put aside all her reluctance and just enjoy herself. Her penis was so sensitive that just entering the tub had cause it to spew thick gouts of pre with redoubled intensity, but actually touching it was heavenly. She firmly grasped the dark shaft with one hand, woefully inadequate for masturbation, but she had magic to make up the difference. Her horn lit, and the base of her cock was enveloped in her golden glow, slowly stroking and squeezing while her other hand was free to wander behind her ballsack and give her lady parts some much needed attention. She groaned, gently rubbing her damp slit. She hadn't noticed until now, but her cunt was as aching with just as much need, and she was finally giving it the attention it needed. Firsthand, not from an outside source. And it felt good.

Really, really good.

Her horn sparked, a shower of gold flying everywhere as she felt herself approaching the edge. “Fuck!” Her ministrations became stiff and jerky as her hips quivered, weakly thrusting into her masturbation. She was so close already, just a little bit more and-

Somepony roughly grabbed her arms from behind, yanking them away from her body and pulling her out of the tub and onto the heated tile surrounding it.

“I don't think so, slut.” A pink-furred foot pressed down onto her member, firmly and roughly. “If you think I'm going to let you waste all that cum just masturbating, you've got another thing coming. Hold her, Silver.”

Diamond Tiara licked her lips, a predatory grin playing across her face. “I wanna see if I can take the whole thing.”

Dinky opened her mouth to object, but all that came out was a low moan as Tiara ground her foot against her cock. “Don't even bother. I know what you're gonna say, and it's all bullshit and you know it. Here you are, jerking your two foot horsecock off while wearing fucking dental floss in a big fucking glass room where anypony could see you. Your door wasn't even fucking locked! I don't care what flimsy justification you use, you clearly wanted this.” She pressed down sharply, drawing a gasp and another geyser of pre from Dinky. “And anyway, you didn't really object to the titfuck and blowjob Twist gave you. 'least that's how she tells it.”

“Hi, Dinky~ Told you that you'd love thith!”

Dinky let out an exasperated groan that very quickly turned into a lustful moan as Tiara ground her foot one last time before removing it. “Look, if you're still uncomfortable after I'm done, I'll pay you whatever damages you'd get from a lawsuit anyway.” She deftly removed her clothing in a series of practised, fluid movements. “I mean, you won't be, but the offer's on the table. Either way,” she grabbed Dinky's meat firmly, carefully positioning it beneath her waiting fuckhole, “if you think I'm passing up the opportunity to fuck a cock that grows a good five inches every single time it cums, you've got another thing coming, slut.”

“Sorry about this,” Silver Spoon said, her voice low enough that only Dinky could hear her. “She gets like this sometimes. I tried to stop her, but she has trouble grasping that rape is bad? If it helps, she's not lying about paying you off.”

“Thanks,” Dinky grunted. “That really puts my fucking mind at eaaaaaaaaaaaaafuck,” her train of thought was interrupted by Tiara suddenly plunging down, going straight to the hilt in one go with far more ease than should have been physically possible.

“Ngggg yeah, that's fuckin' good,” Tiara grunted, cupping her ample breasts – not as large as Twist's, but easily rivalling Noi's, mostly due to natural magical enhancements. She tweaked her pierced nipples, tugging on the silvery barbells. “You like 'em? They're magic. Let me take anything without ever losing my perfect tightness.”

Tiara wasn't lying. Her cunt was like a goddamn vice, squeezing and milking her cock, putting pressure on all of the most sensitive spots with the practised ease of an experienced slut. “Not that I needed them. You're not even as big as Silver -”

“Yet,” Silver purred, gently licking Dinky's cheek.

“I mean, look at this bulge. Practically nothing.” Dinky stared in awe at the perfect outline of her cock, pushing and distorting Tiara's otherwise perfect abs, all the way up to between her ribcage. Dinky swallowed heavily as she processed the implication of this being “nothing” for her. “Anyway, you'd better hurry up and cum, slut. At this rate we'll be here for a week before I'm even slightly satisfied. Silver! Twist!” she shouted, grabbing Dinky's arms and pulling her upright before cooperating with Silver to pull her into a tight embrace, their breasts pressing firmly together. She felt the cold metal of Tiara's piercings digging into her smaller breasts. She could also feel Sliver's cock, pressing firmly into her back as the larger mare held her arms behind Tiara. More cold metal pressed into her spine, a series of icy points sending sparks of arousal through her body and sparks of gold sputtering from her horn.

“It's called a frenum ladder. And yeah, 's also enchanted. Same one as Tiara's just in reverse. Hope you like the idea of twenty four inches of cock up your ass because that's what you're getting.” She casually lifted Dinky and Tiara as she stood, and then lifted them higher (with some assistance from Twist.)

“W-what, no! Wait!” Dinky shouted, her voice tinged with arousal and panic as Silver moved one hand to steady her cock while Twist manoeuvred her grip to pull her legs up above her head, spreading her asscheeks wide.

“Too late, slut,” Tiara purred into her ear. “Just relax or it'll hurt. Silver, go.”

Dinky screamed as she plunged, her heart sinking into the pit of her stomach like she was on a roller coaster. And then all sensation was gone, her mind consumed by the tightness of Tiara's pussy, the impossible fullness of Silver's two foot behemoth in her ass, the pressure of Tiara's nipple piercings against her breasts, of her own bulge pushing its way through Tiara's body to dig into the bulge Silver had produced in her. “Fffffffuckkkkkkkkk cummmingggggg!” Her horn erupted with a shower of golden light in conjunction with her cock erupting with copious amounts of semen. She struggled and squirmed, but despite her slight frame, Silver's grip was like iron, leaving Dinky unable to thrust or even actively participate. All she could do was groan as Tiara pulled herself up and down her cock while Silver lifted and then dropped her, leaving Twist to eagerly grope at her plush ass and leaking cunt, the three of them milking orgasm after orgasm after mind-blowing orgasm from her.

Slowly her body was pushed away from Tiara's, between her expanding bulge and Tiara's own swelling gut as more and more semen surged inside of her. “Ghaaaaa!” Her horn erupted again, the golden sparks shooting high into the air before gently floating downwards, settling on the gangbang below.

“Gnnn cumminggg!” Silver groaned.

“Woah hey what-”

Silver's strength gave out as her orgasm hit, and Twist wasn't nearly strong enough to support the weight of three other ponies, causing them to topple over into the hot tub. The bubbling in the water intensified as it slowly turned an opaque cream, then died down as, one by one, four mares spewed forth, panting and coughing and struggling to get their breath back.

“Ow.”

“Fuck.”

“Thith wath a thtupid idea in retrothpect.”

“That was awesome! Let's do it again!”

“What.”

“No.”

Tiara grinned like a madmare. “Well, I mean, so next time we do it somewhere a little more stable and not next to a pool. Everything else was fucking amazing!” She rubbed her gravid belly. “Fuckin' look at me! This is easily in the top five biggest cumshots I've taken!”

Dinky stared in disbelief. “Bullshit.”

“I feel like I can still mostly move about on my own,” Tiara said, caressing the gurgling bulge of her belly, easily big enough to fit several infants inside. “But still. Damn.” She grinned. “Feeling your cock grow bigger inside me totally makes up for the lack 'a volume.”

“I'm not sure whether I should feel insulted by that or not,” Dinky grumbled, blushing and looking down at her decidedly past two feet horsecock, still erect as ever.

“Well,” Silver interjected while Twist eagerly got to fondling Tiara's cum-inflated belly, “did you at least enjoy yourself?”

“No,” Dinky lied.

“So you don't wanna go again, then?” Silver grinned, grasping her own jet black and still very erect cock.

“... no.” Dinky blushed. “I mean yes. I mean... fuck, you know what I mean.”

There was a gurgling noise.

“I won't tell anypony, don't worry.”

“Hey, uh, guyth?”

The gurgling intensified.

“Tell you what, help me clean all the cum out of the hot tub and we're even.”

“Guyth?”

“Yeah, okay, deal. I feel like I owe you considering it's partially my mess.”

“Guyth!” Silver and Dinky snapped out of their conversation with varying levels of irritation.

“Shut up, Twist! Did I give you permission to speak?” Silver spat. “Your stupid fucking lisp pisses me... off...” her tirade trailed off as she noticed Diamond Tiara.

And the source of the loud, wet squelching noises. Tiara squirmed and writhed, lying prone on the ground as, slowly but noticeably, her belly began to shrink, accompanied by a soundtrack of upset stomach noises.

“Ghhhnnnnnng fuuuuUUUCK! Haaaaaaaahhhhhh~” Tiara's hands furiously pawed at her convulsing cunt, her hips bucking wildly as fluids spewed and stomachs groaned and shrank, until it all culminated in a loud, wet, cum-scented belch as Tiara's gut finally returned to its normal size and shape. She collapsed into a quivering puddle, panting heavily. There was a minute of stunned silence that Tiara eventually broke; “What the fuck was thaaaaaaaaAAAAAA!” There was a flash of golden light as Tiara thrust her hips in the air, gout after gout of thick cum spewing from her new ten inch, deep lavender member.

Experiments

"What the fuck was that?"

Tiara lay prone on her back, chest rising and falling heavily. "I have no idea," she breathed in between pants, wiping a strand of cum – her cum – from her face. "But it felt awesome." She grinned, and shifted herself so that she was sitting, leaning against the mirrored wall for support.

"You grew a dick. That isn't fucking normal."

"You're one to talk," Tiara retorted, lazily gesturing her head at Dinky's own prodigious member.

Dinky blushed, averting her gaze. "We should probably call a doctor. Or something. Fuck, I dunno, this isn't-"

"Normal, you said." Silver gave Dinky's hair a light tousle. "You need to chill. Seriously."

"And anyway, it's not like we need a doctor to tell us what happened. You, little missy, are contagious." Tiara smirked, before turning her attention to her new meat. She looked it over appraisingly, giving it a little squeeze. "Not much to write home about. Yet." She licked her lips.

"W-well," Dinky stuttered, blushing slightly, "maybe it doesn't grow with sex. Maybe that's just me?" She was still pointedly avoiding looking at any of the other two penises in the room, though her eyes betrayed her, darting to gaze at Tiara's lavender shaft.

"Well," Tiara pushed herself to her feet. "There's one way to find out for certain. Twist." She pointed, and Twist grinned eagerly. "You're the only pony here without a cock of her own. Wanna try and see if we can fix that?"

"Oh, fuck yeth!" Twist eagerly manoeuvred herself onto all fours, wiggling her ample ass in the air. "Fuck me hard! Pump me full of your baby batter!"

"Ech, no talking." Tiara wrinkled her nose. "That was probably the most unsexy thing I've ever heard. Just... your mouth is put to better use giving Dinky a blowjob or something."

"No, thanks," Dinky grunted, scooting away. "I think I've had enough sex for one day."

"What, you don't wanna test out how this shit works? I mean, if this happened to me – and oh, look, it did – I know I'd sure as shit wanna spend some time figuring out the rules. If I fuck Twist in her cunt, will she grow a dick? What if I fuck her ass? What about Silver, will it make her cock start growing? Will she grow another cock? Does masturbation make it grow, too? Or does someone else have to be directly involved in the orgasm?" She firmly grasped Twist's ass with one hand, the other steadying her drooling shaft. "And, most importantly-" she thrust her cock into Twist's asshole, grunting from the tightness of her partner's hole. "How fuckin' big can we get? Oh, shit, your ass is fucking tight, slut.”

“I'm already too big,” Dinky muttered, trying not to stare as Tiara began to thrust in and out of Twist. “I don't wanna grow bigger, let alone push the fucking limits.” “You fucking lunatic,” she didn't add on to the end of her sentence, but the unspoken sentiment was there.

“There's – nggggg – there's no such thing as too biiiiig. Only t- fuck – too smallfuckyes!” She thrust hard into Twist, before resuming a more consistent rhythm to her relentless fucking. “And right now I'm waaaaay too fucking smaaaaaaaaAAAAAAA!” Tiara's regular rhythm became erratic – and much faster, plunging her length into Twist with relentless abandon. Each time she pulled out, cum spurted out with her, leaving her crotch increasingly coated in streaks of sticky white. And each thrust inward churned the cum into a bubbly froth. “Ooooh FUCK, I can feel it happening! Bigger! Bigger! Fucking BIGGER!”

Dinky's hands wandered southwards.

“Ngggg,” Tiara groaned as Twist slumped forward, tongue lolling out of her mouth giddily. Slowly, she pulled herself from within Twist, inch after inch. Almost certainly more inches than had initially gone in. “Fuck, that felt good. Got a dick, yet, Twist?”

“Noooooooo,” she groaned, writhing around on the ground. “But it tinglethhhhhhh.”

“Well, then,” Tiara grunted as she pushed herself to her feet. “Give it a bit to grow in, and if it doesn't I'll fuck your cunt once I'm done blowing Silver.”

Silver interlocked her fingers and stretched her arms above her head. “About damn time.” Her cock twitched, drooling pre in anticipation. “Might I enquire why I'm the one getting a blowjob?”

“Well,” Tiara lowered herself to her knees, and leaned in to give Silver's obsidian monolith a gentle caress, drawing a cooing noise from the taller mare. “I don't wanna fuck you properly just yet because then you might end up growing, and we can't have that until I've got a solid lead on you. Don't wanna risk not being the biggest, after all~” She gently kissed the head, licking up some of Silver's copious pre.

“Mng, that's fair. So then why am I not the one blowing you, oh mistress of mine?”

“Har. No need to be sarcastic.” Tiara gave Silver's member a rough squeeze, drawing a satisfying grunt. “I already know getting blown makes it grow. I wanna see if it'll grow if I'm the one doing the blowing.”

“Well, Dinky's only grows when she cums, and right now you're not getting any stimulation, sooo-”

“Woah hey what!” Silver lifted Tiara, elegantly suplexing her up and forward until she was sitting on her face. “What the fuck?!”

“Like I said, you aren't gonna cum if you don't get any stimulation. We already know you can get bigger if I suck you off, and that'd probably apply to a handie, too. But,” she reached upwards and adjusted Tiara's balls, pushing them forward and aside in order to get a better shot at her real prize. “There's other ways to show a lady a good time. Like, oh, for instance...” Her head darted forward, giving Tiara's clit a gentle nibble.

“G-haaaaaa fuckin'-” Tiara's ass came down on Silver's face, hard, enveloping her in soft, warm flesh. “Ahaaaaan god damn Silver I can't suck your coooOOOock while you're doing thaaaaAAAAA-” She squirmed, Silver's arms darting upwards to firmly hold her in place before she could thrust her way out of cunnilingus. Silver's talented tongue hit all of her most sensitive spots, leaving her writhing with pleasure on the edge of orgasm. “Silver this isn't funnyyyyyy!” Tiara convulsed as Silver relentlessly ate her out, her back arching and her hips quivering as they impotently attempted to out-thrust the much larger mare's iron grip – and even then, her legs had just enough wiggle room to kick out wildly and erratically. Her arms splayed out on the floor, rigid and quivering and just barely keeping her body upright. “Gonna cuuuummmmm~ Gonna get bigerrrrrrrrr~ Gonna get huuuuuuge~ Gonna- gonna- gonna- goooohfuck!” Tiara's upper body strength gave out, and her body slowly slid down until her head gently reached the ground, arms splayed to her sides and face down, body mostly parallel with Silver.

And then, just like that, it all stopped. Tiara slumped forward limply as Silver released her grip. “Oh, come the fuck on! You know I fucking hate being edged, Silver!” She groaned, writhing against the ground. “That's my job!”

“Oh, don't worry, it's gonna be worth it, I promise.” Silver grasped Tiara's hips, hefting her ample ass in the air. Her thumbs deftly parted Tiara's cheeks, revealing drooling lower lips just begging to get fucked senseless. “I figured you'd get pissed at me if I stuck to oral. 'n anyway, I've only came once so far and you're already pushing three.” She entered Tiara with the ease of a seasoned expert.

Tiara cooed. “Mngggggg yeah, fuuuuck, I approve of this decision~” She made a feeble attempt to push her upper body off of the ground, failing miserably. All of her strength had been sapped by Silver's earlier attentions, her arms just managing to twitch halfheartedly in time with Silver's slow, methodical thrusts. “Ahnnnnn, Silver, you bitch, fuck me harder!”

“Nnnnnope.” Silver grinned, giving Tiara's ass a nice, firm slap. “Way I see it, you're almost certainly gonna let Little Tiara go to your head. This might very well be the last time I get to make you my bitch for a good long while and I intend to enjoy myself~”

“Gnnnnn, fuck you.”

“That comes later, babe. Fuck, you're tight.” Silver didn't have to take it slowly. She could, and very often did, jump right to burying herself to the hilt. Tiara could certainly take it and more. But no, today she felt like being a tease. She pushed herself deeper and deeper, a fraction of an inch more burying itself in Tiara's inviting depths with every thrust. It was agonizing, the pace carefully calculated to keep Tiara just on the edge of orgasm for as long as fucking possible. Silver wanted to enjoy this.

“Fuuuuuucking hell, Silver, you know I fucking haaate it when you drag this shit oooooout,” Tiara moaned as best as she was capable of. She weakly pressed her hips back against Silver's thrusting, only for Silver to calmly shove her back down.

“Nope. We're going at my pace, lil' miss incapable-of-not-topping.”

“Fuck you, Silver,” Tiara grunted. She weakly pushed herself up, using what little strength she could muster to at least remove her face from the floor. “When this is done I'm gonna kick your a-mph!”

Tiara's train of thought was derailed, and her threat to Silver interrupted, by something big and hard and decidedly cock-like shoving itself down her throat. All twenty five inches, down to the hilt.

“I thought you weren't enjoying yourself.”

“Mmmf. Consider it payback,” Dinky muttered. “She rapes me, I rape her back.”

“I don't think this really counts as rape. She looks like she's enjoying herself at least.”

“Yeah, well, I'm not really in the mood to wait.” Dinky's body quivered, pushing itself firmly against Tiara's face in a vain attempt to bury just a little bit more penis in her tight throat. “Mnnn, I guess your magic piercings work on all your holes. Or maybe you're just really good at suppressing your gag reflex, I don't know.”

“Wanna see how long she can hold her breath? 'cause she can hold her breath for a while.”

“Nah, think I'll just go until I cum and then Twist can take over. I'm trying to avoid getting too much bigger, after all.” Dinky began to thrust, much more wildly than Silver. She pulled herself almost all the way out before plunging right back in to the hilt, again and again and again, faster and faster. Tiara made delightful gurgling noises with each thrust, and the sensation of her fat balls smacking against Tiara's face was surprisingly good.

And getting fatter. She could feel them getting heavier already as each thrust brought her closer to release. “Hey, Tiara, mngg, better hurry up 'n cum before I get an even bigger lead on you~” she said as teasingly as she was capable of.

“Well,” Silver said. “If we're not gonna bother pacing ourselves, I guess I might as well go all out!” She thrust the rest of the way in, before vastly picking up the pace. She fucked Tiara's needy cunt even harder than Dinky was fucking her face. “Hey, Dinky, I think I can feel your cock bumpin' against mine through her womb.”

“Mmmfuck, we do have more'n four feet of cock between us.” Really, they shouldn't have been able to fit all of their cocks into her at all, let alone felt each other through Tiara's organs. But, well, magic. Dinky didn't pretend to understand the logistics behind whatever enchantments Tiara and Silver had on their piercings, and she wasn't exactly in a state of mind to question them. She was just barely managing to cling on to her train of thought through the sensation of giving in to her body's urges.

Which, she realized with a sinking feeling, she probably shouldn't have done. She'd let herself get caught up in the moment and now she had probably passed the point of no return. She could, she supposed, pull out and go back to her original plan of relaxing in the hot tub. Except that the hot tub was thoroughly contaminated with their earlier escapades and it would be very difficult for her to ignore Tiara and Silver and Twist at this point. And besides that, she knew just enough about male anatomy to know that stopping now, while she was so close, would likely just make the inevitable next orgasm worse.

No, at this point, cumming – and the growth that would result – was an unfortunate obligation. She was going to slip up at some point anyway, and it was better to do so now and at least contribute a little bit to Tiara's attempts to better understand their condition that were pretty clearly just an excuse for a small orgy. Dinky wasn't entirely sure if it counted as an orgy with just four ponies, but whatever, she'd already spent too much time thinking about this and all it was really doing was mildly delaying the inevitable catastrophic failure of her willpower. She would have plenty of time to spend thinking about whatever she damn well wanted to in the future. Right now, it would serve her best to get it over with as quickly as possible. Focus on the sensation. The tightness of Tiara's throat, the heavy sway of her overfull ballsack, the heat, the moistness. The primal urge driving her to pump this little slut's face full of hot seed.

Hot seed that she felt really should have come by now. Until now, her new addition had been on a hair trigger, cumming at the first excuse it got. It wasn't that it hadn't been long enough since her last load for it to replenish; she could feel tangible evidence that her ammo had more than replenished enough to blow Tiara up like a balloon. Perhaps it was a matter of her mind constantly wandering away from the sex, but something told her that was a symptom rather than the real cause. Maybe it was waiting for Tiara to cum first, out of some kind of twisted sense of etiquette. Or, she briefly dared to hope, it might just very well be that it had finally reached its limits.

“Oh shit.” Or perhaps it just had a very mean sense of humour. “Oh shit, oh shit, oh shiiiiit~” Her horn sputtered, a thin stream of golden sparks erupting from the tip. The sensation was distressingly familiar. A building pressure at the base of her shaft, slowly but surely compounding upon itself with every thrust. Her body moved on its own, her earlier eager rhythm becoming jerky uneven lurches before fully burying herself balls-deep in Tiara's tight throat. “Oh shit cuminggggggg!”

Her orgasm was slow. She had never thought that orgasms could be slow, not like this. Almost as if her cock knew she was trying to get this over with and was dragging things out, out of whatever spite that a cock was capable of experiencing. She could feel Tiara's throat getting tighter and tighter as the base of her shaft swelled. Bigger and thicker and bigger and thicker as a titanic load pushed its way upward with agonizing slowness. It doubled in girth, and didn't come back down even as the bulge travelled its way upwards towards Tiara's waiting gut. Probably because there was even more cum waiting behind that first shot. It felt like her cock was a firehose that someone had tied a knot in, and even as the water slowly forced its way past the blockage, more and more of a backlog built up behind it.

Silver had came, at some point after her orgasm had started, but Tiara was already showing a noticeable bulge as her cunt was pumped full of thick batter. Tiara came in conjunction with Silver, her cock pumping out far more spunk than would have been expected – had Dinky not experienced the same thing herself, she would have been impressed. With every pulse of semen, it inched bigger and bigger and bigger. Even still, it paled in comparison to Dinky's. It hadn't been that long ago when she'd considered her own fifteen inch meat to be huge, and now Tiara's was past that and she still managed to fucking dwarf it. And she hadn't even grown yet.

Though that fact was short lived. Even as a spent Silver slid out of Tiara, collapsing backwards onto her ass, Dinky's own load finally reached its destination and erupted. An unfathomable volume of cum, fed directly into Tiara's stomach. The bulge of Silver's own load was almost immediately overwhelmed as Tiara's stomach exploded outwards like a balloon. She came, again, Dinky dimly registered. She couldn't tell if Tiara also grew again, what with the large orb of taut flesh in the way, but it was a safe assumption she supposed, which would put Tiara at a respectable twenty five inches. Starting out at ten, five inches per orgasm. They hadn't needed to experiment to find that out, at least – Dinky had figured that much out after her escapades with Twist.

Time seemed to blur together. It felt like days had passed when her orgasm finally died down. As she slid her way out of Tiara's throat and collapsed into an exhausted puddle of flesh on the heated floor, her now thirty inch cock flopped heavily onto her chest. It was, of course, still hard. Why wouldn't it be? “Ooogh.”

“You and me both. Fuck, where were you keeping all of this?!” Tiara rested comfortably on her beanbag chair of a belly, her body sinking in to distended flesh. “Silver, quick, how big am I.”

“Thirty inches, looks like,” a dazed Silver responded. “You prolly came more'n once from that.”

“Ha! Tied for first place, then. And if someone keeps on being a slowpoke with one orgasm to my three, that tie's gonna become a solid lead.”

“I thought we were testing out how this works?”

“Oh, yeah, we are. We're just also making sure that I'm the biggest.” Tiara gave her fat gut a smack, the sound of flesh impacting flesh echoing throughout the pool room. “Speaking of which, though, I'd say we've made good progress on the science front. We know that I'm about as contagious as you, we know that any orgasm with somepony else involved makes us grow, and we know that anal and vaginal are contagious but oral isn't. Next experiment; what happens if I fuck your cunt.”

“Ugh,” Dinky groaned. “I've got a better idea. Let's not and say we did.”

“Oh, come on, you seemed pretty happy to fuck my face just now.”

“Yeah, well, getting fucked is a different matter altogether. Besides, I was already way too big before I got involved in the last round and grew again. Come back when you've come up with a way to make this sucker smaller, then we'll talk.”

“I already said, there's no such thing as too big.” Tiara grinned down at Dinky's prone body. “Only too- hic!” Tiara's belly let out a loud, wet gurgling noise. “Ooooohhhh, this is – hic! – this is newwww~”

“Oh, Celestia, what now,” Dinky muttered to herself even as the wet gurgling intensified. Tiara writhed on top of her gut, moaning in between her hiccups.

Her gut that was getting disconcertingly smaller with every hiccup. “What the fuck?” Silver muttered, more to herself than anything.

“I don't know and I don't fuckin' wanna know,” Dinky replied grumpily. “I am super fucking tired of my penis doing weird shit.”

“There'th a thentence I bet you thought you'd never thay.”

Dinky crawled her way over to the mirrored wall and flopped against it in a rough approximation of sitting. “I'm gonna pass out now. Wake me when this is all done and please try to avoid molesting me in my sleep, okay?”

“I make no promitheth,” Twist replied, earning a sharp, disapproving hiss from Silver that just barely managed to be audible over whatever was happening to Tiara.

“We'll leave you alone, I promise.” That was all Dinky needed to hear. Already she could feel herself slipping into unconsciousness. Darkness danced at the edge of her vision, slowly encroaching its way into the waking world. “I mean, why bother with you when we've got Tiara right here?” was the last thing she heard before slumber claimed her.

---

“Irresponsible! Dangerously irresponsible!”

Dinky hadn't expected to wake up to shouting. She opened an eye, just a crack.

“Mornin', squirt.”

“Mph. G'morning, Top.”

“I see you had some friends over.”

“You could say that,” Dinky muttered. “I take it mom's not happy?”

“You could say that. Man, I shoulda made popcorn.”

“Thorry, ma'am,” Twist said, apologetically. She shuffled awkwardly, shifting her weight from one leg to the other rhythmically and covering her naked body as best as she could with just her hands. A futile effort, considering how big her breasts alone were. Her cock jutted forward proudly, twenty inches long and drooling and-

“Wait, hold on, is... is Twist's cock fucking candy striped?”

“Looks like it, yep.” It was like a novelty penis-shaped candy cane jutting out of her crotch, white and red entwining along its glistening, twitching length.

“Why am I not surprised?”

“Sorry?! Do you girls have any idea how dangerous this was?”

“I'd just like to say that I was mostly uninvolved, ma'am,” Silver said. She had done a much better job of maintaining her composure than Twist – it probably helped that Derpy was almost a full head shorter. She had also, Dinky noted, grown a second penis. Both members were erect, and both were bigger than she remembered Silver's original cock being. “Like, I am completely throwing Twist and Tiara under the bus here. I didn't lay a single finger on your daughter.”

“Oh, don't fucking lie, you were the first pony here to put your penis in her here.”

“That doesn't count, it was under duress!”

“If I'm getting in trouble for this then by Celestia's ass so are you.”

“You are such a fucking bitch.”

“I don't care who did what!” Derpy shouted, arms flailing wildly. “Look at my daughter! Look at yourselves!”

Tiara grunted sullenly. “'s just sex,” she muttered. She had changed the most of the three. She was taller, if only by a few inches, and her breasts and hips and ass were all significantly bigger. The real star of the show, though, was her penis. It had to be bigger than she was tall by a good foot, and it wasn't even fucking hard. “She's only thirty inches, that's perfectly manageable.”

“She isn't supposed to be any inches!”

“Mom.”

“Didn't you even consider for a second that maybe you shouldn't play around with this until we understand exactly what's going on? You could have gotten hurt or even killed!”

“Mom.”

“Oh!” Derpy immediately stopped her tirade to rush over to Dinky's side. “Are you all right, sweetie?”

“I'm fine, mom. Just... It's fine, okay? No one got hurt and they didn't really do anything wrong other than a little bit of rape at the beginning.”

“A little bit of rape counts as doing something wrong! Very wrong!”

“Please don't shout.”

“Sorry.”

Dinky sighed. “It's fine, mom. I'm not mad and I'm not hurt and they're not hurt so we can just drop the subject for now, okay?”

Derpy's ears flattened against her head. “Well, okay, but I'm still calling their parents.”

“That's fair,” Silver said, shrugging.

“We did kinda rape you a bit,” Tiara added. “Though I mean you did rape me back a bit.”

“Oh that totally didn't count as rape and you know it.”

“Oh, don't you start, miss happily throwing her marefriends under the goddamn bus to get outta getting in trouble. She even said she was raping me!”

“Guys you should prolly stop talking.” Both mares promptly shut the fuck up. “Right.” Dinky laboriously pushed herself upright. “Now, if you'll excuse me, mom's definitely gonna be dragging me to see Dr. Horse again, I could really use a real nap that isn't just me passing out from too much fucking, and I've prolly got a bunch of homework to do.” She shrugged. “Or at least I assume, I've been kinda occupied since Twist brought my notes over, and she didn't leave 'em when she went to get Tiara and Silver, but I figure I've got homework to do, so I'm gonna go do that.”

“Um.”

Dinky stared blankly at Twist. She knew what was going to come next, but still felt the need to ask. “Um?”

“Would you believe that I, uh, kinda forgot your noteth along the way to get Tiara?”

Dinky continued to stare blankly. “Right. Nap it is.”

Payback

Dinky had been sleeping an awful lot lately. It probably wasn’t very healthy, to be honest. There were extenuating circumstances, to be sure, but that didn’t change how utterly fucked her circadian rhythm was going to be once this was all over and done with. It also probably didn’t help that a lot of it was less “sleeping” and more “briefly losing consciousness due to extreme sexual exertion.” Passing out three times in as many days couldn’t possibly be good for a pony’s long-term health. At least this time she’d managed to actually go to fucking sleep on her own terms in her own goddamn bed for fucking once. Even if the sheets were still in the process of being washed after her encounter with Twist, she at least got to sleep on her mattress in her room.

That was another blessing. Diamond Tiara, as far as Dinky could tell, had been more than happy enough to leave her alone after realizing she could engage in a growth feedback loop with her weird harem thing. Thank Celestia she’d managed to get out at only thirty inches – she shuddered as she remembered what had become of Tiara. Obviously she didn’t have exact measurements, but that it was bigger than Tiara was tall while soft was somewhat telling of just how much fucking Tiara had done while she slept. And at least she only had the one cock, instead of Silver’s two. She couldn’t really deny that it was kinda hot, on somepony else, but she couldn’t imagine how they’d be able to function on a day-to-day basis with cocks that huge – that, from what she knew of Tiara, were only gonna get bigger.

Small blessings. Focusing on them certainly helped her to ignore the fact that her irregular sleep patterns had left her feeling groggy and miserable. Like somepony had been sitting on her face all night.

It took her a moment to fight through the just-woke-up haze and realize that actually no, somepony was literally sitting on her face. “Oh my god,” she groaned, her words muffled by the face full of ass she was getting. Whoever it was, they weren’t exactly light. “Please get off,” she followed with some effort, her words swallowed almost completely by fat orange butt. She had to resort to giving it a good, solid smack. Initially it seemed to have backfired, drawing a moan of pleasure from whoever it was, but thankfully they followed that up by gently removing themselves.

“Uh, sorry about that. Ti- uh, Mistress Tiara said I had to do that.”

“Oh my god.”

“She also said you’d probably react that way and I don’t, uh, really blame you?”

“Snails please go home.”

Snails shrugged. “Believe me, I would love to, but Tiara would know. She always knows.”

“Oh my god.” Dinky had already said that exact thing not a minute ago, but it remained relevant to the situation. “Okay, hold on, I just woke up, I haven’t eaten or had any coffee yet. I’ve got no idea what the fuck is going on or why you’re here and I’m too tired to even care.”

“Sorry,” Snails muttered, fidgeting nervously and pointedly avoiding eye-contact. “Uh, Tia- uh, Mistress Tiara didn’t say we had to get started right away. I can go make coffee if you’d like?”

“Not dressed like that you’re not.” Though dressed was generous terminology. The only clothing he had on was women’s underwear – a translucent pink camisole and frilly pink panties that dug deeply into his soft, feminine hips. He even had some light makeup on. Bright red lipstick that accentuated the fullness of his lips, mascara to make his eyelashes fuller and longer, and a pale lavender eyeshadow. If it weren’t for the sizable bulge in his panties, he’d almost be able to pass for a girl. The sizable bulge that, Dinky noted with mild annoyance, was put to shame by her own member. “I, uh, wasn’t aware you were into that.”

Snails blushed. “It, um, it makes me feel pretty,” he mumbled awkwardly. “I’ve got real clothes, I can put ‘em on long enough to go make you coffee.”

Dinky couldn’t help but bite her lip. She was still staunchly refusing to let her new addition and the accompanying heightened libido get the better of her. But damned if Snails wasn’t cute right now. It was a surreal thought to have – normally Snips and Snails were pretty much the antithesis of cute. But he pulled off the look well. Very well. Her cock throbbed slightly, and she shook her head slightly. “No, uh, that’s fine. Let’s just get whatever this is over with so you can go home.”

“Oh, okay!” Snails’s expression immediately brightened in an unbearably cute way. “Mistress Tiara says that she owes you an apology for, um, raping you? She wouldn’t tell me the details, what’s up with that?”

“Ugh. It’s, uh, a long story.”

“I figured. Did you see her? Her pants looked like she’d stuffed Scootaloo in them.”

“I’ve seen her without them on.”

Snails’s eyes widened slightly. “Okay, I think I’m beginning to see why you were uncomfortable with sharing details.” As though the fact that Tiara claimed to have raped her wasn’t enough. Still, she couldn’t bring herself to be too mad at Snails. His innocent expression of dawning realization was just as adorable as every other facial expression he’d made so far. “Uh, anyway, she said she wanted to make it up to you.”

“So she sent a member of her weird harem thing?”

“Oh, no.” Snails raised his hands defensively. “I think that’s just her, Silver, and Twist.” He placed his hands together, gently tapping his index fingers together nervously. “She just, um, knows things. Things I’d rather be kept private, if you know what I mean.”

“Fair enough.” Dinky shrugged.

“Anyway, I’m not supposed to leave until you’ve, um. Made use of me. Sorry.”

“It’s not your fault, Snails,” Dinky replied with a sigh. “Look, uh, it’s not you that I have issue with, it’s just, uh. I kinda don’t wanna get any bigger than I am.” She gestured at her cock. “I mean, I’m almost three feet at this point, I’d rather still be able to get around like a normal pony.”

“Okay,” Snails replied with an understanding nod. “I can understand that, it looks cumbersome. Does it even ever go down?”

“Not so far.”

Snails visibly winced slightly. He was the first to show genuine empathy with how inconvenient this was for her. Dinky felt slightly better about the situation because of it. “And, uh, sex makes it bigger?”

“If I cum, it grows. Also if I cum inside of a girl’s pussy or ass then they grow one. Or at least Tiara cumming in Twist’s ass made her grow one, I dunno if it works for me and honestly I’m not all that invested in finding out.”

“Well, okay. We can probably get away with just, um. Just getting me off, then. I can do that real quick in the corner and get out of your hair.” He blushed again, fidgeting slightly. “Uh, sorry for sitting on your face, by the way. Tiara kinda implied you wouldn’t object.”

“Oh, it’s fine,” Dinky almost said, but immediately thought better of it. That was her libido speaking, not her. She did object, really. Not to the face-sitting in abstract, but to being surprised by it. That wasn’t really Snails’s fault, though, and she didn’t want him thinking otherwise. But dammit she was trying to avoid letting her libido get away with her. Even if Snails was being unbearably cute, she couldn’t let herself get carried away again.

Still, didn’t mean she couldn’t enjoy the view. Snails had a really nice butt, which wiggled deliciously as he turned and walked into a corner. It bounced slightly with every step he took, the undersized panties barely able to contain a fraction of its mass. She just wanted to give it a good squeeze, or maybe even more.

“Hold on.” Dinky was barely aware she was speaking before the words came out of her mouth. “Why don’t you sit on the bed instead, it’s prolly more comfortable.” Dimly, she was aware that her libido was talking for her, but she didn’t really find herself objecting any more. Certainly, her rational mind interjected, it’d be very rude to force Snails to sit on the floor and masturbate.

“Oh. Yeah, okay. Thanks!” Snails turned around, giving Dinky another look at his package even as she got up from her bed.

“I can sit in my office chair, you can sit on the bed, rub one out real quick, maybe like rub some of my pre on your face or something to make Tiara think we fucked?”

“Sounds like a plan! Maybe you can, um, put on some clothing in the meantime?”

Dinky hadn’t even noticed she wasn’t wearing anything. She didn’t particularly mind, either, which would have been odd in any other situation, but in a broader context she honestly had bigger worries. “Eh, it’ll be fine. I doubt anything’ll fit and it’s not like you’ve not already seen everything I’ve got to offer.” That was also her libido speaking, but it was too late for her to turn back now. Her cock had taken the wheel – she was just along for the ride. So long as it was just content to ogle Snails, she was okay.

“Oh. Um, that’s fine too.” Snails shrugged. “I mean, I was kinda prepared for you to ravage my butt when I came here. I’m okay with whatever you’re comfortable with.”

“I’m comfortable with that ravage your butt thing,” Dinky managed to force herself not to say. “I’m okay with ogling you for now~” was what she did end up saying. It was more flirty than she was really comfortable with, but at this point she’d take not offering to fuck his ass over anything else.

“Well, then I’m okay with being ogled~” Snails replied. “Heck, if anything, I wouldn’t object to you getting more hands on. You’re, uh,” Snails paused to blush furiously. “You’re really attractive. If you don’t mind me saying so.”

Dinky took a deep breath. She wouldn’t mind getting more hands on, either, but things were hands on enough as it was. “Thanks,” she muttered. She hadn’t ever really considered that other ponies might find her attractive. And yet, in the past three days she’d received concrete evidence that it was very much the case from numerous sources. Some were more reliable than others – Tiara and Silver at least had very clearly been mostly interested in her cock. Twist, likewise, would probably have slept with her regardless of how attractive she was. But then there was Noi, who had outright stated she’d wanted to have sex with her for years. Years! There was no way Dinky could rationalize that statement as being the result of her new addition.

And here was Snails, about to masturbate to her. Somehow, Dinky got the impression that her little friend had nothing to do with that either. That Snails would have happily jerked it to her even before it had happened. That, perhaps, he had jerked it to her before it happened. That he wasn’t the only pony who had. “I’m not the only pony who thinks so, if it helps. You’re really popular with the boys. And a lot of the girls also,” Snails interjected, all but confirming that line of thought as accurate.

“Oh, um. Okay.” It was Dinky’s turn to blush.

“Oh, sorry, I didn’t mean to be all weird about it! I can stop if it’s making you uncomfortable”

“Oh! No, no don’t stop!” Dinky’s voice was tinged with a desperation that caught her off guard. Being told that she was attractive felt good. Really good. Her face was suddenly flushed with arousal, and her breathing had become erratic even as she found her hands wandering to her cock. “Keep going. Please.”

“Uh, are you okay?” Dinky nodded furiously, and so Snails continued on. “Like, you’ve... kind of always been one of the prettiest girls in school. I used to have a crush on you, actually. Would you believe I used to ma, uh. You know. To you?”

The confirmation was like a jolt of electricity down Dinky’s spine. “Really?” she managed to force out, her voice quiet and strained.

“Yeah,” Snails replied quietly. It was his turn to blush furiously, and he once again looked away from her nervously. He was so fucking cute when he was nervous. “Like a lot. Um, I’ve mostly stopped because it’s kinda creepy, but... I’ve ruined a lotta socks thinking about you. Was that a creepy way to say that? If it helps they were old and had big holes in them anyway.” Even as he spoke, he slowly pulled his panties down to unleash his sock ruiner. It was, unsurprisingly, put to shame by Dinky’s member, but would probably have been bigger than hers before Tiara and friends had had their collective way with her. Its pale amber length was about a foot and a half long, large enough that it smacked him in the dead centre of his chest when he freed it from his panties. Everything else about him was so unrelentingly feminine, from his plump and pouty lips to his childbearing hips and big slutty ass. But then there was this gigantic bitch-breaker between his legs.

Dinky had never really thought of Snails in any kind of sexual context until this moment. But now that she had seen him in this light she couldn’t imagine him as anything else. The cute, innocent girl next door with an ass that wouldn’t quit and a cock the size of his forearm. Sitting on her bed in slutty underwear, literally asking her to use and abuse him as she saw fit. Her cock twitched, giving her a good smack in the face that was enough to dispel her remaining hesitation.

She wanted him. Desperately.

“Stop,” her libido said as it lifted her out of her seat and dragged her towards her bed.

“Huh? Okay.” Snails reluctantly removed his soft hands from his drooling cock.

“I think I’ve changed my mind about the level of involvement I wanna have.” Dinky’s libido grinned eagerly as she gave Snails a gentle shove that was enough to knock him over onto his back. “I figure that if cummin’ with my cock makes me bigger, cummin’ with my cunt won’t do anything. What do you say, wanna live out your fantasy of getting your face sat on by your childhood crush?”

“I dunno,” Snails muttered hesitantly. “Are you sure you actually want this? You’re acting kinda weird all of a sudden.”

Dinky paused, briefly shoving her libido out of the driver’s seat. She didn’t really want this, did she? Honestly, she wasn’t even sure anymore. Thinking back on it, the whole reason this had happened was because she’d done a piss-poor job of denying her attraction to Noi, and. Well. Look where that had gotten her. “I... Fuck. I have no idea anymore,” she finally managed to say, turning slightly to sit on the bed beside Snails. “I’m pretty sure I don’t want this, at least,” she added, gesturing at her cock. “But everything else... Fuck.”

“Wanna talk about it?”

Dinky sighed. “It couldn’t hurt, I guess, but I don’t know what it even is.” She threw her hands in the air in exasperation, flopping backwards onto her bed. The movement of her body caused her still very erect monster of a penis to sway slightly like a tree in a gentle breeze. “Like, I sort of know how it works at this point but I still don’t really know why. That’s the most frustrating thing. It’s like, one moment I’m living my life and the next I’ve got a gigantic penis out of nowhere.”

“I can see how that’d get in the way of your normal routine.”

“And like the worst thing is that it feels really good. I can’t even really properly hate the stupid fucking thing for completely fucking up my life because I’m too fucking horny all the time to think straight!” Dinky flailed slightly, the slightest movement of her body enough to send the pillar of flesh jutting from her cock swaying rhythmically back and forth. She groaned, partly out of frustration and partly from the fresh spikes of stimulation her cock’s motions sent through her body. “At this point I wouldn’t even mind that much if it would at least go away when I don’t want it!”

“Well, when do you want it?”

“I don’t know! Whenever I wanna fuck, I guess. But I don’t even know when that is because the stupid thing makes me horny all the time!”

“Hm,” Snails mumbled thoughtfully. “Hey, this might be a dumb question, but have you tried, you know, taking care of yourself?”

“Sort of, but I got interrupted by Tiara, and then I got trapped in an orgy and then I went to bed and then now.”

“Well then maybe that’ll help? Like, if everything you’ve tried with a partner has made it worse, maybe just doing it yourself will let you properly blow off some steam.” He shrugged slightly. “I dunno, it prolly won’t work, but it’s better than nothing.”

Dinky sighed. “I might as well try it. We’re gonna hafta convince Tiara we fucked anyway or we’ll never hear the end of it. Actually cumming’ll probably make that easier to do.” She pushed herself back into a sitting position. “You wanna go first? Or should I?”

“We’re both gonna hafta go eventually, might as well deal with it at the same time.”

“Right,” Dinky muttered in reply as her eyes darted to look at Snails’s cock of their own accord. “Just, uh, gimme a minute to get back in the mindset.” She had managed to, if not calm down, then at least push her libido out of the front seat. She was fairly certain she could jack off on her own, but she was also fairly certain that her libido would end up taking charge again anyway, so she might as well let it take the steering wheel from the beginning. She closed her eyes, took a deep breath, and let it happen.

It was her libido that opened her eyes. Dinky felt a strange sort of dissonance, like she was merely a passenger in her own body but at the same time was completely in control of herself. She was moving on autopilot, and autopilot was staring intently at the flared cockhead in the dead centre of her field of vision. The fact that it had grown to the point of being eye-level hadn’t really registered until now, but there it was, drooling enticingly. She reached out and grasped it near the medial ring – it was thick enough that she had to use both hands in order to get a good enough grip on the thing to begin pumping. Up and down, slowly and languidly for now so that she could enjoy the sensation of it throbbing and pulsing against her firm grip, hot and musky pre drooling down its length and over her fingers. Idly, she pulled the shaft closer and gave it a gentle kiss, followed by a tentative lick.

Her precum was hot, musky and salty and spicy and bitter and she wanted more. She leaned in for another lick, no longer tentative but eager, her tongue dancing along the length and around the head even as her hands continued to pump. God, it tasted so good. The dregs that she was managing to catch with her tongue weren’t nearly enough. Still acting purely on instinct, she opened her mouth as wide as she was capable of and darted forward, taking her entire flare into her mouth. Somewhat obviously, she’d never even considered the possibility of sucking herself off in the past. Obviously, considering her cock was a recent development, but beyond that she hadn’t entertained the thought of it being a thing anyone might do, ever. And she’d definitely not considered the possibility after sprouting her little new addition. She hadn’t really considered much of anything, of course. She had mostly been focused on avoiding sex acts, understandably.

But if she had to get off, it might as well be enjoyable. And this was very enjoyable. Her cock throbbed in her grip and drooled copious amounts of precum down her hungry throat. It dawned on her that she hadn’t actually really eaten anything since the incident, and idly wondered where all of this stuff was even coming from while she sucked her cock. She moved up and down its length as much as was possible given its extreme size and her own relative lack of flexibility, and made up for the difference with her hands, pumping the thick cockflesh up and down. It wasn’t perfect, but it was clearly more than enough. She could feel the distressingly familiar feeling of a brewing orgasm in the pit of her stomach. Her balls clenched, her hips thrust, her horn unleashed several small showers of golden sparks, and finally pattern recognition set in.

Dinky abruptly pulled back, her flared head exiting her mouth with a loud, wet pop. “Fuck, that’s not gonna work,” she grunted.

“It’s not?” Snails sounded almost disappointed. She hadn’t exactly been paying him any mind, and even now she was more focused on the situation at hand than she was her erstwhile companion. She idly noted that he’d been playing with himself while she’d been occupied, but didn’t have the time to consider further. More sparks leaped from her horn, and several large arcs of precum erupted from her cock as she found herself passing the point of no return, barrelling her way along the express line to cumville.

“Oh, fuck, it’s not stopping,” she groaned, finding herself not entirely minding. On an intellectual level it was intensely irritating, of course, that she was going to get bigger again. But on another, deeper level, she felt oddly at peace. She felt like she was getting closer and closer to figuring this whole thing out. What was really happening, and maybe how to fix it.

Of course, unsurprisingly she found that train of thought derailed right as she was getting close to a breakthrough. “Hold on, Snips taught me this trick a while back!”

“What are you- gah!” Snails’s horn erupted with its own aura of bright green that matched his hair and eyes, and suddenly Dinky felt her building orgasm just stop. “What are you doing?” she forced out. She could still feel it there, lurking dangerously, like it had somehow been frozen in time right before it could properly go off.

“I’m sort of holding it in. It won’t last forever but it should last long enough for me to just...” He yanked his panties the remainder of the way off and tossed them aside, rushing forward towards Dinky.

It took her a moment to realize what he was planning, and by then it was far too late. “Snails wait no that’s not gonna-”

She was cut off by Snails slamming his huge ass down right on her cock. She entered him in one fluid motion, which was honestly quite impressive. Probably the result of some form of enchantment on his underwear or a piercing she’d overlooked. He was tight, unbelievably so. Like nothing she’d ever felt before. Sex with Tiara and Silver paled in comparison to anal with Snails. Her conscious mind was washed away by a flood of lust and need, and once again her libido took over. She firmly grabbed his wide, feminine hips and fucked. The amber sparks from her horn became jets of magical energy and flashes of light, like nothing she’d seen before. “Coooooock,” she groaned as the two of them flopped forward, Snails winding up on all fours on the ground being absolutely railed from behind by the larger mare.

“Gnhaaaa, you’re good at that,” Snails forced out through gritted teeth, his horn still surrounded by emerald light, though the glow of magic was flickering and fluttering as his concentration began to fail him. “Hold on let me just let up on the block a bit, we can see if taking it slow helps any-”

“CooOOOOOCK!” Dinky roared. There was a flash of golden light that filled the entire room, and a loud snap as the sheer force of her orgasm broke through Snails’s spell. Her cock unleashed enough cum to make her previous climaxes look like fucking nothing in comparison. Snails gagged, coughing up gobs of the stuff, and still his body inflated as more got pumped in. His own cock erupted, spraying the floor of Dinky’s room with a good few spurts that paled in comparison to her inhuman output.

And, of course, she grew. It somehow felt different than the last times. More. She wasn’t sure why, and she didn’t really care because frankly this whole thing hadn’t followed consistent rules since the beginning, seeming to change how it worked every time she thought she’d figured it out, and frankly it was no longer worth the bother trying to work them out. All she knew was that she was getting bigger, again, and moreso than before. The usual five inches came and then went as she lurched bigger in time with the flashing of her horn.

Her conscious mind managed to wrest control back from her libido in a blind panic – sure, Snails was obviously unusually stretchy, but she didn’t know for sure how much he could take and didn’t want to risk hurting him. She firmly grabbed his ass and pushed him off her fourty five inches and growing. She flopped backwards onto her own ass, still cumming and still growing, while Snails rolled forward on his gravid belly, groaning and cumming in a way that was unsurprisingly reminiscent of what had happened after she’d cum inside Tiara for the first time.

He moaned and groaned and burped as his belly slowly deflated, the mass seeming to migrate to other parts of his body. His already pillowy ass gained an extra layer of padding, and his hips widened, but the real change was up top. His camisole strained as it found itself slowly filled with orange titflesh. “ohfuck,” he hissed as he grabbed a swelling orb, already past budding and into large and still growing, while his free hand wandered its way down, below his cock and behind his balls, to slip several fingers into his brand new cunt because of course he’d gotten a cunt that just made sense.

Dinky felt herself slowly coming back into lucidity. Her head hurt, a dull, throbbing pressure in her sinuses as her cock unleashed the last few gallons of seed. “What the fu- you know what? Never mind. I don’t wanna know what the fuck.” She stared in dull horror at the behemoth that was attached to her waist. It was, she supposed, probably still smaller than Tiara’s, but not by very much. Likely just a bit over four feet, which meant it had grown about four times as much as it normally did. “God dammit, I can’t even get mad anymore,” she managed to say, shoving her chair out of the way so she could lie down in exhaustion. “How’re you holding up, Snails?”

“Mnf,” he responded sheepishly. “That, uh. That felt really good.”

“Sorry about the, uh, you know.”

“No, it’s fine. I’m going to hafta get all my clothes re-tailored, which is expensive, but at least I’ve kinda got no more excuse not to wear cute outfits in public?”

Dinky shoved the beast out of the way and lazily lifted her head to look at Snails. “I hope you’ve got some concealer panties.”

“I’ve got, uh, an extensive collection,” he replied, blushing.

“... Do you want me to start calling you she?”

“Oh! No, no, it’s fine, I’m not.. you know. It’s just...” He blushed furiously, looking away from Dinky. “It makes me feel pretty.”

“Fair enough,” Dinky replied, happy to drop the subject. “Do you think this is gonna be enough for Tiara?”

“Prolly. I’d, um, kind of like to go again, but I don’t think that’s the best idea.”

“No. No it isn’t.” She sighed. “For what it’s worth, you make a cute girl and if it were any other situation I’d be okay with a little experimentation. I guess.”

“Really?”

“Yeah. Just, uh. Not now.” Dinky should, she supposed, ask if Snails was going to be able to make it home. His new figure likely left him somewhat unable to wear his street clothing, and getting home looking like he did now would be... problematic. “Hey, uh, are you-”

Once again, following a frustrating trend, Dinky found herself interrupted by the door to her room swinging open. “Hey, Dinks! Sorry I’ve not been around, it’s just-”

Noi’s sentence dried up in her throat as she stared in quiet awe at the spectacle before her. “Wow. Okay. I’m gonna need some context, stat.”

Complications

“Wow. Okay. I'm gonna need some context, stat.”

In retrospect it wasn’t really very surprising that Noi had picked this exact moment to swoop back into Dinky’s life. Considering the general direction her luck had been trending in for the past few days, it would have surprised her if she didn’t get a potential worst case scenario. Of course on the other hoof she couldn’t really think of a potential pony to barge in at the present moment who wasn’t a worst case scenario. If anything, Noi was probably one of the best case scenarios, which was a depressing realization. Certainly, thinking about things objectively she would much rather get Noi than Diamond Tiara. Or Sparkler. Or, god forbid, Derpy.

But, well, Dinky wasn’t really in a state of mind to think about things objectively. “Fuuuuuuuuuuuuck,” she groaned. Not a moan, that was an important distinction. She’d been dropping a lot of long-drawn out f-bombs in the past few days, so it was important to distinguish this one as being motivated by irritation more than arousal. She flopped backwards onto her bed, sprawling as best as she was capable of with a cock almost as big as she was.

“I think it’s prolly a little bit early for that.”

“No, no we’re not doing this right now. Come back in like a week”

“That seems like a bit much of an overreaction, Dinks.”

“Please pass me a pillow so I can smother myself with it.”

“Uh,” Snails interjected awkwardly. “Uh, should I go?”

“No, don’t- at least wait until we figure out a reasonable clothing solution for you.”

“So who’s the cutie? And would you mind terribly if I borrow her for a bit?”

“Ugh,” Dinky groaned, burying her face in her hands. “No, Noi, you can’t fuck Snails.”

“Wait, that’s Snails?” She stared, dumbfounded. “Uh wow. Okay. Uh. Yeah, remember when I said I needed some context? Because I need some goddamn context.”

“It’s a long story.”

“I have free time.”

It was, in fact, quite the long story. Dinky initially attempted to expedite things by sticking to the immediately relevant, and then quickly realized that wasn’t going to be an option as first she needed to explain why Snails had been sitting on her face and then she needed to explain where Tiara came from and suddenly she found herself all the way back at Doctor Horse’s office. At which point she had essentially just started at the beginning anyway. So she just told the story from the beginning, with occasional interjections from Noi and Snails.

“And that takes us to the present. The terrible, terrible, terrible present.”

Noi snickered. “It ain’t that bad, Dinks.”

“Tell that to the four foot cock.”

“Hold on, I’m gonna take my pants off.”

Had Dinky been drinking, she would have done a spit take. As it was, she did an admirable approximation, gagging on thin air. “Wh-why?”

“I wanna sit down beside you, duh.”

“You can do that with pants on!”

“Hon, your bed’s kinda cummy.”

“Yeah, well, when have you given a shit about wearing clean clothing.”

“I do gotta go home eventually.”

“oh my god you can borrow my sweatpants or Snails’s casual clothes or something just-”

“Nope, too late, I’ve decided to take off my clothing.”

“Dammit.”

Dinky had to reluctantly admit that, under other circumstances, she’d probably be one hundred percent down with watching Noi take her clothing off. As of now she mostly just tried not to look. She was already cripplingly aroused pretty much all the time, and watching Noi take her clothing off would almost certainly make things worse.

Of course, she completely failed to avoid looking. Noi moved quickly, sliding her shorts down over ample hips, thick thighs, et cetera. She was, unsurprisingly, going commando, confirming that she had in fact gotten her clit pierced. Dinky winced slightly at the sight, while Noi seamlessly transferred into removing her tank top. “Hey!”

“What?”

“You said pants, not all clothing!”

“I absolutely said I decided to take off all my clothing.”

“Okay but why it’s not like your shirt’s in danger of getting cum on it if you sit on my bed.”

“Yeah, but you’re naked and Snails is basically naked. It kinda feels weird to be the only fully dressed one, y’know?”

“Celestia fucking help me, Noi, I’m gonna kick your butt after all of this is done.”

“Understandable.” Noi tossed her shirt away (ironically, it landed in a stray pool of cum) and flopped down onto the bed. “So, like, let’s brainstorm.”

“Brainstorm what.”

“How to get rid of your dick, duh.”

Dinky groaned, again, as she slowly pulled herself into a sitting position. “Yeah because that worked so well every other time.”

“It’s been like a week and you’ve still got it, I don’t think it’s gonna go away on its own, babe.”

“It has not been a week.”

“A whole month of cock.”

“Noi it’s been like three days top.”

“Twooooooooo hundred years.”

Dinky rolled her eyes. It wasn’t the first time they’d done a variation on this exact bit. She’d always thought it was kind of dumb, but Noi claimed that playing the straight man was her way of playing along. Nonsense, of course, but she had to admit that it was weirdly endearing. “Okay, well, do you have any ideas?

“Well, let’s look at what we’ve tried before.”

“The fuck do you mean ‘we’ I haven’t seen you since this shit started.”

“I had school and you were unconscious like every time I tried to visit!”

“Okay, okay, fine, I forgive you and am willing to pretend you have participated in getting me out of this mess outside of literally right now.”

“As you should! Anyway, let’s look at what we’ve tried before.”

“Well, uh.” Now that she was actually trying to think about it, she hadn’t really tried an awful lot besides waiting for it to go away. “Hm. Well, I’ve tried waiting, obviously.”

“And it’s been two point five billion years, so-”

“And I’ve tried masturbating and that just made it worse.”

“Hey don’t interrupt my brilliant comedy.”

“And it doesn’t really count as something I’ve tried but I should prolly add that I’ve done a whole fuckton of various sundry sex acts and none of them worked.”

“Plus whatever Tiara and her friends tried while you were asleep!” Snails interjected.

“Do those really count tho? I mean, Dinky’s clearly the source of this whole mess so it makes sense that it wouldn’t end if she wasn’t involved.”

“Yeah but that doesn’t really narrow it down much either way,” Dinky added with a shrug. “I’ve done pretty much every available hole short of like really weird shit like, I dunno, nostrils? Or something?”

“I gotta tell ya’, I’m not really keen on the prospect of nostrilfucking.”

“Yeah, uh, me neither.”

“It’s unanimous, then. No nostrilfucking.”

“Okay then,” Snails said, speaking slowly. “What haven’t you tried?

“Hm,” was all Dinky could reply with. It wasn’t really that difficult of a question. Or it shouldn’t have been. “Well, I guess sex acts are probably outta the picture.”

“Maybe, like, try and uncast the spell?”

“No, that’s prolly a bad idea. Doctor Horse said that I’d need a specialist or I’d risk burning out my magic forever.”

Snails winced. “Ech. Yeah, better be careful.”

“Yeah okay, but there’s gotta be something. You of all people should be able to untangle your own magic. Maybe a shrinking spell or something?”

“I don’t know any shrinking spells.”

“Fair enough. Is there anything not magic you can think of to try?”

“Nope.”

“Well,” Snails interjected after a moment of silence. “Maybe we’re looking at this from the wrong direction.”

“How d’ya figure?”

“Well, as far as I can tell, everything Dinky’s tried has been, well, trying. If that makes sense.”

“It doesn’t, really,” Dinky replied after a moment’s thought.

“Well, like, when you were masturbating you weren’t really masturbating, right? You were trying to get rid of your cock.”

There was another pause as Dinky thought. “Okay,” she said slowly. “I think I get it, but I dunno where you’re going with this.”

“Maybe try, like, just jerking for the sake of it?” Noi suggested. “Don’t try and get rid of the dick, don’t even think about the dick for now. Just, like, take five-” she paused, looking Dinky’s cock over for a second. “Take twenty minutes or so to let off some steam.”

“I don’t think I could not think about it if I wanted to,” Dinky replied. “I mean fuckin’ look at it.”

“Fair enough.”

“I think I’ve got an idea,” Snails interjected once more. “It might take some doing, though.”

“At this point I’m willing to try just about anything that looks like it might work.”

“Well, why don’t we try hypnotizing you? Like, if the problem’s got to do with your subconscious why not just directly ask your subconscious what it wants?”

“That sounds like a terrible idea,” Noi responded immediately. “Like, literally asking for something to go horribly wrong.”

“It’d depend on who we ask to do the hypnotizing,” Snails replied. “I’m not doing it, I don’t know any hypnosis spells and this is too big a deal to ask someone who doesn’t know what they’re doing.”

“Okay, but do we know anyone who knows how to hypnotize ponies?” Dinky said. “Because if we don’t then I dunno if the whole plan’s even worth considering.”

“Well, Princess Twilight-”

“Nope.”

“She’s been teaching basically every unicorn in town magic for, like, years.”

“Exactly the problem! She probably barely knows my face, let alone my name. Besides, she’s a princess. She’s pretty much always busy.”

“Well,” Snails said. “If not Twilight, why not the next best thing.”

“What do you mean ‘the next best-’ wait.” Noi frowned deeply. “Oh. No. No no no no no, out of the question.”

“Why? Okay, yes, she’s a bit... bombastic, but this kind of thing is basically her specialty!”

“Bombastic is not the word I’d use to describe her.”

“Well, do you have any better ideas?”

“Plenty! We live in Ponyville, for crying out loud, basically everyone’s got a connection to someone with a connection to Twilight or even Princess Celestia or Luna or Cadence! Or all of them!”

“I’m going to call her up,” Snails said petulantly.

“No! We are not calling her up!”

“Noi, stop,” Dinky interrupted.

“Oh come on you can’t seriously be considering-”

“Unlike the princesses, this is someone we’ve got a direct connection to through Snails. Besides, it’s like I said. At this point I’m willing to try just about anything that looks like it might work.” She grimaced slightly. “Even if it means having to deal with The Great and Powerful Trixie.”

---

Trixie wrinkled her nose slightly upon entering the room. “Ech,” she grunted, before snapping her fingers. There was a flash of purple, and suddenly all the many many many gallons of spilled cum were gone. “There. Much better. Trixie can concentrate now.” She strode into Dinky’s bedroom proper, her cape billowing behind her, blown by a wind that didn’t actually exist.

“Uh, Miss Trixie? You probably don’t need to bother with the wind spell. It’s just us three here.”

“The Great and Powerful Trixie must always pay careful attention to Aesthetics when an audience is present, Snails,” Trixie responded in that quintessentially Trixie way. “Even if that audience is three ponies. Now, let’s have a look at the patient.”

Dinky once again found herself desperately trying to find somewhere safe to look. Noi was still completely naked and still insufferably hot. Snails might as well have been naked. His panties had long since vanished into the aether of cumsoaked clothing somewhere on her room’s floor – which Trixie had teleported into a neat little pile of laundry in the corner – leaving his wide hips and ample ass and sizable manhood bare for the world to see. Not that they would have done much, as his top demonstrated. Even if his pink camisole wasn’t already see-through, it barely did anything to conceal enormous tits that made Noi’s look practically average. And, of course, right front and centre was a mare who frankly put both to shame. Her breasts were around the same size as Noi’s, perhaps slightly bigger. It was difficult to judge, because unlike everypony else in the room she actually had goddamn clothing on, sort of. A tight-fitting and skimpy leotard, the same star-patterned deep purple as her cape and hat. It dug tightly into soft thigh and ample bosom in a way that was honestly worse than Dinky’s mostly nude friends.

“Well,” Trixie said after giving Dinky a brief once-over with her eyes. “At least the problem is somewhat obvious. You’ve made a bit of a mess of yourself, haven’t you?”

“I guess?”

“There’s something of a knot of magic tying you to your, ahem, stallionhood. And from there tying your stallionhood to others. Snails, possibly more. It seems like whatever spell you’ve managed to cast is contagious. Which, in case you haven’t realized, is very bad.”

“Wait, hold on, it is?”

“This isn’t just a one-off grow-a-penis spell,” Trixie said with uncharacteristic solemnity. “It’s a constant process. The spell you managed to cast is maintaining itself, constantly, and it’s getting stronger as it spreads to more ponies. Which is making that maintenance much more costly to you.” Trixie clasped her hands together in front of her mouth. “Likely your doctor wouldn’t have noticed, especially not if it hadn’t yet started spreading. This isn’t something a small-town medical doctor would be trained to notice. I assume he told you it would eventually go away on its own?”

Dinky nodded dumbly. “Yeah. He said that trying to get rid of it without a specialist could make me not able to do magic anymore.”

“Well, he was right about that last part at least, but this is much more urgent than he likely realized.”

“How urgent are we talking here?”

“Very,” Trixie replied succinctly. “It’s a very good thing you called me in.”

“You can fix this?”

“No. This is going to require an Alicorn. What I can do is help your friend get a little, ah, nap. To help keep things from escalating further while I get in contact with Twilight.”

Noi threw her hands in the air in mild exasperation. “I told you we should have gone to Twilight!”

Trixie shook her head. “No, unless you could have gotten her to look at Dinky in person then she likely would have given you the same advice as your doctor. And given her condition I don’t think that was particularly likely. That’s why it’s a very good thing you called me in. I know enough to immediately recognize the problem and I have the connections to be able to properly stress the urgency of the situation to Their Majesties.”

“Oh.”

Snails grinned smugly. “Toldja.”

“Anyway,” Trixie said, getting as close to Dinky as the massive penis allowed and kneeling to roughly eye-level. “Best not to delay.” She snapped her fingers once again, and a large gold coin attached to a silver chain appeared in her hands. “I’m going to put you into a trance now. As I said, it will hopefully prevent things from getting worse until we can get a Princess here to untangle things. And if we’re very lucky, confronting your subconscious might help you overcome whatever issues resulted in the initial miscast.”

Noi frowned slightly. “I thought you were gonna be doing, like, a spell or something. Not carnival trick hypnosis.”

It was Trixie’s turn to be smug, closing her eyes and smirking, wagging a single finger in the air as she spoke. “Oh ye of little faith! It’s never a wise decision to underestimate The Great and Powerful Trixie.”

“Whaaaaaaatever, man.”

“Now, Dinky. I trust you’ve seen this kind of thing before?”

“Yeah.”

“Good, then I don’t need to explain too much. Just keep your eyes on the coin and focus on my voice.”

“Okay.” Dinky frankly lacked the energy to argue, or to do anything other than what she was told, really. Which, she realized, was probably a bad sign, given what Trixie had revealed. Besides, she had agreed to try anything. But, well, the whole magic coin thing really only worked because of the placebo effect and a bit of sleight-of-hand. She knew that, which meant that the coin wasn’t going to work on her. Hopefully Trixie had a bit more up her sleeve.

Trixie lifted the coin up and then let it drop, holding onto the chain and let inertia do the rest. Unlike the stereotype, she didn’t bother to swing it, instead letting it dangle motionless in front of Dinky’s face. Well, not entirely motionless. It jiggled and swayed, as a result of residual movement from the drop, the subtle unsteadiness of Trixie’s hand, the ambient motion of the atmosphere in Dinky’s room. But they weren’t the steady, rhythmic swaying motions of the stereotypical hypnotist. They were barely motions at all.

“It’s important that you relax,” Trixie said, her voice soft and smooth, a far cry from the showmare’s trademark bombast. “Try not to think. Just let everything wash over you. We’re trying to get at your subconscious, and we won’t be able to do that if your conscious mind gets in the way. Don’t think about my voice. Don’t think about the hypnosis. Don’t think about the coin. Don’t think. Just let it happen, and it should come naturally from there.”

“Okay,” Dinky replied. She did as she was told and tried to focus on the coin without thinking about the coin. Which was difficult, if not impossible. She had already failed miserably at not thinking about Trixie’s voice, considering she was following the magician’s advice. She couldn’t imagine how it could be possible to focus on the coin without focusing on the coin. It didn’t help that Little Dinky had decided that it had been far too long since he’d gotten to have fun, and decided to complain about it. Loudly and emphatically. It was hard to focus on anything.

Well, almost anything. Trixie’s position relative to Dinky left her at eye level with the coin, yes, but also at eye level with Trixie’s breasts. They were, as Dinky had noted earlier, quite ample. In spite of her somewhat notoriously abrasive personality, Trixie was a very attractive mare overall, but the breasts were definitely the star of the show. It probably helped – or didn’t help, rather – that her leotard was rather tight-fitting, especially up top. It dug into soft flesh in a very tantalizing manner. Given the choice between focusing on the coin and focusing on Trixie’s boobs, Dinky found herself constantly drifting away from the former and towards the latter, no matter how much she tried otherwise. They rose and fell slowly, to the rhythm of her breathing. In and out, up and down, and all the while they strained against her clothing.

God, they were so fucking big. Dinky couldn’t help but reach out and touch them.

“Stop.”

Dinky did as she was told, her hands freezing inches from Trixie’s chest.

“Hands at your side.”

Dinky obeyed.

“There we go.”

“Did... did you seriously just hypnotize Dinky with your tits?”

“I improvised,” Trixie replied with a smirk. “Due to the, ah, nature of the problem, I assumed Dinky would most naturally be drawn to focus on certain specific aspects of my body anyway. Add in a bit of misdirection and a little magic to help things along while she was distracted and I’ve got her under in record time.” She stood up, posing dramatically. “Like I said. It’s never a wise decision to underestimate The Great and Powerful Trixie!”

“Whaaaaaaatever, man.”

“As for you,” Trixie said, turning back to Dinky. The young mare sat on her bed lifelessly, staring listlessly at nothing in particular. “I suppose after we’re done I should really allow you the opportunity to have a little fun with Trixie’s breasts, it’s only fair. But for now I need you to lie down and go to sleep. By the time you awaken, your little problem shall hopefully be well and truly solved.”

---

Ideally, it would have been as simple as that. Go to sleep and wake up a few hours later de-dicked by whichever Princess had shown up first. She wouldn’t have had to worry about having an enormous growing penis that was apparently slowly killing her ever again. A simple solution that satisfied everypony involved. Then maybe confess her love for Noi and have a small orgy with the two of them plus Trixie and Snails and whichever Princess had done the de-dicking. Of course, that last part might have been the still-present dick influencing her thoughts. Part of her, she supposed, had had enough sex to last a lifetime. But then again, even if it was her cock speaking, she didn’t exactly mind the idea of having sex on her own damn terms.

All of that was assuming that things went as she’d expected them to, of course. And, to no one’s surprise, least of all Dinky’s, that wasn’t how things appeared to have played out. Of course it wasn’t. That would have been easy.

“I guess I’m dreaming?” she muttered to herself as she took in her surroundings. The first thing that she noticed was that she no longer had a penis. Which made sense, she supposed, since this was a dream. Or possibly some kind of hypnosis-induced vision quest. Or something. She didn’t pretend to understand the science or the magic involved. All she knew was that she was the default Dinky, the way she was most of the time when not saddled with an impractically large cock.

Her surroundings, meanwhile, were unfamiliar. Which was odd, now that she thought on it. This was her dream, right? Maybe her imagination was better than she’d given it credit for, or maybe it had something to do with the magic, but normally her dreams took place in relatively familiar surroundings. If not actually her home or school or places around Ponyville, then at least places that felt like home or school or Ponyville. This, though, did not. It didn’t look like Ponyville, it didn’t feel like Ponyville. It felt cold. Unsettling. Barren and lifeless. Decidedly not anything she might have expected given the setup.

It was night, though it wasn’t particularly dark. Pale blue moonlight lit the rocky landscape unevenly. Shadows caught in the nooks and crevices, extending outwards like some tired metaphor or another. It all felt very ominous and symbolic and frankly Dinky really didn’t have the patience for it. Frowning slightly, she began to move forward. If this was a dream (and it was, she was fairly sure), then it probably didn’t matter where she moved so long as she moved. Given how rough the terrain was, it was surprisingly easy to traverse – which made sense, considering it wasn’t fuckin’ real. Still, she didn’t really seem to be making any actual progress. Which was frustrating. She wanted this over with god dammit, especially if it was gonna kill her.

Dinky wasn’t entirely sure exactly how long she spent wandering. It at least wasn’t inconvenient to traverse, but the fact that it took so damn long was inconvenient in and of itself. “Okay, maybe I need to come up with a different tactic,” she muttered to herself. “I know this is a dream, right? So I could, like, lucid dream it or something?” She stood in the middle of the vast, rocky wasteland, silently contemplating. “Okay, so then the next question is... How do I do that?”

Unsurprisingly, nothing happened. She had no idea if attempting to control her dream was the right track to be on or not, but it didn’t really matter if she couldn’t figure out how to control her dream in the first fucking place. “Ugh,” she grumbled. “Okay, need a new new plan. Uhhhhh... Nothing’s coming to mind.” She stood dumbly, completely at a loss for what to do.

She could, she supposed, just... wait for the inevitable Princess to show up and solve things. But who knew how long that would take, and she felt like she should be doing something in the meantime. And the fact that there didn’t seem to be anything to do was frustrating, to say the least. This whole situation was frustrating, really. Here she was, sitting around with nothing to do while a spell she hadn’t meant to cast and which she shouldn’t even have been able to cast in the first place slowly drained her life away and there was nothing she could do to stop it but wait. Trixie had said something about confronting her subconscious and overcoming her issues, but that was going to be kind of difficult if her subconscious was nothing rocks and more rocks.

“What does this even symbolize? Does it even symbolize anything? I feel like it should probably symbolize something.”

“You’d be surprised, actually.”

Dinky jumped slightly in surprise at the sudden interjection. “Ack!” Jumping, it turned out, was not a great idea, as she ended up catching her foot on a rock and falling onto her face. It didn’t hurt, but it was a bit undignified.

“Oh, sorry.”

“It’s fine,” Dinky said, slowly pulling herself back up. “At least I’ve got someone to talk to.”

“That’s good,” replied the intruder. Dinky had a pretty good idea who it was without even looking. “You are... Dinky Doo, correct? I am Princess Luna.”

“Yeah, I figured. It’s daytime and I’m asleep, sort of, so you make the most sense.” Dinky had never actually met any of the princesses aside from Twilight in person. Or at least not close up. She’d seen them on the various occasions they’d visited Ponyville for whatever reason, but she’d never actually gotten up close and personal with any of them outside of the occasional magic lesson from Twilight – and even then, that had been as a part of a group of ponies. Besides which, Twilight was much younger than the other three, and much less powerful. Intellectually, Dinky knew that Alicorns were typically quite large, especially the elder two.

But, well, knowing was one thing. Seeing was another entirely. Dinky was not exactly a tall pony – about average. Princess Luna decidedly was large. Very nearly twice as tall as Dinky, wide and soft in just about every way. Almost chubby. Her breasts were huge and her hips were wide and, of course, she wasn’t wearing any clothing. That particular fact almost seemed to catch her off guard – she raised a quizzical brow. “I suppose this makes sense, given the nature of your issues as I understand them. Come, let us talk about it in further detail somewhere more comfortable.”

The dream environment faded away, replaced by what seemed to be a very large bedroom, clearly built for someone of Luna’s stature rather than someone of Dinky’s. Everything was big, decorated in dark blues and purples and blacks and lit up with soft, warm candlelight. Luna strode over to the massive bed in a few short steps, sitting on the edge and patting the space beside her. Dinky scuttled over significantly less elegantly, and climbed her way up to the spot the Princess had indicated. It was surreal, like she was a child again.

And also kinda hot, in a weird sorta way. Probably had to do with the sheer magnitude of boob and butt that inherently resulted from Princess Luna’s raw size. She had reasonably ample proportions, probably around the same as Trixie’s, but Trixie was around the same height as Dinky while the young unicorn didn’t even reach Princess Luna’s god damn navel.

“So, uh... you’re gonna fix the problem, right?”

“Yes. But first I’d like to try and ensure that this doesn’t just happen again.”

That was decidedly not something Dinky wanted to hear. “You mean this could happen again?”

“Until your magic channels finish growing in, it’s a very real possibility that your body may react to strenuous sexual situations in the same way, yes. Unless we can deal with the root of the problem, as it were.”

“Okay, cool. How do we do that?”

“Well,” Luna replied, after a moment’s thought. “I think I have a few ideas. The most important thing is figuring out what the root of the problem is, and from there it’s really up to you.”

“Yeah. Yeah, okay, figures.” Dinky was fairly sure she knew what was coming up next.

“Put bluntly, from my understanding of the situation, you need to get more comfortable with sex.”

“I’m plenty comfortable with sex.”

“Clearly not,” Luna said, unimpressed. “Now is not the time to be coy, child. Don’t worry, this is a safe space. This conversation is safely between you and me. No one else can hear what you have to say, and I am duty bound to keep your secrets.”

“Okay...” Dinky said, unconvinced. She had been dreading this part since before she’d even realized it was coming. “But, like, it’s not that simple. I know I’m anxious about getting pregnant, right? I know that it’s irrational. I know that it’s not that hard to avoid getting pregnant and I know that I’m mostly past the point where it’d be irresponsible anyway. But that hasn’t stopped it.”

“Well, that may be the case in the real world. But we’re not in the real world right now.”

“Huh?”

“Time moves differently in dreams. What might take seconds in the dream world could be hours in the real world, and what might take hours could be seconds. And this is, ultimately, my dominion. We have as much time as we need, I promise you.”

“Okay, cool. How does that help?”

“Well, for starters,” Luna said with a sly smile. “You certainly seem to be awfully interested in my body. And you did dream me naked.”

“Um.”

“It’s not often I get to visit the dream of a foal who is of legal age. I’m a little bit pent up, if you’ll forgive me.” Luna reached over and gently placed a hand on Dinky’s shoulder. “I won’t force you, of course. But I believe some consequence-free sexual catharsis would do you a world of good as a first step.”

“Okay. And, uh, what’s the second step.”

“That would be up to you. But, were you to ask my advice, I would say start by talking to Noi. It’s very obvious she cares greatly for you, and you feel the same for her.”

“Okay but the last time I had any kinda sexual encounter with Noi I ended up with a dick.”

“I believe that if you are a bit more honest with yourself, you’ll have a much more... favourable outcome.”

“Okay.”

“Now,” Luna said simply. “We’ve got all the time in the world and no limitations. I can be whatever and whoever you want me to be, and you can be whatever and whoever you want yourself to be. So.” She smirked once again. “Why don’t you tell me where you want to start?”

Dinky swallowed heavily, taking Luna’s body in, even as her mind wandered. There was an awful lot on her mind, and an awful lot of things that if she was brutally honest with herself she kind of wanted to try. If Luna was right, and they did have all the time in the world, the only real difficulty would be figuring out where to start.

It was, she realized, going to be a very long night. In more ways than one.

Author's Notes:

Not a lot of sex in this chapter, unfortunately. Also I lied this isn't gonna be the last chapter, as became increasingly clear as I was writing it. I promise y'all that not only will the next chapter have a big ol' sex scene in it, it'll definitely be the last chapter.