The pony infection

by Undynlicia

Rating: teen
Tags: Original Character, Second Person, Spike, Comedy, Adventure, Profanity, Discord, My Little Pony: Friendship is Magic, Alternate Universe, Human, Main 6
Length: 4387

The purchase of a 'cursed' Boxset of the MLP series leads to you and your friends catching a strange infection.

You and a group of seven friends who live together and love the show My Little Pony, Friendship is Magic, have contracted a strange infection after purchasing a so-called 'cursed' box set of the MLP series, however, your transformation seems to be slightly more, chaotic than that of your friends.

If this isn't your kinda story, then you don't have to read it, but please don't insult my ideas, constructive criticism is allowed though.

I was surfing the web and found a series of drawings by an artist called TF-Sential on Twitter, they are about an infection that changes people into characters from MLP, inspired by the recent virus going around that I shall not name. I decided that it would be fun to put my own spin on it, taking away the connection to the real-life virus and making it more magically inclined.

Female reader insert

Aforementioned drawings can be found at: https://twitter.com/TFSential/

Voice claims for original characters;
Frances: Dipper Pines (Gravity Falls)
Raelyn: Cherri Bomb (Hazbin Hotel)
Amy: Millie (Helluva Boss)
Penny: Mabel Pines (Gravity Falls)
Tina: Amity Blight (The Owl House)
Sam: Michelangelo (TMNT 2012)
Regina: Lapis Lazuli (Steven Universe)

Cover pic may change.

Published 2021-09-23 02:10:00 UTC
Last updated 2023-10-05 16:19:28 UTC

A cursed boxset

Author's Note

Quick disclaimer; this chapter was written when I was still relatively new to fanfic writing, so it might be a little amateur-ish, but the majority of the next chapter was written later when I came back to this story, (as of writing this note I’ve only just completed writing said chapter), and is much better quality, so even if this seems a little amateur for your tastes, I request that you at least finish the second chapter before benching this story, I’d very much appreciate it, thankyou!

A cursed boxset

You and your friends were at the nearby ZiNG, a pop culture store you all loved, and you and your non-binary partner Frances were both looking at the MLP figurines;

"Hey, look at this awesome vinyl figurine of Celestia!" You held up the box, "Hasbro actually made show-style 3D figures without them being in the uncanny valley for once" You joked,

"Oh my goodness, that's so amazing, I wonder if they have a Derpy one?" Frances replied softly, yet you could hear the excitement in their voice as they gently moved the boxes aside, finding the one they wanted, and you put it in your shopping bag when someone crept up behind you,

"Boo!" A dark-skinned female grabbed your shoulders, causing both you and Frances to scream,

"Raelyn!" You yelled at your friend, "That wasn't funny!" You added,

"It was, like, objectively funny" She choked out through laughter,

"Please don't do that again" Frances requested, still shaking slightly from the shock, as you hugged them in reassurance,

"What was all tha' noise ah heard o'er here?" A blond looked around the aisles, before sighing and rolling her eyes, "Ah shoulda guessed, Raelyn, ya know Frances scares easily" She told off her girlfriend,

"Sorry Amy" Raelyn blushed slightly,

"Alright, jus' be more mindful next time babe" Amy pecked her on the cheek, causing her blush to deepen.

"Hey guys, check this out!" Another one of your friends rushed down the aisle, pulling your arm as her messy brown pigtails trailed behind her,

"Penny!" You complained, "Slow down!"

"Here we are!" the Brunette skidded to a stop, next to two others, a platinum-blond female and orange-brown haired male, who were holding a large box of DVDs.

"Is that" Raelyn began,

"A box set of the entire My Little Pony series! I didn't even know it had been released yet!" Another voice spoke from behind you, which belonged to a black-haired female,

"I was wondering where you were Tina" The male holding the box replied to his adoptive sister,

"Just reading the latest MLP annual" Tina held up a thick book,

"I wish I could say I was surprised" The platinum blonde next to the male rolled her eyes with a smile on her face,

"Anyway," Penny began, "I was just looking through a box of discount items, and I found this! It's unopened too, so it should be top quality!" She motioned to the box the male was holding,

"Sounds like a plan" Amy replied, "but who's gonna buy it?" She asked as everyone averted their eyes,

"I'll cover it darlings" the platinum-blonde pulled out her purse,

"Oh thank you, Regina, you're a saint" your partner replied.

"Oh pfft, it's nothing" She replied waving her hand nonchalantly, as the eight of you made your way to the counter, placing the boxset on it,

"Yeah, I wouldn't buy that if I was you" The cashier looked at the box-set,

"Hey! Just because we're adults doesn't mean we can't watch whatever we want!" Raelyn exclaimed, slamming a fist on the counter,

"Oh, that's not what I meant" The cashier reassured her quickly, "I'm a fan of the show myself, no this boxset is rumoured to be cursed" She admitted.

"C-cursed?" Frances hid behind you,

"That just makes me want it more!" The male of your group added,

"Sam is right, this could be exciting!" Penny jumped up and down,

"Or extremely dangerous" Tina cut in,

"Oh don't be such a stick in the mud Tina" You flicked her playfully,

"I wonder what the curse might be?" Regina thought aloud,

"Maybe it's haunted" Raelyn wiggled her fingers playfully,

"Or perhaps it'll transport us into the show" Amy added jokingly, nudging her girlfriend,

"There's no talking you out of this is there?" The cashier deadpanned,

"Nope!" Penny replied as Regina pulled out her cash, after which you bought the vinyl figures that you and Frances had collected and the eight of you made you made your way back to your shared house.

"So, who here wants to watch a so-called 'cursed' edition of the My Little Pony series?" Regina asked rhetorically, as you all piled into the living room, dressed in your pyjamas.

"I'm still on the fence about this, but as long as we don't do anything too silly, we should hopefully be able to deal with this, knock on wood" Tina sat down on one of the armchairs,

"I guess we better be prepared for a possible storm of chaos!" You quoted jokingly as you and Frances sunk into a beanbag, Raelyn and Amy sat down on the couch, and Penny laid down on the rug in front of the TV as Regina inserted the first disk into the player, before snuggling next to Sam, who was leaning against the foot of the couch. The TV turned on in response to the disk being inserted and seemed to be displaying a normal menu screen, and Regina pressed play on the first episode, which appeared to start normally, displaying the prophecy of Nightmare moon.

"Is it just me, or is nothing happening?" Raelyn blurted after a few seconds,

"it's only jus' begun, hold ya horses" Amy shushed her,

"hehe, horses" Penny giggled before going silent again as the introduction continued;

"Elements of Harmony. I know I've heard of those before... but where?" the TV cut to black, but instead of the theme song or next scene playing, the centre of the screen seemed to elicit a glow,

"Somethings actually happening!" Sam exclaimed as the orb of light came out from the screen, and wavered for a second, before splitting into eight different colours; one in each colour of the rainbow, and one in brown, each made a beeline for a different person in the room, seemingly disappearing into their chests, the red went to Realyn, the orange to Amy, yellow to Frances, green to Sam, blue to Regina, indigo to Tina, violet to Penny and brown to you.

"umm, what was that?" Frances asked,

"Ah’m not quite sure" Amy replied, instinctively holding her hand to where the light entered her,

"Why did I get the brown one?" You asked nobody in particular, "it had better not make me evil, I swear" You huffed,

"Do you think it's safe to keep watching?" Regina asked,

"If it gives us answers to whatever the heck that was, then yes" Realyn replied, crossing her arms over her chest, as the next scene played. The group of you watched suspiciously at first, but relaxed when nothing else happened. When the next episode began, you collectively held your breath as the recap finished, but it just went to the theme song like normal,

"Do you think that, whatever happened, was a one-off?" Tina asked during the theme,

"Sure seems that way, but I wanna see how Twilight defeats Nightmare moon!" Penny smiled

"Haven't you watched this enough times to know what happens by now?" Sam raised an eyebrow,

"No such thing!" Penny replied as the theme song ended. For several hours the eight of you watched the series, and eventually, everyone had all but fallen asleep, You and Frances were curled together, Amy lay half-on Realyn on the couch as the pair snored softly, Tina's head had lolled to the side, Regina and Sam leant against each other, and Penny was struggling to hold her head up. "Do you, *yawn* think we should turn the TV off now?" Penny drawled as those of you who were still somewhat awake murmured in agreement, and Penny did so, before laying down on the rug, falling asleep the moment her head touched the floor. None of you noticed the minor changes affecting you overnight, such as some of you gaining protrusions on your back, waist, or forehead.

It was mid-morning when you were all woken by a scream, and turned to the perpetrator,

"What is it Raelyn?" You asked the African-American who was sitting bolt upright,

"This" she held out her hands, and you saw that some of her fingers seemed to be merged together, and the tips seemed to be covered in light blue fur,

"Holy mother of god" Regina looked at the strange change,

"Regina, your hair, it's turning purple" Tina pointed out, and Regina grabbed said hair and saw that indeed it was,

"You two ain't the only ones who 'ave changed" Amy added, pulling the blanket off of her legs, revealing her toes to have joined together too, and the tips of them were covered in orange fur.

"I think something happened to me too" Penny turned and the rest of you saw a short hot-pink tail-like protrusion poking out between her pants and top,

"It kinda looks like the beginning of a tail" Sam remarked,

"Oh really, I didn't notice," You said sarcastically, before holding your forehead, "Is anyone else's head feeling odd?" You added,

"Mine kinda is" Tina admitted,

"Not my head, but my back feels strange," Frances remarked, as Tina put a hand to her forehead and then withdrew it with a gasp, before opening the camera app on her phone, and using it as a mirror, seeing a purple protrusion in the middle of her forehead, and the pieces clicked into position in her mind;

"I think I know what's going on" she stated "If you consider what likely caused this, and what the transformations are, it seems to make sense" She explained, as the rest of you figured it out.

"Oh. My. God!" Raelyn exclaimed, "I'm becoming Rainbow Dash! So cool!" She pumped her fist.

"Ah guess that means I'm goin' ta be Applejack then" Amy added,

"The characters we are becoming seem to fit with our personalities" Regina observed as you felt your head and found not one, but two small protrusions,

"Two horns? That's strange" You thought aloud as a shout of excitement cut through your thoughts;

"Sam, look at your ears!" Penny pointed to the ears which were slightly showing through Sam's messy bed hair, before holding up her phone for him to see what she was referring to; his ears had become slightly frilled and were a translucent green. After a second realisation hit him;

"I'm becoming Spike. God Dammit!" He stomped his foot in irritation at becoming the baby dragon who was always pushed around in the series,

"I guess that means I can call you Spikey-Wikey then?" Regina asked with a sultry smile,

"I'd prefer if you just used my real name if that's okay" Sam blushed,

"Alright" Regina hugged him as Frances walked up to you,

"Do you know who you're turning into yet Y/N?" they asked,

"No, but I think I have two horns, you're becoming Fluttershy, right?" You asked your partner, who nodded, "How do you feel about that, I mean, you may identify as non-binary, but you're biologically male though, so..."

"I'm more or less okay with it, do you mind if I check your horns, it may help you," They suggested,

"Yes thanks," You replied, as Frances carefully parted your hair,

"Hmm, one of your horns is a light blue, and the other is a cream white" they responded,
"Blue and cream whi- oh, ooohhh shit" You realised who you got "I'm becoming freaking Discord"

The First Changes

Author's Note

I wouldn’t be surprised if you could figure out exactly when I came back to working on this story after benching it for over 2 years

Also quick trigger warning, this chapter touches on the private parts of some characters having changed, it’s only mentioned in a purely un-sexual way, but it wasn’t something that I could just leave out, since it’s a pretty important change to cover.

The First Changes

"One of your horns is a light blue, and the other is a cream white" Frances responded,

"Blue and cream whi- oh, ooohhh shit" You realised who you got; "I'm becoming freaking Discord!" You stated before a grin spread across your face as you processed the info,"Awesome!" You pumped your fist.

"No fair! Why couldn't I get the god of chaos, instead of the runt of the litter?!" Sam exclaimed in disdain,

"Because you're not a chaotic gremlin like me" You joked, sticking your tongue out,

"Not to mention you're the youngest out of the eight of us" Penny added, playing with her new tail,

"I'm 20! And it's not like you can talk, you're only 2 years older than me!" Sam shot back,

"Still makes you the youngest~" Penny sing-songed,

"She has a point Sam" Tina mentioned offhandedly, "Now would you please all be a little quieter so I can note down all of this!?" She became more exuberant as she tapped away at her phone, setting up a document detailing the strange occurrence you were dealing with.

"That's our Tina, always lookin' at the science instead'a tha excitemen'" Amy shook her head as she laughed, struggling to balance on her new hooves,

"Totally!" Raelyn added with a snort, "Lighten up T, we're becoming the main characters from our favourite series!" She shook Tina's shoulders, who pushed her away by the face,

"Exactly, the amount of genetic modifications that must be happening to our bodies is unheard of, and to think that it's happening without any pain or discomfort is fascinating! I have got to get some DNA samples to study the biological changes. If I cross-reference them with the ones I got a few weeks ago, I can study the differences between them, and-"

"Tina darling, you're ranting again" Regina notified her,

"Well why wouldn't I be, this could be the scientific study of the century! If I find out how it works, I can replicate the-" Tina continued rambling as the rest of you turned away from her.

"Once she starts, she can't stop till she's done, can she?" You spoke up,

"I knew we shouldn' 'ave got 'er that DNA kit for 'er birthday" Amy facepalmed, using her other hand to steady herself against the couch.

"At least it's coming in handy!" Penny reasoned, "I'm going to make breakfast, pancakes for everyone!" She skipped over to the kitchen,

"Way to change the subject!" Raelyn yelled as Penny poked her head back inside the door,

"I know right?" She smiled, pretending to think Raelyn was serious, before drawing her head back in.

"I hate it when she does that" Raelyn grumbled crossing her arms as the sounds of pots clanging rang out from the kitchen.

"-And that is why this is so amazing." Tina finished, not noticing that she had been tuned out ages ago, "Where's Penny?" She looked up,

"Making pancakes" Sam jabbed a thumb at the door,

"Oh, well anyway, for the testing I need DNA from each of you, to see how much it's changed" She mentioned as each of you gave your own signs of protest and grabbed a strand of hair from your head. "Thanks! I'll run these through the extractor as soon as I get one from Penny" Tina thought aloud as you each gave her the strands of hair, before rushing through the doorway to the kitchen.

"So... what do we do while we wait?" Frances asked the five of you still in the room,

"I say we get changed, even with all of this, it’s hardly proper to wear pajamas all day." Regina replied, and you all went to your rooms to do the same.

"Well, I'm honestly surprised by how well everyone is taking, this" You gestured to your horns, which by now had grown long enough to be seen through your hair, as you and Frances walked to your shared room,

"I know, but I suppose it hasn’t quite sunk in yet, and we are all bronies and pegasisters, this is practically a dream come true for us" They replied, walking through the door.

"When you put it that way, I guess it is!" You laughed, but stopped upon seeing your reflection in the window, the way it appeared semi-transparent in the glass reminding you of one of the episodes in season 7, "Oh no."

"What is it Y/- what are you doing?" Frances asked in curiosity, as you pushed your wardrobe into the corner and then placed your desk next to it,

"Stairs to nowhere" You deadpanned, placing a footstool on the desk and a chair against it,

"But... why?" Frances responded,

"Discord can't live without chaos, and I'm becoming him, so, ergo, I can't live without chaos" You reasoned, nodding as you looked at your handiwork,

"Of course, when he tries to act 'normal' in 'Discordant Harmony' he begins to fade!" They realised with a start, dropping the clothes they were holding,

"Exactamundo! Once I put a rug or something on this, it should be good for now" You looked under your bed and found an old fleece blanket, and draped it over your makeshift-stairs,

“Are you sure? What if it isn’t enough?” Frances worried, their pupils shrinking in fear,

“There isn’t much we can do that lives up to Discords’ level of chaos without magic, but if I look like I’m fading even a little, I’ll just throw caution to the the wind and do something crazy I guess, like… moving all the furniture in the house a few centimetres to the left? That should cause enough chaos for me, right?” You suggested, rubbing the back of your neck in thought, “It’s a bit cruel though, stubbed toes are no joke… although, if these changes keep up, I suppose it won’t be long before none of us have to worry about that, Amy’s already got proto-hooves, and the claws that Sam and, one of my feet, will eventually get should be pretty strong…” You trailed off, when you first realised who you were becoming, the idea of being a chaos god sounded like a sweet deal, but now that you were thinking about the physical side of things, you were a bit more apprehensive, and you sat down on the bed as you gathered your thoughts, bringing a hand to your mouth to feel your teeth, no snaggletooth yet, but that didn't mean you wouldn't have one soon, “I think it just sunk in who… what I’m becoming” you realised, staring down at your human hands, how long would it be before you had a paw and talons in their place? You were brought back to the moment by a hand on your shoulder, and turned to see your partner beside you;

“At least you’ll still have fingers, and be able to walk upright” They smiled at you, but you just groaned and covered your face with your hands as you leaned back on the bed,

“Sorry I’m being selfish, you have it way worse,” You apologised, and another thought formed in your already-bustling mind; “What if this stuff is messing with my brain, I mean yeah, I was already a pretty chaotic girl, but Discord, he was once a villain, and he still acts as an antihero sometimes, even if he’s not trying to, heck even if this isn’t affecting my mind, if we get our characters abilities, what if I get overconfident and do something bad, they say power corrupts, and the phrase wouldn’t have persisted for so long if there wasn’t some truth to it” you explained, feeling hot tears welling up in your eyes,

“Y/N you’re overthinking this, I know you and I know that you won’t become a bad person, even if there are some mental effects, and you aren’t being selfish, you’re becoming something completely different, it’s okay to be worried, I know I am, but it’s not all bad” Frances comforted you, and you opened your eyes, sighing as the words sank in, and rubbing the tears from your eyes;

“Yeah, I guess you’re right, I suppose I was just thinking about all this and spiralled, and even if my body is changing, at least I should get some cool powers from the deal, right? And I suppose I could use those powers to change my appearance to one less, absurd” You let out a small laugh at the thought, “I’d probably only really change the facial area though, and maybe down under if you catch my drift” You chuckled, “I know one thing for sure, no matter what happens, I’m still identifying as female”

“That’s the Y/N I know, it’s nice to have you back” Your partner smiled softly, giving you a kiss on the cheek, before realising something; “We should probably get changed, Regina will kill us if we stay in our PJ’s all day” they added, and you nodded in agreement, getting up and stretching, before going to get your clothes for the day, as Frances picked theirs from where they’d been dropped on the floor and placed them on the bed, and just before you turned back around to place yours on the mattress they spoke; “Oh my, speaking of changing down under…” they gasped and you whirled around to look at them, only now instead of a they, Frances was a she,

“Holy-“ You began, before noticing something else had changed about your ~~partners~~ girlfriends abdomen; three pink butterfly’s were emblazoned on her thighs, “Cutiemark” You instantly spoke as soon as you registered what the symbol was, and she turned her gaze to the symbol, gasping once more, her eyes darting between the two changes, and it was then that you registered that if Frances equipment had changed to that of her characters… well the next second your pants were down as you inspected your nethers, you no longer had a clit, but you didn’t have a dick either, it was just a blank expanse of brown hair, no scratch that, brown fur, you felt the area in case the fur was hiding something, but felt nothing more than short, slightly coarse, hairs, and one thought came to your mind; “How am I supposed to go to the bathroom now?” As soon as you spoke you heard soft laughter and turned to see Frances covering her mouth,

“That’s the first thing that comes to your mind?” She requested, and you couldn't help but blush;

“Sorry, sorry, but seriously, how am I supposed to go to the toilet? I don’t have anywhere for it to come out!” You answered through your own embarrassed chuckles, gesturing to the fur replacing your genitals,

“Well, you are becoming Discord, it could be related to your chaos powers? Perhaps it just appears when it’s needed or something?” Frances suggested, getting into her clothes, and you paused to think;

“I suppose so, but I don’t think I have those powers quite yet, I think I’d feel them if I did, although I suppose it wouldn’t hurt to try?” You reasoned, and snapped your fingers, before looking around the room, but nothing seemed to happen, “I suppose that’s a no for now” You sighed, you were kinda hoping you had the powers now, but alas, no dice.

A few minutes later you were dressed and had just stood in front of the mirror to brush your hair, pausing in wonder as you saw the mismatched horns on your head, they weren’t fully grown in yet, but they were definitely bigger than when you woke up, and after you shook yourself from your surprise and had began to brush your hair as best as you could with the obstructions, you noticed something out the corner of your view and glanced at the rest of your face, specifically your eyes, your red eyes.

“Uh, Frances?” You began, “Why didn’t you tell me my eyes had changed?” You asked your girlfriend, staring at the reflection of your eyes, currently you still had visible pupils, even if they were clearly scarlet, and your irises were almost the same size, although your left was a touch smaller than the right, what was once the white of your eyes was slightly yellowed too, not to the extent of Discords quite yet, but you could tell that in a few hours, heck maybe even just one, your eyes would be practically identical to the draconequus,

“They have?” Frances asked from behind you, “Have mine?” She added curiously, and you turned to look;

“Well, they’re definitely Fluttershy’s colour, and your iris and pupil are a little larger, but I’d say they still have a little ways to go, like mine, and your eye shape is still the same too” you examined, “the colour looks pretty good on you actually” You added, smiling, a teasing lilt to your words, but no bite behind them,

“As do yours, Discord” She teased back, and you chuckled,

“I think I’m still going to have to change a little more before I start going by that name, unless you want me to start calling you Fluttershy” You responded, grinning,

“I, actually wouldn’t mind that” Frances blushed, looking away as she rubbed her arm, an embarrassed smile on her lips, and you raised your eyebrows at the remark,

“Well, if you want me too I’m sure it wouldn’t be that hard, might be, chaotic, even” You laughed, sending her a smirk,

“You’re doing that on purpose aren't you?” She replied, as the pair of you began to make your way to the kitchen for breakfast,

“Oh, you wound me so my fair Fluttershy, have you such little faith in me?” You gave your best Discord impression, an arm shielding your forehead in mock pain as you leaned against the wall dramatically,

“Pfft, stop that” She giggled, and you pushed yourself back into a standing position,

“Alright, alright, just getting into character” You chuckled, “Honestly though, you’re actually okay with going by Fluttershy now?” You added, raising an eyebrow in curiosity,

“Yes,” ~~Frances~~ Fluttershy smiled, “I think I am.”