Twilight's Sudden Big Tiddy Syndrome

In the castle’s dining area Starlight hums happily setting the table with the plates, silverware and last but not least the food. Using her magic to set plates of pancakes, a bowl of various fruits, beverages and plenty of syrup and butter. She takes her seat now that the table is set waiting for everyone else to arrive.

“Ughhhhhhh,” Twilight groans wandering in looking like an absolute mess, her mane and tail both are frizzy and unkempt, her eyes have bags underneath them.

“Good morning Twilight, sleep well?” Starlight asks before realizing that was a stupid question to ask.

“Does it look like I slept well?” Twilight snaps back giving a glare at Starlight. “I was up all night researching odd illnesses,” Twilight informs Starlight before using her magic to pour her a cup of juice and grab some pancakes and syrup.

“Odd illnesses? I thought you gave up on that?” Starlight questions recalling seeing the book and crumpled up notes she left from yesterday.

“Certain circumstances made me change my mind,” Twilight mentions, deciding that clearly she contracted big tiddy syndrome like in the book. But how? The symptoms are the same yes but how did the first reported mare get it? Is it permanent? What causes it? She has to find out, if anything to prevent it from happening again.

“Morning Starlight,” Spike announces entering the dining room and sitting down before blushing at Twilight. “M-morning Twilight,” he nervously says before reaching for pancakes.

“Morning,” Twilight says giving a small wave before shovelling forkfuls of pancakes down her gob. Starlight looks at the two sensing there is a small amount of tension in the room. She looks back between the two before slowly piecing it together.

“Oh sweet Celestia what did you two do?” Starlight proclaims looking at the two seeing Spike starting to sweat bullets and Twilight seemingly not caring about it.

“Well...uhhh,” Spike stammers out.

“We had sex,” Twilight flatly says before taking a bite out of a banana.

“You did WHAT!?” Starlight shouts.

“T-Twilight!” Spike stammers out embarrassingly.

“What? It’s not like anything has to change, it was the heat of the moment,” Twilight explains causing the room to fall silent.

“Well I guess that’s true… I just hope Rarity wouldn’t be jealous,” Spike points out.

“Spike… you haven’t even asked her out yet,” Twilight mentions.

“I-I’m working on it,” Spike it admits, he hasn’t worked it out how to ask such a beauty like Rarity out. After all she deserves only the best and Spike does want to be the best of the best,

“You will now when the time is right Spike and she will fall head over hoof for you,” Starlight encourages drawing a happy smile out of Spike. The trio proceed to enjoy the rest of breakfast scarfing down plenty.

“Ahhhhhh I’m stuffed!” Spike proclaims patting his stomach with a big grin plastered on his face.

“I will get to cleaning up,” Starlight says, using her magic to grab all the dirty dishes and fly them into the kitchen.

Elsewhere in the castle a loud banging noise is heard at the entrance to the castle.

“I’ll get it,” Twilight said getting up and heading towards it using her magic to grab a brush to fix her mane and tail.

She swings the door open only to see the familiar face of the postmare, Derpy Hooves.

“Package for Princess Twilight Sparkle,” Derpy says reaching into her mailbag and pulling out a clipboard and the package in question. “Sign here please,” the cross-eyed mare asks handing the clipboard while Twilight quickly writes her name down. Twilight hands it back and Derpy hands her the package before placing the clipboard back in her bag. “Have a nice day,” Derpy says before flying off.

Twilight heads back inside holding the package wondering what could it be?

“Whatcha got there?” Spike asks as he walks by curious to see who was at the door.

“Just some mail, seems I got a package,” Twilight notes.

“Oh from who?” Spike asks, curiously Twilight looks down at the package label before seeing a seal and her face turning red once she sees the name ‘Flanksworth’ on the side of the package along with the sender's name being Titty Tina and Velvet Rumpcake. “So who’s it from?” Spike pipes up curious to know who sent Twilight the package.

“O-oh you know nopony special I think this is one of Pinkie’s gag packages, you know,” she tries to play off while internally screaming for her dear life.

“Ah those are always fun be careful with it, I don't want to clean up the confetti this time,” Spike says before wandering off. Twilight breathes a sigh of relief as she makes her way to her room to open the package.

Upon reaching her room she slams the door shut. She moves to her bed sitting on the edge before opening the package, revealing a giant purple dildo, a folded up note, what seems to be an instruction manual, a harness like item and several vials containing a white liquid. Twilight feels herself turn fully red as she picks up the giant horsecock dildo complete with it’s own set of balls too, she blushes further flicking the blunt headed tip seeing it lean before flopping around slightly. She gulps grabbing the note and unfolding it before reading it.

‘Dear Twilight, We know that Scorch gave you that coupon as a reward, but we wanted to pay you back personally. So we went down and bought the best quality dildo, it’s a whopping nineteen inches and three inches thick! And it even has this cool feature of actually cumming like a real cock but the fake cum is like super expensive, so we asked one of the studs here at Flanksworth if he could donate some of his seed and he happily obliged so you can have some fun with it. It also comes with a harness to attach it to that turns it into a strap on if you have any marefriends who are into kinky stuff like that. We even named it! It’s called Twilly’s Dee, get it? Cause Dee is like the letter d and it’s slang for a dick oh well Tina thought it would be funny just so you know who’s writing the letter. Oh and don’t worry about the quality we made sure to test it for the Princess of Friendship and it’s the bes! We also disinfected it too so don’t worry about it being not clean. Be sure to stop by to visit us just to chat or for some pleasure. Sincerely Tiddy Tina and Velvet Rumpcake. P.S careful with the cum, the stud we got it from apparently has accidentally knocked up a few mares here and his seed is super potent so don’t use too much without proper preparations on hand.’

Twilight sighs putting her head in her hands. While she appreciates the thought she can’t believe they did something like this, she lifts her head up. She reaches into the package before reading the manual.

‘Thank you and congratulations on your purchase of the Mistress’s Bitch Tamer 8000 dildo!’ the first page reads. ‘This is our latest model from Naughty Wyvern productions the Bitch Tamer 8000 comes with various features such as; refillable balls, stimulation levels that result in an auto cumming feature, a pleasure stimulator and strap on to dildo capabilities. So whether you yourself are looking to break in your partner or be tamed yourself. Naughty Wyvern is not responsible for any sexual injuries you may suffer or stuckage in any orifices the product was put in or any impregnations you may experience. Please fap responsibly.’

Twilight blinks a few times not quite sure how to feel about that as she puts the manual back in the package. She then lets out a before going into her drawer and getting her ruined sweater. If anypony will know what to do, maybe it will be Rarity and if not least her sweater will be fixed. She changes out of her outfit for something more casual a simple black shirt that hide her push up bra, some yoga pants and to top it of her limited edition Princess Celestia zip up hoodie, she then closes the package and puts her torn wool sweater along with the package in a bag before heading out.

She makes her way through Ponyville being greeted by all the residents of the town. She smiles happily to them even waving to more than a few who greet her. So far nothing can ruin her day… that is until she feels an odd familiar feeling, her chest begins to rumble slightly.

“No…” she says to herself, trying to as if tell her tits to not pull what she thinks they will do to her again. Especially outside with tons of ponies around every corner, she internally begins to panic but doesn’t feel the second rumble. She doubles her pace trying to get to Rarity’s boutique as quick as possible while still being polite to any passerby wishing her a good day. After cramming a research session she learned a bit more from the mare who first was reported of having it, the main reason she knew when it would happen was the rumbling. It would happen three times before eventually ballooning after the third rumble, she did also note that whenever they expanded she got extremely horny whenever they did expand however specialists chalked it up as ‘horny embarrassment’ or perhaps that she was exhabitionist. At least with this slight knowledge Twilight knows what to look out for but her main concern is the other effect, the mare who first had it was a B cup and had since in her normal condition had gone up to a J cup when not inflated. This bothered her as her breast have maintained their current D cup size this could happen to her as well, she must find a cure or some sort of prevention method aside from hiding and waiting till her tits shrink back down to their regular size.

She soon makes it about halfway to the boutique, thinking she will eventually be able to make it there before the second warning rumble would ever occur. Or so she thought…

“No no no! We can’t put that in the gift basket!” a voice cries out in complaint. It was Bon Bon and Lyra and they seem to be arguing about something, until they turn their attention to Twilight.

“Oh good day Twilight think you can help us out?” Lyra asks her.

“Well what exactly are you two doing?” Twilight asks the duo, she knows she doesn’t have much time but her instinct to help other ponies is currently overriding her worries.

“Were supposed to make a gift basket for Cherilee’s anniversary of becoming a teacher,” Bon Bon explains.

“But we can’t quite decide what to put in it,” Lyra tells her. “I thought we could put like flowers and fruit and stuff,” she continues.

“And I thought we could fill it with supplies she would need for school, you know pencils, erasers, rulers,” Bon Bon explains.

“Well both are good ideas but why not mix the two together,” Twilight suggests before it kicks in. her chest starts rumbling. She immediately starts panicking internally once again, this is her body warning her for the second time she doesn’t have much time before her boobs expand.

“Yeah your right!” Lyra exclaims.

“Can you help us pick the stuff out for the basket? We want it to be perfect,” Bon Bon explains, which causes Twilight to bite her lower lip. On one hoof she does have to get to Rarity’s before the syndrome kicks in but on the other this is her duty to help other ponies.

“I suppose I could,” Twilight decides figuring if she can quickly assist them she can rush over to the boutique and hideout there till they shrink back down, surely Rarity won’t mind.

“Great let’s go!” Lyra cheers as they all go along shopping for items to put in the basket, they quickly fill it up with various supplies along with flowers and fruits as well as some various mane care appliances and face creams.

“Alright that should be plenty, thanks again Twilight,” Bon Bon says before her and Lyra give a wave goodbye. Twilight breathes a sigh of relief now all she has to do is get to Rarity’s before the third rumble in her chest occurs. Unfortunately for her as if on cue the moment she turns around her chest rumbles once more, it was too late and there was nothing she can do. The moment her chest stops rumbling it begins to inflate growing larger and larger just like last time, the fabric in her shirt stretching to the maximum capacity when her tits reach EE cup, her bra unfortunatly gives way snapping off as it can no longer hold her chest pillows up any longer. Her shirt follows suit ripping thankfully the only part not being torn is her hoodie mainly due to the fact she didn’t zip it up it just moves out of the way for her enlarged boobies to take full view unhindered by any form of fabric, they stop growing after hitting a J cup, much larger than last time, being exposed to the breeze of the day causes her nipples to grow stiff due to being freed from their prison. Okay it happened but she is only fifteen minutes away from Rarity’s and surely nopony would be able to spot her now I mean her melons are bigger but that shouldn’t draw attention to her, right?

“Holy Celestia! Look at the big tiddy purple pony! Her tits are so big they’re hanging out!” a male pony shouts. Twilight stands completely still holding her breath.

‘Please be talking about somepony else.’ she thinks to herself. ‘Please sweet Celestia let there be another pony who is purple and him not talking about me please!’ she internally screams.

“Woah those melons are like the size of my head!” another comments.

“Wait, I think that’s Princess Twilight!” one exclaims, and just like that Twilight slowly wishes she could dive into a hole and hide. But strangely enough it feels… good? Why is she enjoying this?

“Sweet Celestia that is Princess Twilight!? When did her boobs get so huge!?” a pony questions. Now slowly being crowded Twilight basically gives up, with an annoyed sigh she slowly makes her way to Rarity’s with her swollen mammaries, a task proven quite difficult due to the extra weight and the crowd of stallions staring in awe. The more they stare with their slackening jaws the more aroused she gets, could she be developing an exhibitionist streak herself? Or has she always been like this.

“If your all gonna stare can somepony get me a drink!?” she complains out loud as a few ponies scurry off to get her a beverage. After a minute or two, one returns with a beverage handing it to her. “Thank you,” she says taking it and taking a large sip through the straw tasting the beverage, it was fruit juice she then looks at the gawkers. Shrugging she nestles the drink in between her tits with the straw facing her as she takes another sip and starts casually walking drawing the attention of everypony as she walks down the street. A few of the onlookers trip as they stop to stare at her naked breasts some even with their marefriends immediately get kicked in the crotch or end up in an argument for staring. This makes her feel even more better for some reason, her snatch freely spilling juices staining her panties.

After some time and a whole cup of fruit juice later she finally arrives at the boutique opening the door which catches Rarity’s attention.

“Welcome to Carousel- Great Mooning Mare in the Moon!” Rarity exclaims, her soft white marshmallow cheeks turning crimson at seeing Twilight and her new found weight enter.

“Sup,” Twilight responds before going to throw her cup out in the trash.

“Twilight? Wh-what happened to you? Your chest is so massive!” Rarity stammers not believing what she is witnessing, she always had a bigger rack then Twilight with her bountiful F cup bosom. But Twilight is sporting makes her feel outclassed boobie wise.

“Long story,” Twilight says. “I got something called ‘Sudden Big Tiddy Syndrome’ it causes my breasts to expand randomly, can’t tell if it’s genetic or something like that,” she begins to explain. “Yesterday my boobs expanded and destroyed my favorite wool sweater and while I was on my way here it happened again destroying my bra and my shirt I thought you could fix my sweater and shirt and maybe tailor me some clothes that can support these puppies,” Twilight finishes explaining purposely leaving out the whole bit with Spike, while Rarity stands there trying to process all this.

“So… is it permanent?” Rarity asks.

“Nope it goes away after awhile,” Twilight responds.

“Well I guess I can do this for you as your friend. Come come,” Rarity tells her as they head into the back.

Once the two get in the back of the boutique, Twilight puts her package down on a nearby table.

“Alright let’s see where did I put that,” Rarity says to herself looking in some drawers before finding what she needs. “Ah ha!” she proclaims before turning to Twilight with some measuring tape. She approaches before wrapping the tape around Twilight trying to get an accurate chest measurement.

“Hehe, hey watch it Rarity that tickles!” Twilight tells her trying her best not to laugh.

“Stay still darling I need these measurements,” Rarity scolds her trying her best to measure Twilight’s overly large bust. Constantly struggling as Twilight’s laughter causes her boobs to jiggle making it harder to get an accurate measurement. She grunts in frustration accidentally groping her time and time again, a mix of lust and jealousy. Why was she feeling this way anyway? She did have one of the biggest busts in the group but now she has to compete with Twilight newfound knockers. She continues to measure her chest but keeps fondling her over and over.

“Um… Rarity?” Twilight awkwardly asks, figuring out she must have finally measured her chest by now. So why did she keep measuring her and squeezing her chest. “Have you got the measurements you need?” she asks her.

“Yes darling I got all the measurements I need,” Rarity casually says still squeezing her melons before flicking her thumb against her nipples.

“Then shouldn’t you stop?” Twilight asks being slightly turned on by this turn of events.

“No,” Rarity flatly states. “You are turned on by this though aren’t you?” Rarity says with a smug grin.

“M-maybe…” Twilight meekly responds. She was getting aroused by all this, and after the other ponies staring at her this is just the icing on the cake.

“I knew it!” Rarity states soon tossing away the measuring tape and openly fondling Twilight’s chest and licking her nipples. “You are loving this aren’t you?” Rarity asks only to reach down between Twilight’s legs using two of her digits to rub against Twilight’s sopping wet panties. “Such a slut! You are soaking wet down here!” Rarity exclaims soon pinching and twisting Twilight’s nipples, causing her to scream in pain and pleasure. Twilight wasn’t sure what has gotten over Rarity but has remembered the rumors she heard about Rarity being a closet dominatrix. Either way nothing Twilight can do but enjoy what’s happening. “Hmm, let's see how much damage these fat cow tits of your did,” Rarity mentions using her magic to bring the bag over pulling out the package and the sweater. “Oh what have we here?” she asks in before opening it and pulling out Twily’s Dee. “Oh my Twilight you saucy minx, a mistress’s bitch tamer 8000? You slutty mare you planned this didn’t you?” she asks her grinning before flicking her tongue across a nipple making Twilight holler in pleasure. “No need to say anything you already answered that question, and I am feeling in a rather randy mood,” Rarity admits in a husky voice before releasing her breasts to go over and put on the harness, leaving Twilight panting wanting more. She easily slips into the harness and makes sure everything is secure, she pulls out the vial of cum provided by the mysterious stud and puts it in the dildo before easily snapping it onto the strap on portion. “Perfect, now before I get to business lube it up why don’t you?” she says before pushing Twilight down to her knees and face to face with the huge purple silicone dong. Rarity grabs Twilight’s horn before slapping Twilight with the dildo. “Go on I haven’t got all day,” Rarity mentions giving another cock slap. Taking the hint Twilight opens her gob and starts taking the first few inches of the fake donger. In the strap on a custom pleasure stimulator that gave shockwaves of pleasure to Rarity’s little button making it feel as if she was actually getting head from Twilight, such advancements in pony pleasure. Rarity soon seeks more and begins to force Twilight to take more by pulling her cock forward moving her to take more then half and unhinge her jaw slightly.

“Glup! Slurrp! Mphf!” Twilight lets out various sounds before hitting the base her chin bumping into the silicone balls, with Rarity guiding her Twilight finds herself stuffing down the plastic purple phallus, opening her throat to welcome it as deep as her throat will allow it.

“Hmm that should suffice,” Rarity notes before pulling out, allowing Twilight to catch her breath with her panting like a dog in heat. “Now that it is properly lubed up under my work station, on all fours ass up,” Rarity commands leaving Twilight to obey as he crawls under the desk and lifts her dainty rear up as high as she can go, practically shoving her own face into her own pillowy breasts. Rarity pulls down Twilight’s yoga pants just enough to expose her soaking wet panties and moving them out of the way revealing the purple pussy the alicorn princess was hiding, she then aligns the strap on with it’s target before cocking her hips back and giving a hardy thrust forward parting Twilight like a curtain.

“Ooooooooooooh!” Twilight cries out in pleasure gushing and tightening around the plastic member. Rarity begins a steady pace slamming home each time causing the titflesh that is beaching Twilight to wobble with each thrust. Before too long Rarity uses her magic to fetch the ruined sweater and to remove the fragments of the ruined shirt from Twilight’s body and gets to work all the while still working her hips not missing a beat. Twilight can only moan loudly while Rarity happily hums getting lost in her work and almost forgetting she is fucking Twilight with a strap on, working diligently to repair one of the garments. The room fills with multiple plap plap sounds, as Rarity still feeling the stimulation but rather not focusing as much on it with her hips working on auto pilot constantly pounding Twilight’s purple pussy, but still working her hands to sow the sweater back together and stitch it up very nicely and making sure it is just as fashionable as it once was.

“C-cumming!” Twilight announces her snatch clamping down desperately trying to milk the fake penis as if it were a real one seeking it’s seed, spraying fem juices all over the floor.

“Magnifique I am done!” Rarity announces finishing fixing the sweater before her own orgasm is reached in celebration triggering the phallus to begin discharging the load provided from the vial deep inside Twilight, painting her cunt white and packing her womb. “Oh my that is quite an aftershock,” Rarity notes finding her balance by leaning against the table while Twilight sighs happily. “Well darling I fixed and reinforced your sweater, so you keep lying back while I fix your shirt and get a whole wardrobe ready,” Rarity says and as if cued Twilight’s tits slowly begin shrinking before Rarity although she can’t see due to Twilight being under a table. “Anyway time for round two,” Rarity says looks like Twilight is gonna be stuck here for awhile, not that she doesn’t mind after all.