Bimbo Invasion

by BubblePuff

Rating: mature
Tags: Alternate Universe, Equestria Girls, Porn, Sex, Fetish, Main 7 (EqG), Profanity
Length: 3455

Twilight creates a potion that turns her and the other Rainbooms into busty bimbos.

In an effort to try and make herself look sexier, Twilight creates a potion that she hopes will give her bigger breasts. However, the potion works too well, and Twilight is transformed into a busty bimbo. She then runs around town turning her friends into bimbos as well. Will Canterlot city become overwhelmed by bimbos?

Published 2022-02-27 23:00:01 UTC
Last updated 2022-05-30 21:54:05 UTC

Chapter 1

Author's Note

This story is inspired by the work of TFSubmissions. Please check out their page at Deviantart.com/TFSubmissions.

Chapter 1

Twilight was hunched over a table in her lab that was covered with various chemicals. She boiled one of the chemicals over a bunsen burner while slowly adding in another chemical from a beaker. Spike walked down the stairs into the lab to see what Twilight was up to.

“Hey Twilight, what are you working on?” Spike asked

Twilight turned to face her talking dog. “I’m working on a formula that should spice up the relationship between Timber Spruce and myself.”

“And how do you plan to do that?”

Twilight smiled a little as she blushed. “Well, I’m developing a formula that should give me bigger breasts.”

Spike gave Twilight a surprised look. “Bigger breasts? But Twilight, you’re perfect the way you are.”

Twilight lowered her head as she sighed. “That is sweet of you to say Spike, but the truth is that I’m not happy with my body. Most of the other girls at school have noticeably bigger breasts, including my friends. And besides, I really want to take my relationship with Timber Spruce to the next level.”

Spike shook his head. “I think this is a bad idea.”

“I’ve already made up my mind, Spike.” Twilight said. Twilight finished mixing together the rest of the chemicals until the formula was ready. “Well, bottoms up.” Twilight picked up the beaker containing a purple colored formula and drank down the whole thing.

“So, how does it taste?” Spike asked.

“It tastes sweet. Almost like honey.” Said Twilight. Suddenly, Twilight felt a surge of energy shoot through her body. She wrapped her arms around her chest as she fell to the floor.

Spike rushed to her side. “Twilight! Are you okay?”

“I…I…” Twilight sat on the floor and leaned back. “I feel so good!” Twilight’s breasts then began to grow until they tore through her shirt and bra. Her breasts were a J cup at the least.

Spike looked wide eyed at Twilight. “I’d say the formula is a success.”

Twilight grabbed her huge breasts and moaned with pleasure as she felt a tingling sensation as she touched them. “Mmm, this is the best feeling ever!” Twilight then felt another surge of energy run through her body. She bent over as a tingling sensation built up in her ass. “AAAAHHHHHHHHH!” Twilight screamed with pleasure as her ass inflated, becoming the size of a beach ball.

Twilight tried to think clearly, but the only thing running through her mind was how sexy her body looked and felt. “Spike, I feel so amazing! I must share this feeling with everyone!” Twilight then dashed up the stairs and out of her house.

“Twilight wait!” Spike shouted as he ran after her.

Applejack and Rarity were both walking down the sidewalk when they spotted Twilight running towards them. They were both in shock at her appearance.

“Twilight, what happened to you?” Rarity asked.

“Yeah, you look very augmented.” Applejack said.

Twilight smiled at the two of them. “I’m having the greatest feeling ever, and I must share it with you!” Twilight then grabbed Rarity and kissed her on the lips.

Rarity felt a surge of energy shoot through her body. She then shoved Twilight away from her. “Twilight! What is wrong with-” Rarity stopped when she suddenly felt a strong tingling sensation in her breasts. Rarity grabbed her breasts as they rapidly began to increase in size.

“Do you feel great like I do?” Twilight asked.

“I…I…” Rarity then began to pant heavily as the energy in her breasts became more than she could handle. “I DO!!!” Rarity shouted as her breasts burst through her top. Her breasts were so massive that she could no longer see her feet.

“Now let me work on that ass, because it is flat!” Twilight then spun Rarity around and slapped her on the ass. Rarity moaned out loud as her ass inflated like a balloon.

“What are y’all doing!?” Applejack said aloud. “Just look at your bodies! You look like bimbos!”

Rarity grabbed Applejack by the arm. “It’s the most amazing feeling ever Applejack!”

Twilight grabbed Applejack’s other arm. “You simply must experience how great it feels!” Twilight and Rarity then both leaned in and kissed Applejack on the cheek.

Applejack’s breasts instantly began to tingle. She wrapped her arms around her chest, trying desperately to fight off the intense feeling that was flowing throughout her body. “I must maintain control!” Applejack thought to herself. “But it feels so good!”

Rarity twirled her finger around the tip of Applejack’s ponytail. “Come now darling, let out those sweet tits of yours.”

Applejack couldn’t hold back any longer. She let the feeling consume her, and her breasts instantly grew to the size of watermelons. “Oh yes!!!” She screamed.

Rarity then went behind Applejack and placed her hands on her ass. “Squish squish!” Rarity squeezed Applejack’s ass, which then began to grow. It grew so big that it tore through her skirt and panties.

“Fuck!” Applejack shouted. “More! I need more!”

“Twilight, this feeling is amazing!” Rarity said.

“I know.” Twilight replied. “That is why we must spread it around to as many people as possible!” Twilight, Applejack, and Rarity then ran off in different directions.

Spike caught up only to see the girls running off. “Oh no, I’m too late!” He said to himself. “I’ve got to find someone who can help and quick!”

Rainbow Dash had just finished up soccer practice and had offered to stay behind to pick up the equipment. She was all alone when suddenly she heard giggling coming from behind her. Rainbow Dash turned around to see Applejack staring at her.

“Whoa Applejack, is that you?” Rainbow Dash asked. “Did you get a boob job without telling anyone?”

Applejack cureased her body, licking her lips as she stared at Rainbow Dash. “Mmm, I’ve just experienced the greatest feeling ever. And now I’m going to share it with you.” Applejack then pounced on Rainbow Dash and pinned her to the ground.

“Applejack, what the hell are you doing?!” Rainbow Dash screamed.

Applejack smiled at Rainbow Dash. “Trust me, you’re going to love this.” Applejack then kissed Rainbow Dash on the lips. Rainbow Dash felt a surge of electricity go through her body. A tingling sensation built up in her chest. Applejack sat up and placed her hands on her hips. “So? How do you feel?”

Rainbow Dash sat up and grabbed her breasts. “I…I…” Rainbow Dash’s breasts then began to swell, quickly bursting through her sports bra and tearing through her shirt. “I feel amazing!”

“You’re about to feel even better.” Applejack then flipped Rainbow Dash over and pulled down her pants. She then squeezed Rainbow Dash’s ass.

Rainbow Dash felt another tingling sensation, this time in her ass. Her ass then inflated rapidly. “Yes, Yes, Yes!” Rainbow Dash screamed with pleasure.

“It sounds like you enjoyed that.” Applejack said.

Rainbow Dash turned to face Applejack. “You bet I did! Come on, we have to share this feeling with everyone!”

“You don’t have to tell me twice.” Applejack and Rainbow Dash then both ran off together.

Fluttershy was working at the animal shelter, sweeping up the floors when she heard the front door open. She looked up and was surprised to see Rarity standing in the doorway.

“Rarity? Is that you?” Fluttershy asked.

Rarity casually walked over to Fluttershy, her massive tits swaying back and forth. “You bet it’s me darling, and I have experienced a feeling that I simply must share with you.”

Fluttershy’s grip on her broom tightened as she became more anxious. “What kind of feeling is that?”

Rarity smiled. “The best kind.” Rarity then placed her hands on Fluttershy’s shoulders and pulled her in for a kiss. Shocked at what just happened, Fluttershy dropped her broom. A strong tingling sensation then surged through her body.

Fluttershy’s breasts soon began to feel tender. She grabbed them as they began to grow, snapping her bra and stretching out her top. “Oh, my.” Fluttershy said in her usual quiet voice.

“So Fluttershy, how do you feel?” Rarity asked.

“I…I…I feel…good.” Fluttershy said as she gently rubbed her breasts.

“Well you’re about to feel even better.” Rarity then went behind Fluttershy and slapped her on the ass. Fluttershy could feel another tingling sensation in her ass. Her ass then expanded rapidly, tearing through her panties.

Fluttershy looked down at her now massive ass. She shook it, and it jiggled like a mound of gelatin. “Mmm, I feel sexy all over.” Fluttershy said as she felt up her body.

Rarity took Fluttershy by the hand. “I’m glad you like it. Now come darling, we must share this feeling with as many people as we can.” Rarity then led Fluttershy out of the animal shelter.

Twilight skipped up to the front door of Pinkie Pie’s house. She rang the doorbell and Pinkie Pie soon answered. “Hiya Twilight! Wow, your breasts and ass are huge!”

Twilight brought her hand to her mouth as she giggled. “Thank you Pinkie. I’ve experienced the greatest feeling, and now I want to share it with you.”

“Oh? And how do you plan to do that?” Pinkie Pie asked.

“Like this.” Twilight then wrapped her arms around Pinkie Pie and kissed her right on the lips. Pinkie Pie could feel an electrical surge shoot throughout her body, eventually building up in her chest. Twilight let go of Pinkie Pie as soon as she could feel Pinkie Pie’s breasts begin to grow.

Pinkie Pie grabbed her breasts as they grew bigger and bigger. “Oh! Ooo, Ooo!” Pinkie Pie moaned. Her breasts eventually grew so big that they burst through her bra and shirt.

“So, do you enjoy the feeling?” Twilight asked.

“I do! In fact, I need more of it!” Pinkie Pie then grabbed Twilight and pulled her in for a kiss. Pinkie Pie felt another electrical surge in her body, this time building up in her ass. Her ass then grew it tore apart her panties and out grew her skirt.

Pinkie Pie released Twilight and squeezed her breasts. “Thank you Twilight! This is the best feeling ever!”

Twilight Smiled. “I’m glad you like it. Now come with me, we have many more people to share this feeling with.”

Sunset Shimmer was driving home from work. She drove by Canterlot High when she noticed Spike wandering by the statue. Sunset pulled over and got out of her car. “Spike, what are you doing out here by yourself? Where is Twilight?”

Spike ran up to Sunset. “Sunset! I need your help! Twilight made a potion that she hoped would give her bigger breasts, but it worked too well! Her breasts became gigantic, and so did her ass! She was then consumed by this feeling of pleasure and ran off. She then ran into Rarity and Applejack, and when she kissed them they grew gigantic breasts and asses too! The three of them then split up and I lost track of them.”

Sunset could not believe what she was hearing. She thought about it for a moment, then decided that it was no weirder than anything else that had happened. After all, she was talking with a dog.

“Alright Spike, where do you think Twilight is right now?” Sunset asked.

“We’re right here Sunset!” Sunset turned around to see Twilight, Rarity, Applejack, Rainbow Dash, Fluttershy, and Pinkie Pie all standing before her. They all had massive breasts and inflated asses.

“Look at yourselves!” Sunset shouted. “You all look like busty bimbos! This isn’t right!”

“But it feels so good!” Rarity said as she felt up her body.

Twilight then approached Sunset. “And soon you will feel good too.” The girls then surrounded Sunset and proceeded to rub against her body with their massive breasts. They also grabbed her ass and rubbed her boobs.

Sunset could feel a strong energy surge through her body. She fell to her knees as a tingling sebastian built up in her breasts and ass. Sunset wrapped her arms around her body, trying desperately to hold back the sensation.

“Becoming hard to think.” Sunset thought to herself. “I must resist, but it feels so good.”

Twilight knelt down by Sunset’s side. “Just give in to the pleasure Sunset. Trust me, you will love it.” Twilight then placed her hands on Sunset’s face and kissed her on the lips.

Sunset could feel her breasts and ass starting to grow. She looked over at Spike. “Spike! You must get to Equestria and warn princess Twilight! She is the only one who can help!”

“But I can’t just leave you!” Spike shouted.

Sunset’s breasts rapidly grew to the size of basketballs and stretched out her top. “Just go!”

Spike ran for the portal to Equestria in the statue. He took one last look at Sunset before jumping through.

Chapter 2

Something has gone wrong. We don't seem to have an archived copy of that chapter.

Chapter 3

Twilight, Timber, Trixie, and Spike ran for blocks before they all stopped to catch their breath. “Trixie refuses to keep running!” Trixie said. “Trixie was not made for such physical exertion.”

“I hate to agree with Trixie, but she is right.” Twilight said. “We will never reach the camp on foot with all of these bimbos running around.”

Timber looked around and spotted a parked car in a driveway. “I’ve got an idea.” Timber went over to the car and opened the hood. After fiddling with the engine, Timber got the car to start.

“Where did you learn that?” Twilight asked.

“I’ve been working on cars ever since I was a kid. It’s something my father taught me.” Timber said. Timber, Twilight, Trixie, and Spike all got into the car. Timber sat in the driver’s seat and drove towards camp Everfree.

Along the way they noticed random bimbos running around. “Man, how did all of this start anyway?” Timber asked.

Spike spoke up. “It all started because Twilight wanted to impress you by trying to make her breasts bigger. The formula that she made worked, but it worked a little too well. Twilight became the first bimbo and started spreading it to other people.”

Timber could not believe what he had just heard. “What?! Twilight started all of this just to impress me? I love her for just the way she is. She didn’t need to change herself.”

“If only you had told her that then none of this would have happened.” Trixie said.

“Now, now. None of this is anyone’s fault.” Twilight said. “Right now we need to focus on distributing this cure.”

As soon as they arrived at camp Everfree Twilight, Timber, Trixie, and Spike all headed for the equipment cabin where the fireworks were stored. Timber unlocked the cabin and let everyone inside. Twilight turned on the light and was surprised by how many different types of fireworks there were.

“Which one of these fireworks would work the best?” Spike asked.

“I would go with this one.” Timber grabbed a massive black rocket. “We call it the big bang. It flies the highest and makes the biggest explosion.”

“That will be perfect for dispensing the cure.” Twilight said.

As Timber grabbed the rocket a giggling noise could be heard. In the doorway stood Gloriosa Daisy, her breasts and ass both massive in size. Gloriosa walked into the cabin, her massive hips swaying from side to side.

“Mmm…I didn’t know that there was another Twilight around.” Gloriosa said. She looked over Twilight and licked her lips. “It looks like you could do with some enhancements.”

Gloriosa was about to lunge at Twilight when Trixie snuck up from behind and bonked Gloriosa on the head with a tree branch, knocking her out.

“Trixie cannot believe that she used to be one of those bimbos.” Trixie said.

Twilight and Timber rolled Gloriosa onto her back. Twilight then dropped a little bit of the formula onto Gloriosa’s forehead. Her breasts and ass then shrank down to normal size.

“Is my sister going to be alright?” Timber asked.

“She should wake up with a headache, but other than that she should be back to normal.” Twilight said.

“Good. Now let’s set up this rocket so that we can distribute the cure.” Timber said. He and Trixie carried the rocket out of the cabin and into the middle of an open field. The rocket was set up and Twilight tied the formula to it using duct tape.

Timber was about to light the fuse when suddenly a loud giggling came from the darkness. Soon they found themselves surrounded by the bimbo Rainbooms.

Twilight was in shock. “How did you know where we were?” She asked.

Sunset stepped forward and smiled. “Our new friend told us.” Sunset then stepped aside to reveal a female and bimbo Flash Sentry.

“Flash, is that you?” Timber asked.

“You bet it is.” Flash replied in a sultry voice. Flash then rubbed her body. “And everything feels so good. You really should experience this feeling.”

“Flash, snap out of it!” Twilight yelled. “This isn’t you! You’re under the control of that bimbo toxin!”

“You’re only saying that because you haven’t experienced this feeling yet, but I can change that.” Flash then pounced on top of Twilight and held her down. Flash then kissed Twilight on the lips.

Twilight shoved Flash off of herself. She felt a surge of energy run through her entire body. Twilight knew that she didn’t have much time until she became a bimbo.

Twilight sat up and wrapped her arms around her chest. She could already feel her body beginning to change. Twilight called out to Timber and Trixie. “Timber! Trixie! You have to launch the rocket! I don’t know how much longer I can hold on!”

Timber and Trixie both ran towards the rocket, but they were stopped by the bimbo Rainbooms. Rarity and Applejack each held onto one of Timber’s arms while Fluttershy and Rainbow Dash grabbed Trixie by the waist.

“It’s time for you to return to the fold.” Rainbow Dash told Trixie. She then kissed Trixie, but Trixie just gave her sly look.

“Ha! Trixie has been given the cure to your bimbo toxin. I’m now completely immune!” Trixie then wiggled her way free from the grasp of Fluttershy and Rainbow Dash and ran towards the fuse of the rocket.

Spike ran up to Trixie and dropped a lighter in her hand. Trixie lit the fuse and the rocket launched. The rocket soared through the air until it entered a large cloud and exploded. The formula then started raining down across the entire city of Canterlot.

As the formula rained down, it touched everyone that had been turned into a bimbo. Within seconds they all turned back to normal, albeit with no memory of what had happened.

Twilight stood up, relieved that she was not going to turn into a bimbo. She then ran to Flash Sentry’s side. Flash had turned back into a man.

“Ugh, where am I? What happened?” Flash asked as he rubbed his head.

“You were turned into a bimbo.” Twilight explained. “Fortunately Trixie was able to launch the rocket and spread the formula.”

Flash looked down at himself and blushed. He quickly covered up his privates. “Can you help me get some clothes?”

Twilight could not help but giggle. “Sure thing. Come with me.”

The next day Timber went over to Twilight’s house. He rang the doorbell and Twilight answered. Upon seeing Timber, she frowned and looked down at her feet. “Oh, hey Timber.”

“Hey Twilight. Mind if I come in?” Timber asked.

“Not at all.” Twilight stepped aside and Timber entered her house. “So what brings you around?”

“Actually, I wanted to talk about what happened. You know, the whole bimbo outbreak thing.”

Twilight’s eyes began to water. She removed her glasses and wiped her face. “I am so sorry for what I did. If you don’t want to be with me anymore I’ll understand.”

Timber placed his hands on Twilight’s shoulders. “I’m not upset with you Twilight. I just want to know why you changed yourself like that.”

Twilight put her glasses back on and looked at Timber. “I was just trying to make myself look more sexy for you. All of the other girls have more sexy figures than myself, so I tried to make myself look just as good as them.”

Timber hugged Twilight. “Twilight, there is no need for you to change your body. I love you just the way you are. In my eyes you’re perfect.”

Twilight smiled and hugged Timber back. “Thank you Timber. You don’t know how much it means to me to hear that from you.”

Timber and Twilight then kissed each other.