Sunset Shimmer crawled into bed. Once snugly inside her covers, she rested peacefully. Today, she had given Fluttershy a firsthand look into a new kind of magic Sunset had discovered – the magic of bimbofication. With Fluttershy now having a bimbo alter ego which could be activated on command, Twilight's friends would be too busy trying to fix her to compete with Sunset for the Princess of the Fall Formal, leaving Sunset free to claim the crown for the fourth year in a row.

Sunset Shimmer could imagine it now. Twilight's friends, overwhelmed by sight of Big Boobs' jiggly breasts. Either giving in to temptation to squeeze their friend's breasts, or trying to cure Fluttershy and being frustrated with their inability to figure out a cure.

Sunset smiled in her sleep. Watching sweet, timid Fluttershy turn into an attractive, busty, and eager-to-please bimbo had a deep sort of satisfaction to it. Maybe she would do it to the rest of Twilight's friends. Maybe she would do it to Twilight. The thought of the five them being subjected to physical 'improvements' ... giving into their bodies. Giving into their new found lust ...

"Heh heh," the thought made her giggle. Sunset rolled over onto her side to sleep.

Then her eyes shot wide open as she realized something.

She had given Fluttershy an enchanted brassiere which suppressed her breasts - and her bimbo alter ego.

And she had only given Fluttershy one.

One brassiere. One set of undergarments Fluttershy was relegated to wearing all the time, unless she decided she wanted to be a bimbo 24/7.

Sunset Shimmer dreaded to contemplate how much dirt and filth would eventually accumulate over that perpetually-worn undergarment, covered in dirt and crusting over with mold, becoming stiff ... the thought made her skin crawl.

Sunset Shimmer pushed out her covers and got up from her bed. She went to her dresser and looked through it, hoping to find more brassieres with a color that complimented Fluttershy's skin tone which Sunset could enchant before giving them to Fluttershy. This way, Fluttershy would at least the ability to change undergarments and do laundry.

Sunset Shimmer liked to think of herself as many things, and others liked to think the same way. A liar? Eh, she preferred "deceiver." Sounds more fancy that way.

Cheater? Perhaps, but she preferred "pragmatist."

And with the sexual nature of what she did to Fluttershy, one could argue she was also a pervert as well.

But she did not like to think of herself as a monster! Only one bra for poor Fluttershy! What was she thinking?

Tomorrow, Sunset Shimmer would go over and present Fluttershy with some extra brassieres.

Resolved to amending her tiny slip-up, Sunset returned to her covers. As she drifted to sleep, she continued to toy with the idea of bimbofying Twilight's friends.

Tomorrow ... was not going to turn out like she expected it to. Sunset slept, unaware of the true scale of what the events of tomorrow would set into motion.

The next morning, Fluttershy got up and reasoned today was a good day to take a shower. She didn't want to smell awful to her classmates, especially when she was trying to hand out fliers to a crowd for her animal shelter.

Fluttershy went into the bathroom and locked the door so no one could accidentally walk in on her and see her changing for the shower.

Fluttershy pulled up the curtain before resting her leg on the edge of the tub so she could pull the socks off. She pulled the shirt of her pajamas over her head, folded it up neatly, and placed on the floor for later.

Then, she reached over her shoulders at the back of her brassiere and undid the latch. It came apart with a loud “click.”

Fluttershy began to feel light-headed. She placed a hand to the side of her head.

“Oh… what's… going on?” Fluttershy mumbled, before watching as the brassiere grew in size – and her breasts grew with it.

“Oh… oooh,” Fluttershy moaned, feeling so good as her chest increased in size. She lifted one hand up her breast and gave it a slight bounce.

“Oooh… oooh,” Fluttershy sank to the floor as Big Boobs, the alter ego Sunset implanted in her earlier, became dominant.

“Oooh… hahaha!” Big Boobs giggled, watching the assets she was named after grow and unfold before her. She ran her hands over her breasts, giggling the whole time.

“Haha… oh, it's too bad I don't have anyone here to squeeze them with me.” Big Boobs lamented, continuing to play with her breasts.

Elsewhere in town, Twilight Sparkle was meeting up with her friends before they went to class.

“Hey girls!” Twilight greeted them as warmly as she would her friends in her home dimension. “Ready to for another big day? We've got a lot work to do if we want to beat Sunset Shimmer.”

“You know it!” Rainbow Dash pounded her fists together. “I can't wait to see the look on Sunset's face when she loses that crown for the first time.”

“Yes,” Rarity looked to the side, trying not to show resentment. “Hmm. I wonder where Fluttershy is. She should be here by now.”

“Ah, probably saw someone crossing the street and decided to hide in a bush rather than risk social contact,” Rainbow Dash joked.

“Rainbow!” Rarity exclaimed.

“Sorry,” Dash said. “But you got to admit, she is really shy.”

“That's Fluttershy for you,” Twilight said, earning odd looks. She had to remind herself these weren't the same ponies she was friends with for years now.

When Rarity's phone begin to ring, she answered. “Hello?” Rarity handed the phone to Twilight. “It's Fluttershy. She says she wants to talk to you.”

“Okay.” Twilight pressed the phone to her ear. “Hello?”

“Twilight?” Fluttershy's quiet voice peeped through. “Are you there?”

“Yes, I'm here.”

“I could really use your help with something.” Fluttershy said. “I'm … having trouble with the shower. Oh, wait, you do have showers in Equestria, don't you?”

“Of course,” Twilight said. “I mean, we're not animals.” Twilight rubbed her chin. “Well, I suppose we might be to you … anyways.”

“Do you think you could come over and help? I just can't figure it out myself,” Fluttershy said.

“The girls and I will be right there.” Twilight said with a smile.

“Oh, um, actually… I think it would be better if you came alone. I'll explain when you get there. Bye.” Fluttershy closed the call.

“Bye.” Twilight handed Rarity back her phone. “She wants me to come over … alone, for some reason.”

“That's odd.” Rarity said. “I don't know about you, but I thought we were making pretty good progress on friends. I hope Sunset Shimmer hasn't coerced her into being compliant with some scheme ...”

“I'll find out when I get there,” Twilight said. “I'll let you know what's going as soon as I'm done helping Fluttershy.”

“Good luck!” Rarity waved her off.

Twilight ran down the sidewalk to Fluttershy's house.

Meanwhile, Sunset Shimmer was walking up to Fluttershy's house with a bunch of dark-green brassieres hanging off her arms.

“Fluttershy!” Sunset Shimmer knocked on the door. “Are you home? I've come to fix a, heh, little mistake I made ...”

Sunset Shimmer whipped her neck around when she saw Twilight Sparkle walking up the sidewalk. Deciding it would be best not to risk a confrontation, Sunset fled.

Twilight arrived at Fluttershy's door, displaying confusion on her face when she saw only a brief silhouette of a fleeing figure. She was about to knock on the door when the door opened for her.

“Twilight!” Fluttershy exclaimed with your relief. “I heard you calling my name. I'm so glad you're here.”

“I didn't … call your name,” Twilight said.

“Huh. Then who did?” Fluttershy and Twilight decided not to ponder that now. “Won't you please come in?”

“So, what made you decide you only wanted my help?” Twilight asked as Fluttershy led Twilight to the bathroom.

“Oh, uh...” Fluttershy pushed open the door. “This is going to involve something which would make most humans a little uncomfortable, and I figured...”

“Since I'm not human, it won't bother me as much,” Twilight said. “I understand. So, what seems to be the problem?”

“That's just it,” Fluttershy said. “I'm not sure. I try to get in, but every time I do, I wind up on the floor for some reason.”

“Huh. That's strange,” Twilight said. “Show me.”

Fluttershy walked up to the edge of the tub. As with this morning, she pulled her socks before pulling up her shirt. Twilight looked aside and bit her lip; even though she wasn't human (most of the time) she could tell this wasn't something most humans shared with other humans.

Fluttershy proceeded to undo the clasp of her brassiere.

Twilight's eyes widened, as this was when things began to get interesting.

Fluttershy lost her balance and stumbled, her body swaying back and forth as her normally unremarkable breasts begin to swell like inflating beach balls. Her eyes seemed to lose focus as she was overcome with pleasure, and she began giggling.

Fluttershy noticed Twilight.

“Hi!” She said as if this was the first they'd met.

“Uh … hi?” Twilight awkwardly answered her, waving her fingers.

“My, you're cute.” Fluttershy(?) said, striding towards Twilight. “I'm Big Boobs.” She extended a hand towards Twilight.

“Big… Boobs? Uh… I'm Twilight Sparkle.” Twilight question, taking the hand. This proved to be a mistake, as Big Boobs grabbed Twilight and pulled her close. Big Boobs pressed down on Twilight's shoulders and pushed her to the floor, where her hanging breasts were inches above Twilight's face.

“Now, Twilight...” Big Boobs flicked a hand through her hair before pressing her chest down onto Twilight's chest, pinning Twilight to the floor. “How can me and my big boobs please you today?”

“Uuuuuh...” Twilight stared open-mouthed. She wasn't familiar with several human behaviors yet, but she was quite certain this was not normal. Twilight squinted as she noticed the clasp of Fluttershy's brassiere hanging off her back. It wouldn't take more than an inch for it to fall over completely.

“It's okay.” Big Boobs said. “I'll do… anything… you… want.” She purred in a sultry voice, brushing a finger along Twilight's shoulder.

“Uh, that's very generous of you, Fluttershy...” Twilight said.

“Why does everyone make that mistake?” Big Boobs questioned. “My name is Big Boobs.”

“O… kay.” Twilight said. “Very generous of you to, Big Boobs, but I think I'll pass.”

“Oh, please, won't you?” Big Boobs begged. “I've been waiting all morning for someone to play with my breasts.”

“Uh, all right.” Twilight made an observation. This, er, “Big Boobs” character hadn't appeared until after Fluttershy undid her brassiere, so maybe if Twilight redid… but would Flutter-er, Big Boobs notice, and would she object?

Not if I distract her. Twilight realized, looking at Big Boobs' big boobs. Twilight began wanting to play with them. To touch them, grab them, hug them …

They must be hypnotic, surely, Twilight thought. That's the logical only explanation I can think of. Or maybe my body is just more attracted to them I realize?

“Would it be all right if I… touched them?” Twilight asked nervously.

“Oh, yes!” Big Boobs said, leaning into her. “Please do!”

Twilight reached one hand to grab and squeeze Big Boobs' breast. While Big Boobs moaned, Twilight reached her other hand up to the clasp sliding around on Big Boobs' back.

“Yes, that's it,” Big Boobs moaned, eyes shut. “Squeeze them ...”

Yes. I… I WANT to squeeze them. Twilight thought. No. What am I thinking? I have to stay focused.

Trying to keep Big Boobs distracted by massaging her breast, Twilight reached and fiddled with the clasp, trying to snap back together. Which was a little difficult with only one hand.

Distracting Big Boobs' was more challenging than she realized. Every so often, Big Boobs would twitch slightly, noticing something on her back, but Twilight would recapture her attention by giving her an extra-firm squeeze.

Twilight managed to complete her task, eventually getting all the pieces lined up and clicked together. She watched as Big Boobs closed her eyes and her big boobs began to shrink down.

“Oh… uh.” Fluttershy put a hand on her forehead before opening her eyes to see Twilight. “Oh! Twilight! Were you able to figure what was going on?”

Fluttershy noticed she was lying on top of Twilight while topless. She blushed and speedily removed herself.

“Yes.” Twilight pushed herself up. “Yes, I think I have.”

The girls gathered around the statue outside the school. Students were moving into the school, and classes would be starting soon, but they needed to sort out this mess first.

Sunset Shimmer was one of the students attending. She was half-way up the stairs when she noticed Twilight's friends meeting around the statue.

“Hmm.” Sunset rested her arms on the guardrail, listening in on their conversation.

“Okay, so, let me get this straight.” Rainbow Dash said. “Fluttershy took off her… you know, and the next you know, she's trying to smother you with her breasts?”

“I know it sounds crazy, but that's exactly what happened,” Twilight said. “She was really… insistent that I 'play' with them.”

“I never thought Fluttershy would have such a wild side to her.” Rainbow Dash joked, much to Fluttershy's discomfort.

“I don't! Really! I don't even remember what happened!”

“You know what?” Rarity said. “I'll bet Sunset Shimmer is behind this. We should take Fluttershy to Principal Celestia as proof of Sunset's crimes. Maybe we'll get her expelled.” Rarity had an oddly vicious grin on her face.

“Yeah, sure.” Rainbow Dash paused as a student walked by them. So far, they were lucky enough to avoid anyone overhearing anything, and they wanted to keep it that way. “Let's shove Fluttershy's cleavage in Celestia's face and tell her Sunset Shimmer gave her non-consensual implants. I'd believe it if someone was telling me something like that!”

“Fair point,” Rarity said. “Still,we must do something ...”

“Hmm…” Twilight rubbed her chin. “Spike, do you think Princess Celestia would mind if I had you deliver a letter through the portal and then come right back? Hopefully she'll know what to do.”

“I think she'll understand,” Spike said. “As long as it's quick.”

“Got it. Does anypony – sorry, anyone have a pen and paper I could borrow?” Twilight found herself being presented with a pen from Rarity and paper from Rainbow Dash. “Excellent.” Twilight took the instruments, wrote out what happened to Fluttershy (though she crossed out Fluttershy and replaced it with just “friend”) and furled it up before handing it to Spike. Spike took it into his mouth and jumped through the portal.

It didn't take long for him to hop back out, dropping a letter, a piece of metal on a chain, and a bag of tea leaves with him. Obviously, when returning from the other side, he forgot account for his dragon claws disappearing when he went back through.

“Thanks, Spike.” Twilight picked up the letter up and read it out. “Dear Twilight Sparkle, it sounds as though your friend has been the victim of a rare type of magic I thought extinct: it's called “bimbofication” and focuses on physically and mentally altering the victim, usually with an emphasis on… sexual components. With Spike, I've sent something that should cure her. The leaves, when boiled, will make a special tea that should fix – or at least reduce – her physical changes, while the amulet is made of an enchanted silver. Set her down somewhere quiet and use it to hypnotize her, and you should be able to purge her mind of inappropriate thoughts.”

“WHAT?” Sunset Shimmer, overhearing all of this even with the chattering students around her, put her hands on her head in shock. She slammed her fists on the guardrail. “It can't be that easy!”

Two female students walked up the stairs, passing Sunset. They noticed her. They exchanged glances, wanting to be nice to their fellow students, but also knowing of Sunset's easily-provoked wrath.

“Uh, Sunset?” One of them asked. “Are you coming inside?”

“Yes.” Sunset waved them off, fuming as she watched Twilight's friends exchange handshakes. They picked up the supplies Celestia gave them and walked away from the statue. “I'll be there in a minute. I have some business to take care of first ...”

Twilight's friends sealed themselves up in a locker room. Reasoning the mental changes were more of a problem than the physical ones, Twilight had Fluttershy sit down on a bench while she got the amulet ready so they could work on curing her. It was one thing for Fluttershy's body to change into a well-endowed curvy vixen: it was another thing for her to go around shoving her flesh into peoples' faces.

“Okay, Fluttershy,” Twilight strung up the chain of the amulet in her fingers. “I want you to take a deep breath and clear your mind.”

Fluttershy inhaled and exhaled. “Clear my mind...”

Twilight dropped the amulet down, swinging it back and forth. “Focus on the amulet… follow its movements with your eyes… good… good… doing great so far. Now, I want to think about what happened earlier… I want you to think about this 'other you' that we saw.”

“The… other me that we saw,” Fluttershy repeated, her eyelids lowering as she relaxed.

“She doesn't exist,” Twilight said.

“She doesn't exist.”

“You are not her. You are not ...” Twilight made a sour face at having to say this name. “Big Boobs.”

Fluttershy's eye twitched, and she reached one hand to her breast as she felt the other personality try to force its way through. “I… am not… Big Boobs.” Fluttershy closed her eyes and squeezed her breast. “Oh, but I am! I am Big Boobs!”

“No, you're not.” Twilight insisted firmly. “Big Boobs is not a person. Big Boobs isn't even a name, it's a descriptor, and a descriptor that doesn't match you at that. Fluttershy, I want you to focus and -”

Whatever Twilight was going to tell Fluttershy to do, it was interrupted by Sunset Shimmer barging in on the room.

“Sunset Shimmer,” Twilight said as everyone but Fluttershy gave her an angry glare.

“This wasn't supposed to happen,” Sunset Shimmer said. “This wasn't the way it was supposed to go! You were SUPPOSED to be distracted while trying to cure her so you would be out of my way for the Fall Formal!”

“Ha!” Rainbow Dash pointed. “So you admit it!”

“I, uh, I don't suppose we could get you to say that on tape?” Applejack asked nervously, knowing Sunset was going to say no, if she even bothered to answer.

“Well, I'm not going to let you cure her.” Sunset Shimmer menacingly raised up a pink make-up mirror. “I'm going to see to it she stays a bimbo, and then I'm going to make the rest of you bimbos as well!”

“That's not going to happen.” Twilight said.

Sunset Shimmer marched up to Twilight Sparkle, getting into Twilight's face to the point their noses touched. “I'd like to see you try and stop me.”

“Big Boobs… I'm not… I am… I'm not… Big Boobs.” Fluttershyy repeated to herself, dazed and left in Twilight's half-finished trance.

A humming noise spread through the room.

“Do you hear that?” Sunset asked, looking around.

“I do.” Twilight answered, getting worried. "Where is it coming from?"

“Uh, girls?” Applejack said with worry. “Y'all might want to take a look at yer trinkets there!”

Sunset and Twilight raised their items to see the mirror and the amulet had crossed when Sunset marched up to Twilight and lowered her arms. Both items were emitting hums and glowing, pulsing with magic.

Sunset and Twilight exchanged looks. Recognizing their enchanted items could have unpredictable effects, they both hit the floor for cover, dropping the items to the ground where they remained cross.

“Big Boobs… I'm not… I'm not...” Fluttershy repeated, oblivious to the white light forming at her feet.

The rest of the girls followed Twilight's example and ducked for cover, moments before a white flash spread through the room, temporary making it difficult to see.

When the flash passed, Sunset Shimmer saw her chance to bail. Grabbing the mirror, which had stopped reacting, Sunset ran out of there.

“Is everyone okay?” Twilight asked.

“Yeah.”

“Think so.”

“Fine.”

“What about you, Fluttershy?” Twilight turned her head, followed by widening her eyes.

Fluttershy was lying down with her back to the floor.

On top of Fluttershy was a woman who looked just like Fluttershy, down to the tiniest details, except for her massive cleavage which threatened to burst through her shirt, which was clearly struggling.

“Oh, um… hello.” Fluttershy nervously greeted her.

“Hey there, you pretty little thing.” Big Boobs flicked her hand through her hair before leaning in on Fluttershy. “ “Come here often?”

Fluttershy shivered and blushed. "Oh, my ..."

"What ... is that?" Rainbow Dask asked, pointing at the two Fluttershies.

"If I had to guess ..." Twilight grimaced. "I'd say a whole of trouble."

Author's Notes:

The idea of Fluttershy getting separated from her bimbo alter self was something I thought of as a plot twist, which really should have gone into the middle of the story, rather than the start. But once I thought of it, I couldn't see any story beyond it. So into the first chapter it goes!

Still mad at those two for encouraging my bad behavior and leading me to write that first awful story to begin with though... YOU KNOW WHO YOU ARE.