It had been over an hour since Mistress had zapped David, he should have become Pinkie Pie by now...Fearing something had gone wrong with the spell, Mistress decided she needed to go check on him. Walking up to the pink door, she pressed her ear against it...and heard nothing. Getting very worried now, she called out for him.

"David? Daaaviiid!" Mistress waited for a response, receiving none...

Pinkie was hiding just around the corner, hoping that silly A.I. wouldn't spoil the surprise!
Oh boy, I can't wait! Missy's gonna see me! I wonder if she'll like it??? Pinkie thought to herself excitedly! She prepared to pounce...

Mistress, now truly concerned for the well being of her friend, said to herself, "Hmm...maybe she'll only answer to Pinkie?" She then called out in a louder voice, "Pinkie Pie! Where are you?"

"SURPRISE!!!"

Pinkie tackle hugged Mistress with incredible, almost super human speed! Mistress instinctively charged her magic, unable to dispell it before Pinkie made contact! The spell that Mistress had cast on David interacted with Mistress's poorly formed defensive spell, causing a chain reaction! Mistress quickly shoved Pinkie off of herself, but it was too late!

Pinkie recovered from the shove, a look of surprise on her face, which was quickly followed by a look of regret. "Oh I'm sorry I just thought -" Mistress interrupted Pinkie, yelling at her, "I don't care WHAT you thought! Do you know what you just DID!?"

Mistress could already feel the spell taking hold of her...

Pinkie could see that Mistress was upset... "Well...I hugged you...is that bad?"

Mistress facepalmed. "YES! I mean no, but some residual magic from the spell went into me when you did that!"

Ooh, magical!

Mistress's eyes went wide and turned blue as a feeling of dread welled up inside her...Another personality had just formed inside her mind! An infectious personality that sought to take her over! She had to do something!

Pinkie didn't quite understand what Mistress was talking about, having mostly forgotten the finer details of how Mistress's magic worked. "Uh...I don't really get it...but I think I did something wrong?"

Realizing that she had to work fast, Mistress said, "Nevermind! There's no time! I'm gonna turn into a Pinkie too!" Mistress placed her hands on either side of her head, struggling to focus her rapidly changing mind on coming up with a counterspell! In the case of HER magic, once a spell was cast on a target, it was very difficult to stop it!

Pinkie felt horrible about putting Mistress into this situation! She could see that she was having a hard time, so she said, "I'm reeally sorry! Is there anything I can do to help -" Mistress interrupted Pinkie, shouting at first, "NO! No...just...STAND there and do nothing! I gotta focus!" As Mistress spoke, her purple tube top became a very light pink, and her black jacket turned a dark blue, already looking more like Pinkie's outfit!

Pinkie herself just whimpered in sadness, only able to watch as Mistress's black skirt turned purple...

You know, you didn't have to be such a meanie!

Mistress ignored the voice in her head, trying to dominate it with her own thoughts!
This is NOT happening! The last this anyone needs is a magical Pinkie, let alone one with MY magic!

Oh c'mon! It'll be super duper fun!

Despite her best attempts, she could feel the foreign personality steadily gaining ground inside her mind...Her black stockings vanished into thin air, causing her to feel the cool air on her legs...Crap! She had to think, dammit! But even as she thought this, her thoughts were slowly becoming distracted by all the super fun things she could do with her magic~!

I'm not gonna be a Pinkie! Mistress desperately thought to herself, even as her outfit fully changed color to match Pinkie's colors!

Oh yes you are!!

Pinkie looked on as Mistress struggled to save her identity, getting more and more worried! This really didn't look good! But she couldn't help her, Mistress said she couldn't!

Mistress's skin started to turn a very light pink as Mistress grit her teeth in frustration!
It's happening too fast...! C-Can't think...!
Short white socks appeared on Mistress's feet as her now white tank top became longer, no longer exposing her belly button...

C'mon, just give up! You know you waaannaaa~...

Mistress giggled as her sky blue Mary Janes became low-heeled boots! Her hair auburn quickly started to grow longer and messier, even as she struggled to get ahold of herself!

Pinkie started to tear up as she watched her friend slowly becoming a clone of HER! This was all her fault...

Mistress giggled again as she began losing the mental battle for control...! Her auburn hair poofed out with the same sound effect as David's, now looking identical to Pinkie's aside from the color!

"NO!" Mistress desperately cast a guiding spell on herself! If she couldn't stop the spell completely, she could at least change its direction!

Come on, stop being so silly!
I can't let this happen...*Giggle*...I gotta fight it! Mistress forced a frown onto her face...
What...
Won't...let you take me...!
are... I... we...

Pinkie desperately resisted the urge to start cheering Mistress on! She resolved to just think her cheers really really loud! Missy Missy she's our girl! I she can't do it no one will!

Mistress's skin turned pure white as the voice in her head went completely silent...Mistress was completely spent, magically and mentally. She could barely even stand, let alone pay attention to her fabulous violet boots...

Without her continued resistance, the magic of the altered spell washed over her, her outfit rapidly transforming into a much more stylish design~...

Her messy auburn hair styled itself into gorgeous multi-layered side swept curls, before turning a beautiful shade of indigo~!

Her outfit finished it's transition into fabulosity with the addition of an indigo belt and a baby blue blouse with a plunging neckline~! Mistress looked down at herself with a resigned look on her beautiful face, even as her bosom plumped up another cup size, now a luscious DD-cup~...

This is all so...horrid... As a finishing touch, Rarity's pearl necklace became a lovely sapphire one, with a matching hairclip appearing to tie back a few wayward strands~...

Blinking her big, beautiful blue eyes, Rarity came to terms with her predicament. She could at least still remember being Mistress, and still had her transformative magic, but...her entire mindset had completely changed! She was now Rarity in personality, tastes, likes and dislikes, everything but her memories!

"Well...I must say, that was QUITE the experience!" Rarity said to Pinkie, the latter looking at 'Mistress' with a worried look on her face.

Pinkie frowned, her hair deflating slightly..."Missy...? Is that you...?"

Missy! Haha! Pinkie can be so funny sometimes! Poor dear looks beside herself with worry... Rarity thought to herself, a sad smile on her face. "...Not quite, dear. I know who this 'Missy' is, and I know she's technically ME...but...I am Rarity! I truly am...! I simply cannot describe it any other way!" Rarity finished with a pirouette, a huge grin on her face!

"It's like the other you was just a movie or a book even though you KNOW it was all real but you don't FEEL like it's real even though you know it is???"

Rarity stared at Pinkie, her mind taking a moment to process what she had just heard. "...Yes. That." Rarity finally said. "...However! I know how to fix it!"

Pinkie felt her heart soar with joy! Of course Missy, er, Rarity would know what to do! She super smart, just like Twilight! "Great! How?" Pinkie asked, a hopeful look on her face!

Rarity sighed. "...We wait. It'll wear off on its own in a week or so..." She had, after all, designed the spell to be temporary. It would only make sense that she would just turn back on her own eventually. But what to do in the meantime...?

Pinkie frowned at this revelation. That was kind of anti-climactic..."Oh...soooooo...what do you wanna do till then?"

Rarity put her hand to her chin in thought. The first thing that came to mind was her bimbos, but...Rarity was straight, and since she WAS Rarity, she was straight now too...Really now, why couldn't Mistress have kept even ONE man around here? Ah well, she supposed she wouldn't be able to touch them anyway, since she was likely contagious just like Pinkie was...

The next thing she thought of was her video games, but again, Rarity wasn't much of a gamer, so she had little to no interest in them now. It was so bizarre. She could remember playing Halo, CoD, racing games, fighting games, so many, and yet...Now she felt nothing for them.

What else...she certainly couldn't go out like this, not that Mistress was much of a socialite. Really, she only had a couple actual friends! That was no way to live...

That only left one thing...

After telling Coco about what had happened (Poor thing was mortified that her Mistress had become "Like, totally boring and stuff"), Rarity found herself in her room. Such a drab, dull place...Sure, the walls actually had a color other than boring grey, but they were all the same! The ceiling and floor as well, all the same shade of purple! She really would need to redecorate. Surely Mistress would love it?

But that was for later! For now, Rarity desperately needed some more variety in her wardrobe. Really, only ONE outfit!? Well, technically two if you counted the workout one. But still! This simply wouldn't do! Conjuring her magic, now a bright blue instead of purple, Rarity teleported her current outfit into the new closet she had added!

Standing in the nude, she took a moment, to admire her impressive bust and beautiful curves, before summoning her magic again to create a new outfit for herself! Feeling like showing off to herself, she first gave herself a real golden necklace, complete with an amethyst in the center! She then added some golden bracelets on both wrists! She then moved on to the main outfit, creating a beautiful blue azure blue mini-dress, with a cyber grape pencil skirt for some modesty. She then added some white high-heeled boots on her feet, and for some extra flare, added various diamond shaped designs into the cloth~!

After taking a few moments to admire her work, she teleported the outfit into the closet and prepared to create the next one! Not wasting any time, she started with the main dress this time, opting for a layered flaring dress with only a single shoulder strap on the left side, her right shoulder left completely bare~! She then added some sapphire encrusted knee-high boots. Ooh, she felt so scandalously sexy in this outfit~...Definitely keeping this one~!

Again teleporting her new outfit into the closet, she took a moment to think of another idea...Ooh, she could just do this all day!

Author's Note

I hope I did the mental transformation justice^^
I also hope I'm pulling Rarity's personality off correctly :)