[Bimbofication, Brain Drain]

Tohsaka Rin was a girl that had been through a lot. But she thought she could put the Fuyuki Holy Grail War behind her and study to become an even greater magus than before, and for that reason she headed for London to try and join the Clock Tower to put a real start to her career.

That was how it started. And how was it currently going? Well, if you could consider 'drooling while her brain was leaking out of her ears after casting a spell meant to relieve stress that turned out to actually just make her lose a lot of her built up intelligence whether through it pouring out of her ears or out from between her thighs' as a good thing, then she was having a great time. She was just having a bit of difficulty actually keeping track of anything. Besides those pretty lights that were flicking in front of her eyes that were making it really hard to think...

A snap echoed out as the colors suddenly stopped. And a very familiar sounding laugh echoed through the brunette's room, which would've usually made Rin turn around to face the culprit behind that laugh, but it just made her giggle as she tried to follow the laughter's tempo.

"Ohohoho! Well well, look what I've stumbled upon! Tohsaka, with all of her brains pooled onto the floor! I should've just let you keep drooling them out of your empty little head, but to beat you while you're completely and utterly empty wouldn't be nearly as fun as seeing your pouting and frustrated face when I prove my superiority!" Luviagelita Edelfelt, affectionally dubbed Luvia by her peers and her currently empty-headed rival, laughed her way into the young lady's dorm room. "Though it doesn't surprise me that somebody like you would fall for one of the simplest tricks in the book. What was the first lesson that you were taught as a Magus, Tohsaka? Was it not to remain skeptical in the face of instant gratification, since it could easily and very quickly result in your complete and utter demise?"

Rin listened to Luvia speak all those big and fancy words, drooling a bit before nodding. "Mmmhmmmm." She understood absolutely none of it. But she liked Luvia, so whatever she said had to be right. That was just how things like these worked, wasn't it? Friends, especially really smart friends like Luvia, were always right!

Luvia felt a bit of sweat run down the side of her head. Usually that type of spell wasn't nearly as effective as this. But it seemed as if, in her pursuit of complete and utter relaxation, Tohsaka had managed to cast a version that was even stronger than the version that Luvia was familiar with. Not that she would ever use a spell like that on herself, she wasn't the type that would shatter from a bit of hard studying.

Still, if she was this empty-headed, then... Oh, she could completely and utterly ruin her rival's reputation. And make her dependent on her at the same time. It was the perfect plan, especially considering how little time she had to come up with. And she even had the perfect method of doing so already plotted out, she just needed the girl to go along with her suggestion.

"Ohoho. Well, Tohsaka. Since I've done you a solid favor and saved you from your own hubris, I would like to ask you a favor in return. Join me for a stroll this fine day. There are no classes, and there is no duties that we need to tend to. Therefore, it would be best for us rivals to get to know each other even more. And I know quite a few spots here in London that accept Magi for everything they are. I'm sure they'll love to give you a crash course in ways to improve yourself." Luvia chimed, lying through her teeth. She wasn't going to bring the girl to any kind of Magus-operated joint. She was going to make sure that she would be completely unrecognizable by the time they started to return to the Clock Tower. The other students would be able to recognize her based on her Mana alone, but she would be completely ruined beyond that. A perfect plan...

Rin giggled. Seh still didn't understand everything that Luvia was telling her, but she got the general vibe that she wanted to take her someplace. And since they were really great friends (that's what rivals were, right?) it only made sense to join her. Not that she'd be able to find her way through London, so she'd have to stick really close to her. "Okaaaay, Luvia!"

Luvia blinked for a moment as Tohsaka wrapped her arms around her arm, just like they were lovers or close friends. It was so unexpected that she quickly started to blush before clearing her throat. "Y-Yes, you understand exactly where you belong. It's a good thing that hasn't drooled out through your holes, Tohsaka!" The much richer girl laughed, but you could make out the sounds of her voice cracking as she tried to maintain some form dignity. Not that it was working, but considering her partner was somebody who couldn't pick up on the intricacies of social cues, it was totally okay.

Indeed, Rin didn't pick up on a sliver of all of this. She just held onto her friend's arm as they left her dorm room, hoping to have such a great time in the city with one of her very best friends.

She was sure that her friend had only the best intentions in mind for her, not at all realizing what was planned for her.

---

Rin blinked a little as she sat in a very big chair with her head partly stuffed into some sort of high tech machine. It was really neat and it was really heavy looking, and yet it wasn't falling onto her as it cradled her hair. It was enough to make her normal self gasp in awe, while her current stupified self could only just gasp a bit.

She had kinda blanked out while she was clinging so closely to Luvia that she didn't know where she was. Just that she was in a really nice chair and there was a really nice lady asking her about all sorts of questions that she couldn't answer, but Luvia was right there to answer all of them. And eventually, the nice lady went away and she was left all alone with her friend once more. Luvia didn't really talk to her though, but that was okay. She could just sit there and wait.

Luvia was mildly frustrated at this point. Mostly because being stuck to this girl was making it harder and harder for her to keep calm. She knew that she had some unresolved feelings regarding Tohsaka, but this was ridiculous. But if there was one thing that could make her calm down, it was making the girl look different. If Tohsaka didn't look like Tohsaka, she definitely wouldn't be triggering the same sort of feelings. Which meant that she could enjoy the humiliation in all of its glory.

"Rejoice, Tohsaka. You'll have beautiful golden locks once this machine is done with you. They'll be just as long and as curly as mine, consider it a reward for being a good friend!" Luvia laughed as she tapped a button on the machine. Most of that talk earlier had been simple instructions on how to operate it, just so she could have some time alone with her fellow Magus.

Rin gasped in surprise. They were going to have matching hair? Oh, that was just perfect! So much so that she almost started to push her hair into the machine to try and make it go faster, only to finally notice that her hands had been locked by a set of restraints that popped out of the armrests. Guess the nice lady didn't want her to cause any trouble. What a shame, she really just wanted to look like her bestie!

As the machine did what it was supposed to, it was like Rin could feel what little brain she had left being tugged at. Weird, was that supposed to happen? She really didn't pay attention to it much after that, because the tugging was making a bit more of her smarts drool out of her ears thanks to the spell that was still active.

The reason behind the hair being tugged was simple. To thoroughly and permanently color a girl like her's roots, the color needed to seep into the brain itself. Once it made sure that it had a connection that allowed it to seep its colors that deep, the machine just quietly hummed and went to work.

Rin giggled as she felt a tingle inside her otherwise empty head, not really watching her hair as it turned from brown to a very rich golden shade of blonde, all while the ends of her hair started to curl up until they formed into ringlets that mimicked the ones that her bestie had. The process itself making her moan, the roots being colored stimulating what little sense she had left inside that pretty head of hers.

Until the machine chugged to a complete stop, raising itself back up ever so slightly to reveal Rin's brand new hairstyle... And how much prettier she looked than Luvia due to how shiny her brand new hairdo was. So much so that Luvia was forced to block her eyes a bit, the sheer shine reflecting off that beautiful hair nearly blinding her.

"How do I look, Luvia?" Rin giggled as she slowly started to play with her hair. It was really smooth and almost silk-like despite being so shiny. "It looks so much like yours! Makes me wanna try to laugh just like you, like... Oho! Oho-ho-ho!" She tried her best. But she just ended up sounding like an aging mall santa instead. A for effort at least.

"O-Ohohoho! You look fantastic, Tohsaka! Much like yours truly. You're heading down a path of greatness, and it's all thanks to me! Don't be afraid to praise me, I'm a very modest kind of girl!" Luvia cried out while still blocking her eyes a bit, her cheeks quickly flushing red as she was pecked on the cheek by the stupified girl. She had taken it completely seriously yet again...

As Rin started to walk outside, Luvia huffed and climbed into the chair, shoving the machine down on her head. She wasn't about to be outdone...

---

The next place they stopped at was a place that was made for body modding. Not that Rin knew what that meant, it was just a place that her bestie dragged her to. She also really didn't pay attention to where they were going, because Luvia's brand new platinum blonde hair was soooo pretty...

"Like, Rin." Luvia spoke up, sounding at least a little less clever than before. But she was still plenty clever, even though her hair getting colored had leaked into her brain. "You might have my kind of hair, but now we're going to get even better together. Have you ever had a tan, or is that stuff not a thing from, like, where you come from?"

A tan..? What did that mean, exactly? Rin tried to ponder the question for a moment as she just tilted her head bit by bit, looking as adorably perplexed as usual. So much so that Luvia just gave up trying to explain what she was trying to do.

Thankfully, she didn't have to deal with anybody this time around. The joint she had popped into had self-service stations powered by one's own Mana. Sure, this place was practically always on the verge of being shut down by the Clock Tower due to the near-heretical way they merged the advancement of technology with the Mana that was supposed to be for Magi and Magi alone, but that didn't matter to her right now. What mattered right now was making Rin look even weirder! 'Cuz otherwise she might just fall for her if she keeps clinging to her arm!

Shoving her friend a bit too roughly into a tanning box that was more like a coffin with how tight it was once it closed around the girl inside it, Luvia watched as she rubbed her hands together. There was no way that she'd end up feeling envious of Rin this time around. Like, who even wanted to be this deeply tanned?

At least, that's what she thought. But when she looked at the big window and kept a close eye on Rin, she could feel her thighs pinching together ever so slightly as that incredibly pale asian girl started to darken more and more. Bit by bit by bit...

Rin, meanwhile? Oh, she was on the verge of cumming. Part of having her Mana used as the fuel for this meant that she was getting so much feedback that her eyes were practically rolling into the back of her head. Not only that, but the treatment would drastically lower her ability to cast magic until she returned to normal. And since Luvia didn't even think of trying to stop it once it had started, it would be very hard to remove...

Not that she cared too much. She couldn't really even think. She was just sitting inside the tanning 'coffin', enjoying the way that she was being proverbially baked. Her body trembling as her clothes started getting more than a little stuffy. Sure, her normal clothes were doing a good job of protecting her against the light, but that just meant that when the magic that had to travel through her body needed to tan her covered areas, they would be pumped full of an extra powerful dose.

Which Luvia was given a front row seat to, as Rin's shirt tore open to reveal a fat pair of tits that were... Oh goodness they weren't just bigger than her own, they were bigger than the girl's head! Just the sight of them was making the Finnish girl tremble in frustration. There was no way that she'd let Rin beat her like this!

Throwing caution to the wind, since she knew exactly how dangerous these things could be when powered by a genuine and overly powerful Magus like her, Luvia opened a 'coffin' of her own and stuffed her pretty little body inside, slamming it shut and letting it seal itself as she watched the magic light show start to pour across her.

Almost immediately she felt what a bad idea this had been. Because unlike Rin, who had grown numb to a lot of the brain draining effects of what Luvia had tried to push her through, the platinum blonde could feel every little attempt to ruin her thoughts. So much so that her eyes almost started to roll into the back of her head as the light was pulling on every little bit of her brain.

While her own magic was being used to tear her apart, Luvia's nothern complexion started to deepen and darken just like Rin's had, as her skin turned from pure white to a tender and delicious dark brown, which not only looked absolutely obnoxiously thick to the point where it looked like paint had been splashed onto her body again and again...

But like her friend, she had made the mistake of getting inside while she was still wearing clothes. Something that the magic pouring through her solved by concentrating a ton of it in her tits, causing them both to explode out as they doubled in size. The sheer softness and the new vastness of her cleavage made her perfect for titfucks, and her lower assets weren't far behind as those thighs ruined her skirt by tearing it to shreds and exposing her darkened and thoroughly plumped up thunder thighs glistening against the light.

What really sealed the deal for their continued changes was the fact that the 'coffins' couldn't be opened from the inside. Leaving them both to moan and gasp and giggle as they were baked until they were way beyond overdone, leaving them stuck in there until somebody would happen to let them out.

Not that they'd notice, with all the giggly thoughts leaking out of their ears.

---

"Where could they have gone?"

Emiya Shirou, the 'winner' of the Holy Grail War and a close friend of Rin, was currently busy walking through the streets of London. He found Rin missing from her dorm room and a very suspicious puddle on the floor, so he had decided to go out and try to find the two before it was too late.

"Shirouuuuu!" "Emiyaaaaa!"

Thankfully, he didn't have to look for long, as he could hear their voices echoing not far from where he was waiting. Even if both of them sounded a little... Friendlier than usual. Weird, it wasn't often that the two were able to get along due to their respective competitive spirits.

Luvia giggled as she ran over towards the redheaded boy that her bestie Rinny liked. He was so nice and strong and it naturally attracted somebody as needy and as empty-headed as her. And she was sure that, even though she was so tanned that it was like her dark skin was absorbing light as it poured onto her, and even though she was wearing a flimsy tiger-print bikini that was barely able to hide anything with how it dug into her really erect nipples or thoroughly tenderized pussylips, he wouldn't be bothered at all!

Rin waved as she was dagged along by Luvia, giggling a bit herself. She looked almost identical to her platinum blonde friend, the main difference being that she skipped out on the really tight bikini and just went with heart-shaped pasties that did very little to make her preserve any kind of modesty, but since the nice man that let them out told her that it was really in, she couldn't help but believe him. She had forgotten all about being careful, since that little smidge of sensibility had been baked out of her brain long ago. Now there was just a cute terribly tanned bimbo that loved her bestie so much, and loved Emiya almost as much. Not that she had said so, but she'd probably remember to do so at some point!

Shirou took a brief look at the two before smiling. "I'm glad to see you're both getting along. We really should get home soon though, curfew's almost up." He didn't really think much of their makeover. They could handle themselves, and they did seem much more enthusiastic and happy than when he last saw them.

It also didn't bother him how they were quick to wrap their arms around him, nor how they started giggling a little too much while he helped them back to the dorm. Had they had too much to drink? Nah, they were probably just high on their friendship.

Little did he know that those two ditzes were going to finish off their day together by having a boy for dinner. Especially one as handsome as him. They had all but forgotten how the day had started. But at least once it was over, they wouldn't have any stress left inside their heads.

But the shame that came with their smarts returning would last an eternity...