Clothes are Complicated (Fluff)
(Rin)
With Kuro's eyesight, it wasn't hard to pick out out Shirou and Sasaku even among a rather busy crowd. The Archer simply went to the roof of a nearby building in spirit form, then returned to Rin after spotting their targets. Compared to her earlier battle armor and cloak, Kuro looked a lot more like her apparent age with the long pink shirt and light purple skirt that Rin had dug up for her while at home earlier.
The two pairs met after Rin spent few minutes pushing through the crowd. Kuro had no issues just slipping through everyone, which was uncanny even given her size advantage in doing so. Shirou and Sasaku had moved down the road a decent distance from where they had first been spotted - though by the time Rin was getting lost in the crowd, Kuro was close enough to Sasaku to track her by the latter's magical signature. Needless to say, Rin simply followed her Servant without needing to actually see her.
Rin's first observation was that while Shirou was rather anxiously looking around the area, Sasaku was simply or rather calmly systematically scanning the area as though reading a book or something like that. Which looked really uncanny given she still looked like a child despite acting more like a veteran soldier. Or perhaps a certain well-known ruthless assassin...
A frowning Kuro didn't notice as Rin walked up to her. The magus followed her Servant's line of sight and noticed that her Master counterpart was holding his Servant's hand rather loosely. -Huh? Hmm.-
"Kuro, is something wrong?" The smaller girl turned to her with a straight face. "Oh I was thinking he wouldn't occupy her sword arm if he knew what he was doing." Rin didn't believe it in the slightest. Her Servant definitely had some connection with Shirou and she didn't like not knowing. Mentally, she scheduled a thorough digging-for-the-truth session for later that night.
"It's bright out, nothing will happen here," she replied dismissively.
"That's naive, Master. For example, if something like a bomb went off at this moment, killing you and Shirou. That's two Masters down without a fight."
"Do you detect any Servants?" Rin asked, though the answer came to her uncomfortably quickly even before Kuro's reply. "No, but anyone can press a detonator."
To shake off the sudden sense of dread filling her, Rin stepped forth and grabbed Sasaku's free hand. The Saber glared at her for that. Kuro joined them after a few moments with a bounce in her step that Rin couldn't tell if it was real or not.
"Ah, Emiya-chan," Rin smiled with a familiarity and warmth that she hoped would thaw Sasaku's cold expression at least a little. "Even if you're new here, you can't rely on your brother for something like shopping for clothes you know~" She tried to pull the other girl towards her as subtly as possible since they had caught Shriou's attention, but Sasaku refused to budge any more than a solid statue would.
"Tohsaka-san, what's this about?" Rin nearly ground her teeth as Shriou made it quite clear he had noticed the struggle, which is to say her total loss.
"I was going to take your sister shopping, remember?" she said, trying to sound helpfully as possible given her rising frustration. It seemed her presence was because Shirou thought it would be a good idea and convinced Sasaku, rather than the reverse. "After all, I do know the shops pretty well."
"That's true," Shirou mused, his recognition of the situation's awkwardness showing on his face. "I'll just leave you t-"
"No, it's fine. Come with us," Sasaku insisted. It would have been cute, but Rin really wanted to get at Saber without the male Emiya getting in the way.
"Now now, Tohsaka's a good friend, and besides she knows the fashion. Though," he paused and eyed Rin's clothes dubiously. "It might be best to not just copy her fashion."
"Why, you..." she growled. He had definitely added that upon noticing the bottom portion of her casual wear. "That's hardly for you to decide-"
"I agree," Sasaku piped up. "It definitely attracts too much attention."
"Enough." Rin was fuming as the Master-Servant pair teamed up against her, if unwittingly. She pointed off in a random direction. "I'll take care of your sister. Emiya-kun, you have your own priorities, right?"
"Kuro, do something or we'll be here all day." Her Archer gave her a dubious look before pushing in between Sasaku and Shirou, who was then forced to let go. Kuro then simply took Sasaku's hand and started pulling her in the direction Rin had indicated, before pausing.
"Uh Rin," Kuro said cautiously. "That shop is..."
She turned to see what it was. Of course, why wouldn't it be a bloody lingerie shop. Actually wait, this was the best excuse. "Come on Emiya-chan," she muttered coaxingly.
"I have plenty of those," Sasaku replied indifferently, but she gave in immediately when Shirou shrugged and told her "Off you go." Rin frowned upon discovering that now she could lead Sasaku around. What the hell, why can't my Kuro be obedient like that?
"Master, you don't actually want me to follow you there, right?"
"What is it now?"
"Hello, I'm like ten, that makes very little sense. I'll go gather information with Shirou-nii." So that was her true intention... so be it then.
"Fine, keep in touch."
Eh, why don't I feel like dressing up Kuro as well? Must be because she's the annoying and mischievous sort, while Sasaku is so docile I can't help but want to bully her a little.
As they neared the shop, Rin started eying some of the merchandise. Well, the ones up front were simply the rather fancy type, if of rather standard design, a little further in were the really risque designs. And if she guessed right, extremely expensive. She continued walking towards it with a steady pace. Not only were they expensive, but she really had no use for something only worn in the bedroom.
However a magus must seek after hidden truths! She turned around and saw that the Servant following her had just finished scanning the shop, and appeared unimpressed. "Well," Rin said after Sasaku's attention returned to her. "Maybe some of this is a bit too early for you-"
"I already said I had plenty, didn't I?" Sasaku just frowned, annoying the magus. "And much better, too."
"What the hell?" Rin muttered. Oh right, Servants are weird, common sense doesn't quite apply to them. Even if Kuro is apparently as old as she looks, Sasaku might not.
Sasaku smiled rather cutely before adding, "Perhaps you don't have anyone to wear these for?" Rin just coughed and started towards another shop.
"What about this one?" A few of the racks seemed to hold rather elaborate clothing. Eh, what's up with the shops in this place? Even if they didn't buy any, she wondered how some of the frilly dresses might look on the smaller girl. Or maybe that one with the ribbons on it?
"They seem unlikely to fit in," Sasaku commented as Rin entered the shop and began looking at the dresses. Which she'd never actually buy let alone wear herself. The prices were also what you'd expect, which is to say rather high, but Sasaku would probably be spending Emiya's money, right?
"Nah, these will be just right. Try it on." She pushed Sasaku towards one of the fitting rooms with a couple of the dresses on her arm.
"What about you?" came the reply from behind the light door. "Oh don't worry about me, I already have a full wardrobe you know? Haha-?" A dress she hadn't picked out came flying over the door and landed on her.
"Oh Rin, that would look perfect on you," a suddenly-appearing Kuro said while smirking. "Shirou-nii said I should go with you two, seems it was a great idea."
Kuro's Master couldn't resist as she was easily herded into another changing room by her Servant, who had a "do it or I'll make you anyway, so just do it" grin on the whole time.
(A couple minutes later)
"Why, Master, that looks pretty good on you." Kuro eyes sparkled as she look in Rin's new red-and-white clad form. "Though I'd say the white under-skirt should be a bit longer, it sorta lacks impact from any angle other than the front..." She spun Rin about to look. "I wonder what Sasaku would think."
"What? Kuro, I'm not going to-" Rin almost screamed as Kuro swiftly grabbed her clothes and ran out, leaving her with only the dress she had on. "Deal with it, Master."
Looking around, Rin stepped out slowly and found Sasaku was standing next to Kuro. The older girl had taken custody of Rin's clothes and appeared to be studying them. Her mostly white dress had some simple blue accents that looked quite clean in composition. Though blue didn't quite go well with her hair (pinkish) or eyes (green).
"Tohsaka-san, you've modified this?" Sasaku asked while tossing the black miniskirt back towards its owner. The red top soon followed. Rin blinked before understanding the question. "Oh yes, I-" used magecraft on it so it wouldn't flap about embarrassingly is not what she said out loud.
"You shouldn't wear something like that if you can't handle the consequences," the Servant only replied dryly, before changing gears to Rin's current attire. "Though I'm not sure what the consequences of that would be."
Rin flushed, remembering how rather gaudily her the front of her dress was decorated in comparison to Sasaku's. Kuro laughed again after looking at the gold thread embroidery and said brightly, "But it fits, right? That sense of I have something to prove, you know? What do you think, Shirou-nii?"
Shirou appeared around the corner as Kuro called for him, and just stopped in his tracks. "Eh?"
Rin immediately turned and ran back into the changing area without another word, her face now a good match for her dress. "Kuro, you traitor!"
(Shirou)
Kuro's laughter proved that she had been setting him up. Or rather, setting Rin up. He didn't mind, but Rin definitely had, and this meant dealing with the inevitable fallout.
"Master?" The soft inquiry (How is it that telepathic communication can even convey that?) pulled his attention towards his Servant. "Shirou-nii, how does it look?" she preened slightly under his eyes.
"Hm, it looks good," he said reflexively. "Though maybe a bit much for just walking about or shopping, I think."
She turned around slowly so he could see the rest of the outfit. "Ok. Do you like it?" Must be because I'm paying for it, huh?
"Yeah," he said simply, before Kuro spoke up with, "See Rin, you should've done that too." A flushed Rin who had reappeared with her original clothes threw the dress she had just changed out of at Kuro. "I didn't need it in the first place!"
"Tohsaka-san, please don't make a scene."
(Rin)
Rin scowled as Kuro quickly escaped with the excuse of returning the dress to its rack. She'll probably just dump it somewhere convenient.
"While Rin might know more about women's fashion than I do, she's either holding back or just messing with you," Shirou concluded his analysis of the humiliating events evenly. "I might not be an expert, but if you want-"
"Yes." Sasaku said immediately, as Kuro chuckled in amusement from nearby.
"And how would you know?" Rin demanded, feeling the sting of rejection. Even if only in terms of going shopping.
"I've seen Sakura in casual-wear while out shopping." Ugh, foiled by his powers of observation... wait, why Sakura specifically rather than just everyone else out shopping?
.
Notes:
Yes, Kuro is stronger than Sasaku, it should be obvious to you why =P
Rin's dress was basically like one of the Kaleido Ruby ones.
Sasaku's would be similar to Nanoha (Season 1) I guess, but without the odd puffy sleeve, and a roughly knee-length skirt on it rather than a really long one.
I labelled this as fluff, but there might be some plot-relevant details here. But it's mostly content meant for amusement that serious plot-advancement.
This Shirou doesn't have ((Harem Protagonist EX)) or whatever, so don't read too much into it if some of the female characters are having fun / messing about. Just FYI :)