Yumi looked around the area just inside the store entrance, around the help desk, and she saw a customer browsing one of the promotional displays. She was in her mid-twenties, blonde and relatively cute, wearing a blouse, jacket and skirt, with a pair of flats. Yumi had to wonder what it would be like being Caucasian, and so after gesturing for her friends to touch the remote with her (only brief contact with the interface was required), she decided to try it out on the young British woman.
Yumi concentrated as the interface linked to her mind, then Yumi felt what could only be described as a 'warm tingle' that ran through her. The legs of her jeans retreated up her legs slightly as she grew a couple of inches to 5' 6", her skin lightened a little, her breasts gained about half a cup size, her black hair began changing to a blonde color and most notably her beautiful almond-shaped eyes became rounder as Yumi traded her ethnicity with the English woman.
Sachi and Miyuki looked on in amazement as their friend transformed before their eyes. "Oh wow, my skin, my hair... did it work?" Yumi spoke up, her voice had lost any hint of a Japanese accent, though she still knew how to talk in her native language.
"Yes it did!" Sachi nodded.
The trio of girls then looked back at the young woman doing her shopping. She was now a little shorter, with long black hair, had slightly smaller breasts and now looked to be of Japanese descent. What's more, she remained totally unaware of her change. Yumi just grinned at her two friends, feeling quite proud of her father's invention. "Told you it would work." She giggled.
"You look so... different Yumi." Sachi gasped, looking her friend over.
"You're gonna swap back right?" Miyuki asked, with a raised eyebrow.
Yumi gave it a moment's though, then shrugged. "Maybe, but not yet. It doesn't matter if that woman goes home. I can always swap ethnicities with someone else if I get bored." She muttered,
"Yeah but how many other Japanese girls are there around here?" Miyuki mumbled..
At that moment, one of the Wilko staff, Naomi, happened to walk into view. "Well what do you know, look." Yumi smirked, pointing at the Japanese-born employee as she carried a couple of boxes around to another section.
"Wow, I wonder which town her family are from?" Sachi wondered out loud.
"Never mind her for now, how about we have some fun with this?" Yumi grinned, holding up her remote. "Now we know it works. Come on... you know you both want to, right?" She said enticingly.
"What kind of 'fun' exactly?" Miyuki asked, her curiosity and excitement peaked.