Amy and Lina entered the store, and saw that it was much, much larger than the outside suggests.
"Let's stick together," Amy suggested.
"Sure" says Lina, already checking a display.
Lina finds some 'hello my name is...' stickers and calls Amy over. The pack was open and had a few stickers missing, as if someone else had used them already. Lina never did take these name tags seriously, always writing some other name on it. This time, she told Amy they would write one for each other. Amy thought for a moment, smiled, and scribbled down '2Busty4me Slutmuffin', as Lina constantly made fun of Amy for her (lack of) breast size. Lina wrote a much less embarrassing name for Amy, 'Kitty Vibe'. They swapped tags and Lina gasped at what any had written. She put it on anyway, just as Amy had. They both felt a wave pass over them and started to wonder what it was. Amy then felt her phone vibrate in her pocket and dug it out to find her mom had texted a while ago. She responded and checked for more missed texts. She found a disturbing absence of Lina in her conversations and contacts and a disturbing addition to a contact (and conversation) named '2Busty' with Lina's phone number in it. She rechecks her mom's data, and sure enough, the name reads 'Susan Vibes'.
Amy (now Kitty) gets Lina's (2Busty4me) attention and shows her the phone. Lina gasps, looks down at the piece of adhesive paper on her chest, and figures out that A) she now has always been named 2Busty4me and that Amy was always Kitty, and B) that she should have written 'Neverending Selfpleasure' on Amy's card instead.
Kitty and 2Busty decided first to leave the store and never come back, and then after seeing that they could not find the exit, that any transformations would be done together. However, as the store's magic worked to slow time, it also set the mandatory minimum escape fee at 5 transformations to coincide with the recent magical law passed.