Marie goes to buy swimming clothes

(chapter originally by williwall on writing.com)

Marie picked up the bits of cloth gingerly. This was supposed to be swimwear, but it left very little to the imagination. She sighed. "Are you nearly done yet?" Yukiko called out behind her. "What's wrong? Are they too small?" She undid the buttons on Marie's shirt and reached underneath.

"W-what are you doing?!"

Yosuke turned to Yuu. "The girls sure are taking their time." A ear-piercing scream sounded through the store. He turned. "W-what was that?!"

Marie came storming out on stocking-clad feet. Yukiko trailed behind her, carrying several pairs of bikinis. "Waaait! You haven't even tried anything on!"

Marie whirled on the boys. "This girl is a pervert!"

Yosuke stared at her. "Who?"

"Marie! Y-you're indecent!"

Marie looked down. Her shirt was open, revealing her impressive cleavage and light blue bra. At that moment, her skirt, which was partially undone, slid down her striped stockings to come to a rest at her feet. She turned scarlet, and dropped to the ground, covering her legs.

Yukiko looked at her thoughtfully. "Hm, maybe a trip to the beach isn't such a good idea."

What sort of a class trip should they take?