Go along with Junpei’s suggestions.

(chapter originally by williwall at writing.com)

“W-w-w-what is this!?” demanded Yukari. She pulled a pair of thin black side-tie panties out of the bag. “You expect me to wear this?”

“Not just wear,” Junpei grinned. “You’re going to be doing some modelling snaps in that outfit for the yearbook, so you need to feel properly sexy. A deal’s a deal,” he concluded, taking out his cellphone.

“Fine,” she agreed reluctantly. There was a sort of twisted logic to the whole thing. “I’m going to get changed. Don’t you dare think about peeking.” she glowered.

“Wouldn't dream of it,” Junpei agreed.

Yukari returned, wearing the sundress. “Very nice,” Junpei said admiringly, taking a couple of pictures.

“You like?” giggled Yukari. She played with the hem of her dress teasingly. “Wouldn’t you love to see what’s inside?” Junpei gulped, as he was offered a tantalizing view of her inner thigh, and then a view down her cleavage as she leaned forward.

“Well tooooo bad,” Yukari said smugly, spinning around and skipping off ahead. Junpei was fun to tease. ‘Let him see? In his dreams,” she thought.

“Wait Yukari!” Junpei cried out. Yukari turned, grinning, walking backwards with her hands behind her back.

“Poor Junpei,” she smirked. “Whatever are you so hot and bothered about?”

“Not that!” Junpei exclaimed. “The grate!”

The grate at her feet, which she had just backed into, was the covering on the roof of the subway system down below. A sudden updraft swept through the subway system and up through the vent, catching the hem of Yukari’s sundress and lifting it very, very high.

Yukari shrieked, and hurriedly swatted her dress back down. “See,” Junpei grinned, cell phone camera in hand. “They look great on you.”

Yukari wordlessly turned and stormed off, but not before a second updraft nearly blew her dress up to her head, giving Junpei an excellent view of her firm bottom.

They made their way through the park. There, Yukari skipped up on to a bench. “Here,” she said, go ahead and take those pictures.”

As they went through several poses, Yukari felt herself loosening up. This was pretty fun. Hanging out with Junpei proved to be more fun than she expected.Teasing him even more so. It’s not even like the panties were a big deal. It was like modelling a swimsuit.

Another gust of wind swept across the park, playing with the hem of Yukari’s dress. She made no effort to pull it down. “Like what you see?” she grinned, a faint blush on her own cheeks.

Junpei stared up at her, dumbstruck. “P-pink...” was all he could get out.

“Aww, was that too much for you?” Yukari frowned. They weren’t pink, though. They were black. Like...

She looked up to see a little bit of flimsy black cloth, fluttering in the breeze. A pair of side-tie panties. Her panties. The previous gusts of wind had loosened the knots, allowing them to come undone. Which meant that right now, shw wasn’t...

Yukari’s face blazed crimson as she hurridly yanked her skirt down. She felt hot tears spring to the corners of her eyes. “Y-you saw?” she whimpered.

“Well...” Junpei said, grinning, and putting his phone away.

Yukari’s eyes widened. “Give me that, you pervert!”

She chased Junpei down through the park. She was slightly faster, even in heels, but as she caught up to him, the two ended up entangled and slid down the hill.