A party game, of course!

Jason held out a hand, "Ladies, panties."

Despite some eyerolling, the women didn't hesitate to reach under their dresses and fish out their underwear.

Mom handed hers over first: simple pink silk, a little sweaty from the warmth of the day but otherwise unexciting. Jason passed these on to the younger son, who looked to be 20ish. He took them nervously but gingerly, as if he didn't have much experience with women's underwear.

Next came the older daughter, who was probably close to 30 -- the oldest of all the siblings -- and whose panties were a little more interesting than her mother's. They were also pink, but thong-cut in the back. She even had to work at digging them out of her cheeks for a second before getting them off. These he passed on to the older brother, who was only a year or two younger than her.

Finally, there was the birthday girl. Having just turned 18, she'd never been used before. She just watched nervously as her mother and sister surrendered their panties to this stranger for no reason whatsoever, and seemingly not even realizing she'd have to do it as well until Jason turned to her expectantly. Then he turned to her father.

"You do it," he ordered. "Crawl under the table and take off her panties. I want to see them, but they'll be yours to keep."

The father nodded obediently before falling to his hands and knees and disappearing under the table cloth. A moment later, his daughter yelped in embarrassed surprise, shifting awkwardly in her chair to let him reach what he needed, and then blushing bright purple. He emerged holding the sluttiest pair of panties by far -- a black lace g-string, with obvious arousal stains all over the inside of the crotch.

"Perfect," Jason grinned, rubbing his hands together. "Just perfect..."