Bribe them

"Umm... look, I'll be honest. I really, really need your underwear."

You slip your hand into your back pocket, pulling out your wallet. You flip it open, taking out a pair of twenties from your wallet.

"Look, I've forty dollars here. Can I just buy the pair?"

The girls stare at you for a moment, Nicole shaking her head as she pulls her underwear up her legs.

"Not a chance!" she mutters.

"Maybe..." Amy says, rolling her eyes. "Fuck it, forty it is."

Amy's hands slip up her sides, grabbing her panties by the sides and sliding it down her legs, pulling out a black cotton thong. She holds it out, offering it to you, as you hand her the forty bucks. You pluck the thong from her with a brief thanks, as Nicole continues glaring at you.

"Are you done now?"

"Yeah, I'll bounce."

You turn, quickly heading around the corner. You lift the thong up to your nose, taking a deep sniff of the dirty material, as a woman's scent fills your nostrils. Perfect...