I have a guy who comes to my place with his wife's used panties, I lick and smell them while he sucks my cock. He wants to watch a guy fuck her but she isn't up for it so he thinks me playing with her used panties is the next best thing
Do what I do when you go round friends look in the bathroom you might find some I have and cum in them and left them for her to find and see what I have done
I've swapped my wifes worn panties and the guy filmed himself wanking and cumming in them, a truly memorable experience, now I always carry a couple of pairs in my car just in case.