You quietly explain that if Wendy wnats the cash, which you definitely have, she has to become your sex **** for the next week. No holds barred, no holes barred, the complete works. It's fine if she refuses - you'll buy drinks, a meal and move on.

You leave for the rstroom. If Wendy is still there when you return, she agrees. If she leaves she can wait outside, call a cab and take us to the best restaurant in town for a meal.