You have a general dissatisfaction with spouse, work, family, life, etc. You are stuck in a rut and need a thrill. You place a Craig's List posting looking for a Dominant man. I reply and after some correspondence, on an agreed upon date, you are given the number to a hotel room.
This can be fun because the actual craig's list postings can be "first person" going back and forth. The actual meet can change to 3rd person past tense.
It should be short, can be as realistic in desires and wants, and it could be very interesting. It has a defined beginning and end - when you leave the hotel room and go back to life.