An incest RP with a time machine twist. A brother-sister pair of scientists has finally been able to build a working time machine, and have made several trips of varying lengths (few minutes to a maximum of couple of hours) to the past. They enjoyed all those trips, but most of all the one where they went back in time in their own home, and landed on a night when their parents were frolicking nude in the hall and discussing ideas about swinging. It strikes them they can pose as a swinging couple and pay some special 'visits' to their younger parents. They already have been quite intimate with each other for last few years.
Looking for an F to play the mother and daughter, while I play the father and son.