Grant and Alice have opened their marriage by accepting cash from a close friend of theirs for the pleasure of looking at Alice's body and feeling her. They were planning to allow that in a very controlled way but digital penetration led them over the line and the male friend was encouraged to use his erect penis instead. Still this was only for the purpose of penetration and to feel Alice's body though and the guy was supposed to keep still once inside. Of course that was never going to work and the way has now been lubricated for the full paid sex experience.