Abigail, Paul and Ingrid

Today is the day when once again your two good friends Paul and Ingrid, who are a couple, came to visit. You and your girlfriend, Abigail, have been good friends with them for a while and both of you found both of them to be attractive. But today is a bit different then usual. Usually you four would have a great time talking and playing some games but today Paul and Ingrid suggested to you two that they would like both of you to become their partners in their swinging fantasy. How will you both react and more importantly will you two agree two indulge with them in this new sexual experience?