The girlfriend rents a bondage flick. They watch it and she talks him into trying it, but they have two unexpected visitors... and unexpected complications!
An adult brother and sister (with flashbacks to their teen years) and his two teen daughters and their life together, swinging with neighbors, until they come to realize that they are more than just brother and sister. Note there is bisexual male/male sex and some watersports.
Jenna's and her younger brother, Joey's, love is so deep and hot that their mother easily figures out what's going on between them. But no one imagined how much she loved to watch.