Double Fault by Lynn Forest

Becky Franklin is a young commercial actress in a happy and passionate marriage, who spends her free time playing tennis with her friend and neighbor, Toni Simmons. Her idyllic life is interrupted one day when Toni confesses that she has been having an affair, and asks Becky to go with her to the tennis club and be with her as she ends the relationship with the unsuspecting lover.
The plans go out the window when Toni finds that her forbidden lover has brought along a handsome and intriguing young friend, and the well-intentioned Becky finds herself succumbing to the same temptations.
But Toni and her husband agreed to domestic discipline before their marriage, and when everything is revealed, Becky and her husband Patrick must decide if their friends have found the solution to keeping their marriage together as well.
Publishers note: This story contains scenes of the spanking of adult women, sexual activity and marital infidelity. If such content offends you, please do not purchase this story.