Just Good Friends (Friends & Acquaintances #1)
Jennifer Denys

Then, at one of their discussions, Sam stuns Jessie by suggesting they try out for real a scenario they are reading. Not having had a lover for fifteen years but intrigued to see where this will go, she agrees. So they begin to investigate various aspects that appear in the books, such as bondage, spanking, sex toys, etc.—not always with the same effect the author intended. Some laughs ensue, some tears, and lots of improvisation.
As they continue their explorations, Sam relishes his role as the dominant sexual while Jessie gains confidence in her sexuality. Soon, they realize they are more than just good friends.