Heads up: As it says in the product description, the Silken Edge series is light on the bdsm/kink, but it's mentioned so not to offend those who aren't interested.
Mona and Steven thought they were satisfied with their relationship but as they explore the world of BDSM, Steven begins having problems. Mona believes him to still be pining after his ex-girlfriend, but Steven knows that his feelings for Mona are real, unlike what he had before.
It takes friends of theirs to force them to face their issues, and not in the way they had thought. Will they be able to adapt or is the relationship doomed? Maybe it will take someone else to show them what they're missing.