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This one has a "heat index" of 4 and the genre is erotica.
Book Description
Seth Anderson and Isabella Carnetti have been best friends since grade school. They live and work next to each other and are content with the status quo until the day that Seth realizes that Isabella is a desirable woman. She is leery of a relationship with him especially when she finds out he’s into tying up his lovers. He won’t rest until he has her in his bed. Then his ex shows up wanting to win him back. Can Seth and Bella have a relationship or will Seth’s ex be enough to tear them apart?