This is a romantic novel that is supposed to be titillating. A young girl, working as an escort, is set to marry a wealthy man.
The proposition that a brother would seduce his future sister-in-law is a bit of a stretch but that is the least of the stretching to be done. Annabelle is introduced to a variety of kinkiness by Louie, her future brother-in-law in a hotel that is dedicated to historic hookers.
I guess there is a market for books like this, look at the success of Fifty Shades. Personally I found the book boring rather than titillating but I suspect the target market is not retired men but but lovelorn of any age may enjoy it.
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This book may have been received free of charge from a publisher or a publicist. That will NEVER have a bearing on my recommendations.