The Duke I Tempted

(3.5, rounding down.) This was quite a bit angrier/angstier than most of the historicals I read, and it was almost unpleasant at times - while I ended up enjoying it, the fights they had were intense and tough to read sometimes. I love a marriage of convenience and all that, but I wish it had been developed a little more why they actually like each other. Also, for a book about a duke who's a member of a secret BDSM club, this was surprisingly light on that aspect?