Kisses Like A Devil — Diane Whiteside

His wicked desire could free her...
Strikingly handsome, wealthy, and accomplished, Brian Donovan has succeeded in everything he puts his mind to--except marriage. Now, as a favor to his former military commander Teddy Roosevelt, Brian is investigating a powerful new weapon invented in the small European country of Eisengau. The task carries prestige, danger, and an enticing complication in the lithe form of Meredith Duncan. With her deliciously candid approach to all things sensual, Meredith is unlike any woman Brian has known. In fact, she wants him to ruin her reputation--and Brian eagerly obliges, initiating a passionate, playful, and wildly erotic affair...

Or enslave her...
A feminist who believes in free love, Meredith has always battled convention. When her parents urge her toward an odious marriage, Meredith turns to the dashing, thoroughly masculine American who could be her only hope of escape. But nothing is as simple as it seems, and as competition to acquire the new weapon turns deadly, two lovers are drawn into a treacherous game where the stakes run as high as their raw, mutual desire, and the greatest risk of all may lie within an untested and all-consuming love...