Scent Of A Man. Scentinels, #1

The one woman who can resist him is the only woman he's ever wanted.. Joseph is an Anglian noble living in a harshly religious society where the Council and their clerics enforce chastity, and women are oppressed and treated as chattel. Overnight, Joseph undergoes a rare transformation and becomes a Scentinel, a man who exudes powerful sexual pheromones that make him irresistible to females. His people believe he is evil and will execute him on sight.
He's on the run, starving and desperate. He has nothing more to lose - or so he believes. Liliana is a "morally corrupt" Europan woman with an agenda. She's a creature even rarer than Joseph, a Null who can neutralize Scentinel pheromones. Her mission is to do whatever it takes to bring Joseph safely to Europan shores. There, he'll join Empress Vashti's elite band of Scentinel spies - provided he survives his training with his sanity intact, and learns how to suppress his pheromones at will.
And falling in love with the man she must ultimately betray was never part of Liliana's plan.