Sinner's Sacrifice - Sinners Never Die, #2

Yvgeny Breznik, the CEO of a large corporation in New York City, has a laundry list of problems. A micro-managing aunt, a cousin who doesn't know the meaning of the word restraint, and a new employee who occupies far too much of his attention. Samantha Dubets is his onsite medic, and she doesn't know when to stop trying to protect the city's most vulnerable citizens from their own mistakes. It's all he can do to keep her out of trouble and his hands off her. Oh, and he's an eight-hundred-year-old vampire.
One of less than two hundred in the entire world. Over the years, fewer and fewer people have been born with the genetic quirk necessary to become one, which means vampires are on the brink of extinction and desperate to enlarge their numbers. Samantha's blood reveals that she has the best chance of becoming a vampire of any human in a couple centuries. As a result, old alliances, treaties, and promises are tossed aside for the chance to take her.
Other vampires want her to have children, as many as possible, then change her. But none of them are going to ask nicely. Yvgeny isn't going to allow any of them to touch her because she belongs to him. Samantha, however, has other plans.