Resolve and Retribution: Book One of the R/R Trilogy by Michael W. Holman

Any relationship takes work, but that especially applies when an ordinary guy from America's Pacific Northwest is romantically involved with a beautiful former English noblewoman who was turned into a vampire in the 17th century.  Despite all the challenges (and some of those involve other vampires who want Ben gone or turned himself) the paranormal couple adapt as he ages.  Tabitha loves him dearly, even when he can't resist the temptation to tweak her nose while he says "Beep."