Natural Instincts (Instincts #1)

Andreas Nikandros has one focus, to kill the vampire he believes murdered his sister, and he knows with their greater strength, the surest way to kill a vampire is to become one. As a zoologist, he’s used to looking at the world from a natural standpoint, but when he sets out on a quest to find a vampire to Turn him, what he finds in Titus Antonius Calidus is the last thing he expected.

Titus has lived for over a thousand years, and in that time has only ever given his heart to one man. As they follow their natural instincts, they discover something truly worth living forever for, each other.