This is now one of my favorite 'shifter' universes because it's relatively unique in its treatment. Werecat viruses are transmittable in several different strains (depends on the type of cat that bites you, of course) and for a week a month, at the peak of the individual's strain of the virus, each shifter is plagued by the shifts, completely losing their human side to the exceptionally painful process. 
 The werecat viruses infect a good-sized chunk of the population - enough to the point that the populace knows about them and special accommodations have to be made by society to handle the werecats. There's a "kitty crimes" special task force within the Police department, for example. 
 The main couple, Roan and Paris, are two different strains of the virus. So they get to deal with the prejudices of being gay and being cats. Each has his own personal demons he is struggling with. They lean on each other in a variety of ways, and getting to know their characters is truly a treat. 
 FYI: Infected and Prey are separate stories.