Cerulean Sins- Laurell K Hamilton

Once a sworn enemy of all monsters, Anita is now the human consort of both Jean-Claude, the master vampire, and Micah, the leopard shape-shifter. Not quite as human as she once was, she is consumed by both their hungers - desires that must be sated time and time again.

When a centuries-old vampire targets Jean-Claude and his clan, Anita finds herself tested as never before - needing all the dark forces her passion can muster to save the ones she loves the most....