Vivien Dean 
Enthralled in Silver [EPUB ebook] 

For over half a century, lovers Seth and Simon have been trapped in service to one of the most dangerous vampires on the West Coast. When they discover there’s a way to break the spell that binds them, getting free becomes their only desire.Until they meet Claire, the granddaughter of the mage who enslaved them. Suddenly, seducing her seems like a much more pleasurable alternative. If they can convince her to use the magic she inherited, everybody wins.All they have to do is survive long enough to make it happen.