Covet (London Vampires Series Book 1) by Felicity Heaton

Vampire Javier knows better than to succumb to his hunger for Lilah. The mortal female belongs to a powerful aristocrat patron of Vampirerotique, the theatre he runs. A single touch is all it would take to break sacred law, sentencing himself to death, but his passion for her has become too fierce to ignore—he will risk everything to make Lilah his.