Lust's Shadow — Kate Hill

Apprenticed to a mysterious man of dangerous appetites, Livia finds it hard to ignore the allure of a man whose dark, tortured soul unnerves her as much as it attracts her.

Perrin, tainted by Fiendgen blood, spends his life isolated, protecting Guthdry from utter devastation. But the time has come to train an apprentice. Unfortunately for both of them, no matter how hard he struggles against his dark desires, Livia is a temptation he doesn't really want to resist.