The Prophecy by Nina Croft

Whoever sacrifices the virgin, Raven Cole, on her twenty-first birthday will achieve a great victory in the war between good and evil.
That’s bad news for Raven. Half-vampire, half witch, and cursed from the moment she was born, Raven has been a prisoner of the fire-demons for the last seven years. Now, as her twenty-first birthday approaches, time is running out.
Kael Hunter believed he would do anything to stop the fire-demons from winning. Until he saw her. Now, rather than kill the alluring vampire himself, Kael has another plan: to prevent the prophecy by taking Raven’s virginity.
But Raven is prepared for death not seduction. Can Kael use their one night of passion to convince her she has a future – and that he should be a part of it?