Darkest at dawn - Christine Feehan

'Dark Hunger' -
Juliette is a beautiful activist devoted to the liberation of animals confined in a foul and humid jungle lab. But then she stumbles upon an unexpected prisoner unlike any she's ever seen. Or touched. Riordan De La Cruz, an immortal Carpathian male, is trapped and caged, his desire for revenge only beginning. She will release him from his bonds. He will release her from her inhibitions. Both have voracious appetites that must be sated.

'Dark Secret' -
Rafael De La Cruz has spent centuries hunting vampires, but now he's following the scent of a human. Colby Jansen is a rancher and the sole guardian of her younger half siblings. She is prepared to protect them with her life against Rafael's blood claim. But the arrogant and fiercely sensual Rafael is after more than her family - he wants Colby. And there's nothing she can do to stop his raw desire to possess her.