DarkBite

Born of Lucifer, Saved by Light and sent into a distant future. Katherine Jefferson, Doctor and Scientist grows up to renounce the superstition behind Demons and Devils, but fates not only proves her wrong but leaves her pinning and horny for an Arch Angel, with the Fate of the word on her neck. She either becomes the Guardian who saves the world at a dire cost or she sercrifises her Angel and becomes the Harbinger of Death she was specifically bred for, with the powers to command powers from both heaven and hell! Or die horny.

Sameal, Fifth Arch Angel and the Venom of the source with all his powers finds himself captive at the hands of the very mortal he loathes, but a twist of event threatens to rid him of his Angelic word should he choose not to become one with mortal whose sire is the very being he loathes more...

A must read!!!