For Love of Evil (Incarnations of Immortality #6)
Author: Piers Anthony
Desc: The Man Who Would Be Satan Parry was a gifted musician and an apprentice in the arts of White Magic. But his life of sweet promise went disastrously awry following the sudden violent death of his beloved Jolie. Led down the twisted path of wickedness and depravity by Lilah the harlot demoness Parry thrived--first as a sorcerer then as a monk and finally as a feared inquisitor. But it wasn't until his mortal flame was extinguished that Parry found his true calling--as the Incarnation of Evil. And at the gates of Hell he prepared to wage war on the master himself--Lucifer the dark lord - with dominion over the infernal realms the ultimate prize!