Garden of the Incubus is a novel written by John Tigges. It was first published in 1982.
Description[]
When innocent young Roberta entered the convent at St. Paul's,
she seemed content with her life of chastity and devotion...until a mysterious voice called out to her.
"YOU BELONG TO THE MASTER AND NO ONE ELSE!"
From that moment of satanic confrontation she was powerless to resist the voice that controlled her every action, until she was ultimately filled with an unquenchable lust for a demon from the depths of hell.