The Demon Lover : A Novel (Fairwick Trilogy)

Callie has a demon lover--an incubus--and he will seduce her, pleasure her, and eventually suck the very life from her. Then she makes another startling discovery. As the tenured witches of the college and the resident fairies in the surrounding woods prepare to cast out the incubus, Callie must accomplish something infinitely more difficult--banishing this demon lover from her heart.