There is a site about it on JoyOfSatan, under Demons, then click on Incubi and Succubi! I myself am working with my demoness lover Ezathy...I have only known her for...Say a week today actually. In a nutshell, you do a ritual to Father Satan asking for a demoness lover, stating your needs (Sexual relationship, loving relationship, or both, or simple an open sexual relationship where you have no jealousy. Then, she will most likely come to you when you are in bed...You should get a picture of her, and if you dont you can think of a temporary one for her. Then, every night, you masturbate to that picture...Fantasing you're having intercourse with her. Trust me, it's been much more pleasurable since last thursday. I hope I helped!
HAIL SATAN!