Satan Was a Lady

Satan Was a Lady (1975) is a horror directed by Doris Wishman rated 4.8/10.

Large-breasted Terry has an affair with Victor, fiancé of her sister Claudia. However, Victor isn't quite the wronged fiancé, as it turns out that he's having an affair with a hot young thing. Further, Ada–Terry's mother and Claudia's stepmother–has a plan to terrorise Claudia out of her inheritance.