La máscara (1977)

A mischievous student develops a crush on her female professor in the scandalous Spanish drama La Máscara (1977). Subtitled The Sexual Rebellion of an Adolescent, the film stars Patricia Adriani as Diana, a wayward fifteen-year-old whose bad behavior disrupts life at her straight-laced boarding school. When a well-meaning teacher expresses her concern, the fiendish Diana manages to woo the woman between the sheets of her dormitory-room bed. Their Sapphic experimentation is quite a kinky draw, particularly when it involves nubile Adriani flashing ample portions of skin.