Kindergarten (1989)

Middle aged couple Graciela and Arturo operate a kindergarten in their mansion. They live with Graciela's wheelchair bound widowed mother, Luisa. Graciela is particularly keen on one boy, Luciano, on whom she makes sexual advances. As time progresses, the relationship between Graciela and Arturo tenses. Scenes show them celebrating kids' birthdays while having sex in hiding, practicing a ritualistic burning of a wrecked car, mistreating their comatose grandfather (victim of said car wreck) and generally torturing Luciano.