Fantasies (1981)

16-year old Anastasia lives on a lush Greek island with their pervy grandfather and dreams about having a large antique bathtub. She begins to have feelings about her brother Damir, who returns home after years abroad and dreams about running a sea-side resort. Falling under the island's erotic spell, the girl and boy discover that their love goes beyond filial. Her confusion causes her to seek advise of her aunt and her grandfather. She must decide if she is in love enough to marry and continue living with her brother in a different way. The incestuous nature of the story evaporates when it is discovered that the two aren't actually related after all because he was adopted.