All Things Fair (1995)

In Malmö, Sweden during the Second World War, Stig is a 15-year-old pupil on the verge of adulthood, and Viola is 37 years old and his teacher. He is attracted by her beauty and maturity, and she is drawn to him by his youth and innocence. At the same time, Stig becomes friends with Viola's husband Kjell, who teaches him classical music, and the affair continues, even after Kjell understands that Stig has a relationship with his wife, which Kjell does nothing to prevent. However, Stig and Viola's passionate and forbidden relationship will have consequences they never could have expected.