Every day, his brother-in-law, an unemployed man with a perverted hobby, peeks at his brother-in-law's busty wife, Sana, who just got married. On a hot, sleepless summer night, the brother-in-law is unable to contain his excitement at the sight of her sleeping, covered in sweat, and finally attacks her while she is asleep. Despite her resistance, her brother-in-law, who has too much sexual desire, continues to thrust his powerful penis into her without rest, and she becomes drowning in the pleasure she has never experienced before, and one day she will begin to desire her brother-in-law herself...