Tsubomi visits her husband's family home to pay respects at her mother-in-law's grave. She trusts her kind and considerate father-in-law, but he secretly watches her having sex with her husband. When the two are alone the next day, he claims that he can satisfy her better and rapes her. Tsubomi initially resists, but after her insatiable father-in-law forces her to cum again and again, she becomes addicted to the pleasure.