Once tormented by sexual addiction, Saeko Matsushita now lives a peaceful, quiet life. But one night, she secretly spies on her daughter and son-in-law's intimate encounter. What she sees is a side of him she never expected—fierce, passionate sex that contrasts sharply with his normally gentle demeanor. In that moment, repressed memories surge back, reigniting her long-buried desires. Seizing the opportunity while her daughter is away, Saeko gives in to temptation, aggressively seducing him before giving in to an intense, forbidden creampie-filled affair.