After quitting a job at a toxic company and becoming a shut-in, Honami Hazuki's son finds himself living at home. His parents' marriage had become sexless, but one day Honami decides to reignite the spark, surprising her husband with seductive lingerie and passionately resuming their intimate life. Unseen, her son watches them through a crack, growing increasingly frustrated yet undeniably aroused by the sight of his mother's body. The next day, while her husband is away, she showers, unaware that her son is spying again—his arousal reaching the breaking point. After stepping out of the bath, she notices her son acting strangely, his demeanor completely different. Before she can react, he confesses, "Mom, I can't hold back anymore," and forcefully takes her.