During a rare long weekend visit home between work assignments, daughter-in-law Emi warmly welcomes her son-in-law with a smile, preparing his favorite family dishes to create a cozy atmosphere. The son-in-law steps away briefly, leaving mother and daughter to enjoy a private moment together. The mother mentions how much she misses her grandchild, but the daughter confesses she loves her husband yet has no desire for sex, angrily getting up and leaving. The next day, Emi heads to the bedroom to ask her son-in-law for help, only to catch him masturbating. Feeling a twinge of sympathy, Emi begins assisting him. Touching his erect cock excites her, and soon both are caught up in pleasure. Yet overwhelmed by guilt toward her daughter, Emi insists the son-in-law keep their encounter a secret, determined to hide their growing intimacy.