[Kouzuki Rio] Gimai (imou to) o tometa dakenanoni

An anxious sister bursts in with a suitcase, begging to stay over while her brother-in-law's marriage is crumbling. Her supportive older sister welcomes her, they share a drink, and the tension spikes as the sister, flaunting her generous bust, invites the desperate husband into an illicit encounter. The narrative climaxes with a raw, explicit tryst that epitomizes the cheating theme, leaving the characters entwined in a forbidden, passionate moment.