Married woman living together lesbian - eldest son's wife, second son's wife

Six months have passed since her husband passed away, and Yuna has to go to her husband's parents' house. At my parents' house, my brother-in-law was on overseas assignment and my sister-in-law, Yuko, lived alone. Yuko greeted Yuna with a smile. A beautiful married woman lives with two people... And that night, Yuko suddenly kissed Yuna. Although Yuna refuses, she becomes aroused by the memory of Yuko's lips. Yuko also had more desires for Yuna. Yes, when Yuko married into this family, her stepmother had given her the pleasure of lesbians...