This role-play is performed by adults. My wife will give birth next week. However, in this day and age, it was difficult to return home to give birth, so my husband and I decided to stay at my sister-in-law's house who lived nearby. My sister-in-law is kind and beautiful enough to be a waste to my brother. ...He looked happy. But the reality was different. My sister-in-law, who is unable to have children no matter how long she waits, had her brother take a test and found out that he had azoospermia. When I witnessed my sister-in-law's despair, I became lustful...