Although I was living a happy life with my beloved wife, Hinatako, I had a serious flaw. My husband and I had always dreamed of having a child, but we were confronted with the reality of my impotence. I confessed to my brother about the pain of not being able to ejaculate no matter what. He then muttered with a fearless look on his face, "Do you know about brood parasitism?" The only thing left for me to do was to cling to my brother, who has the same blood type as me, so I decided to entrust Hinatako to him for just one day. However, although I had asked for it to be just once, the two of us ended up having sex over and over again...