I was living a happy life with my beloved wife, Hinako, but I had a serious flaw. We, a couple who dreamed of having a child, were faced with the impossible truth. I confessed to my brother the pain of not being able to ejaculate. Then, with a fearless look on his face, my brother murmured, ``Do you know what brood eggs are?'' The only option left for me was to cling to my brother, who shares my blood type, so I decided to give Hinako to him for just one day. However, although he had only asked her to do it once, the two of them ended up touching each other over and over again...