Keeping It A Secret From My Husband, I Asked My Father-In-Law To Get Me Pregnant. Kana Morisawa.

The Morisawa family lives happily together: the wife, husband, and father-in-law. However, troubled by their inability to have children, the wife consulted her father-in-law. He couldn't find an answer either, but thinking that since the husband has many siblings, the father-in-law's sperm might be strong, the wife asked him to inseminate her. At first she intended it to be businesslike, but gradually she became engrossed in sex with her father-in-law. They had a promise to end the relationship once she got pregnant, and when the pregnancy was confirmed, their relationship ended. But after childbirth, unable to hold back any longer, the two resumed their insemination intercourse...