JAV48

The Kobayashi family, consisting of a wife, husband, and father-in-law, live together happily. However, they are troubled by the fact that they are unable to have children. The wife thinks that her husband has many siblings and that her father-in-law's sperm may be strong, so she asks him for a seed. At first, she starts out just doing her job, but gradually she finds herself getting more and more involved in having sex with her father-in-law. When she finds out she is pregnant, their relationship comes to an end, but after the baby is born, they finally lose their patience and start having intercourse again...