Details

Takashi and his wife Kanon are in their second year of marriage. They want children, and they are doing "pregnancy activity" in which Takashi abstinence for a month so that they can produce healthy sperm at the time just before the day of ovulation, which is easy to get pregnant. On the other hand, Kanon's older sister Megumi usually travels around the country as a CA, and it was difficult to make children with her husband. Megumi, who wants a child before her sister, comes to seduce Takashi when the younger sister's couple's scheduled child-making date approaches, and takes away the sperm that they have accumulated.