I tried for a month to try to get pregnant with my wife and I saved up... My wife's sister is seducing my sperm with her big nipples without a bra, as she can't have sex due to work schedules.

Takashi and his wife Kanon are in their second year of marriage. They wanted children, and they were trying to "find" in which Takashi abstains for a month so that he can produce healthy sperm just before the day of ovulation, where he is likely to become pregnant. Meanwhile, Canon's older sister Megumi usually travels around the country as a flight attendant, and has been unable to have a baby with her husband. Megumi, who wants to have children before her younger sister, comes to seduce Takashi as the expected date for her younger sister and her husband is approaching, and she takes away the sperm she's had accumulated.