ALDN-005 Tsubaki Kato asked her father-in-law to get pregnant without telling her husband

The Kato family lives happily with the wife, husband, and father-in-law. However, she was worried about not being able to have children and consulted her father-in-law. Her father-in-law also couldn't find an answer, but the daughter-in-law thought that her husband had many brothers and that his father-in-law's sperm was stronger, so she asked her father-in-law to inseminate her. At first I thought it was just a business thing, but I gradually became absorbed in having sex with my stepfather...