It's Almost Been 5 Years Since This Horny Father-In-Law Started Sexual Relations With A Son's Wife Iroha Natsume

Saeharu worked as an accountant at my company. She was beautiful and very intelligent, and I thought she was perfect as a bride for my son. But at the same time, she was also very attractive as a woman. Though I knew it was wrong, I ended up having a physical relationship with her... I thought it would be just once, but it continued for five years. Even after she married my son, she asked me to continue this relationship.