Tragedy when introducing Hikari Sena's wife to his brother

Tragedy when introducing Hikari Sena's wife to his brother: Hirari Sena's husband introduced his wife to his cousin who worked far away and only came home once for a long time. From that day on, they began to maintain close relationship with each other. They both seem to have something in common: they like to make love and their needs are extremely strong. Then they secretly have sex with each other right at home. Sometimes the husband is still at home and they still fuck each other as if it were a matter of business. Normal. The story is very dramatic, please join us to see the ending!!