【Agondo】My brother-in-law is an a-hole brother! The Tuna Sister’s Training Diary, Volume 4

This is the story of a young man who comes to Tokyo to train his tanned sister. After a year of unsuccessful attempts, Keiichi is accepted to a university in Tokyo. It’s a great way to get to know the people around you. But that’s when he discovers that his brother-in-law Kazuya, a successful model, is a sex addict. His sister, Chihiro, knows about it, but can do nothing about it. Keiichi, who can’t stand the sight of her, decides to use his big dick to train Chihiro, who is not good at sex, and make Kazuya fall in love with his wife! Unable to have sex with the girls he left behind in the countryside, Keiichi satisfies himself by tasting his own sister’s body, while steadily training her. Chihiro is getting better and better thanks to his efforts. However, Kazuya still has a secret! What is the sex life of a popular model? What is the future of this new life full of turmoil?

This work has been produced with the cooperation of the original author.