Big break actress Sayuri Shiraishi starring! Younger brother Tatsuya lives with his brother-in-law Sayuri in a house where his older brother is away on a business trip. Sayuri seems to be an excellent mathematician. Tatsuya is training to become a writer. Tatsuya spends a lot of time alone at home and begins to fantasize about the beautiful Sayuri. Sayuri masturbates and provokes. Hot sex with Sayuri. The loving sex of the older brother and his wife is also ○.
