i went out to my friend's sister, nakaoka tamaki.

Tamaki, Yosuke's older sister who has been provoking in an erotic fashion since ancient times. After a long time, I went to Yosuke's house and accidentally witnessed my brother and sister who were processing sex after the incident in Yosuke's room. Amazing Kazuya, who has become known for her relationship with her younger brother, begins masturbating in a room knowing that she is being peeked at by Kazuya. Kazuya, who showed off such an older sister and was immersed in the bath while refreshingly. At last, the party appears. what about kazuya before the explosion?