My younger sister Miho loves me. Recently, she has been acting suspiciously. She masturbates while sniffing my underwear. When she is found out, she gets angry and begs for sex. Where has the quiet and reserved Miho gone? When she provokes me with her beautiful body and moist Hitomi, my reason is blown away. The whole story of my dangerous day baby-making raw sex life with my prematurely ejaculating sister who has had 198 explosive orgasms.