GVG-305 My Big Sister’s Real Sex Education. Yuma Koda

Yuma, who lost her mother ten years ago, lives with her father and younger brother Domu. One day, Domu has a wet dream. Yuma discovers it by chance and consults with his father, but he is treated lightly, saying, “Leave him alone because he’s a boy.” Yuma decides to give Domu sex education with her own body in order to teach her knowledge of sex.