GVG-078 Older sister's real sex education Urumi Narumi

Tetsuo, the head of the Narumi family, was a strict father, and of course his eldest daughter Urumi and younger brother Maakun were brought up strictly. - One day, Ma-kun, who is starting to become interested in sex, gets scolded when his parents discover an erotic book he borrowed from a friend. - Urumi sympathizes with her younger brother and decides to use her own body to teach Ma-kun about sex...