GVG-154 My Big Sister’s Real Sex Ed Hikaru Konno

One day, older sister Hikaru and younger brother Tomoki discover their father’s adult DVD. Tomoki, who is ignorant about sex, talks about DVDs in front of his mother, causing a rift in the family. Taking this opportunity, Hikaru decides to teach Tomoki about sexual knowledge with his own body, but eventually Hikaru develops a feeling that is different from education…