GVG-578 — My Sister's Real Sex Education Hibiki Otsuki

Hibiki lives with her younger brother and father. Hibiki, who cares for her younger brother, warns her AV-obsessed father, saying, "What will happen if your younger brother sees it?" But one day, her younger brother accidentally watches his father's AV. He mistakenly thinks that sex is something scary and comes crying to Hibiki. In order to correct his younger brother's sexual knowledge, Hibiki uses her own body to teach him about real sex...