GVG-445 — Big Sister's Real Sex Education Yuuna Himekawa

Recently, her younger brother has started looking at her father's pornographic magazines and peeking at her mother's masturbation. Unable to bear it any longer, Yuuna, his older sister, scolds her brother, but ends up feeling sorry for him because he only has incorrect sexual knowledge. She begins to teach her younger brother about sex, bashfully spreading her genitals and telling him, "It's really just our little secret."