GVG-244 Big Sister's Real Sex Education Aisu Shina

Kokoa, who lives happily with her family but hasn't had a girlfriend for a while, feels disgusted when her friend tells her about having sex with her boyfriend. At that time, she is told that her brother has made her first boyfriend. Kokoa teaches her younger brother, who still has little knowledge about sex, how to interact with women, but perhaps because of Kokoa's complicated feelings, her story goes in a radical direction...