Innocent Riku-chan's naughty sex education explodes from her brother who is a lolicon! He starts by teaching her how to give a blowjob, but she gets more and more into playing with his dick, making him cum and even drinking his cum... She even makes her brother's friend cum, and it's a mess! Cute Riku-chan even has creampie sex with her brother, and is already addicted to sex.