Innocent high school girl Walnut is trained by a man she met through a dating site out of curiosity. With little knowledge of sex, Walnut accepts the sperm that is released into her vagina without understanding why... She is forced to give a blowjob, which she is not used to, and is taught the cruel sex of adults, making her cum many times. She comes to believe that creampies are a normal act, accepts them on a daily basis, and becomes a sexual slave.