The reserved and shy stepson's mother, "NAO," is delighted that he has found a girlfriend. However, as she watches him struggle with how to close the distance with her and how to have sex, she feels compelled to teach him various things. And so, she imparts the knowledge of a woman's body and sex in a deflowering FUCK! As they continue to meet every day for their adorable stepson's sake, the two of them will eventually...!