One day, Sanae witnesses her son, whom she has a crush on, masturbating. She thinks it's inevitable because he's at that age, but her son is masturbating while using Sanae as a stimulant... Watching this, Sanae finds herself sucking her son's rock hard cock hard, licking his balls lovingly, and fantasizing about leading him to ejaculation. And her fantasies escalate with each passing day, until Sanae can no Sanae suppress her desire to have sex with her son and have him pour his hot semen into her vagina...