Hitomi is married to a man who has a child from a previous marriage. One day, when her stepson Yuichi doesn't come out of his room, she becomes worried and calls out to him, only to find that he is masturbating in VR. Hitomi, who hasn't had sex in a while, is unable to suppress her daily frustrations at his hard, erect penis and begins masturbating in front of him... Then, Yuichi, who notices Hitomi's lewd behavior, asks her to take his virginity. Unable to contain her physical excitement, Hitomi tells herself, "This is just practice," and takes his penis in her hand...