Gaku, a father-son family, had a secret longing for his friend's mother, Yuka. And before you know it, that feeling turns into love ... At that time, Gaku felt the awakening of sex in the foolery he happened to witness, but he spent a time in agony because he didn't know how to vent. Yuka, who knew his troubles, secretly gave him a guide ... Then, Gaku, who can not suppress her reason for the stimulation she feels for the first time, attacks her too much. Yuka, who continues to be squid by his meat stick that rhythms violently like a beast, can't hold back.