Daisuke, who had just reached puberty, was obsessed with his mother Akari's lips. He wanted to devour those soft, plump lips. What would a first kiss taste like? To celebrate Daisuke's sexual awakening, Akari decided to teach him how to do it. They slowly kiss, their tongues touching. They lick around the sensitive insides of each other's mouths, exchanging saliva. As they continue to passionately kiss, Akari's erotic switch is flipped on, and he is at the mercy of her experienced, super tongue technique.