Worried about her son who stays up late every night studying for exams, mother Wako An checks on him one evening and finds him fast asleep from exhaustion. Seeing him, she approaches with concern and notices his groin has naturally become erect from fatigue, lifting the fabric of his pants. Slowly pulling down his underwear, she sees his uncircumcised penis covered with foreskin. Filled with maternal worry, she gently uses her fingers to peel back the skin, revealing a glans swollen with arousal, emitting a sweet scent. Carefully and tenderly, she licks away the accumulated smegma with her tongue, bringing him pleasure. The mother's affection begins to soothe her son's weary heart...