Aoki, a maternity yoga instructor, approaches a husband during a couple's trial lesson and whispers, "If you join, I'll give you advice on anything." After joining, she seduces her husband in the studio, sneaking around while the wife isn't looking. She sweetly and sadistically stimulates the husband's erogenous zones and makes him cum inside her. On the day of the birth, she goes to his house and squeezes out the semen from the husband who is obsessed with cheating sex...