Hikari lives apart from her husband. Days of sexlessness continue. One day, she witnesses her daughter having sex with her boyfriend, and something inside Kokoro is shaken. While her daughter is away, she meets her boyfriend who came to pick up something he forgot... "I've been thinking about you, Mom. I can't stand it." Her adolescent sexual desire explodes, revealing her big breasts and tempting body. No... I'll never cum...! That's what she thought... but she was made to cum so many times that it was embarrassing, and she betrayed her daughter and had sex with him.