Saki moans seductively as she masturbates. Caught off guard by the obscene sight, Kazuya is shocked, confused, and aroused. Among the whirlwind of emotions, what truly shook Kazuya was Saki's lonely expression. "Mom, you're lonely..." Tonight, Dad is away. Only he can satisfy her. Seeing Saki in ecstasy, Kazuya makes up his mind to cross the forbidden line.