"I like tribadism. That shape penetrates the deepest and stimulates my portio." Rieko Masaki, 48 years old, full-time housewife. A five-person family with her husband, who will be married for the 26th year this year, and three children. Their marital relationship is currently good, and they seem to have nightly activities 1 or 2 times a week, but Rieko-san doesn't seem to be satisfied at all. "He may not mean it that way, but sex with my husband is like a regular ritual to confirm our marital relationship... There's no passion between us that says 'We're going to feel good today!' It might just be that we've gotten older..." The quality of sex has clearly changed from when we first met. "I still remember the feeling of the first time I had vaginal sex." I want to be intoxicated with pleasure like the day I first knew true joy. With such feelings in her heart, Rieko-san's first cheating experience begins.