"I like the pine needle position. That shape penetrates the deepest and stimulates the portio."Rieko Masaki, 48, is a full-time housewife. She has been married for 26 years this year and has a family of five with her husband and three children. Their relationship is still good, and they have sex once or twice a week, but Rieko seems not to be satisfied at all. "Maybe he doesn't mean it, but sex with my husband is like a regular ritual to confirm our relationship... We don't have that hot feeling of, "Today we're going to feel really good!" Maybe it's just that we've gotten older..." The quality of sex has clearly changed since we first met. "I still remember how good it felt when I first had a vaginal orgasm." I want to drown in pleasure like the day I first discovered true joy. With this thought in my heart, Rieko begins her first affair.