A woman suddenly sees a man's penis at a hot spring, during a nude drawing session, during treatment at the dentist, or during a massage. She bashfully tries to look away, but her eyes are drawn to the penis that gradually becomes erect, and when it finally becomes fully erect, she stares with excitement and her crotch begins to get wet. And without brushing off the man's hand as he approaches her with his erect penis, the woman gives herself over to him.