A moment swirling with a married woman's shame and taboo desire. To fulfill her husband's cuckolding fantasy, K Nayako (26), married for three years and never having been with any man other than her husband, nervously accepts swapping arranged by the organizer of a partner exchange club—agreeing, "just this once." Enduring the man's caresses, she trembles and climaxes when her pussy is licked. Though modest, she emits soft moans each time his cock thrusts into her. Just before reaching orgasm, the pumping stops, leaving her confused—yet once resumed, she's carried again toward climax. Thirty minutes later, in cowgirl position, she confesses, "I want to have sex," and immediately after penetration, gasps for breath, writhing her body as she drowns in pleasure.