[Big-breasted wife falls into the pleasure of raw sex through wife swapping] Fumika, a young wife, is feeling lonely as the passion between her and her husband has cooled since the early days of their marriage. One day, she receives an invitation from a married couple who are friends of hers to swap partners. As long as she uses a condom, sex doesn't count as cheating... her free-spirited friend persuades her to start having an affair. At night, Fumika is moved by a cock that is better than her husband's. Even though the condom breaks with his strong hip thrusts, the pleasure and immorality make her even more excited! She is driven crazy by the follow-up piston-like thrusts after the creampie, and she becomes addicted to true cheating sex...