Fumika is a lonely, big-titted young wife whose marriage has lost its early passion. When a free-spirited couple invites her and her husband to swap partners, she agrees under one rule: sex with a condom does not count as cheating. Another man’s superior cock soon wins her over, and his forceful thrusting tears the condom. Instead of stopping, the danger excites her even more. He pounds faster to cover it up, creampies her, then keeps thrusting until she loses herself in repeated orgasms and genuine infidelity.