A department manager travels out of town with his cute new employee, expecting the trip to remain strictly professional. Then she casually announces that she booked a single shared room. While he is relaxing in the hot spring, she unexpectedly joins him and offers to let him touch her breasts as long as they keep it secret from his wife. The supposedly serious employee reveals her lustful side, and his self-control instantly collapses. Enchanted by her cute face, enormous J-cup body, and sweat-soaked skin, he keeps thrusting hard as she seduces and rides him wet until morning, turning the business trip into the perfect summer affair.