Rented a PT gym for her husband and the ending

Wife hired a female gym trainer for her husband and the ending. Recently, feeling that her husband was not feeling well, the wife encouraged him to exercise. They sat watching TV and saw an advertisement for gym trainer Hibiki Ohtsuki, so they both decided to hire her. The next day they had their first workout at home. When the wife felt tired from exercising too much so she went to rest, the husband and Hibiki started to get suspicious. What a foolish and pitiful wife, Hibiki and her husband made love all afternoon.