Recently, I was secretly releasing my sexual desire by watching a certain training video without my wife knowing, but she found out... But instead of getting angry, my wife seemed to like the video very much, and we signed up for personal training. The trainer was Yui, and she was very kind instructing us, but she was strangely close to me, and I couldn't stop beating my heart. Then, when my wife went out to take a shower, she secretly suggested a private lesson...