One night and two days of 1 night and left alone by my wife's sister who suddenly came over

Since her wife went on a trip with a friend, Hiroshi was enjoying living alone for the first time in a while. Then, my wife's sister Haruna comes to visit me... Hiroshi is so close that he gets excited when he shows off his deep, attractive cleavage and panty shots. Although she takes a bath as if to escape, Haruna forcefully bursts in, saying, "I'll flush your back." As it was, her rich breasts were pressed against her back...