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

Hiroyuki was suddenly visited by her sister-in-law Yui. My wife went on a two-day trip with a friend, and I thought she would be able to enjoy herself alone for the first time in a while...but the intercom rang out mercilessly and Yui came into the house. Hiroyuki was surprised, but was completely bonded to Yui, who took on all the housework. I can't believe that my true purpose is to relieve sexual desire... Yui sends off Hiroyuki off with a seductive smile as she goes to take a bath, and begins to take off her clothes herself...