Yuna, a wife who lives a mediocre life with her husband. One day, when I was home alone, I was raped by a delivery company. Yuna didn't understand what happened, only knowing the feeling of pleasure when being pushed down right at the entrance, silently lowering her panties and inserting a hard cock into her. At that time, Masahiro, my husband's brother, came home. Looking at Masahiro who was full of energy in contrast to her husband, Yuna wanted to have sex immediately, where only the fierce piston like a beast was repeated again.