The boys in the movie are so happy to have their cousins who are extremely lewd. Cousins not only help you clean your room and arrange your belongings neatly, but they are also a great sex tool if you know how to use them properly. Of course, for boys who are addicted to sex like you, it is impossible to ignore. The cousins constantly exposed sensitive areas such as toned buttocks and huge breasts that the brother accidentally saw while the room was only for the two of them. So why incestuous love affairs often take place in Japan, that is too clear in the 3 parts of the movie.