I am Sayuri Sato, 40 years old. I've been married to my husband for 12 years now. We have no children and live as a couple. Around that time, about a month ago, my sister started living with us. Unlike me, my free-spirited sister walks around naked in front of my husband, messing up our daily rhythm. Lately, I've felt like my sister and husband are getting closer. Just then, I heard my sister's lewd voice coming from the room…
