One day, my father remarried. - The other party's stepchild 'Chiharu' came to the house as a sister-in-law. - One day, my parents went out. - Alone with Chiharu. - The two of them are more aware of each other than usual. - And without any conversation, they desire each other's bodies in silence. - From that day on, my sister and I began a relationship in which ``as soon as we saw each other, we silently sought each other's bodies.''
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