Having found a job in the countryside, I returned to my hometown and began an exciting period. The biggest change was that my parents remarried and I had a younger sister. Three months ago, after my father was transferred, my sister and I became the only two people in the family. My sister, Hinata, had dropped out of university and had been staying at home, but one summer when the air conditioning broke down, seeing me covered in sweat, her hidden sexual desire erupted, and she suddenly said, "Brother, can I borrow you for a bit!" and pounced on me…