When I was a student, my father decided to remarry. My new mother had a daughter younger than me named Miyu. Unlike me, who had few friends and spoke little, Miyu naturally approached me. She was pure, bright, kind-hearted, cute, and had a feminine figure that gradually captivated my heart. One day, my parents decided to go on a slightly delayed honeymoon, leaving Miyu and me alone together for several days. I never imagined it would turn out like that…
