Erika Arimura, a sexually voracious younger sister who's going to school in the spring, makes love in her brother's room for three days before moving. (MUDR-107)

My parents were away at a religious ceremony, and after a long separation, I was alone with my younger sister… Seeing her defenseless state was too much for me, so I forcibly assaulted her, only to discover that her libido was even stronger than the average person's…