NMSL-026 Plain Glasses, Gorgeous Big-Busted Older Sister, a Perverted Seductress for Her Younger Brother Only: Hibiki Amemiya

Since their parents were often away from home, the siblings grew up relying on each other and became very close. In particular, the older sister, who had just turned 20, had an unusually strong attachment to her younger brother. Struggling with intense feelings, she spent her days trying to cope while thinking about him. Eventually unable to hold back any longer, the sister uses a love potion on her brother and crosses a line. When he later says he has gotten a girlfriend, her jealousy and desire spiral further, and she continues down a dangerous path.