My once loving and kind sister changed after becoming a college student, always coming home late at night. One day, I followed her and found her in a party room of an apartment, having wild sex with multiple men. Unable to watch, I tried to take her back, but was caught instead. My sister, drugged and unaware of my presence, attacked my cock with glazed eyes and devoured it. We ended up having incestuous sex, and I even came inside her.