Due to her mother's remarriage, she ends up with a stepbrother over 20 years older than her. He's gross, a NEET, and the worst kind of person. One day, she's suddenly overwhelmed by an intense heat and uncontrollable urges she's never felt before. It turns out she was drugged with an aphrodisiac, causing her to black out and be forcibly penetrated by his drug-laced cock. The pleasure exceeds anything she could imagine—despite hating him, his cock feels unbelievably good. Gradually trained by his aphrodisiac dick, she squirts repeatedly, climaxing over and over. She becomes a glitched-out sex slave, a dedicated cumdump for her stepbrother, violated again and again.