Needing money to support her family and siblings, she stumbled upon a high-paying, student-friendly underground job on SNS. She thought it was just a simple massage job in uniform, but things took a dark turn when a lecherous teacher, whom she despised, walked in. While giving him a massage with a mask and a changed voice, she was suddenly exposed, leaving her vulnerable. With her school life, family, and living expenses held hostage, she was forced into illegal deep-throat procedures despite the clinic's supposed legitimacy. A throbbing, erect cock was relentlessly rammed inside her, leaving her with no choice but to endure. Despite her resistance, she couldn't help but climax under the intense thrusts. She ended up having sex everywhere, both at school and at the clinic, becoming the exclusive sex slave of the harassing teacher. She felt guilty towards her mother and siblings waiting at home, but the teacher's exceptional skills and the sheer pleasure of sex made her fall deep into the abyss of hedonism. The innocent schoolgirl had unknowingly become a fallen woman... .