One day, Kyoka (Nanami Misaki) witnesses her boss's twisted sexual habits and is raped to keep her quiet. He relentlessly rapes her with his huge cock and says, "I'll use my pre-cum to smear it on your lips as lip gloss," leaving semen marking her lips. It's a sexual habit that makes her want to die, but as he continues to rape her, she gradually starts to feel it and is made to cum again and again. "You were cumming so much, Yamazaki-kun," says Kyoka, who has a sensitive body, and her perverted boss. As she lives through these humiliating days, her body becomes unable to live without her boss's huge cock...