Kotaro deeply adored his girlfriend, cherishing their sweet yet bittersweet days together. However, she already had another man—her company's boss—who subjected her to strict training and dominated her completely. One day, Kotaro gave her a soothing oil massage after she returned home exhausted. As she gently fell asleep, he couldn't resist slipping his cock into her from behind. Caught in that impulsive moment, she mischievously decided on punishment: a 3P with her boss. In that instant, Kotaro lost all control, his heart utterly enslaved by her.