“You are not allowed to cum yet...” Seduced by the sweet senior coworker from his part-time job, he agrees to train his premature ejaculation. At a convenience store, a café, and even the office, her expertly paced handjobs keep making him erupt. When she finally whispers, “Want to have sex?” he cannot resist, and their training naturally turns into fucking. By the end, they are both openly craving each other.