A shocking story of a 24-year-old part-time worker in a customer service job experiencing her first affair while already having a boyfriend. Moving to the city from the countryside, she wears a clean, dotted dress that enhances her innocent and modest appearance—yet secretly struggles with high sexual desires that her once-a-week encounters with her boyfriend fail to satisfy. Dissatisfied with her current relationship, she makes the taboo choice of cheating for the first time. Contrary to her pure exterior, her submissive side emerges intensely during sex, even showing masochistic tendencies to the point of enjoying near-choking. By the end of the session, she boldly licks cum off fingers and swallows it completely. A powerful fusion of shock and pleasure, capturing her secret first infidelity.