Y/n, a shy university student, takes on the role of babysitter for Jungkook and Kit's twin sons during her break. Kit, being bisexual, proposes the idea of inviting a third person to experiment with their sex life, convinced of their strong relationship. Y/n hesitantly agrees, overly excited for the experience. However, what happens when the situation takes an unexpected turn when Kit becomes upset in the middle of their threesome, leading to Kit humiliating Y/n, leaving her feeling bewildered and emotionally conflicted.