A hasty transaction turns into a hurried encounter. The sister, driven by financial need, drops to her knees, her hands shaking slightly as she frees his throbbing erection. She takes him in her mouth, her inexperience evident in her eager, if clumsy, movements. Her lips stretch around his girth, her tongue pressing against the sensitive underside. His hips move involuntarily, pushing deeper into her warm, wet mouth. The sound of their quick, breathy pants fills the small space as they race towards his release.