Hellbent on revenge, Vincent, the step-son, plays innocent student for Hello Siri3, his step-sister and teacher. In her classroom, she's oblivious to his intentions, marking papers while he watches her petite frame, skinny legs crossed. He starts, asking about 'extra credit,' his voice laced with innuendo. She looks up, noticing his gaze, realizing his game. Yet, intrigued, she plays along, their roles reversing as she becomes the student, learning the taboo desires of her step-brother.