Carlos Simoes and his stepsister Fran are supposed to be studying, but the tension between them is palpable. Carlos' noticeable bulge doesn't help, drawing Fran's gaze away from her books. She tries to focus, but her imagination runs wild, picturing his cock growing harder under his jeans. Carlos, oblivious to her thoughts, continues to explain the lesson, his voice deep and distracting. Their shared glances become charged with unspoken desire, the room heating up with every stolen look.