In a cramped, dimly lit room, a sister and brother face off, their hearts pounding. She's caught him off guard, his tiny cock tenting his shorts. 'Yep, it's my tiny cock?' she taunts, her voice barely above a whisper. He swallows hard, his body betraying him as she inches closer, her eyes gleaming with a mix of curiosity and desire. 'Let's find out just how tiny it is...'