In a dimly lit Spanish villa, a curious sister, captivated by her brother's recent growth, sneaks into his room. She finds him sleeping, his muscular form barely contained by his boxers. Her heart races as she gently traces his abs, then lower, feeling his thickness. He stirs, catching her hand, but she's undeterred. She leans in, her breath hot on his ear, "Let me, brother." He hesitates, then surrenders, his cock growing hard in her grasp.