In the dimly lit room, the brother's hand moves rhythmically, his pajama pants tented by his hard-on. His sister, clad in a silky braga and bombacha, enters, her eyes widening at the sight of his arousal. She hesitates, then joins him, her own hand disappearing beneath her waistband. Their eyes meet, and the room fills with the sounds of their quiet moans and the rustling of fabric. The air is thick with tension and the scent of their arousal. As they approach the edge, she leans in, her breath hot on his ear, whispering, "What if they catch us?" The thrill of the forbidden sends them both over the edge, their bodies convulsing as they find release together.