In my friend's house, alone with his sister or younger sibling, feeling aroused by their carefree state despite being in a private room. Unable to resist any longer, I impulsively penetrate them with my fully erect cock from behind! As they struggle to process this unexpected event, they become increasingly captivated by the pleasure of my thick shaft, eventually giving in to their desires and riding me hard while experiencing multiple orgasms! Now that things have escalated like this, maybe I can convince them to ask for more instead of seeing me as the guilty one... Note: Content may vary depending on recording method.