The first time my brother’s girlfriend stays over, she catches me masturbating in my room and sees my hard cock. From then on, whenever my brother is not looking, she turns her huge ass toward me and makes it obvious that she wants to fuck. At first I think I have simply gotten lucky, but her sex drive keeps escalating. Behind my brother’s back, I repeatedly pound his girlfriend from behind, make her cum again and again, and finally get permission to finish inside her.