When I was nine years old I started to get aroused at watching my younger sister sleep in her panties. We had to share a bedroom and for a brief moment, had to share a twin sized bed. My cock would throb until I gave it relief. After a few weeks of having to resist the temptation of acting on my desires I would finally succumb to my shameful lust of her. After she felt the tip of my hard cock press into her backside she reached back with her hand and grabbed it, stroked it up and down and said “ Oh my lor....., mom wasn’t lying. It’s fat af and long. She got extremely wet all the while because I was fingering both her ass and pussy at the same time she was pulling on my now fully erect cock. We were both about to cum when the door swung open and in came our mom. We both stopped and jumped away from each other as we apologized and said it will never happen again. She then ordered us to “shut our fucking sick little mouths or I’ll have you both locked up for this!” We immediately silenced ourselves as our mother ripped away the blanket exposing our nude bodies in a erotic state together. My fingers were still inside of her and her hands never left my cock the whole time. Damn your dick is bigger than your fathers. And good luck getting that into any girls your age. But your little sister seems up to task. I’m giving you permission to put that into her pussy. The whole thing. All the way until your big balls slam against her ass as you plunge that fat dick into her tight young pussy. And you cannot cum inside of her. She had her first period last month and is very fertile. And besides, nobody wants to explain her getting knocked up. So you can cum inside of me instead.