I'm jerking my cock to the sight of my wife, the mother of my son, getting railed by him. She's on her stomach on the bed, face buried in a pillow, and my son is mounting her from behind. She's completely naked, her legs spread wide so that his hips can thrust between them. She's not looking at him; instead, she's staring at her phone screen on the bed next to her. Her phone screen glows bright enough to illuminate her entire body, lighting up her pale skin in a soft blue light. She looks absolutely beautiful lying there, being used by her own son. Her body is soft and round in all the right places, making her an ideal target for my son's cock. I watch as it moves in and out of her tight cunt, leaving trails of cum behind. It's a good thing she doesn't need to worry about getting pregnant; if he were fucking anyone else, there would be no way she'd let him do it without protection. My hand strokes faster along my shaft, imagining how amazing it must feel to be inside her warm pussy. My son has always loved using his mother like this. He knows that he can stick his dick in her any time he feels the urge, and he won't get any complaints from me or her. We've conditioned ourselves to just accept this fact and embrace it as part of our lives. And honestly, what could be more exciting than watching your son fuck the hell out of your wife? There's no way we're going to let this opportunity pass our family up.