I need to tell you something. So you know how we haven't had sex in months? Well, your cock just isn't pleasing me any more. I have to fake orgasm and you bore me in bed. I told our son about it, and I was thinking of divorcing you, but our son came up with a better idea. We have been fucking for a few months now, and its amazing. His cock spreads my pussy so wide, and he makes me cum so hard. Im fed up of sneaking around and hiding it from you. You're going to watch as your son fuck his mummy, and you watch. I'll show you what a good cock should look like. I suck his big cock, then let him fuck me till I cum. To finish him off, I wank him until he spunks all over mummys tits. He has so much more cum than you do.