In around six hours from now my wife of four years, will be going to work and I'll be welcoming her beautiful twenty six year old daughter Penny, into our home. My step daughter will be with her two year old son, and they'll both be staying over.
Putting the little one to bed after no doubt hours of play, Penny and I will then have as much sex as I can give her. She truly is a nymphomaniac and absolutely loves anal sex. Her husband, and he admits this, simply cannot match her sexual needs, so every Saturday night (And other occasions when time allows) with my wife's night shift starting, myself and Penny get down to serious cock sucking, pussy licking, ass tonguing and me fucking both of her sweet holes.
It's a sexual arrangement that both Penny's mom and husband know nothing about (I think). It helps Penny's husband is on call most weekends, and that I have a similar libido to my step daughter, plus a large cock she adores.
And it also means I get to see my son too. My wife and Penny's husband don't know that little detail either, yet Penny and I did a paternity test, and I'm definitely the father.