'I can't believe this all happened because I was jealous of Janelle.'The thoughts were scrambled for a while as Sue almost started to cry at the mix o...f her selfishness and the joy she now felt, with his body pressing against hers. Then her thoughts shifted in surprise, and focused on what was happening between her body and Cal's. She felt something pressing between her butt cheeks -- his now hard penis. It felt very sexy and her body began to respond to the stimulation, stiffening her nipples. On top of that, that Saturday John was out on his driveway washing the new beautiful black 911 Porsche Cabriolet. It was surprising for Larissa to notice a car because typically she was not drawn to material things but there was something so unique about this car, the color, the convertible top and the shape that caught her attention. Larissa had very little knowledge about cars at all but most people including her knew that a paper license plate meant a new car and besides the unique looks. I kissed her nipples through her bra and they started to harden straight away.I then moved even lower kissing and licking her belly button before I got down to her jeans. I slowly unbuttoned them and pulled them down her smooth long legs. She was wearing some very sexy white silk underwear and by now my cock was rock hard and sticking out the top of my sisters panties. I looked up to see kit staring down at it but I quickly snapped her out of it as I licked the full lengh of her pussy through. And Stan and Kelly were still watching us. Or were they ... wait ... they were fucking again, too! Stan was buried inside Mom and Dad inside Kelly. Judging from the way that they went at it, it was clear that this particular swap was meant to make the first serious attempt at cross-pollination. I was active in humping my own sister before I knew it, turned on even more by the thought of putting a bun in her oven, too.“Do it ... breed your sister! Fuck her good and hard! Knock her up!” Dad.