They sat facing each other, but it quickly changed to side-by-side when it became apparent that Mary couldn’t tell a lager apart from a pilsner. Fra...kly, Jack couldn’t either, but reading the menu became a series of jokes and musing on the tastes of beer that neither of them cared. They ordered, and started talking. And talking. And talking. Everything became a topic. There wasn’t a taboo or subject that one or the other could not expound on or question the other about. They kept talking. Susan sat back and asked me if I had enjoyed what we did. Of course I told her I loved it. She smiled and kissed me again then she surprised me by shoving her wet panties into my mouth. She then made sure the vibrator was secure in my ass and pulled my panties back up. She left me there tied to the bed as she went to take a shower. Time seemed to drag on and I was starting to wonder if Susan had forgot about me when the bedroom door opened and Susan lead Mark into the room.Mark looked. I was shocked to hear her and kept quiet smiling but she said that why am I quiet as she knows that I have enjoyed the touch as she too enjoyed and I was thinking that is this seriously happening! Now I knew that I got the green signal and I asked her whether I can feel that feeling again.To my surprise she said yes and she touched my right hand and kept on it. I was getting hot and horny and my dick started gaining its erection and she noticed it and kept her hand on it and slightly pressed. Each body has mass, and each body’s mass has a gravitational effect on the other. Of course there is the gross overall effect of attraction, that’s why the Moon orbits the Earth. You can look at the Earth as a single body and the Moon as another single body, and it’s fairly easy to calculate the total force from each on the other.You can also, if you’re good enough with calculus, calculate the effect that each body has on each and every individual atom of the other. If your math is right, once.