It's just a matter of time and the odds as I keep flipping the coin of choice. Sooner or later it comes up tails."He laughed once again. This time i... was the sound of true laughter. "But there is always that infinitesimal possibility that the coin will not be heads or tails. Impossible as it seems, a coin can land on edge... and stay there. The chances of that are very, very, very small, but the impossible will happen occasionally when you flip coins through all eternity. Tonight the coin. Or maybe I should start fucking him a little and see where it leads...As I contemplated, Hank's butt began to push back against me and slowly grind against my cock. I guess we were both thinking that we'd like to go again then! I pushed gently against his grinding motion and he moaned softly as his eyes opened and he turned to kiss me.I could still taste the cum on his lips from last night. It obviously didn't gross him out to taste his own cum and I found that to be terribly erotic. I started. Their mother, lay helplessly bound and stark naked on the bad, a look of strange excitement and fear on her face."Dad, what's going on?" Jack said, stunned. "You can't treat Mom like this. I mean--" Shut UP!" Mark said. His anger gave him complete command of the situation. His voice calmed down a little as he unbuttoned his shirt and began undressing."We are what we supposedly call a close-knit family. Okay, we're about to find just how close-knit we are. I want both of you to undress, right. Similarly seeing your tits sit so proudly in the tight top you have on has driven me crazy.That's why that once we get on the last train home we have both had enough of teasing each other. I can almost sense how wet your pussy is as you look me in the eye suggestively as our train pulls out of London. As you cross then uncross your legs i can see the tops of the stockings you have on, this makes my cock throb immediately and you know it. Our carriage is by no means empty but you cannot wait..