I asked her if she had been making out with another women, she said he had played a bit but nothing else. At this point I tell her I have a suprise an... E makes her way over behind her. She takes my wife tits in her hands, starts to roll her nipples around while she starts to kiss and nuzzle her neck. My wife is stroking my now rock hard 6" cock and I knew I had made the right call.I back away as my wife turns and plants a full kiss on E as they move to the bed. As they switch from sucking each. I thought about this briefly, then decided to open it just a little, as I felt I had not kept my side of the bargain, it may present an opportunity to repay Grandpa, should he pass by.Quickly I got undressed, and started to play with myself. My! I was so wet down there, and all warm! I played what had just happened through my mind again, the sight of Grandpa unzipping himself and showing me his cock - I had seen his cock! I had got him to show it to me! It wasn't long before my breathing became. Keeping my legs closed he slides his cock through my pussy lips, feeling my juices coating him. He can feel the satin of my g-string under his balls caressing him. I am moaning as he continues to fuck my mouth with his tongue while his hands are squeezing my bum cheeks. As he is sliding his cock back and forth I can feel my orgasm building. He lifts my right leg to gain easy access; slowly slipping his cock into my tight wet juice filling pussy.I am bucking, pushing onto his cock as he thrusts. She tried to turn and smile as I held her on her feet but the crowd was too tight. By this time I was becoming so aroused by the feel of the her body swaying against mine that as much as I tried to ignore the situation, I soon developed an aching erection which seemed, as the girl was just the right height, to exactly fit into the space between her tanned legs just under her bikinied buttocks. As the bus lurched and bumped down the road, she became aware of my cock as it pressed between her.