My plan was pretty simple…and pretty stupid when I think back on it. I was going to walk up to his door, knock and ask if I could come in. In my min... I had imagined that he would know immediately why I was there, and be so full of desire for me that he would invite me in and the rest would take care of itself. Walking through the village my adrenaline fuelled butterflies were so powerful they made my breathing shallow and my legs weak. After the short walk of a few minutes I was there. I stood. What would normally be burned off out in the water was being diverted to the islands.All of the carts, tractors, and other vehicles had been converted to natural gas. Mark had even been experimenting with a way to fuel the light sport aircraft (LSA) with natural gas. All the boats used on the islands were powered by the free fuel, and Mark was experimenting on how to power the big resort hotel's air conditioning systems with natural gas.The next afternoon, Mark asked me, "Would you be willing. She then, would put her pussy over my face and I would lick it harder than before. While doing that, I would be pinching her skin on her thigh with one hand and would be rubbing her nipples with the other. When she would have enough, she turns back around and floats the entrance to her pussy over the tip of my dick. I would grab a condom, put it on, and as her eyes are looking into mine and her smile would appear, she would gently go lower. As soon as my dick felt her wet juices, she would. “Ow! Why you!” Amber growled fiercely as she dove back on me and started trying to tickle the shit out of my ribs.We broke out into a tickle fight, where even though I outweighed my sister by roughly eighty-five pounds, she put up as good as she got. A few minutes later, we declared an unspoken truce as we both collapsed upon our backs, laughing still and gasping for air. We both glanced over at each other, huge grins splitting our faces with jovial glee. The tenderness and love within our eyes.