I went over to the bar, chatting with our guests along the way, and began to make a large shaker of martinis. Jess went to the fridge and grabbed the ...ow frozen martini glasses. Once everyone had a glass, we toasted the evening, clinking glasses, took our initial sips, and went about the business of preparing dinner.Bill helped me get the salmon planks out of the fridge, and we went outside to the grill. Jess and Sharon stayed in the kitchen to prepare the rest of our meal. Once the planks were. I could hear my sister in the bathroom drying her hair, so I knew I wasn't the first up. I went into the bathroom to pee and I was right, it was my sister wearing a pair of boy cut panties and a baby T. I never would have thought of my sister as sexy, but at this moment she was. I excused myself to pee and she smiled and watched. When I was done she asked if I would put some coffee on for the two of us and I agreed and headed to the kitchen.I was already pouring our cups when she came. My hand ran down her thigh and onto her material clad leg, her thighs parted as I began moving back up She moaned aloud as I gripped my hand roughly over her mound the heat coming from her was amazing. I pressed the thin transparent material into her wetness and she moaned long and warm into my ear. My thumb pressed into her already swollen clitoris and she pushed up to me my fingers bucking her hips off the bed. My finger broke the skinny fabric and went straight into her once again tight. I then opened her top to expose her hard nipples, we both sucked on her nipples very gently while running ours hands over her body We slowly started to remove her tights, now seeing how sodden her pussy really was, there was no hiding how wet she was, her panties where completely see thru from all the excitement.After tying my wife’s legs to the posts, Rob asked if he could have the wet panties, I don’t see why not I replied, gently ripping them of my wife , he placed them on the bedside.