I quickly shook those thoughts to remain more composed.“Did you want to hang out here a bit?” I asked. “As long as you don’t tell your parents..., you’re more than welcome to have a drink or two.”“That would be great!” she exclaimed with excitement. I helped remove her large winter coat, revealing a sexy, red, strapless dress that ended a few inches above her knees. I was now 100% certain I knew where this night was going.We went to the kitchen and got drinks, then went to the couch where we sat. I turned him around in my arms and lifted him up onto the desk. I spread his legs and moved between them. I pressed my hot wet lips to his as I unbuckled his belt. Then I unbuttoned his pants and slowly unzipped the zipper to free his hard cock. As he moaned, I pulled his cock out and moved my hand up and down his pulsing shaft. I moved my mouth back to his ear and whispered, “I want to give you the ultimate pleasure of us cumming together but I’ll wait until you beg me for my cock,” I licked. Low cut blouse, short skirt, high heels and makeup just ever so perfect."Why Olivia, you are looking sexy as hell. Getting ready to go and meet Mark?"Her face paled when I said that and she stuttered when she said, "I have no idea what you are talking about." No? You don't know Mark? Mark Willard, husband of Martha, father of Cory and Kevin? But hey, I guess that I can understand that given that he has so many names to use. Let's see now" and I looked at the piece of paper in my hand. "On. My Grandfather was close behind her pushing mother into my bedroom with his big hand on her bare bottom. Grandpa Jack looked over at me and smiled when he saw the naked teenage girl laying across my lap in the classic OTK spanking position."Don't stop on my account." He told me as my mother began to remove her father's clothes. It didn't take long before her father was naked pushing my mom down to her knees to take his big prick into her mouth.I wasn't sure what to do. Our threesome was tuning.