"Harder, hurt me," she shouted again.So I slapped her harder."Yes, yes," she grunted, "across my tits too."She had never called her breasts tits befor...; I slapped her hard across her pert tits. Her hips took off, grinding themselves against me."Oh my god yes," she cried, so I hit her again.Her orgasm hit her hard then and it was the biggest I had ever seen her have."Oh my, she sighed, "that was nice."She opened her big blue eyes and smiled down at me. In all the confusion I hadn't actually come. It was a light blue silk pullover and to my amazement, my little niece's nipples pointed through; she obviously wasn't wearing a bra.I caught my breath at the sight and she paused and smiled, looking into my eyes. I was sure that the youngster wanted me to do more than look; this seemed like a transparent invitation. Yet because of her age and our relationship a voice was screaming in my head not to do anything.Our eyes held and I could see that she was breathing very hard. I think we were both. Wow, just that finger was heaven, it burned slightly as she worked the lube into the muscular ring of my anus and I contacted around her probing finger trying to grip the slippery intruder.After a few seconds she pulled her finger out and wiped the remaining lube onto my scrotum. Bloody hell it was so damned hot being so exposed and awaiting the first touch of that huge cock that had so recently been filling my mouth to capacity. My mind was reeling from the sexiness of it all and the heady. Having showered and dried off we went to my bed, we just cuddled for a while, about ten minutes later mom tapped on the door, “Night you two” “Night mom” “Night Mrs D” Julie pushed the sheet off us and looked down at my cock, “Is Tony’s cock as big as yours”? “What makes you think I’ve seen it”? “I bet you’ve had wanking competitions or compared sizes” she giggled, “Diane and I have looked at each others pussy’s, and cum together” she saw the worried look on my face “Were not lesbians, we just.