"Remember" dad warned as they got in, "No wild parties and don't forget to lock up at night"We stood waving as the taxi went down the long driveway, w...ll at least I was waving with one hand, the other being up underneath the back of my sister's short skirt stroking her lovely little bottom through the gossamer thin material of her panties,With one last wave we closed the door and she turned to face me leaning back against the door,"Why have we still got our clothes on?" Why indeed?" I laughed. Things stayed pretty much the same for the next week, until I got home one night and found my father in law camped out on my doorstep. I liked Tom a lot, but I wasn't in any frame of mind to listen to what he might want to tell me. I assumed that Ellen was staying with her parents, though I hadn't bothered to check that it was the actual case. "Jackie, have you seen Ellen since she left here? She came to our house right after leaving from here and stayed only for a couple hours and then she. And the reality was, she was my sister, and it was incredibly inappropriate for me to gawk at her beautiful bare body."Let's put our clothes in the locker," I said. "The tour bus should be leaving soon and I don't want us to be late."We gathered our clothes and put them in the locker. When I stood next to my sister, I couldn't help but notice how sexy her body looked. It became abundantly clear that the awkwardness between us was only beginning.***Being naked around the older nudists wasn't so. " I said."Leave me to work out the details" she said, "Now take me home." I dropped her off and drove back home, all the way thinking of what had just happened and getting a quite uncomfortable erection picturing me fucking Mandy in front of her husband, fucking hell. I got home and to have a wank to relieve my aching cock.Next day at work I was dreading seeing her in case i'd imagined it all, or she would laugh it all off as her being drunk and winding me up, but no, she came up to me and.