Her small pink nipples protruded proudly. Her crotch was trimmed beautifully. She had a strong bikini tan line, which I was sure would be gone after t...is nudist trip."Damn," I managed to speak."Like what you see?" she replied, playfully raising her arms to pose.I snapped out of it and got back to reality. 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. We would have to act outside, but at least things could be somewhat normal at home. I pocketed my phone and made to leave my room when My Mothers frightened cry of "Martin!" came from downstairs. "Can you come down here for a minute, there's something your sister and I need to talk to you about." I stepped into the loungeroom to a most unnatural sight. Both my Mother and Sister Kelly were in the middle of the room bent down, face to the floor in a posture of total submission. "Please," came. " By having sex with me?" If that's what you want."My dick stirred at the thought. The memories of her body straddling mine and her breasts under my mouth sent my blood racing. God this was tempting. Unfortunately, my gut was queasy with the thought. I sat, thoughts churning. Tamara waited patiently."As much as I would love to have sex with you regularly, I can't do it," I said. "Sex with you was good a lot because you didn't have to do what you did. I don't want you to have sex with me because. Mark was defiantly interested in more than just teasing; he wanted to pay off his IOU and often reminded her he owed her a licking. However, as good as that sounded, she somehow resisted; mostly, because she thought it would be too hard to pull off at work and she wasn’t sure she wanted to go to a motel with him. The most difficult time not to submit was when they would go out after work for dinner or drinks with clients or other office members. Of course, there was a lot of drinking and.