The first two days I stopped by to make sure everything was OK, and nothing happened. The house was cold and dark. On the third day, though, something...happened that I will never forget... I was checking the house, just as my aunt had wanted me to do. When I unlocked the door, I noticed that the living room light was on. I didn't remember turning it on, but I didn't think much about it. Then, as I got to about the middle of the room my aunt walked in, completely nude, drying her hair with a. ”Fascinated, I watched her lower her slacks and carefully remove her T-shirt. She was wearing the sexiest black thong and bra set I had ever seen. The thong was so narrow it hardly covered her pussy. The bra was cut so low; I could see the top of her areolae. My mouth was feeling like it was full of cotton.“Feel how soft the material is.”Looking at her, I saw she was smiling. The only places to touch the material were covering the areas of her body I had been coveting for months. Did she really. I have her note the amount of pain this causes her (apparently not too much, as she remains silent and unmoving).In phase two of the experiment, I put my sister in a strict hogtie - still on her back, but now her legs are tied above her head, and her arms are tied to her legs. This stretches the skin on her ass taut, which is just what I want. Now I whip her ass another 10 times with the same flogger. I can already tell that it is more painful, but this may also be a result of the previous. .. oh Christ... again... I'm groaning now each time my penis pulsed out another part of me.Finally, drained, I dove laughing into the cool pond waters. Surfacing I looked up and saw another glint of sunlight reflected from Maddy's binoculars. I laughed again, knowing that the young girl, as she slept under the stars tonight, would dream of what she'd seen.As I walked naked back towards the cabin I decided I'd go after her tomorrow. Half an hour later, at only six-thirty, with the sun still.