I took him by his hands and we awkwardly swapped positions in the confines of the stall. I ran my hands over his smooth, stockinged legs, going in lit...le circles at the part of his thighs that weren't covered in nylon. I could see he especially liked that as his cock bounced up and down inches away from my face! My hands moved around to his buttocks, stroking them gently through the thin nylon knickers before working the under his perineum, feeling his hard erectile tissue through the flimsy. I did like to jack off in front of my sister just because I could tell that watching me stroke my cock was arousing to her. When she was younger she pretty much ignored my brother and me when we had an erection in her presence and started stroking it. She would usually leave the room or just not pay any attention. But now, I guess her hormones had kicked in and she seemed to actually want to watch us. At first she would just sit there and watch us stroke our meat with our balls bouncing up and. .I …err, err”, I uttered. “Tell me!”, she demanded. I told her I used to sniff her knickers while masturbating. Her mood seem to change, she was found it arousing. ”You sniffed them while stroking yourself?”, she asked. I responded positively as I could tell she was enjoying being told. I think we were both drunk and being a bit too honest.The next thing I know she got up and put her knees either side of my head. “Wwhhat are you ddoing?!?”, I stammered as she straddle my face and ran her pussy. When I returned home it was already past 3:00 p.m. and Sarah was still out. Since I was partly responsible for all the fluids on Sarah’s sheets, mine and hers, I washed the sheets and pillow cases. I didn’t do the wash because of any guilt or goodness on my part, but because fresh sheets on Sarah’s bed would, I hoped, allow for more sex. While I was at it, I wiped off the headboard and wall in back of the bed, as well. I was asleep on the leather chair in the living room when Sarah returned. .