About a year after catching Bev, I had a chance to catch her younger sister Betty (named changed to protect id) enjoying herself.
I couldn't believe my luck at having caught the older sister fingering herself but now had another opportunity to catch her younger sister Betty doing the same thing. It was the winter of 84', I had often stayed over at the neighbors house due to me being friends with the brother. It was the holidays and they had relatives coming for a few days stay. One chilly night, their dad threw several logs into the stove as gas heat hadn't become popular then where we lived. It was getting quite warm after everyone went to sleep. As their relatives took over one room, we were forced to crowd his sisters bedroom. My friend and I slept on the floor, and the older sisters slept in the bunk beds in the same room as luck would have it.
Around 3am I got up to get a drink of water and not long after I got back on the sleeping bag on the floor, I heard Betty rustling on the bottom bunk close to me. Nothing happened for about 20 minutes. She shifted on her bed, I raised my head to her level and from the light coming in from the hallway I could tell she had her hand in her pj's. Her head was turned toward the wall and in the quiet of the night, she made some slight guttural noises. I was maybe a foot away resting on one elbow and my head at waist and crotch level when I heard the distinct scratching of nails on pubic hairs. I knew that sound from having been witness to one such previous event by the older sister now snoring lightly on the bunk above her younger sister.
After a few minutes of the scratching I then heard squishing sounds. Not loud, barely audible but obvious as to what she was doing. Her legs were now spread slightly and knees bent a little and her hand moved faster and faster under the pj's. I held my breath and only after a minute or two (seemed longer) of this action Betty lifted her legs and knees came together. I laid back down quickly as she gasped a little and gave a short cough to clear her throat. I closed my eyes and pretended to be asleep as she got up and went to the bathroom. I sat up and reached for the area where her ass would have been and felt a wet spot the size of my hand and smelled my damp hand. It was the smell of musk and although already hard, I became harder still. She came back after a few minutes and went to bed. I masturbated for no more than a minute while smelling my hand with her still pungent juices on it and came in my boxers with several powerful spurts.
All of this must have happened inside of 10 minutes but as I replay that moment in my memory in seemed to take longer than it was. Perhaps I just remembered some of the fear that occurs when bearing witness to private moments. Betty was maybe 16 then and had a boyfriend so I'm sure she was already having sex and the squishing noises had to have been her own secretions. As my friend was every bit curious about girls I wonder how often, if ever, he caught his sisters masturbating?