She caught me wanking
When I was 16 I used to go up into the attic and look down through the fan vent to watch my older sister who was 19 in the bathroom. When the fan wasn't on, I would quietly lift the fan vent and peer down at her. I loved to see her tits because I had never seen any other girl and I was amazed that she had pubic hair.
One night when our parents were out for the night and after she came home from a date I snuck up into the attic and pulled the vent back to watch her touching herself on the toilet. First she slipped her hand into her blouse and rubbed her nipples and then she removed her blouse and bra to reveal really pert nipples. I pulled out my dick and started rubbing slowly careful not to cum too quickly.
Babs had a soft skirt on and pulled it off. She wasn't wearing any panties! Next she got off the toilet and grabbed some lotion and sat down next to the tub, spreading her leg really wide. Slowly, she applied the lotion and started running her fingers through her slit. I thought I'd cum right then. I'd never seen the pink of her vagina before. As she started to moan, she looked up towards the ceiling and I dropped the fan vent in fear she'd see me.
I knew I was in trouble because she immediately started yelling at me. I heard the creaking of the pull-down stairs and tried to jam my dick back into my pants but it was too late. I had a rock hard on and she stomped up the stairs yelling at me all the way how she was going to tell mom and dad.
She had thrown on her robe and as she got to the top of the ladder, she demanded that I come downstairs. After yelling at me for a while and telling me how rude I was to spy on her, she threatened to tell mom and dad unless I masturbated in front of her so that we would both be 'guilty.'
What could I say! I told her I would only if she got naked too. So, we went into my room and I took off my clothes. When my dick sprang up she told me that I was bigger than any guy she knew. She settled down and I could tell she was getting excited as she threw her robe over my desk and sat down on the edge of my bed.
As I had done so many times before, I slowly started to play with myself and spread my juices all over my cock. Seeing her naked right there on the bed was more than I could take and I could feel myself cumming but suddenly, as I closed my eyes and started to breathe heavier, she grabbed my dick and squeezed it say, 'you're not allowed to cum until I do.'
With that, she lay down next to me and started fingering herself into oblivion . . . telling me at one point it was ok to cum. It was something else! As she started to moan and scream, she opened her eyes watched me shoot my load all over the bed. We both were moaning and screaming and afterwards, we laughed hysterically.
We never touched each other except for that moment when she squeezed me to stop my ejaculation, but I'll never forget that one night we shared our orgasms. To this day, neither of us has ever mentioned that night but . . . I still can see her naked and wet and the memory is a source of great pleasure to this day.