When I was 16, I dated my girlfriend. We had many jerks together. One day I went to her house when she was out but her younger sister was in.
The bathroom lock had a keyhole cover that was loosely attached so I positioned the mirror inside so I could peep whilst she showered. Sure enough she did. I got an instant boner at this. For 10 mins I saw her pussy as she showered.
After she was finished I went straight in to jerk off. But as I did I called on her to 'check the lock' whilst I positioned myself for the perfect wank showing her my member.
To this day I have no idea if she like me peeped. But if she did she would have seen my cock come in full view in the bathroom.
Fast forward six years and in front of her sister, no lie, she dared me to get my cock out. Which I wimped out of. Pressure and all that.
To this day she loves chatting/flirting with me.
I always wonder if she did see me jerk off that day.