I flashed to a 11 year old girl
When I was on holiday in Spain, the male and female toilets were next to each other.
I saw a hot young girl going into the girls toilets, and realised that I would be able to see her come out when she was done, from where I was 'pissing' in the urinals.
Sure enough, about 2 minutes later I could see her coming out, so I stepped back from the urinals, into her view and stroked my engorged cock, whilst winking at her. I was 30.
She paused for a second, assumably in shock..and then blushed and sped up.
I never saw her again.