When I was about 13 I had a fascination with all things sexual. Of course, I was also chicken and did not actually have penetrative sex until I was 20.
Anyway, when I was still babysitting I used to show off all my goodies to my 'charges'. I used to tell them that it was time for their bath, and that I would have one with them. Now, most of these little boys would have been about six or eight and they did not mind having a bath if I was naked too. I used to LOVE to watch their little penis's get erect as I took off my bra and panties. I would of course always show off a bit, like pulling my lips apart and making sure I cleaned real well. Usually, I would encourage them to masturbate if they knew how or I would show them (I had a brother).
If you like, I will tell you more.