I had a few requests for the same kind of plot, I don't really write anymore but I hope somebody will get inspired by that:
A man/teenager walks in a forest until he find some young girl relieving themselves (camping girl scouts or whatever). He hide and decide to come back regularly to peep on those preteen pissing and shitting, until one day he get caught by some of them and get blackmail into being their slave.
I'd love seeing someone making a good story out of this.