When I was 11, we had a girl living with us in foster care, she was 12 at the time, and VERY well developed...
We were riding mini-bikes one summer afternoon, herding in the cows, when we stopped to take a break under the shade of a tree.
For some reason, I felt the "need" to run my hands up under her sweatshirt and feel her up, AND SHE LET ME!
Dad never did figure out why it took us 2 hours to get the cows in...