Knew two girls back in high school who had some big naturals
The first one had massive ones right from puberty. She was a freshman and had seniors fawning over her. Unfortunately she got fatter and got a reduction.
The second one was actually pretty small through high school. I happened to see her at a bar a few years after we graduated and was genuinely blown away when she took off her sweatshirt to reveal her cannons pushing her tank top to the absolute limit.