Re: my neighbor
Ejaculation generally isn't the first sign of puberty; pubic hair is. But, of course, everyone develops differently. What "normal" is, is unimportant.
As for your friend's endowment, that's not really "normal" either. It's well above average for an adult, let alone someone who just recently has started puberty.
"I don't believe in magic. But I do believe in interpreting coincidence exactly the way you want to." -Sherman Alexie