lol well at the risk of freaking anyone out, i'll delve into some more detail about what our gallant young males get up to at that age.
i can only talk about my case, but everything i have ever experienced has led me to believe that i am fairly typical (see BC's comment too )
i started masturbating around 5, and by around 8 i was masturbating till i achieved orgasm. When you're pre-pubescent, you have a normal orgasm but nothing comes out. You don't ejaculate, .. or rather, you DO ejaculate but there is no semen.
So at the age of 10, most boys are not just "touching themselves"... they are ejaculating, but no semen is coming out.
In my case, semen starting coming out when i was about 12. But nothing else changed... i still just ... err... masturbated to orgasm.
Sorry for being so direct

Yowie! :crazy:
so yes i think it would be unusual if Burke ejaculated semen at 9 going on 10. Quite unusual in fact, and improbable. But he would almost certainly be masturbating all the way to orgasm, if he was a normal, average kid.
And of course, we really have no idea what kind of kid he was! unfortunately. Apparently he played some mean nintendo though