Just now caught some of this guy's show on Chaturbate. His name is 'Meatyishere,' early 20s, str8. By his own account, he doesn't get up or walk around or do two-handed fapping, suck his own cock (though he could.) This is a 3 1/2 minute sample. (Obviously, I wasn't gonna stick around for the cumshot.) Anyway, in terms of size alone, i think he merits our attemtion.
Someone put up a 1-minute clip of him a few months ago that ends with a nice, splashy cumshot. Search under
"Meatyishere from Chaturbate" and it ought to come up.