Not only do small cocks cum big, it is wonderful to get all the cock in your mouth and keep it there---and a whole lot easier to tease it with your tongue. I LUV THEM.
have to say those who suck my cock get it all in and receive all the cum i have. some days more than others (since i cum alot) but nevertheless a load.
had a friend as a teen he was 4.5 inches but would give you 10 to 15 shots of thick cum never spilled a drop
And we often cum quick too!