Good boy!
Now get to the edge again. But this time I want you to go VERY slow.
The closer to the edge you get, the slower you should go. When you can't take any more, let yourself go over the edge, but stop stroking.
Hopefully you will dribble out without much force at all. That's how I like it. I DON'T like to see your tiny little penis SHOOTING, only DRIBBLING.
So do it, right into your beverage.