Wanking isn't always easy
Stand on one leg. Now stand on tippy-toe. If your raised leg, or your heel touches the floor, or your non-wanking hand touches anything, you have to let go of your cock. Got it? I hope you have good balance and good strong calves.
Because finally I'm going to give you permission to touch your cock with your full hand, gripping it your favorite way, stroking at the speed of your choice AND give you permission to cum. Make sure you have your balance before you start... ok, go!
Stroke frantically now, before you fall down!
It gets harder not to wobble the closer you get to the edge, doesn't it? If you actually start to squirt, you're almost certainly going to lose your balance, have to let go and ruin your orgasm.
Now that, that is funny.