Bench Warmer

At the very first spasm, I'll make you remove your
hand immediately. Then I'll tie a string to your wrist
to assist you in this discipline. This will afford you
an orgasm, but a very incomplete and unfulfilling one.

It will allow you to spill just the minimum of cum,
and generally in oozing leakage, not powerful,
satisfying bursts. This I'll get you back on the
path to a nice, full set of balls as quickly as possible.

Then, as the devil tease that I am, I will dramatically
restrict your technique. My personal favorite is allowing
only one fingertip, and only touching the top of your shaft.

I'll forbid contact with the very sensitive underneath
of the shaft, the head, and especially the extremely
sensitive ridge around the head.