Anddddd stop!
I don't want you having any accidents too soon. It is a rule that goes without saying but you are NOT to cum in my presence with my explicit permission. And even when I do give you permission that doesn't mean you have to cum :)
If you want to impress me you can always hold it back. Restraint: that is a recurring theme throughout this tease. Physically restrain your cock with rope, mentally restrain yourself to overcome desire....
While we're on the topic why don't you go ahead and restrain your balls with a second piece of rope. Make sure it is at least one foot in length, and of course, the longer the better. Wrap it around, and around, and around, then tie it tight.