Take the bucket and fix it to the hanging shoelace.
It should be hanging between your knees, if it's not, try again until it is.
Good, make sure its secure and won't come off, give it some tugs, jump a little, I don't care just make sure it's secure.
Hit your balls 50 times for every retry it took you after the first, you will learn to do this fast.
You know...if you are a good boy, I might think of letting you cum, but for now, only ballbusting.