You know what else you should try? Autoeroctic asphyxiation. Its where you pull peter, and when you're about to cum, cut off the circulation to your brain. Its supposed to make the orgasm 10 times better. But be careful: death is very easy to come by.
What you do is take a rope, make a noose, and put it around your neck. Then start punishing Percy in your palm, and just as you are about to cum, hang yourself. But you have to judge it right so you don't die. Have fun.