How about a wrestle, and surprising grab of the cock when he least expects it?
Or how about edging for two days before your due to have a session together, making sure that when you cum, you cum like a fire hose?
Maybe sneak up on him when he doesn't expect it, then take a pic and post it all over the internet. See if he can find it the next time he spend eight solid hours searching for porn!
You could always take up Yoga, or have a rib removed (known as the "Marilyn Manson Method") then half way through your jacking session you pause, bend over, and suck the cum out of your cock for your buddy to watch!
Ok, that last one isn't very plausible. You either have the gift or you don't. So how about really shocking him and getting some body art done?
Personally, I wouldn't be able to wait for that to heal.
