Take another rubber band and put it around just your right ball. Make sure it's tight enough to not slip off, but not cut off the circulation. You wouldn't want to accidentally castrate yourself...
Do the same thing to your left ball with the remaining rubber band, remember, nice and tight.
Time to stroke again, this time a bit faster. About one up-stroke and one down-stroke for every second. Unless specified, keep up this pace throughout the tease. Only stop if you are given other instructions.
After about 30 seconds you may continue.