Try using a bullet during a BJ - alternate fast and slow just like you would your mouth to make him get almost to climax then come back down. Use it on his haft, balls, or even under his balls. Alternate between all three and he wont be able to control himself. Also, a small bullet is perfect to place on your clit when you are on top. You'll get the stimulation directly on your clit and he'll feel the vibrations too! A lot of cock rings I've seen on this site have the bullet built in to double both his and your pleasure. This has to be about the easiest way to get him comfortable with playing with your toys (when I say your, I mean plural - it's always better to use them together!!).