Whisper in his ear how wonderful he is (if you've experienced sex before) or french kiss his ear--do this right and he'll be squriming. If you have nails and he's not very tickilish, lightly run your nails down certain parts of his body (chest, arms, backs, stomach) and when you're giving him head, use your tongue. Don't just swirl it around the head...flick it back and forth along the base. If ya hit the right spot, I'm more then sure he'll be bucking against you.

Now if you can be in a alone setting handcuff him and bring sometime of feather like object, and run it all over him....just a few ideas. There's many more you can do.

Maybe ya'll could try new positions? Or even a marathon, where once he feels like he is going to cum, stop and try another one. You could make it last quite a while, and (as a guy), certain positions are more visually stimulating than others, and allow for touching in different ways. Also, I love when my fiance sucks on my fingers...

Get a copy of The Joy of Sex. It will take several years to get bored as you work your way through that.