Hand jobs are basically a "penis massage" and are a lot of fun by themselves and go well with fellatio, you can even use it to bring him to Orgasm.
Here are some ideas to try!
Crank it
First lube your hands up, and then you can grab his penis rotating your hand around the shaft, like your revving a motor cycle throttle or rub the penis between both palms, as if rubbing two sticks together.
Endless Deep
With your first hand lightly grasp the top of the penis and then stroke from the top to the bottom where you release your grip. If you alternate your hands fast enough it will feel like he's endlessly penetrating you... oh and remember to use lubricants!
Head Massage
When his penis is fully erect, place the open palm of your hand (make sure its well lubed) on the head or glans of his penis and gently rub it in a clockwise or counterclockwise motion. This can quickly drive most men to orgasm so communication is key, this is also a means men have used to last longer in bed and cure premature ejaculation.