A tease for two...
If you have any rope or strings left, use them to tie up his package.
Wrap it around the base of his cock, and around under his balls. Pull it tight, and ask him how it feels. Give his balls a few light slaps and watch him squirm.
If you want you could also tie his feet together for more control.
With him tied slowly stroke his cock. Make it very slow. You do not want him to cum. If he gets close, back off for a few minutes. Perhaps make him go down on you again.
After you get him to the edge a few times ask him what he would do for you in order to cum today.
Make him promise you something. Does the yard need to be mowed? Your car washed? At this point he'll probably offer you anything.
After he has been played with for awhile continue.