Slowly build yourself up to an erection and then stop. Then slowly build yourself up again then stop. Then line yourself up with a table.
Take which ever hand is not your throbbing wanking hand and use it to press it against the table (this feels really good if you put lube on the flat surface) Rub your hard one with your left and ad slide it back and forth against the table at the same time. This feels amazing! Timmy