I love waxing a nice hard cock, especially the exposed glans. It is great to see the cock jump and flick as the wax drips and spills onto it. The thighs of the slave quiver and the the pelvis thrusts are very erotic. The use of a heavy whip to remove the wax will drive the slave to orgasm. This technique of using a crop or whip on the glans can be used to keep the slave on the edge until you are ready to let her release.
Love the candle wax my mistress does it to me covers my cock and balls lets it set then beats the wax off with a crop till its all off. Several kinds of pain but so good. The slave should have been cuffed to stop him messing about.