Part of keeping a slave compliant and eager to please means making sure he knows that his cock is no longer his.
Pulled out of chastity and clamped into a nasty wooden vice, his dick is now my prisoner and unable to escape the cruel lash of my dovetail whip as I beat his cock and balls, stopping only to burn him with hot wax, only to start whipping again.
His pleas for Mercy are ignored and dealt with with more punishment. I do not accept safewords in my dungeon.