Because handcuffs come into play which increases excitement and arousal, it only makes sense to add another person or more into the mix.
Multiple sets of cuffs can be used to spread the arms and legs of the sub and make them doubly vulnerable.
Just imagine, a smoking hot mistress in a full latex outfit and high heels spanking her sub while the sound of skin hitting skin reverberates throughout her sex dungeon.
Watch as policemen and women apprehend their targets and pound pussies inside jails.