Is it necessary to bind his balls to whip her cuckold? Certainly not – it’s not even necessary that it be about torture. Discipline is often constrained for torture. One is meant to correct poor behavior, the other simply to reinforce proper behavior.
Binding his balls and using ’em as a leash to control his positioning isn’t necessary either, but it reinforces a different role and usage for his genitals than that of a bull.
Symbolism and humility can often be far more effective in training a pet (male or female) than the suffering they endure through torture or discipline.
To be entirely fair, a Master who owns a couple should ensure one as well as the other experience such care and training.
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