The Ballbusting Kings, Calvin and Mark, rule the CBT scene with an iron fist. Calvin, the sadistic monarch, takes pleasure in exacting pain on Mark's vulnerable testicles. He grinds his boot into Mark's aching balls, making him moan in agony. Mark, the submissive prince, endures the vicious treatment, his cock throbbing from the mix of pain and pleasure. The kings switch roles, Mark now the dominant one, crushing Calvin's balls with a merciless grip, making him squirm and beg for mercy.