In this intense BDSM session, King Calvin and King Mark explore the art of CBT and ballbusting. Calvin, the dominant force, commands Mark to present his nuts, which he does with a mix of apprehension and excitement. Calvin then proceeds to cup, twist, and slap Mark's swinging balls, causing him to wince and moan in a delightful mix of pain and pleasure. Mark submits beautifully, taking each impact with growing resolve, his cock hardening against his thigh.