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A submissive twink awaits his master's command, knees on the cold floor, eyes downcast. The master, a stern dom, produces a vacuum pump, a wicked grin playing on his lips. He orders the slave to present his nipples, pinching them roughly before attaching the pump. The twink gasps as the device begins to suck, his nipples engorging, turning a deep red. He whimpers, but the master commands silence, delighting in the slave's discomfort.