Endurance Training With Heart

She clips a leash to his circumsized cock and pulls. Hard. He moves on a string of pain, every muscle burning already. She likes that. Wants a slave with real staying power, so she doesn’t stop there. Between every vicious forward jerk she strokes, pinches, circles him with one fingernail, keeping him stiff, keeping him desperate. Whatever it feels like to him—torment or twisted incentive—she calls it endurance work, and she keeps the leash short, her grip tighter each time. By the time she’s finished he’ll take whatever she throws at him without a single break in stride.