Rachel - Dead Hang [Commission] (Patreon)

Amy's homemade version of the Zlagboard, used to train climbers' grip strength, is no less brutal - if a little more prone to giving the user splinters. Either way, she's proud of the DIY skills as her sharp gaze flicks between her timer, and her utter pain sponge of a girlfriend.

A thirty second hold from the smallest, 2cm hold was pain. A minute was agony, as Rachel had screamed herself through tears in their earlier tests. But through pleasure and punishment and a lot of practice, Rachel's record had been creeping up and up. Passing six minutes, her crimped grip failing, Rachel's body was locked in tension, shivering and trembling as she felt so past pain she had almost disassociated with her forearms and fingers.

Amy, in an exceptionally rare circumstance, is speechless, biting her knuckle as Rachel destroys her previous record. She feels her slick thighs rub together as she shifts position, and closes her eyes to listen to Rachel hyperventilating. She'll need to clean up a heap of broken muscle-slave after this, but she's ready - and Rachel is willing.