That river in Egypt

Rennala closed her hand around Damocles' balls, squeezing with as much force as she thought she could hold for the 20 seconds. His whole body lurched forward, but her bodyweight kept him down. She could hear and feel him groaning into her ass, but that wasn't going to make her squeeze any lighter. After a while she realised that she didn't set a timer or look at a clock, so she wasn't actually sure how long it had been. It didn't matter though, Damocles didn't know and there was nothing he could do anyway! She kept her crushing firm grip for well over what she thought was 20 seconds just to be safe.