I needed to piss so hooked up a hose into the end of my dick and the other into a cap of a water bottle and let go of my bladder. It filled and pressurized the bottle as much as possible then equalized and stopped. If I squeezed the bottle, I reversed the piss back inside me and feel the sensation. I could add ice in the bottle and it would be an extra sensation. Other things like cola, brew, etc are hot too.

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