Ever since the science accident - where my wife was cloned and I gained a second cock - my wives have been running experiments to determine just how much we have changed. And today is the CMax experiment - the cum max experiment - to determine just how much I can cum now ... and just how much they can take! Fuck, my cocks are so hard, and their apparatus inside my rear just makes me need to cum.... I need to fuck my wives ... for science, of course!