I had a buddy I used to do this with, it was great fun, we'd get it nice and airtight then both piss in the tube and let our junk soak in the piss while we pumped for a good hour. We used to drink beer, smoke cigarettes and kiss for the hour!
cool , i wish to have a boy friend who hase sutch a dubble pumping cock and balls toy! better is motor vacuum pump in that!! i will feel that life! and balls inklu inside!! and hold that over one houre to get him bigger i never see him and my balls!! its my dream in real!!