I used 2 meter long glassy smooth plastic tube (made from skipping tube) and it curls inside my bladder.. the feeling is great and i felt like i was cumming all the time when it was inside.
Nice job man! I have done the same thing multiple times, twisting the cable and fucking my cock with short in and out movements until deep inside my bladder through my prostate. I can have a huge full body orgasm without shooting any cum, and that after feeling lasts for quite a while. The twisted cord feels so fucking amazing!