So did you do it? How was your luck, did you manage to avoid drinking your piss or did you have to face the humiliation of downing something actual, real piss from your own cock? Or did you get lucky? Even if you got lucky I still think that makes you a fucking loser for taking the chance of drinking piss just to try and increase your chances of making a mess from your cock.
Anyway it doesn't matter what you just drank, if you completed the task you have of course earned another cube. Surely you must now be close to release.