Femdom restrains sub and tricks him back into chastity with sentencing reveal

Rod is naked, blindfolded and restrained stood up with his legs spread, ankles shackled, wrists shackled down by his side. I give his balls a quick lick as he was expecting at least a ruined orgasm but then I surprise him by putting his cock back in his chastity cage and locking it up. He then gets to choose one of four envelopes which will determine the minimum time he will wear the cock cage for. I then use a semi-permanent tattoo pen and write his sentence on his waist and then remove the blindfold so he find outs he's locked for a minimum of 50 days and its written on him to remind him???? Unlucky, the other envelopes weren't much better! His last sentence was 48 days so this one had to be longer didn't it.