What happens if you Cum when you're not supposed to? Well you will be punished of course!
As punishment for losing control, you will replace all of the remaining edges for the month you failed in with hard spanks on your bare ass with a wooden spoon instead! Be sure you make every one of them hurt!
And, don't even *think* about having another orgasm on the 31st if there happens to be one in the month you failed!
However, you may restart the challenge on the first of the next month.
Hmm... I'd say you don't want to Cum when it's not the 31st!