Get that small cock so she can see just how little it is! To see it properly, your humiliation mistress probably needs to get her reading glasses out and a magnifying glass. Sine it is a worthless organ attached to your body, you will really have to make it up to her in many ways.
If you’re lucky she might let you cum, but not to worry it won’t go to waste. She is going to save up what little bit of jizz squirts out of that tiny head so later on in the week you can have a nice healthy snack. You will definitely need to tell her how bad you want to eat your own cum.
You may as well admit that you have been defeated and you will be ruled by a dominatrix for the rest of your life. The only way that you will feel accomplishments is by making her happy and keeping her happy. So, complete every task, perfectly.