As funny as it is seeing you cover your own face with cum, I want you to perfect getting it straight into your mouth whenever I tell you to. I want you to learn how to get it straight from cock to mouth, so you get the biggest possible mouthful in one go. You'll to get the full effect of a load of cum hitting the back of your throat.
I'll get you to practice over and over until you've perfected it. Every time you fail, you'll be punished. I find that's the quickest way for you to learn. I'm going to make you an expert cum slut.