Shame on that sissy. Eat your cummies little sissy. You shouldn't let it go to waste.
By the way, a little secret that can help you sissies get there. I'm a bit of a panty rubber. I don't like cumming when I can avoid it, but I enjoy the edging. Usually, I only allow myself to cum hands free with my dildo. I'm pretty good at edging, but occasionally I go too far. You can feel it's about to happen. So, when that happened last month, I had my coffee cup nearby and used it. Of course, then I had some coffee.
It's not that I'm against the taste. I love the taste of cum. It's just that I kind of liked using it as my special coffee creamer
Moral of the story, keep a cup nearby when you cum. Use a condom and don't stop to think. Immediately empty that out in your mouth. There are easy ways to do it.
There is no excuse for not eating your cum, sissy. Plus, you when your Mistress asks you to do it, you mustn't disappoint Her.