It's incredibly difficult for you to stay a sissy cum slut or even a good sissy maid right after you cum.
So for the next two days indulge any sissy fantasy you have. Wear your panties to work for the first time. Paint your nails. Go to sleep fully made-up. Play dress-up with everything you have (even try folding or taping some of your clothes to look more feminine if your wardrobe is a little sparse). If you're a very outgoing sissy you may even want to go outside and find something interesting to do. But however you spend your time do not cum.
You can even rub your clitty, so long as you have the restraint to keep your inner sissy in control and not making cummies.
And, as a bonus for sissy cum sluts in the audience, after two days there will be plenty more cum for you to enjoy!