You're looking good slave. Now I want you to tie the back of your collar as tightly as you can to the back of your panties.
If you've tied it tight enough, your head should be forced backwards and you should feel uncomfortably tight down there.
But that's not all - next I want you to tie your ankles together.
If you've done all this with sufficient tightness, then you may stroke for 20 seconds at your own pace.