I know how much you love following my instructions and being a good little sub for me. That's why you're going to stop jerking your cock this instant and you won't be jerking it again until your ass is stuffed.
I have a new toy that I want you to play with, a perfect butt plug to fill your ass.
You will only be allowed to jerk again once the plug is shoved up there. Don't worry I never steer you wrong. I know that you'll love that nice full feeling so much you won't be able to cum without it!