Add another rule, in pen.

You leave the vibrator buzzing inside you while you search your purse, pulling out the rulebook and a pen. You ignore the pencil this time. You know if you leave yourself an out for this one then you’ll use it.

Old rule: Submissives are always aroused but are incapable of orgasming without a dominant’s permission. Dominant’s rarely give permission.

You collapse back down onto your bed. You go back to masturbating. Some part of you hoping that the rulebook didn’t work this time. The rest of knowing and glad that it did. Soon, you give up trying to cum. You're a sobbing mess on your bed, but it is clear that no matter what you do, you're not going to get that blissful moment.

Orgasm denial has always been your biggest kink, but you’ve never had the self-control to really go through with it. Now, it's your life.

You fall into a dreamless sleep imagining all the wonderful, torturous rules you are going to create.