Here’s a snippet from the Ownership & Possession site on the subject.
In a weblog post, Tanos gave the following recipe for begging:
Say what it is you're asking for. This is what it's all about.
Say why it's important to you. This makes your vulnerability about this more significant.
Say that it's entirely up to the dominant whether you get it.
Say "please". A lot. That says lack of status (very polite) and that the dominant has all the choice ("please" is short for "if it pleases you".)
Use the dominant's form of address (or name, as appropriate) to help stress the status differential.
Use any available physical way of stressing the status differential (kneeling, hands clasped, tears etc.)
Don't do anything resembling negotiation. You're not striking a bargain. You're making it look like the dominant has all the power. They'll like that ;)
Keep doing all that, in some kind of slightly random, Jazz improvisation sort of order, until they let you stop.
Here’s the link to the whole post. Good luck!
His will; my fate.