Begging is key. Lots and lots of begging. Phrases like, “fuck me,” “please,” “use me,” and “I’m yours” will be your friend. There’s also plenty of easy things like, “i want you inside me,” “I love when you use me,” “please god, more, that feels so good.”
You can always ask for permission to do things! “May I please suck your cock, sir, it feels so good with my lips wrapped around it,” “I really want you to tie me up and fuck me until I can’t breathe, please?”