Its Mistress Maria.
"I don't know whats come over me tonight but I have a real urge to force a man's face right between my ass cheeks. And guess what? You're gonna be that man! Or my little ass worshipping slave as I prefer to say. Speaking of 'little', your cock is just embarrassing! Is that thing really hard? Anyway thats off the topic."
"Now lie face down and plant your face right between my ass cheeks and go crazy with your tongue. I like it fast, feisty and rough!"
You get down and bury your face right where Mistress Maria said. She then puts her hands on the back of your head and forces your face even further into her ass. She also wraps her legs around your upper body and traps you in a helpless position and starts humping your face.
"You'd better not slow the pace down back there! I want that tongue going at full speed for a full 2 minutes!"
After 2 minutes, Mistress Maria is satisfied, gets up and leaves. You on the other hand are left, semi-conscious, gasping for air on the floor.