She gets on all fours, her ass in the air, as the machine starts to pump in and out of her tight asshole. It's a relentless rhythm, and she moans with pleasure as she feels it stretch her open. The dildo is thick and hard, and it fills her up completely. She grips the sheets, her body writhing with pleasure, as the machine pounds into her again and again. She feels her orgasm building, and she knows that it's going to be intense. The machine fucks her harder and faster, and she screams as she comes, her body shaking with pleasure. She collapses onto the bed, panting and sweating, as the machine continues to fuck her. She knows that she can take it, that she wants it, that she needs it. She's a doggy anal machine rider, and she loves every second of it. The machine never stops, and she never wants it to.