Never!

"Beg me," Helene commands. "Fuck you," you reply defiantly. Helene's only response is to lube your ass up with her thumb. She spreads your cheeks with her hands and pushes the dildo into your ass. It's well lubed, but you still scream as she forces it all the way in. All you can do is lay on the mat, face down, hips up, ass in the air, as she mercilessly fucks your ass. She starts giving you a reach-around, matching the stroke of her hand jerking you off with the stroke of the dildo pounding your ass. You end up shooting your load, some of it getting on your stomach, some on her hand, but most on the mat. With this she's done and takes the dildo out, wiping the cum off on your back. You end up laying on the mat, a beaten sweaty mess, congealing jizz on your stomach and back. Even still Helene isn't done with you; she rolls you onto your back and comes up to your head, waving the dildo in your face. "Clean it," she orders. You refuse, mouth tightly shut. She holds your nose until you have to open your mouth to breathe, then sticks the dildo in, fucking your face with it for good measure. You gag and almost ****. When she takes it out, you're well and truly defeated. Helene puts a foot on your stomach, posing over you, her beaten prey.

Better luck next time.