Simple instructions followed: silent release

Holding her stationary with an iron grip, you start to fuck her ass. The hard grip motivates you, and fuck her ass with great speed and ****. She remains amazingly silent, the only noise emitting from her is her fast and shallow breathing, which almost whistles around the gag in her mouth. You have to monitor yourself to not let out your own stream of grunting. The only sound in the room is the dry slapping of your thighs against her ass, and the quiet squeaking of the bed giving way to the **** of your blows. Her ass is tight, and the **** you are applying is partly just so you can push yourself all the way into her resisting hole. Each shove into her sets her un-grasped breast in motion, and it bounces around wildly, the only part of her body in motion. Having emptied yourself numerous times already today, your body is in no hurry to ejaculate, and you continue cleaving her ass for several minutes, maintaining a lurid status quo.

After a few minutes, your mother reaches out a hand to grab the vibrator near you both on the bed. As if in punishment for this movement, you pull back on her hair even harder, squeeze her tit so tightly that you can feel your own knuckles growing white, and fuck her even harder and faster than before. You think you can see her squeezing her eyes shut in concentration, struggling to keep from crying out. Her breath is momentarily taken away from her, her shallow breathing stopping, leaving the only sound to be the slapping contact of your thighs and her ass. This continues for several seconds, then she puts both her hands between her legs, you hear the humming buzz of the vibrator, and the wet sound of fingers entering and exiting her pussy. You do not let up, but keep fucking her as hard as you can, her breathing again coming in ragged shallow puffs.

Her body is already drawn so tightly that the only way you can tell she is having an orgasm is when her breathing stops again, held in her throat. You can hear the gag crunching slightly, her teeth transferring the noise that she would otherwise be emitting silently out of her body. You keep fucking her, her clenched ass providing an even better fuck now than before. You feel her squirm underneath you, as if she is trying to pull herself away from you, but you hold her close to you, and do not relent. You notice as well that the vibrator has not been turned off, nor has she stopped pumping her own pussy with her fingers. The clenched ass muscles provide you with the edge you need to catapult yourself to your own orgasm, so you pump it as hard as you can. For twenty or thirty seconds you continue to pump, your mother's body twitching in a drawn out orgasm, her breath still stopped up, the slapping noises growing wetter as sweat streams down your body. Finally, with a final shove, you hold her against you, and empty yourself into the deepest point of her ass that you can reach in two long gushes. The sensation becomes too much, and suddenly you shove her away from you, throwing her down to the bed, off your cock. Falling to the bed in a limp clump, your mother holds the vibrator against herself several seconds longer. Now with a better view of her face, you can see that it is starting to turn blue from not breathing, and realize that your mother is experiencing an asphyxiation-heightened orgasm. Finally, she pushes the vibrator away from her clit, and sucks in a long, fast breath, her breathing transitioning instantly from nonexistent to fast and full.

You watch her, still twitching on the bed with post orgasmic shivering, her ass gaping from your onslaught. Your own cock oozes out a slow stream of leftover cum, which you did not have the fortitude to empty into your mother. Suddenly, you feel extremely tired, and you turn and fall onto the bed next to her, laying on your back next to your mother who is on her stomach with her face turned away from you, still sucking in breath like a fish out of water. You are dozing within seconds, and your conciousness drifts.