She fucks your ass

Then your Mistress' thick dick starts slowly stretching your ass. After a moment, her fat cockhead slips inside you, making you moan out loudly, a strange combination of pleasure mixed in with a bit of pain. Mathilda moans in pleasure too as she takes your tight behind. "Good ****," she says, giving your butt cheeks another playful spank as that cock starts slowly sinking deeper and deeper into you.

It feels intense. You start squirming on the table, your own cock fully hard, twitching and leaking precum onto the floor as the metal of your collar rattles against the padlock and that D-ring connecting it to the wooden surface. You can feel your ass stretching to accommodate Mistress Mathilda's big cock. There's some pain, yeah, but mostly pleasure. As if you had been craving for your Mistress' cock in your ass for a long time.

The muscular blonde moans loudly again once her cock is eventually fully inside you, gently rubbing against your prostate as she rocks it back and forth just a tiny bit while resting it so deep in your ass. Mistress leans over you, her huge tits squeezed against your upper back. You can definitely feel her hard, pierced nipples against your skin. "You have a very nice ass, ****," she whispers into your ear. It's almost romantic, really.

Then Mistress Mathilda grabs your shoulders and starts pulling back slowly. She almost pulls her cock out before sliding it back in, settling into a slow rhythm of fucking your tight ass. Every thrust makes you moan as you squirm helplessly on the table. There's no way you could stop it even if you wanted to. Eventually she grips your shoulders harder, picking up the pace.

You feel an inevitable orgasm starting to build up inside you even without her touching your cock. That thick dick massaging your prostate with every thrust, combined with the incredible arousal of being so completely dominated by your Mistress, seems to be enough.

She senses it. "Hold it," she says, moaning loudly herself as she continues fucking you faster and faster, really pounding your ass by now. "A **** is not allowed... To cum before... His Mistress," she continues, breathing heavily as her well lubed cock fills your ass so completely, so deliciously time and time again.