An Interesting Form Of Cardio

You open the door to your office and hear a strange buzzing noise from the weight-room. You also hear what sounds like the sounds of a serious work-out. When you open the door you are astonished to find Mia, completely nude, straddling a sybian in the throws of a serious orgasm.

Her large and round breasts bob up and down as she can't help but rock herself against the merciless vibration. Her hair is a mess and her smooth body is covered in a sheen of sweat.

You don't notice your cock getting hard but are not surprised when you find yourself stroking it. Just then, Mia opens her eyes.