There is nothing that compares to the moan or in this case the scream that escapes when a girl puts something in her ass. If you are an expert at anal, then usually the moan is a mixed sound of effort and pleasure, if you've never stuck anything more than a finger for more than one second in your butt before - as was the case with Halie - then you scream with a mixture of 1) surprise 2) pain 3) tolerance.

All three sounds escape Halie as she is determined to lose her ass virginity to the machines. She sweats, she groans, she cums, she rolls over in victory.