Such a good girl taking my rough hands. That ass of yours is too big to not take advantage of. Go ahead and keep riding for mommy. I want my thigh to be covered in you by the time I’m done.
To know that failure means punishment as you perform a task they've given you that you are guaranteed to fail. For them to amusedly watch as you struggle so desperately to prolong the inevitable. To hear their voice goad you on, enjoying your suffering as punishment grows closer.