And then, right as she reaches the end and feels a sense of pride for a task completed, pull up another bar with three more cocks, getting even bigger. When she is done with that one, having to use her weight to slide to the base of the last cock because it is too big, pull the original bar in place and make her do it all over again. Don’t let her stop, just keep pulling the bars around as she finishes on one (that way you don’t have to help the dumb slut turn around), making her go back and forth, bigger to smaller, never truly knowing what size cock she is about to sink down on. Her cunt needs to be ready for any size of cock, reinforce this. It doesn’t matter how tired her legs get, it matters that she follows direction.