Mistress Lyra is very disappointed to find that her new slave has presented her with a tiny, useless penis. His little dick is so small that the Mistress punishes him with a no-mercy ballbusting: slapping, kicking, and punching his balls. Each time the slave falls to the floor, she pulls him back up for more. She reminds him that this severe testicular pain is what he deserves for having such a tiny, disappointing dick.
His balls get so swollen that she can't help but laugh at how much more pathetic his dick looks by comparison.