Mistress Sonny wanted Joss to learn that she did not like excessively proud people. He wanted to date her and he had to understand that. But since he was slow to get it, she had to come up with a faster way for him to get what she wanted him to understand. And this was through choking him with her thighs. He cried and wished he had listened to her but it was already too late and he had to get his punishment.