Lady Shay knew this guy had a fetish for fat mistresses and she was one of them. So she used her hot and fat body to tease him and enjoy controlling him with her flirting. The mistress had a great time seeing his dick so hard that she felt it could explode. But she did not put him out of his misery as she had tied him up. The mistress wanted to find out if he could cum without her touching him and he did.