Sentence:  That's not a threat, sir, for they have played fair with me, and I sha'n't sacrifice a penny of their money—unless they force me to do so. But—I'm in control. I'm <WSD>sitting pretty</WSD>. They can't unseat me, and I warn them not to try. 
Meaning of the word marked with <WSD> tags:  In a favorable situation, especially a situation in which one possesses an advantage.