Erm, seems to me you just want to write a revenge fic for the sole purpose of hurting the people who hurt you. Nothing wrong with that, of course, but is it really a good use of your writing talents? Is it really worth the possibility that they might just sue you anyway because you dared injure their pride? The way you then go off to say that you'll write a second book about them, you'll get the judge involves really makes me wonder if you know what you're doing. I've had people in my life, both real-life and on the internet, who have hurt me, but I don't focus my writing on making them cardboard villains in my stories. They're not worth the trouble. I agree with @Okon. Sometimes the best revenge is simply living your own life, a life that doesn't include them in any way, shape or form. A life where you didn't allow them to destroy your own happiness.