(A Fullmetal Alchemist Cinderella AU) Roy Mustang is a prince in a small kingdom known as Abitarea. Edward Elric, is an alchemist in the kingdom. He lives with his brother Alphonse Elric, Van Hohenhiem (his step dad) and his step sister, Winry. Everything is perfect. But that's the outside look. In reality, Ed's in hell. His family abuses him every time he messes up. To everyone in his household (except Al) Ed's a she. And to them, her name is Edlyn. And where does Roy come in? His life is saved thanks to a beautiful maiden. Now, he can't get her out of his head. And her name? Edlyn Elric.

Equivalent Exchange. The basic law of alchemy. It begins the chain of exchange. The passing of information, rules or even traditions. But that's not always the case. Roy Mustang needed stress relief. Edward Elric needed information. They make a deal. There's only one rule to this deal. Everything that happens, means nothing. Or so they thought.