The Black Foxes and The Scarlet Foxes

What if the MC wasn't a curator of a museum? What if she was part of another group of thieves who are rivals of the Black Foxes? The third rule of the Scarlet Foxes is to 'Never fall in love with your enemy'. What if she accidentally breaks that? What will happen to her and her love? I don't own this! I just own the idea for my story. Please read and review. Thanks.