There is a fine line between revenge and love

This is an Eric/OC story. Four has a sister Elli (her friends call her Bells), she is in the same year as Tris. Unlucky for Four, she is out for revenge. She teams up with the big bad dauntless leader Eric during initiation to make his life a living hell. Will she keep her head cool? Or will her partnership with Eric to get revenge on her brother turn in something more? Will she get the revenge she is craving? Who knows? Because after all there is a very thin line between revenge and love.