Elfen Lied (LucyxMaleReader) Lillium's Descent

We all know how it ended, with that strange figure at the door. Who was it really? It could have been anyone....even HER. Did Lucy really come back, did she decide to let Kouta open that door and face her again or did she make the painful decision in her heart to walk away forever? ( All rights go to their rightful ow...