Attack on titan - Erens sister - an Ereri story

Eren has a long lost sister that was taken away from the family when they were 8. As time passed, Eren got a adopted sister Mikasa and the wall was destroyed, Eren had forgotten about his sister.As the Scout Regiment kept watch over Eren he and Levi start to fall for each other. But Eren doesn't remember that him and his sister are no human nor titan .
Will Eren remember his sister?Will he go back to normal? Will Levi handle the truth about Eren? What will happen?