My Little Angel {Sequel to Fire and Ice}

After Eren's death, Levi gave up on life. But one day he bumps into a familiar looking person. After the boy's mother is caught up in an accident, Levi takes the boy home and becomes his foster-father, and the young boy is secretly hoping Levi would remember. That in his past life... They were lovers. (Sequel to Fire and Ice, if you haven't read it then I suggest you read that first.)