My favorite Inuyasha fanfic of all time has to be The lucky Ones by terri botta
"Sometimes Fate hands you a gift you never thought you’d ever get, and it’s up to you to accept it for what it is."
I loved this fanfic took over my life for a couple of days :P
I recommend it fully as the writer really does a wonderful job! You can really picture this as a series after the series kind of thing and she keeps the characters personality spot on to the Japanese manga.
you can view this fanfic here: