Can anyone suggest a really good Klaine fanfiction?

Oh yes I can! There is this awesome series called the Fates series. Here is the link to the first one: link
Its really weird but totally awesome!

There's so many! but some of my favourites are:
Go Your Own Way - link
If I Die Young - link
Offensive Innocence - link
Got Me Doing Backflips - link
The McKlainely Series (and everything else by this author) - link
Sideways - link
Little Numbers - link
There's so many more amazing ones though aswell, these are just a few :)

Well, I really liked Scars and Stones: A klaine fanfiction (Chapter 1) on Wattpad, (Wattpad.com) and I also liked the Little Numbers Klaine fanfic. (Just search it, I'm positive it'll come up.)

Daddies! It's so good and it has lots of chapters and then another long sequel and then a one-shot follow up