A demonic shadow

"I promise to always protect you" said the little 5 year old demon boy by the name rin as he looked yukio deeply in his eyes . Yukio was a little fragile but determined Boy, the same age as rin .

As the two widely different boys grew up rin became like a shadow for yukio who always helped and protected him.

But what happens to rin when yukio starts teaching at a cram school for exorcists, and rin forgot to mention that.......

He is the son of Satan himself

In this fanfic rin and yukio are NOT brothers but might as well be because they are so close. I am really bad at writing and English is not my first language. But I hope this terns out okay anyway. This was just an idea that popped into my head out of nowhere and I do not have a plan going into this so please comment and come with ideas I don't like ghosts readers

Oh and no ships in this sorry

If you don't like it don't read it

Last thing I don't own blue exorcist and/or art unless I specifically write it is ok :)

Enjoy!!!!