Seven Deadly Sins Estarossa x Fem Reader/Oc

So I decided to write this because the idea came to me when looking at spoilers, oops, also because I can almost never find an Estarossa x OC/Reader story. Updates are most likely going to be slow since this is my first long running story so far, so sorry for that in advance.

You are Monspiet's little sister Kiala (pronounce that however you'd like), Derrière's best friend, and Estarossa's mate thingy, whatever you want to call it.

Disclaimer;
I don't own any of the characters except any OC I add, I don't own NNT/SDS but the plot to this story is mine. I don't own any music or picture so all credit goes to their respective owns.