looking for wings au fic
so i read a fic long ago, everyone had wings, it was something that they were born with i think, anyways, merlin's were like covered in dirt to hide their real color. I think arthur and the knights found out and cleaned the wings. They found out the color and it was illegal in camelot so they got his wings dirty again to save him. That's all I really remeber and now can I can't find it, can someone help me please?