Assassin angel (Natasha Romanoff x G¡p Reader)

Before man kind was created there was an angle who was the strongest of all beings of her kind and one fateful action changed things. Y/n y/l/n, fallen angel and now ruler of all mythical creatures (except humans) walks the face of earth becoming an assassin. But when she fat caught by the Avengers will things change?

Sorry for any grammar mistakes.

Leave some suggestions and I will see what I can do

P.S. I could really use the help