All Hail the King (Loki Fanfic)

Asgard had always taken great pride in its royal family. The great king, Odin, All-Father and protector of the Nine Realms. The gentle queen, Frigga, mother of the Gods and skilled in the magic of Seidr. Thor, eldest child, God of Sky and Thunder, wielder of the great Hammer Mjölnir. Loki, second born, God of Mischief and Lies. Lastly, Astrid, only a bit younger than Loki, not yet earned her Godly title.
Growing up, Astird was always very close to both her brothers, acting as a catalyst that kept them together even through tough times, though she typically stayed close to Loki's side and he to hers. No matter the adventure or danger, she was always right there with them. It went against Frigga's wishes, but she even trained alongside them and was raised as a warrior as well as a lady. Imagine everyone's surprise when she became just as good, if not better, as Sif and the Warriors three, earning her a rightful place by their side.
As the years passed, she became more and more distant to Thor, Sif, and the Warriors, and grew much closer Loki, seeing how the others unfairly treated him and not liking it one bit. The two spent great deals of time together, usually in the libraries, walking the gardens, and even causing some mischief with one another. It's easy to see how attached to each other they are, practically glued to each other sides, though no one seems to notice just how close.
Unaware of the events about to unfold before them as Thor is proclaimed the next king, Astrid will soon find that she has not only been raised on lies but as also unknowingly sworn her allegiance to the wrong prince.