I know I just posted a rec post, but this was too brilliant to overlook!
Five Necessary Facts by
lucifers_toy[girl!Arthur/girl!Merlin - G - ~1k - WARNING: femslash!]
Author's Summary: Five necessary facts about Arthur.
Why I rec this: It intrigued me that this fic had Arthur and Merlin as girls. What makes it outright brilliant is that it lacks the usual over emphasized feminisation that I initially expected. Arthur is dressing as a man whenever she can and finds her own way in the world against the will of her father.
Excerpt:
The first thing you need to know about Princess Arthur is that, no, it is not her name. Of course it isn’t, the masculinity inherent in such a name at odds with the velvet of her demure court dresses, but it is the name she answers to when her father isn’t watching over her with hawk eyes.