There are several places you can look. AO3 is a great start as it has a wide range of fanfics and a good search function. You can type in the title 'into the grey mists fem harry fanfic' and see if it pops up. Fanfiction.net is another option. Additionally, some smaller fanfic aggregators might also have it. However, you need to be cautious of the legality and the quality of the content on some of these smaller sites. You can also try reaching out to Harry Potter fanfic enthusiasts on social media platforms like Tumblr or Reddit. They might be able to point you in the right direction.
I'm not sure specifically as I haven't read this particular 'fem Harry' fanfic. But generally, 'fem Harry' fanfics often reimagine the Harry Potter story with the main character as a female. 'Into the grey mists' might be about the character's journey into some mysterious or unknown areas, perhaps involving magic, adventure, and self - discovery in a world full of magic and danger.
Fem Harry in these fanfics usually has a distinct personality. She might be more nurturing, for instance, taking care of younger students at Hogwarts more often. Her magical abilities may also be presented in a different light. Some fanfics show her having an affinity for certain types of magic that the male Harry didn't, like a special connection to nature - based spells. Her social interactions are different too. She could be more involved in the female - centric groups at Hogwarts, which in turn can influence the overall plot as she brings different perspectives and ideas from those groups into the main story.
A common theme is self - discovery. Harry Grey often has to figure out his true identity or his unique place in the magical world. Another theme is friendship, like the bonds he forms with other characters. Adventure is also common, as he goes on quests or explores new places.
One common theme is friendship evolving into something more. Maybe the fem reader starts off as a friend to Jean Grey in the X - Men world, and then they gradually develop deeper feelings for each other.
It could be Draco's female counterpart. In this fanfic, she might be just as competitive and haughty as Draco. She would see Fem Harry as a threat to her own status as the top athlete in their school or in their magical sports league. And she would constantly try to undermine Fem Harry's efforts, whether it's by spreading rumors or trying to get her disqualified from competitions.
I don't think 'fem harry abused fanfic' is a common type. While there are many diverse fanfics out there, ones that involve such a dark and specific theme like a female Harry being abused are likely in the minority. Most fanfics tend to focus on more positive or at least less disturbing themes like romance, friendship, or alternate adventures within the Harry Potter universe.
Power and responsibility. As Harry becomes the Grey Lord, he has to deal with new powers and the duties that come with it.
One great 'funny grey' Harry Potter fanfic could be 'The Misadventures of Grey - Haired Harry'. It has Harry in some rather comical situations where his hair turns grey prematurely due to a spell gone wrong. Another one might be 'Grey - Day at Hogwarts' which is full of humorous moments as Harry tries to navigate through a Hogwarts that has turned grey for some mysterious reason. And there's also 'Grey - Eyed Harry's Pranks' where Harry uses his new - found grey - eyed powers in the most hilarious ways.
There might be some fan - created works out there that blend elements of 'Fifty Shades of Grey' with Harry Styles. However, it's important to note that such fanfics may not be endorsed by either the creators of 'Fifty Shades of Grey' or Harry Styles himself. Also, make sure to abide by the rules and ethics of the fanfic communities when looking for such content.
I'm not entirely sure as the term 'futanari' involves adult and inappropriate content. We can focus on a more general 'fem Harry' fanfic which could be about a female version of Harry in various fictional scenarios like in a magical adventure, facing challenges in a new world, or having unique relationships with other characters.