oof i'm terrible at picking favs so i'm gonna limit this to completed works to make it a bit easier, not putting descriptions but added the urls so you can look for yourself. in no specific order:

Trials & Titillations by Callunar (https://archiveofourown.org/works/50914435) - this is one of the first genderbend fics i've read that i actually liked, it's such a fun read and i absolutely love the characterization

Tea'sing All The Way Through by Camafeu (https://archiveofourown.org/works/19360531) - this fic is pretty emotionally intense and i read it fairly recently but it hit me in a really vulnerable spot and i think about it all the time

let the tides carry you back to me by sweetdd (https://archiveofourown.org/works/53136379) - i have a hard time articulating the way i love this fic because it's such a specific feeling to me, but there is such love and tenderness even in the bits of internal turmoil and i keep coming back to it

Fatal Attraction by Nekerb (https://archiveofourown.org/works/9840179) - mutually unhinged/toxic lawlu my beloved...they're serial killers in this one, the plot is super interesting, but MIND THE TAGS it gets pretty graphic so if you can't stomach detailed gore this one might not be for you

Boyfriend's Duties by martilla (https://archiveofourown.org/works/41524560) - just a joy to read really. the relationship progression and the conflict feels very realistic for law and luffy and while sometimes my interest will admittedly waver with these kinds of fics this one easily kept my attention the whole time