five semi-random fics from my bookmarks and author subscriptions:

fics:
ghost of a chance zosan, 'sanji haunts zoro as a ghost', really really good. the intro of this always kills me every time, it's so perfectly emotionally devastating as it should be. the ending, too. man

beneath the ocean's waves zosan, all of hazel's stuff is really good, but this one is my go-to like, airplane fic for a very good reason. the slow building relationship and the absolutely stunning final battle and reveal. im a sucker for a good zeff and sanji reunion moment too and man does it deliver

you, drowning between my arms my ideal usopp/sanji, AND an absolutely hilarious timeloop. there's something so fun about 'time loop from the perspective of a guy who's not in the time loop at all', and sanji losing his mind in this is like great to see

mutiny gen, mostly monster trio. oh my goddd, this fic. this fic being set as one argument turned reveal is done so well, with the set up (luffy declaring that zoro's committed mutiny) being so shocking but so well unraveled over the fic. emotionally perfect, and just the way everything pieces together by the end... think about this one a lot

blood of the covenant like, quintessential zeff and sanji fic to me. the bookends on this one are soooo good every time

authors:
resacon1990 has a huge selection of z/s fic and they always hit this really lovely, tender note of affection. it gets so hard to breath (when you're looking at me) has this absolutely wonderful conversation between usopp and zoro that sticks in my brain forever

zephgale has just a really wonderful selection of sanji fic. the slow reveal of the series of events in stigma is perfect and heartbreaking in how it's slowly unraveled, and the ending is very sweet

blasphemyandtheboys really stellar emotional character writing, it's always just the right amount of pain and catharsis. bite the hand is really, really good and my ideal kind of whump/hurt/comfort

pheenick's works are consistently hilarious in just this pitch perfect, pre-ts one piece way that gets me every time. bark bark bark is an absolute riot of a fic (zoro and sanji meet pre-series. sanji is perfect in this), as is you are not immune

taizi has sooo much good one piece gen fic