okay tbh all of chn poly pairings are rare ship, including verkwanchan so i share those too! i still missed a lot of great poly chn fics but these are some of my favs! you can check out my bookmark for more recs!
one-shot:

junchanseoksol, cutest fucking thing everrrrr, just boyfriends being boyfriends, you should read this to feel happy: https://archiveofourown.org/works/56552839

verkwanchan, fluff, childhood friends to lovers, vamp!vn, oblivious!chn, sk losing his mind - https://archiveofourown.org/works/44287090

verkwanchan, angst, hurt/comfort, established, verkwan, getting together, friends to lovers - https://archiveofourown.org/works/48389788

verchanhao, prince chn, bodyguards verhao, violence and minor character death - https://archiveofourown.org/works/28662168

seokverchan, fluff, slice of life, ambiguous relationship but very sweet - https://archiveofourown.org/works/44827579

wonchanhan, time travel au, implied sexual content - https://archiveofourown.org/works/22961341/chapters/54887773

wonboochan, superhero, supervillain au, established wonwboo, getting together - https://archiveofourown.org/works/49866814

boochanhoon,getting together, asexual chnhoon, coming out as asexual, very mild hurt/comfort, very sweet too! - https://archiveofourown.org/works/44679031

verkwanchan, 🔞, established verchn and boo, chn in crop top, threesomes <3 - https://archiveofourown.org/works/53063293

Wonchanhoon, 🔞, omegaverse + cisswap so it’s girlcock and boypussy!!!, boypussy chnnie <3 - https://archiveofourown.org/works/56814493

wonchanhoon, 🔞 cisswap, established chnhoon and girl loser ww, polyamory negotiations: https://archiveofourown.org/works/54675364

cheolchanhoon ,🔞, cisswap, established jicheol, threesome, https://archiveofourown.org/works/40212330

wonchancheol ,🔞,omegaverse, omega chn, alphas woncheol, bees - https://archiveofourown.org/works/5241829

wonchancheol, 🔞, married woncheol and the pretty thing they picked up chn <3, a smidge of daddy kink - https://archiveofourown.org/works/28453410#main

no flex zone, 🔞, omegaverse, alpha!chn but they’re fucking him into omega - https://archiveofourown.org/works/51876829

bss/chn, 🔞, omegaverse, omega chn, first time bottoming, tenderhorny seokchn - https://archiveofourown.org/works/53128186

96z/chan, 🔞, cisswap, kitten chn, mommy kink, emotional manipulation - https://archiveofourown.org/works/53391229

Minwonchan, 🔞, polyamory, power bot chn, sub top mg, bdsm, brat chn - https://archiveofourown.org/works/52410613

soonwoochan, 🔞,omegaverse, established r/ship, pregnant omega chn, beta sy, alpha ww - https://archiveofourown.org/works/53015902

jeongcheolchan, 🔞, established jeongcheol, past!yoonchan, developing relationship, getting back together, threesome!! Jeongcheol and the pretty little thing they picked up: https://archiveofourown.org/works/38292283

minwonchan, 🔞, established minwon, friends to lovers, roommates, chn gets dp-ed by his crushes: https://archiveofourown.org/bookmarks/1382593108

Wonchansol, 🔞, threesome, this is just porn hehehehe, established relationship + background ot13, dom!ww with subs!verchan: https://archiveofourown.org/works/19753108

cheolgyuchan, 🔞, pwp, threesome and open relationship: https://archiveofourown.org/works/36305755

minwonchan, 🔞, challengers au, volleyball players minwon, slutty chn: https://archiveofourown.org/works/59488021

minwonchan, friends to lovers, magical realism au, vampires, a little angsty but very very cute! - https://archiveofourown.org/works/56627311

wonchanboo, supervillain/superhero au, getting together, established wonboo - https://archiveofourown.org/works/49866814

jangtoco, 🔞, college au, teacher-student r/ship, power imbalance, based on maestro gose hehe - https://archiveofourown.org/works/56281528

jangtoco, 🔞, college au, sequel to the other jangtoco, established relationship - https://archiveofourown.org/works/59874313

junchanhoonhao, 🔞, established relationship, lowkey cute, but also horny, chn wanting jhoon to be gentle with him: https://archiveofourown.org/works/58629358

chaptered:
verkwanchan, established verkwan , poly negotiation, baby au, found family - https://archiveofourown.org/works/26497801/chapters/64577134

verkwanchan, friends to lovers, poly negotiations, baby au again <3 - https://archiveofourown.org/works/33363292/chapters/82861240

pfu poly, hybrid/soulmates au, cat hybrids haochan, humans soonhui, angst with a happy ending, established soonhuihao - https://archiveofourown.org/works/38119999/chapters/95227201

wonchancheol, angst with happy ending, poly negotiations, organized crime au - https://archiveofourown.org/works/44762809/chapters/112623604

wonchancheol, demons au series, demons woncheol, human!chn - https://earchiveofourown.org/series/1561462

wonhuichan, pwp with minimal plot, the reason why i like wonhuichan btw, brat chn, menace junnie <3 and suffering ww - https://archiveofourown.org/works/43282513/chapters/108793996

ongoing chaptered:

junchanhao, omegaverse, omega!chn, alpha!jun, omega!hao??, figuring things out, angstyyyy with happy ending - https://archiveofourown.org/works/50758138/chapters/128221813

minwonchan, science fiction au, very angsty and very good - https://archiveofourown.org/works/52628668/chapters/133121896