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here are some!
https://www.mangago.zone/read-manga/confession_2/
https://www.mangago.zone/read-manga/there_s_no_way_this_is_fate/
https://www.mangago.zone/read-manga/double_beastly_trouble/
https://www.mangago.zone/read-manga/high_key_x_low_key/
https://www.mangago.zone/read-manga/ai_o_ataeru_kemonotachi/
https://www.mangago.zone/read-manga/him_him_him/
all bl except the last one :) it's a small niche so i wish i could find some good ones :/ dont think ive ever read a poly novel though
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First one that comes to mind is Harekon
https://www.mangago.zone/read-manga/hare_kon/
any recs for poly relationship (manga manhwa novel book whatever !!!) i feel like ive read most of the popular and good ones already :(