This has only one chapter FOR NOW but its definitely a cute 3p :>
http://www.mangago.zone/read-manga/ai_o_ataeru_kemonotachi/
You can also read the novel:
https://www.novelupdates.com/series/ai-o-ataeru-kemono-tachi/
http://www.mangago.zone/read-manga/i_wanna_die_before_i_m_30/ - probs my fave 3p
https://www.webtoons.com/en/challenge/boyfriends/list?title_no=433411 - this is also pretty good
http://www.mangago.zone/read-manga/welcome_to_the_yaoi_research_club/
http://www.mangago.zone/read-manga/there_s_no_way_this_is_fate/
http://www.mangago.zone/read-manga/ai_to_makoto_moriyo/
Agreed, most 3p/poly labelled mangas are like that tho which might be the reason why I don't really enjoy most stories focusing on poly cause it's more like tolerating & sharing instead of really being in love with each other ( ̄∇ ̄")
But maybe I shouldn't really say anything about it cause I wouldn't want a poly relationship so who am I to talk about how it should work ╮( ̄▽ ̄)╭
its still poly as long as its with informed consent of the other partners~
i've been in a poly relationship before so i kind of want to see more authors/mangakas who are also open to the topic ^^
anw, its fine~ i just hope people could be understanding of the poly world instead of just giving them a bad name~^^
I get where ya coming from (▰˘◡˘▰)
You might also like this since it's also more of an open-relationship
http://www.mangago.zone/read-manga/namae_mo_shiranai_machiawase/

any cute 3p/poly mangas out there????
i only know "hugo" and "lick me, like me"~