Been a while since I've read these, but I think they're all pretty wholesome (these are all GLs btw)
https://www.mangago.me/read-manga/goukaku_no_tame_no_yasashii_sankaku_kankei_nyuumon/
https://www.mangago.me/read-manga/there_s_weird_voices_coming_from_the_room_next_door/
https://www.mangago.me/read-manga/luminous_blue/
https://www.mangago.me/read-manga/watashi_no_shumi_tte_hen_desu_ka/
https://www.mangago.me/read-manga/beast_knights/
https://www.mangago.me/read-manga/kimi_no_love_wo_misetekure/ (I haven't read this one, but this was a love triangle situation [girl A loves boy, boy loves girl B, girl B loves girl A] that ended in a poly relationship, but I'm not sure if they're all in love with each other or just two people sharing the same girlfriend)
I owe you my life
THANKSSSSS(づ￣ ³￣)づ
PLEASSEEEEE im begging for some wholesome, fluffy and polyamorous bl/gl （/TДT)/