These are mostly threesome. I've read some ages ago so I forgot in which chapters it's there. So enjoy
http://www.mangago.zone/read-manga/suna_no_shita_no_suimyaku/
http://www.mangago.zone/read-manga/yoiko_no_sumu_machi/
http://www.mangago.zone/read-manga/ikenai_otoko/
http://www.mangago.zone/read-manga/midare_somenishi_dj_adesugata_emaki/
http://www.mangago.zone/read-manga/uta_no_prince_sama_dj_retake/
http://www.mangago.zone/read-manga/sex_therapist/
http://www.mangago.zone/read-manga/seikaku_warui_uke_ga_guzuguzuni_nakasareru_hon/
http://www.mangago.zone/read-manga/satou_kun_ni_wa_kanawanai_sachimo/
Or you can check out this list
http://www.mangago.zone/home/mangalist/290484/
Hope it helps
there's a lot! thank you so much (≧∀≦)
well, this isn't exactly something that would blow you away. could even make you cringe btw if this thing isn't up your alley but for me, i love some adorable stuff and even if that stuff is stupid and dumb, I can still tolerate it if it's not too annoying (for me at least). after all, i did enjoyed the threesome, been missing it cus I know poly relationship isn't easy to pull off.
that being said, can anybody recommend me any good bl with poly? i missed them so much. tho if you have none, then it's okay (=・ω・=)