It’s not on here but there’s a WEBTOON called boyfriends with a wholesome poly relationship between 4 guys here’s the link https://m.webtoons.com/en/challenge/boyfriends/list?title_no=433411
Boyfriends is underrated and Good! Wholesome
I'd say Choco Strawberry Vanilla falls under this
Yeah it definitely fits the bill, imma link it here: http://www.mangago.zone/read-manga/choco_strawberry_vanilla/
Plz reccomend bl yaoi with a poly relationship like there are multiple ppl who are dating eachother