hm, i love this troupe buy i feel like you've seen most of these:
1. There's no way this is fate (this one has a sequel, AND THIS IS MY FAVE LIKE I LOVE LOVE THIS ONE LOL, if u haven't seen this go check it out)
2. Eunsoo's Good day (manhwa)
3.Futari No Musuko Ni Nerawarete Imasu (borderline incest(NOT), tho i suggest not reading it if you're looking for something more serious)
4. I wanna die before I'm 30
5. Nuretero 3p
6. Welcome to the Yaoi research club.
7. Aisaretagari No Gemini (I LOVE THIS ONE TOO OMG)
8. Trick Turned Into a Threesome With the Tachibana Brothers
9. Aisare Neko wo Hantoubun
10. Tachi to Neko Docchi ga Ii no?
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this is in no particular order but i suggest just going through any 3p tags (other words related to it)
Bless you
I'm looking for polyamorous BLs, NOT love triangles but more like a three people relationship