After browsing through my lists this is what I found I know there are more cause I got some flashes but this is the only thing I found that mangago left me so…
The Feisty omega and his twin mates
Profundis (ends in solo I think, I don’t remember )
Single not ready to mingle
Lick me like me
Ai to makoto
Isn’t Lick me like me one uke with two semes? But it’s been years since I read it. I just swear I remember one uke and two seme’s unless it’s side couple. But I want main.
The feisty omega and his twin mates are all uke and tops.
I think you misunderstood and read the post as uke and Mang semes
Same with single not ready to mingle (I think) and profundis is heavily rape harem with multiples seme, one uke.
Here’s some stories of a Seme with multiple Ukes!
https://www.mangago.me/read-manga/authentic_hypnosis_app/
https://www.mangago.me/read-manga/twink_tops_office_harem_rape_king_edition_cupid_scans/
https://www.mangago.me/read-manga/lapirosa_at_the_museum/
That's what I'm talking about. There's no PROPER BL with Seme/Top protagonist having 2 or more bottom/uke. If it did happened, it just went into full pay gorn without plot! (Not proper "romance", at least those BL with harem uke getting fucked by 3-4 tops they still got story line and progress not just pay gorn).

Like can we have HAREM SEME. I mean Seme with 2 uke (and they get along). If usually Harem Uke can fuck 4 Top/seme why can't we have Harem Seme? Ughhh that proper harem seme troupe is way too rare (it might NOT EXIST)