This is late and you may have read them already but this artist does a lot of taboo relationships
https://www.mangago.zone/read-manga/dear_crazy_monster/
Half brothers
https://www.mangago.zone/read-manga/kawaikunai_aniki_o_aegasu_houhou/
& its sequel
https://www.mangago.zone/read-manga/namaiki_na_otouto_wo_itooshimu_houhou/
Adoptive brothers but it’s really funny how insane the relationship is
Ur welcome I love to help! I also just remembered this series. I hope you like it if you haven’t read it already too
https://www.mangago.zone/read-manga/sexual_harassment_brothers/
&
https://www.mangago.zone/read-manga/sekuhara_brothers_adult_hen/
They’re step brothers but they’re also blood related (cousins)
Very ridiculous and graphic and I love it
SHUT THE FUCK UP ABOUT TRUMP.....
.....and recommend me some good brother/brother yaoi instead!
Got some good recs last time I asked, still looking for more! Huge bonus if they are ACTUAL brothers instead of stepbros/adopted/whatev. NO omegaverse.