You can search the tag 3p or poly but most are non labeled relationships so here's some where they actually date/are in love(all are one bottom two tops)
https://www.mangago.zone/read-manga/aisare_neko_wo_hantoubun/
https://www.mangago.zone/read-manga/lick_me_like_me/
https://www.mangago.zone/read-manga/aisaretagari_no_gemini/
https://www.mangago.zone/read-manga/double_beastly_trouble/
https://www.mangago.zone/read-manga/high_key_x_low_key/
https://www.mangago.zone/read-manga/there_s_no_way_this_is_fate/
The mileage varies, but these are the only 3p/poly ones I’ve read/know about.
I wanna die before I’m 30
https://www.mangago.zone/read-manga/i_wanna_die_before_i_m_30/
Nuretoro3p
https://www.mangago.zone/read-manga/nuretoro3p/
Ai to Makoto
https://www.mangago.zone/read-manga/ai_to_makoto_moriyo/
A Dead Crow's Stare
https://www.mangago.zone/read-manga/a_dead_crow_s_stare/
Hi! I randomly wondered if their were any bl's focused on 3 guys?? I've seen love triangles but they usually end up making me frustrated, I thought it'd be interesting to read something poly (?)
Pls