https://www.mangago.me/read-manga/canis/
the third story “The Speaker” is a throuple and starts on chapter 19 but it’s still updating
High Key x Low Key, Eunsoo's Good Day, Inkya na Boku ga Futago ni Aisareru Wake, Beta Count Has Changed, Aisare Neko wo Hantoubun, Bed for Three, Nuretoro 3P: Otona no Omocha Monitor, Ai wo Ataeru Kemonotachi, I Wanna Die Before I'm 30, Onihebi Kyuai Monogatari, Welcome to the Yaoi Research Club, Do You Wanna Be a Top or a Bottom?, Rooming with My Two Lovers, Dekiai Boyfriend, The Twins and Me, Bokura no Kawaii Asahi-Kun, Aisaretagari no Gemini, Futarijime Underdog, 3P Nonke Kaihatsu -Elite Futari ni Nerawareta Ore-.
Except for 2-3 titles, all the others are completed.
Hello! I'm looking for Thruple/Poly BL, please help me.