https://www.mangago.me/read-manga/cosmic_boy/ (Angsty but happy ending)
https://www.mangago.me/read-manga/ashita_wa_docchi_da/ (SO GOOD SO GOOD SO GOOD)
https://www.mangago.me/read-manga/ore_no_kirai_na_senpai/
https://www.mangago.me/read-manga/junketsu_drop/ (I think so, it's been awhile so I forgot)
https://www.mangago.me/read-manga/boku_o_warui_ko_ni_shite/ (tw//rape)
https://www.mangago.me/read-manga/false_memories_lee_gpiee/ (kind of, it's more complicated. BUT STILL REALLY GOOD)
https://www.mangago.me/read-manga/itonaga_kun_no_koi_no_ito/ (Seme used to be a tsundere until he hurts the uke and tries to make it up)
please recommend BLs with tsundere semes~ thank you <3<33