Responses
https://www.mangago.me/read-manga/stock/ (prequel of Slow Morning)
https://www.mangago.me/read-manga/shiro_no_koro/
https://www.mangago.me/read-manga/oreshika_shiranai_karada/
https://www.mangago.me/read-manga/reincarnation_idol_idol_freak_night/
https://www.mangago.me/read-manga/don_t_call_me_dirty/ (chapters deleted, u can read on mangafire)
https://www.mangago.me/read-manga/kamikudaite_aio_oshiete/ (I think this count..? Mc was almost fine just being sex partner when ml has rut)
BL mc is aware of their feelings and aren't ashamed of it or even try to hide it, they just accept it and think their feelings won't be reciprocated but they're fine with that.