Some are more medium-burn, and some feature mutual feelings but it takes some time for them to get together:
https://www.mangago.me/read-manga/koi_yori_aoku_oneshot/
https://www.mangago.me/read-manga/her_mountain_her_ocean/
https://www.mangago.me/read-manga/my_angel_childhood_friend_was_a_gal_when_we_met_again/
https://www.mangago.me/read-manga/listening_to_the_stars_bbl_scans/
https://www.mangago.me/read-manga/she_is_still_cute_today/
https://www.mangago.me/read-manga/i_favor_the_villainess/
https://www.mangago.me/read-manga/ouji_sama_nante_iranai/
https://www.mangago.me/read-manga/bai_lijin_among_mortals/
https://www.mangago.me/read-manga/the_magical_revolution_of_the_reincarnated_princess_and_the_genius_young_lady/
https://www.mangago.me/read-manga/odoriba_ni_sukaato_ga_naru/
https://www.mangago.me/read-manga/the_moon_on_a_rainy_night/
https://www.mangago.me/read-manga/crescent_moon_and_doughnuts/
https://www.mangago.me/read-manga/please_bully_me_miss_villainess/
https://www.mangago.me/read-manga/our_yuri_started_with_me_getting_rejected_in_a_dream/
https://www.mangago.me/read-manga/how_do_i_get_together_with_my_childhood_friend/
https://www.mangago.me/read-manga/the_heart_of_the_thorns/
https://www.mangago.me/read-manga/kono_koi_wa_hoshi_ni_wa_negawanai/
https://www.mangago.me/read-manga/wicked_spot/
https://www.mangago.me/read-manga/yearning_for_a_night_full_of_you/
https://www.mangago.me/read-manga/tsumugi_chan_wants_to_make_seto_san_laugh/
https://www.mangago.me/read-manga/indulging_a_crazy_beauty/
https://www.mangago.me/read-manga/summer_trend/
https://www.mangago.me/read-manga/kimi_ga_hoeru_tame_no_uta_wo/
https://www.mangago.me/read-manga/oni_ure_idol_ga_kyou_mo_watashi_wo_oshitekuru/
https://www.mangago.me/read-manga/dark_mermaid/
https://www.mangago.me/read-manga/adachi_to_shimamura/ (read this on another site tbh the order's all messed up and chapters are missing)
https://www.mangago.me/read-manga/the_two_sides_of_seiyuu_radio/
https://www.mangago.me/read-manga/mietemasu_yo_aizawa_san/
https://www.mangago.me/read-manga/koroshi_korosare_sankaku_kankei_ni_watashi_ga_ima_kara_hairun_desu_ka/
https://www.mangago.me/read-manga/hitokiri_shoujo_koushaku_reijou_no_goei_ni_naru/
https://www.mangago.me/read-manga/shy_na_ano_ko_ni_natsukaretai/
https://www.mangago.me/read-manga/unnie_i_like_you/
https://www.mangago.me/read-manga/shuu_ni_ichido_classmate_wo_kau_hanashi/
https://www.mangago.me/read-manga/futsuu_to_bakemono/
https://www.mangago.me/read-manga/kimi_ga_shinu_made_koi_wo_shitai/
https://www.mangago.me/read-manga/sherbet_above_the_sea_of_fog/
https://www.mangago.me/read-manga/the_noble_lady_on_the_edge_of_the_cliff_wants_to_make_the_dark_knight_fall_in_love/
https://www.mangago.me/read-manga/tsumetakute_yawaraka/
https://www.mangago.me/read-manga/school_zone_ningiyau/
https://www.mangago.me/read-manga/perfect_heroine_wants_to_possess_me_bbl_scans/
https://www.mangago.me/read-manga/the_fed_up_office_lady_wants_to_serve_the_villainess/
https://www.mangago.me/read-manga/the_guy_she_was_interested_in_wasn_t_a_guy_at_all/
https://www.mangago.me/read-manga/a_monster_wants_to_eat_me/
https://www.mangago.me/read-manga/do_you_think_someone_like_you_could_defeat_the_demon_lord/
https://www.mangago.me/read-manga/gal_maid_villainess_only_milady_s_happy_end_will_win/
https://www.mangago.me/read-manga/futsuu_no_koitte_nani/
https://www.mangago.me/read-manga/twinstar_cyclone_runaway/
https://www.mangago.me/read-manga/convenient_semi_friend/
https://www.mangago.me/read-manga/a_white_rose_in_bloom/
https://www.mangago.me/read-manga/shoujo_manga_protagonist_x_rival_san/
wow that's a lot. I've read few of these but that's a lot to get thru. thanks mate!
gimme your slowest burn yuri/shoujo ai