These are all GLs:
https://www.mangago.zone/read-manga/her_shimcheong/
https://www.mangago.zone/read-manga/blooming_sequence/
https://www.mangago.zone/read-manga/straight_girl_trap/
https://www.mangago.zone/read-manga/crescent_moon_and_doughnuts/
https://www.mangago.zone/read-manga/my_princess_charming/
https://www.mangago.zone/read-manga/tsukuritai_onna_to_tabetai_onna/
https://www.mangago.zone/read-manga/exciting_feelings/
https://www.mangago.zone/read-manga/kono_koi_wa_hoshi_ni_wa_negawanai/
https://www.mangago.zone/read-manga/long_awaited_feelings/
https://www.mangago.zone/read-manga/tsumetakute_yawaraka/
https://www.mangago.zone/read-manga/ayaka_chan_wa_hiroko_senpai_wo_otoshitai/
https://www.mangago.zone/read-manga/a_joyful_life/
https://www.mangago.zone/read-manga/dallaeya/
https://www.mangago.zone/read-manga/listening_to_the_stars_bbl_scans/
https://www.mangago.zone/read-manga/the_love_doctor/
https://www.mangago.zone/read-manga/half/
https://www.mangago.zone/read-manga/shine_on_you/
https://www.mangago.zone/read-manga/2dk_g_pen_mezamashi_tokei/
https://www.mangago.zone/read-manga/still_sick/
https://www.mangago.zone/read-manga/i_decided_to_offer_myself_to_motivate_senpai/
https://www.mangago.zone/read-manga/universe_s_most_jealous_goddess/
https://www.mangago.zone/read-manga/childhood_sweetheart_liaoliao/
https://www.mangago.zone/read-manga/isekai_picnic/
https://www.mangago.zone/read-manga/ring_my_bell/
https://www.mangago.zone/read-manga/teiji_ni_agaretara/
https://www.mangago.zone/read-manga/happiness_rides_a_broomstick/
uhhh a more slow burn yet mature romance although NOT porn (bl/gl/bg) that that doesn't take place in like high school im too old to enjoy ts lol. also no historical