https://www.mangago.me/read-manga/gunjou/ (peak fucked-upness)
https://www.mangago.me/read-manga/hone_no_nazuki_made_aisu/
https://www.mangago.me/read-manga/seasons_in_bloom/
https://www.mangago.me/read-manga/the_chain_of_youth/
https://www.mangago.me/read-manga/your_fetters/
https://www.mangago.me/read-manga/zenbu_kowashite_jigoku_de_aishite/
https://www.mangago.me/read-manga/savior/
https://www.mangago.me/read-manga/i_love_amy/
https://www.mangago.me/read-manga/the_barefoot_nina/
https://www.mangago.me/read-manga/my_brother_and_i_are_rivals/
https://www.mangago.me/read-manga/on_a_leash/
https://www.mangago.me/read-manga/black_white_sal_jiang/
https://www.mangago.me/read-manga/officer_you_can_no_longer_hide_your_tail/
https://www.mangago.me/read-manga/i_m_more_dangerous_than_you/
https://www.mangago.me/read-manga/manipulate_my_heart/
https://www.mangago.me/read-manga/kill_me_now/
https://www.mangago.me/read-manga/serenade_keum_kyesoo/ (toxic relationship between FL and side character)
https://www.mangago.me/read-manga/chirizokonai_no_hiraeth/ (suicide and suicidal ideation)
https://www.mangago.me/read-manga/my_girlfriend_s_not_here_today/ (adultery)
https://www.mangago.me/read-manga/our_love_is_disgusting/ (age gap)
https://www.mangago.me/read-manga/naraku_no_hanazono/ (incest and child sexual abuse [not between MC and FL], abortion)
https://www.mangago.me/read-manga/love_thy_neighbor_2/ (age gap, adultery, mild religious themes)
https://www.mangago.me/read-manga/the_nest_of_eternity/ (short story;age gap, non-con)
https://www.mangago.me/read-manga/immoral_parody/ (short story;age gap, non/dub-con)
https://www.mangago.me/read-manga/kitanai_kimi_ga_ichiban_kawaii/ (features some extreme fetishes and graphic content)
https://www.mangago.me/read-manga/outro/ (short story; cheating, domestic violence)
https://www.mangago.me/read-manga/efude_to_kurokinu/ (one-shot; adultery)
THANK YOU SOOO MUCH!!!
well written toxic gl recs please