Toxic GLs:
https://www.mangago.zone/read-manga/gunjou/
https://www.mangago.zone/read-manga/outro/
https://www.mangago.zone/read-manga/hone_no_nazuki_made_aisu/
https://www.mangago.zone/read-manga/seasons_in_bloom/
https://www.mangago.zone/read-manga/the_chain_of_youth/
https://www.mangago.zone/read-manga/your_fetters/
https://www.mangago.zone/read-manga/zenbu_kowashite_jigoku_de_aishite/
https://www.mangago.zone/read-manga/savior/
https://www.mangago.zone/read-manga/my_brother_and_i_are_rivals/
https://www.mangago.zone/read-manga/on_a_leash/
https://www.mangago.zone/read-manga/black_white_sal_jiang/
https://www.mangago.zone/read-manga/officer_you_can_no_longer_hide_your_tail/
https://www.mangago.zone/read-manga/i_m_more_dangerous_than_you/
https://www.mangago.zone/read-manga/manipulate_my_heart/
https://www.mangago.zone/read-manga/indulging_a_crazy_beauty/
https://www.mangago.zone/read-manga/i_love_amy/
https://www.mangago.zone/read-manga/the_barefoot_nina/
https://www.mangago.zone/read-manga/serenade_keum_kyesoo/ (age gap;toxic relationship between FL and yandere side character)
https://www.mangago.zone/read-manga/chirizokonai_no_hiraeth/ (suicide and suicidal ideation)
https://www.mangago.zone/read-manga/our_love_is_disgusting/ (age gap)
https://www.mangago.zone/read-manga/kill_me_now/ (age gap)
https://www.mangago.zone/read-manga/ubai_ai/
https://www.mangago.zone/read-manga/the_nest_of_eternity/ (age gap, non-con)
https://www.mangago.zone/read-manga/immoral_parody/ (age gap, non/dub-con)
https://www.mangago.zone/read-manga/my_girlfriend_s_not_here_today/ (adultery)
https://www.mangago.zone/read-manga/love_thy_neighbor_2/ (adultery)
https://www.mangago.zone/read-manga/utsushicha_dame_na_kao/ (BDSM, dub-con)
https://www.mangago.zone/read-manga/yodaka_meguru/ (adultery)
https://www.mangago.zone/read-manga/warikitta_kankei_desukara/ (teacher-student relationship)
Doomed yuri:
https://www.mangago.zone/read-manga/oniisama_e/
https://www.mangago.zone/read-manga/to_die_in_june_one/ (read the last two chapters here: https://www.mangago.zone/read-manga/to_die_in_june/)
https://www.mangago.zone/read-manga/living_will/
https://www.mangago.zone/read-manga/huijin_huayuan/
https://www.mangago.zone/read-manga/a_story_concerning_sweets/
https://www.mangago.zone/read-manga/yume_no_hashibashi/
https://www.mangago.zone/read-manga/tower_of_campanella/
https://www.mangago.zone/read-manga/brides_of_iberis/
https://www.mangago.zone/read-manga/composing_spring_in_this_room_where_cherry_blossoms_bloom/
https://www.mangago.zone/read-manga/kimi_to_tsuzuru_utakata/
https://www.mangago.zone/read-manga/kitanai_kimi_ga_ichiban_kawaii/ (toxic relationship, features some extreme fetishes such as age regression/babyplay, vomit kink, period blood kink, etc.)
https://www.mangago.zone/read-manga/this_love_that_won_t_reach/ (age gap, MC is in love with her sister-in-law; rushed and ambiguous ending)
https://www.mangago.zone/read-manga/kimi_ga_shinu_made_koi_wo_shitai/ (on-going;doomed side couple and possible doomed main couple)
https://www.mangago.zone/read-manga/haru_and_midori/ (MC had doomed one-sided feelings for the second MC's mother)
https://www.mangago.zone/read-manga/a_monster_wants_to_eat_me/ (on-going; possible doomed yuri)
https://www.mangago.zone/read-manga/the_story_of_a_person_who_grew_a_flower/ (short story; age gap, teacher-student relationship;hanahaki disease)
https://www.mangago.zone/read-manga/final_film/ (short story)
https://www.mangago.zone/read-manga/avalon_bitter_anthology/ (one-shot anthology)
https://www.mangago.zone/read-manga/shiroi_heya_no_futari/ (one-shot)
https://www.mangago.zone/read-manga/141108/ (one-shot)
https://www.mangago.zone/read-manga/aliens/ (one-shot)
https://www.mangago.zone/read-manga/the_story_of_the_princess_and_the_little_mermaid/ (one-shot)
https://www.mangago.zone/read-manga/a_bud_in_secret/ (one-shot)
https://www.mangago.zone/read-manga/saudade_ni_kuchidzukete/ (one-shot)
https://www.mangago.zone/read-manga/efude_to_kurokinu/ (one-shot; toxic relationship, cheating)
https://www.mangago.zone/read-manga/you_are_my_soulmate/ (two-part one-shot; omegaverse;ambiguous ending)
Oml thank you sm
Toxic or doomed Yuri recs? ヾ(❀╹◡╹)ﾉ~