Honestly I don't remember how "hardcore" they are, but try these:
https://www.mangago.me/read-manga/sadistic_beauty_side_story/
https://www.mangago.me/read-manga/marie_and_alex/
https://www.mangago.me/read-manga/sunstone_1/
https://www.mangago.me/read-manga/lilith_sirius/ (SEQUEL: https://www.mangago.me/read-manga/lilith_2/)
https://www.mangago.me/read-manga/toy_xx_box/
https://www.mangago.me/read-manga/i_adore_you_teacher_official/
https://www.mangago.me/read-manga/addictive_bing_zi/
https://www.mangago.me/read-manga/program_me/
https://www.mangago.me/read-manga/talk_dirty_to_me/
https://www.mangago.me/read-manga/only_to_you/
https://www.mangago.me/read-manga/pathetic_sunbae/ (dub-con)
https://www.mangago.me/read-manga/hottie_s_heel_uncensored/ (one-shot)
i love you so much this will really fuel my creativity!!!ヾ(❀╹◡╹)ﾉ~
guys please i NEEEED hardcore bdsm fdom yuri i’ll take anything… i don’t care how dangerous or uncomfortable or taboo or rough it is just please （/TДT)/