You can use top/bottom or tachi/neko instead for GLs, anyway these are all yuris with a black-flag top:
https://www.mangago.me/read-manga/kill_me_now/
https://www.mangago.me/read-manga/tatoe_sekai_ga_owattemo_watashi_wa_kanojo_wo_erabanai/
https://www.mangago.me/read-manga/i_m_more_dangerous_than_you/ (age gap, teacher-student relationship but both leads are 18+, bullying and harassment, kidnapping and confinement, domestic violence)
https://www.mangago.me/read-manga/manipulate_my_heart/ (age gap, teacher-student relationship but both leads are 18+, bullying and harassment, kidnapping and confinement, homophobia, human experimentation)
https://www.mangago.me/read-manga/drown_in_the_angel_s_swamp/ (age gap, drugging and sexual assault [not between MC and FL], dub-con)
Ugh so real, I think I have some! I put them under "won't read" just bc of that lol. There's give love! And maybe bad thinking diary?
Why wont yuri/gl use seme uke terms omg its so hard to find black flag seme in yuri (i dont want mutual toxic, i want yaoi kind of toxic)