Here are the ones I can think of atm (●'◡'●)ノ
https://www.mangago.me/read-manga/the_last_step_on_the_way/
https://www.mangago.me/read-manga/norainu_no_yoru/
https://www.mangago.me/read-manga/cold_blooded_beast/
https://www.mangago.me/read-manga/the_origin_of_spices/
https://www.mangago.me/read-manga/hwanghyeon_text/
-> this story has a dark theme as a whole but their relationship is not toxic
https://www.mangago.me/read-manga/geu_kkeute_issneun_geos/

Anyone know a BL with an obsessive and a bit deranged lover. Little to none toxicity in the relationship please and thank you (づ ̄ ³ ̄)づ