https://www.mangago.me/read-manga/savior/
This one???
Not sure if one of these is the one you're looking for, but these are all GLs that feature a vampire character:
https://www.mangago.me/read-manga/kiss_me_in_the_dark_of_night/
https://www.mangago.me/read-manga/a_girl_who_longed_to_be_a_hero_aims_to_be_a_hero_even_if_she_falls_into_a_vampire/
https://www.mangago.me/read-manga/vampire_chan_junior_chan/
https://www.mangago.me/read-manga/blood_time/
https://www.mangago.me/read-manga/koroshi_korosare_sankaku_kankei_ni_watashi_ga_ima_kara_hairun_desu_ka/
https://www.mangago.me/read-manga/vampires_higashiyama_shou/
https://www.mangago.me/read-manga/my_food_seems_to_be_very_cute/
https://www.mangago.me/read-manga/savior/
https://www.mangago.me/read-manga/liberta/
https://www.mangago.me/read-manga/scarlet_yuino_chiri/
https://www.mangago.me/read-manga/gunbured_x_sisters/
https://www.mangago.me/read-manga/shoujo_tachi_no_kizuato_ni_kuchizuke_wo/
https://www.mangago.me/read-manga/killing_me_1/
https://www.mangago.me/read-manga/black_backed_albatross/
TYSMM ANYWAYS!!
I think it was on where the art was like in black and pink and one of the girls has a slight jirai kei/lolita style
I can’t remember the name but is the gl about the vampires on here yet??