Two girls reincarnate together and have to navigate as a villainess and an evil lady
https://www.mangago.zone/read-manga/the_daughter_of_evil_and_miss_devil/
Girl who loves fantasy games reincarnates into a world with magic as a princess but doesn't have magic abilities so she decides to dedicate herself to researching and studying magic. one day she crash lands into her brothers party when her brother breaks off his engagement with his fiance our MC scoops up her brothers "villainess" fiancé onto her broomstick and convinces her into living with her and helping her with her magic research. This is great for our Villainess who thought her life was over as she was studying to be queen since she was a child and who knows maybe those queen lessons will come in handy one day with how our princess praises and flatters her so often.(it has a solid anime adaptation too it you wanna watch)
https://www.mangago.zone/read-manga/the_magical_revolution_of_the_reincarnated_princess_and_the_genius_young_lady/
So far I’ve only come across ‘I favour the villainess’ within reincarnation genre that’s a gl.