Responses
It had a beautiful purplish cover too! Featuring one or both of the saints. I think i remember the black hair saint being the focal point in the cover?
I FUCKING FOUND IT WOOHOO BY LUCK
"An Unexpected Marriage Between a Pure-Breeding Lesbian and a Giant God Clan in an Unforgivable Error"
"Moloch no Toriko ~Junsui Baiyou Lesbian to Jain no Shinzoku Yoki senu Error de Masaka no Seikon~"
I will probably never find this Manga again because I read it in a private browser before accidentally closing it it has such specific traits and plot, its impossible to find.
So its historical fantasy, with straight smut plot. It had a very Sexy and busty artstlye similar to https://www.mangago.me/read-manga/otome_game_kuro_dora_kuroi_seijo_to_ashiki_ryuu_ni_isekai_tensei_shitakedo_murigeu_tsunda/ . It also had the same dark fantasy vibes as that Manga. Everyone was super hot.
So the plot starts off as two women who are sacrificial saints(?) for a kingdom. They grew up in a secluded temple alone and are quite naive of the outside world. One is blond and is the princess of the kingdom, the other is black haired and seems to have a similar background. They encounter 2 demon brothers who they were supposed to be the sacrifice for.
Straight to the smut part, these two women are quite unaware what sex is when doing it with these men. Its dub-con, but they still decide to do it for each other (motivation) as they are having sex with the men. Turns out that the two women love each other and begin kissing to comfort one another right in the middle of sex with the men. The men are dumbfounded and irritated by this.
Skip forward, the men separate them and made them their brides. The saint womens' body have gone through transformation, the blond saint is more beautiful and gentle. Whereas the black haired saint seems to have transformed into the essence of a powerful demon (?).
The plot twist was that the black-haired saint was a demon in her past life (I think she was the mother of the demon men in that life), so thats why she was more familiar to them. Another plot twist was that the kingdom purposefully chose her in this life knowing her past life as a demon queen, as well as the blond princess of the kingdom because a prophecy said to give them up as sacrifices. The king of the kingdom had seemed reluctant to give up his blond daughter back then.
So basically, I think it ended with the women tolerating the men while caring more about each other. Like the demon men were background noise.