FL x demon lord

Although the title doesn't explain much, this story is about an MC reincarnated into a book world where she will become the saintess. She promptly dumps the boyfriend (a soldier bit also the male lead in a harem-style story) - and then unbeknownst to her ends up with the demon lord.

# Saintess x demon lord

FL gets reincarnated into a book as the unfortunate blood-related sister to one of the story's main characters. Her role is to have a miserable and short life and become a source of drive for the brother. But this FL doesn't want to die, so she sets about changing the fate of her character and in the process draws the attention of 3 hot guys.

# 3 potential love interests where one of them is the demon lord.

FL reincarnated as the saintess in an otome game, but somehow the story is all wrong and she keeps running into the demon lord (the villain in the game). Characters are funny and although plot is pretty straightforward it has more depth than first expected.
Definitely worth it for the art and smut alone. The demon lord is hoooot.

# Saintess x demon lord
# Full colour and beautiful art
# Smut but has a storyline

This is a oneshot smut manga with pretty good art. It's about a girl that gets reincarnated as a saintess and joins a hero-party, however her group don't appreciate her at all and basically rape her. The demon lord is the one that saves her and bring her to his castle to recover.

# Saintess x demon lord
# Smut

Human females are forced to travel to the demon world and become wives of demons as part of a peace treaty. Story centers around FL and her two friends as well as their partners. FL's partner is the demon lord.
Interesting story.

Technically the ML here is not the demon lord, but everyone else calls him so. FL gets married to him and together they play along with the demon lord rumors and use it to their advantage.

A woman wakes up in another body after having committed suicide. This body belongs to a witch who lives in the devil world. She has no memories of this new world or how anything works, but upon waking up she is promptly sent off to the palace to participate in the selection of the demon lord's partner, which is sort of like magic school.

This starts of pretty terrible, but it gets better along the way. The story is quite interesting if you're into magic, witches, demons and different realms