Isekai where someone else knows that they isekai'd

"If you wrote me, then you can give me the throne!" Yoonsoo is the successful author of a popular fantasy series. Just as she's about to start work on a new series, Imperial Prince Einzen Kyte, the worst villain she created has kidnapped her into the world of her own story.
○

The daughter of the Daites Province's Duke, Milliana, had enjoyed her previous life in modern Japan. However despite her present status, she finds life in her present world very inconvenient. Especially the lack of BL. So she seeks to reform the province's culture to achieve a comfortable life and moe. Eventually, to marry into another family, the disinherited former crown prince Mathesa arrived.
○
○ : infidelity (not between MCs)
○ not actually shounen ai

Mary Albert remembers that this world was an otome game she played in her previous life, and she turns out to be a villain, harassing and interfering with the heroine, and ended up meeting destruction at the end; the so called ‘villainous girl’s downfall route’. The obvious reaction is to carefully avoids the destruction ending... or not.
○

Penelope Eckart reincarnated as the adopted daughter of Duke Eckart and the villainess of a reverse harem dating sim. The problem is, she entered the game at its hardest difficulty, and no matter what she does, death awaits her at every ending. Before the "real daughter" of Duke Eckart appears, she must choose one of the male leads and reach a happy ending in order to survive.
○
○ : I'll get to it but I think this one was fucked up iirc lol

When I opened my eyes I had become the duchess. But something isn’t right. I went as far as becoming a character but I’m just a duchess in name that gets mistreated by the maids and ignored by her husband. What a crappy life. I’ll just quietly enjoy my tea, was what I thought. Something’s gone wrong with my cold husband!
○
○ : emotional abuse

I have transported as Civilian 1 into the tragic novel I wrote with my friends for fun.
Since he is prepared to declare war in order to change his daughter’s unhappy future, if I leave it like this, then many lives are in danger. That’s how I started to live with the daughter of the stupid duke.
But the small female lead is a bit strange, for some reason.
○
○ : sexual assault (not by ML)

Crossing over into another world after a freak accident, high schooler Sabina is taken in by a duke of the Crentia Kingdom? only to soon be offered up to the ugly old emperor as a concubine. When the king is killed by a mysterious assassin, Sabina must face the poisonous circle of other candidates in a battle for the royal seat. Can she attract the loyalty and affection of the men and women she needs on her side to survive?
○
○ I gotta look a lot more into this

I was reincarnated as the heroine of a predictable third-rate harem novel. I decided to live as the heroine and enjoy my comfortable life with the hero, but what kind of romance story is this?
My soldier boyfriend was always flirting with other girls, and I got kidnapped dozens of times. So I broke up with my boyfriend, went on a blind date, married the blind date, and… what? He was the demon king?
○
○ : overall shady mf ML who lies a lot

“Since I know the original novel, if I just avoid falling in love at first sight with the male lead, I definitely won’t have a tragic ending!” Thinking this, Louise avoids the male lead.
But what’s this? Unlike the original novel, the male lead passionately confesses his love to Louise, and the heroine, who she believed to be kind, has it in for her.
○
○ : attempted rape (not by ML)

I became the secretary of a tyrant in place of my clumsy brother to survive.
But I have so much potential for it. I’m so darn good at my job. Because I served the tyrant so well, everyone must have a happy ending.
Well then, shall I quit being a secretary and live a leisurely life now?
“Do you want to die?”
○ ()()
○ : murder; drugging; attempted rape (not between main couple)