Let me think.
It might be quick transmigration, though there'll probably be more ancient settings.
World 1: The wicked woman who marries the ugly younger brother in a farming story, then falls for his older brother
Her husband is rugged-looking, but his older brother is strikingly handsome. Xue Ying simply can't take it, so she secretly sets her sights on her brother-in-law.
She never expected...
To get caught.
Older brother x Xue Ying x fiancé
World 2: The younger sister in a story where the younger sibling takes her place as the bride
As the only girl in her family, Xue Ying is forced to marry a violent general after trouble befalls her family, while her twin brother gets to keep living as a spoiled young master. Thinking of the frightening rumors about her fiancé, Xue Ying grows increasingly resentful and decides to run away from the wedding!
Her brother is forced to dress as a woman and marry in her place. The original story was supposed to be about him and her fiancé falling in love after marriage, while she met with misfortune during her escape.
But now, Xue Ying has been caught and brought back.
World 3: The villainess in a mind-reading, doted-on-by-everyone story
This is a story about a beloved little child. The male lead can hear everyone's thoughts, and Xue Ying is the villainess, dark-hearted and always secretly plotting bad deeds, only to be outwitted by the male lead.
But now...
"Sister, is your husband as young and vigorous as me?"
World n: The village belle from a farming story x the transmigrated male gong x the male shou
World n+1: The brainless villainess with a System inventory in a famine story x the no-CP face-slapping male lead
World n+2: The wicked villainess who steals opportunities from the male and female leads and grows more beautiful as a result x the original male and female leads
World n+3: The extra childhood friend in a childhood-sweethearts story.
World n+4: The proper, etiquette-bound older sister in a brother-in-law romance.
(I might not write every story since I can't possibly finish them all. These are just ideas I've collected. I might not write them in order; it depends on what inspires me.)
Please save and follow. The ancient-setting section is a little quiet.
Theme: Everyone has their strengths.