The Villainess in a Sibling Romance

I've been dying to write this one, so please add it to your collection!

Meng Shuxue was made to kneel in the ancestral hall.

She dug up the immortal object hidden beneath it.

It was white, soft, and tender, like bean curd or pig brains. When she touched it, it felt very soft, wrapped in a layer of oily film. It was a little disgusting.

But she ate it.

She wanted immortal powers. She didn't want the Meng family to drive her out and marry her off far away, where she would die miserably on the road back.

After having a huge fight with her elder brother, Meng Shuxue had a dream.

In it, she was the villainess in a story about a brother and sister. She occupied the role of Meng Fuqing's younger sister and was doted on endlessly, becoming more and more spoiled and domineering. Only Meng Fuqing could keep her in check.

Later, it was discovered that she wasn't Meng Mother's biological daughter. When the real Miss Meng returned, she gradually took away the affection and attention that had once belonged to her.

Even Meng Fuqing stopped being as close to her as he had been, growing colder and colder.

Unable to bear it, she did something wrong and nearly killed the real daughter.

Meng Fuqing was furious and never saw her again. The Meng family hurriedly married her off far away.

She refused to leave and fled on the way to her wedding.

But she died on the road back to the Meng family, trying to find Meng Fuqing.

After waking, she found that what happened matched her dream.

Meng Shuxue remembered the immortal object from her dream, the one that would grant her powers if she ate it. She would eat it and gain immortal powers, then she could change everything.

So what if she wasn't born to the Meng family? All she wanted was her elder brother.

Meng Shuxue waited eagerly for the day, seven days later, when she would gain immortal powers.

But she discovered that her belly was gradually growing, as if she were pregnant.

Terrified, she hid in her bedroom, afraid to see anyone.

Until Meng Fuqing came home.

She lifted the covers, afraid to touch her belly, and asked him in terror, "Elder Brother, what do we do?"

Meng Fuqing stared at her swollen belly and suddenly smiled.

What do they do?

Why, of course...

Make it disappear.

How could his younger sister have another man's child in her belly?

[She's not really pregnant]

[Dark and twisted, very dark, extremely melodramatic]

[The leads already know from the beginning that they aren't related by blood]

[The heroine is spoiled, can't stand hardship, throws tantrums, and isn't very bright. If you don't like this kind of character, run!]

[The hero supports the heroine unconditionally. Whatever his younger sister does is right]

[The hero is restrained at first, then becomes dark and twisted, gradually getting more warped. No matter how twisted he becomes, his younger sister comes first]

[Low-magic world with a mix of demons, monsters, ghosts, and spirits]

Theme: Charge ahead bravely.