Why Does Everyone Treat Me Like a Teammate When I'm a Monster?

[No system, no clichés, numbered sequence, plot-driven, not an invincible leveling-up game, self-interest, monster perspective, yandere single female lead]

My name is Shen Shi, and I have a secret.

On the eve of the college entrance examination, I became an oddball in the eyes of my classmates, a fallen genius, a weirdo wearing a mask in the middle of summer.

It stinks! It stinks! It stinks! Everyone smells the same way!

My sister, whom I spend every day with, smells sweeter and sweeter.

I know my sister has awakened, and I also know that I have become a monster.

A monster unlike any other.

Until that day, when the transfer student and the school beauty found me, a third flavor entered my world.

Something's not right, she's fake.

I must keep this secret.

——

My name is Shen Congxing, and I have many secrets.

My brother is of royal blood, a top predator in the dark world, a monster with double pupils and a terrifying sense of smell.

It was pouring rain that night, and he took me home.

Every bit of his restraint, control, and desire towards me sent shivers down my spine.

Until a rising star joined the department.

Wait, bro? How did you sneak in here?!

I must keep this secret.

Of course, this isn't the only one.