Check the red book

When you are close to the book, a chilling eldritch energy fills the room.
Suddenly, a dark spirit forms like a thick black smoke, and before you can react, it immobilizes you on the bed.

Its skin is wet, like dark oil, there are sharp fangs in its mouth, and you notice multiple eyes fixed on you. An impulsive fear takes control of your body, you start to scream.
You struggle against the black tendrils wrapping around your limbs, but it's in vain, you are helpless. More creatures spawn around you, with the same skin, and multiple eyes, they are delighted by your screams.

The dark creature forces you to open your legs, and removes your t-shirt, pants, and shoes... he starts to pull your panties, and you are terrified, thinking about the imminent rape.
A tendril pokes your asshole and you scream louder...

Delighted by your pain and fear, the creature rapes your ass without mercy, your screams echo in the room, they are fueled by your pain and fear, one by one, they use your holes until you can't scream anymore... no matter how hard they try, your holes are broken, beyond healing, but you lost your mind and you just drool, with your eyes empty.

They return to their eldritch dimension, leaving your broken body on the bed.

THE END
Fear and pain ending