This is kind of embarrassing to admit, but my most powerful, recent fantasy is about as morbid as they come.
I can't stop wondering what it would feel like to be buried alive. The suffocating darkness all around me, closing in, feeling like I was going to die and knowing I could do nothing to stop it.
It seems to me the cruelest way possible to die, and I can't stop wondering what it would feel like. I know my Master has some plan to let me be buried alive and survive it somehow, but he won't tell me anything.
How fucked up is that, anyway?
A fascinating fantasy that I share as the man burying the girl, the only thing that I would add to enhance to your fear would be to make you dig your own grave.