Fanfic ideas (anime-wise)?

In Bloody Mary - people who feel responsible for the death of someone and kept it a secret are the targets and she causes their eyes to bleed. Now we know in Bloody Mary that Sam's eyes were bleeding because of his feelings of guilt over Jess's death. But in that episode Dean's eyes were bleeding as well.

Why? What death does Dean feel responsible for and will he tell Sam? Is Dean really responsible for their death?

Did he mistakenly kills someone or cause them to die?

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.