Looking for a beta for a short fic

[yuriookino.livejournal.com]

Hello people!
I've just recently joined the community and I would really like to contribute. I'm generally an artist, but I wrote a few fanfictions in the past, and now I've finally done something for the SPN fandom as well.
It's a short (<1500 words) fic I wrote with a theoretical season 10 finale in mind. Dean's POV, main focus on Sam and Dean (of course), the Mark and the Blade. There's a hint of demon!dean, featuring a bit of Castiel, and a lot of angst. Also major character death.
Not only this is my first SPN fic, but I'm also a non-native speaker. I would appreciate your feedback but also a bit of help with the grammar, if you can. The fic has already been posted somewhere, but I'd like to have it beta-ed and maybe to improve it with some advice, before I share it with the community.

Thank you very much to anyone who'll take their time to read this. Hope to hear back from you soon :)