That was cool and just what I needed!

Did you get the title from the song 'Just one Yesterday'?

cool story

I got one word for this: amazing!
But poor Cas. I would love to read more, please...? Maybe more about how they take care of Cas and/or how they get even with Zachariah.

Very interesting premise. Poor Cas. He can never catch a break.

OW!PAIN OW!PAIN OW!PAIN!

...Wow. You really went all out with the whump, huh? Not quite as bad as some things I've seen, but. Still. In or out of his universe, Cas just can't catch a break.
Though, it would have been more realistic if he actually did scream at some point. Torture isn't all about willpower. He only has so much pain tolerance, after all. (Pretty high canonically, I'd say, but not /quite/ as high as what you've got here...I don't think he can go through that and stay half as coherent in the end.)
It would be more gutwenching if you could expand a little on the thoughts and feelings side of things, aside from the dialogue and actions too.
It's been a good whump. Thank you for sharing this.

LOVED IT. and nice fall out boy reference...if it was one...clip their tiny wings...fall out boy...

This is great, well written and so in character. Poor Castiel, but I love the end.
Thanks for sharing. Take care.

Great story, are we to be expecting more?

Awesome just love whump Castiel and brotherly feels. Their friendship is awesome.

I loved this story so much! First it was all painful and terrible when Zach was torturing poor Cas, and then so awesome and fluffy at the end :) I really like how you write everyone, they were all very much in character and the part at the end where Dean insists on showing Cas Dr. Sexy is hilarious. And then Cas feeling like he's home? So many feels, thank you so much for sharing this :)

I really loved this. It's just like Cas to stay silent at all costs. Only question: Is Cas ever going to be able to hide his wings again? It seems like doing that would be insanely hard for him, like it was when they appeared.

Awesome one-shot! All of my favorite elements: Season 5, Cas whump, and brotherly feels. I also love how Cas was strong enough to resist Zach's attempts to get him to scream, and Dean on the phone telling him to hold on while he and Sam hurried to rescue him.

I just happened to be following you for other stories you write and then I saw a Supernatural, Cas Whump story in my email and I though I was dreaming.

This first chapter is amazing and so in character. I cannot wait to read more! Update soon and keep up the great work!