Fallen angel brothers

One by one they're gone, Why are you doing this?

After Anna got her grace back, she mysteriously disappeared, not leaving the Winchesters a word even to Castiel. Now he had more other major problems to face, cases of angels dying had increased, and for Castiel it must be stopped, but why? he thought to himself, why is he savingthem when they won't even tell him  what or who he was. He snapped out as he felt a breeze and it was cold. It was a never good sign.

Car alarms blare. Several cars in various states of smashed to pieces are in the streets of the night. Castiel appears and silences the alarms. He walks through the wreckage to the body of a woman. He moves part of her clothing off her neck; she has been stabbed to death, apparently she wasn't just a woman, she was one of his sisters. 

"Goodbye sister".

Sam and Dean had just returned from Pamela's funerla and Castiel decided to talk to them about the angels but Uriel decide to come along as if Castiel needed babysitting. "Dean, we know this is difficult to understand, we have a problem, It's about-", Uril shut him up telling that seven angels have been murdered, all of them from the garrison. The last one was killed tonight. Believe me it was a problem, and nearly impossible because you can't kill angels that many even Dean and Sam wondered who would done it

"Demons? How they doing it?" Apparently even Uriel and Castiel don't know then Sam decided to step in the conversation. "I'm sorry, but what do you want us to do about it? I mean, a demon with the juice to ice angels has to be out of our league, right?"

Uriel gave a look to Castiel like he wanted to blame Castiel but he doesn't want to reveal anything yet. "We can handle the demons, thank you very much", Castiel felt something od with Uriel, was he hiding something? does every angel knew about Castiel? Who knows.... "Once we find whoever it is but we might need help on getting the information out from one. Alastair, I know you will deny my request but he is strong, so maybe Dean could make him talk"

Then, Uriel stepped foward, "That's why we've come to his student. You happen to be the most qualified interrogator we've got", Then Dean looked down. He never wanted to experience what he saw or heard during his time in hell, it was just too much for him even Castiel knew since he was the one who took him out of hell. "Dean, you are our best hope"

"Cas, please you can't ask me to do this", and again uriel smiled his way to Dean then they teleport to where Alastair was held captive and poor Sammy had to be left. "Dammit!". Then they reached to a warehouse where Dean get his revenger to Alastair, Uriel kept his laugh under control because he liked Dean's humour but Castiel couldn't understand, as usual, the Uriel told Dean that he liked Dean because he never gave up then vanishes. "You know, I'm starting to think junkless has a better sense of humor than you do"

Cas looked away and said that Uriel is the funniest angel in the garrison and he shrugged, Dean asked why then Castiel told him that he was never the social type, he rather be alone and checked his vessel's family, he felt that he rather be alone so others wouldn't have talked about his secret past. Dean looked down reminding himself then he snapped. "What's going on, Cas? Since when does Uriel put a leash on you? I mean you are alone now but you listening to his crap?"

Castiel looked at Dean as he understood but he knew that the reason he's doing was not his decision, he was just following his father's orders but he had doubts, so many doubts that he rather not be and angel, as he thougt of that, he realised, why is she feeling doubtful, thinking Angels were cvreate without emotions or human expressions..... "My superiors have begun to question my sympathies.I was getting too close to the humans in my charge. You. They feel I've begun to express emotions. The doorways to doubt. This can impair my judgment"

Dean was still in disagreement but he told his last words to Castiel before facing off with Alastair, "You ask me to open that door and walk through it, you will not like what walks back out", and again castiel understands even himself would do the same, "For what it's worth, I would give anything not to have you do this"