Disclaimer: Sam, Dean, Cas and the world of Supernatural all belong to their God Eric Kripke. I own nothing! I'm also new at this, so please read and review:)

...

Chapter 1

They were at Bobby's when Sam had noticed an invitation lying in a pile of half-opened mail, strewn on one of those weather-beaten wooden tables where he liked to set up his laptop during their long research sessions. It was from a Dr. Visiyak, and it had simply read 'Christmas Party, my place. Bring the boys. X" Sam, sensing a golden opportunity to push his brother headfirst out of the closet where he had been tentatively peeking out of it, grabbed the letter and showed it to his brother.

"C'mon Dean, it'll be fun!"

Dean scoffed. "Yeah, right. I have to wear a stupid suit, and for what? I'm not killing anything. I'm not even after anything. It's pointless, the food is too small and I have to make small talk with assholes." Dean looked about six years old as he pouted to his brother, but Sam had known this resistance had been coming, and was prepared.

"It'll be nice to do something normal at Christmas for a change, Dean. Remember last time we had a Christmas? We staked a couple of pagan Gods with a Christmas tree, who, by the way, almost ate us."

"Yeah, but that was great, Sammy. I was in my element. Here, I'll feel like a fish out of water."

Then, there was a flutter of wings.

"Cas…?"

"I remember when you were a fish, Dean."

They both paused, mid-argument.

"Cas, what the hell are you talking about?"

Cas was looking somewhere over the horizon, but his thoughts were with the Winchesters.

"I remember when all people were just fish. My brother told me not to step on you, and I didn't."

"…"

"Did you get any of that, Sammy?"

"Nope."

"OK, then, moving on…"

They resumed their sibling squabble.

"Listen, Dean. We were invited. We're going. End of story. And Cas is coming too."

"…I'm sorry, Sam, where am I going?"

"To a Christmas party, Cas. You'll love it, don't worry. I'm putting you down as Dean's plus one, because they forgot to send you an invitation."

Sam looked proudly and mischievously from his big brother to his angel buddy. This was definitely going to work. Cas looked confused while Dean looked deeply uncomfortable.

"…Dean, I am your plus one. What's a plus one?"

Dean appeared to have something lodged in his throat, so Sam jumped in.

"It just means that you and Dean will go to the party together. Y'know, like partners!"

Cas smiled and looked towards Dean. This made sense.

"Dean, I am your partner!"

The thing in Dean's throat was making his face turn an interesting shade of red. He also seemed to have trouble catching his breath.

"Great!" Sam said. "Now everyone is happy, and Cas, just be at this address on Friday night. Oh and maybe lose the trench coat."

Dean and Cas turned to Sam like he had just said he wanted to put rims on the Impala and elope with Raphael.

"…Or keep it. It's…fine."

Great.