A/N: Fluff! Fluff! Fluff! FLUFF!
It was mid-winter and the Winchester's and Castiel were on a hunt.
Sam had gone off to interview a witness, whilst Dean and Cas were walking to the scene of crime.
Dean let Cas take the lead, and he fell back and bent down to gather some snow. He turned it into a snowball, then stood up and threw it at Cas. It hit him on the shoulder.
Castiel froze and turned around in confusion to see Dean with a playful smile on his face.
"Snowball fight!" Dean exclaimed happily. His smile fell when Castiel continued staring at him in confusion. "You know?" Dean said, "Make a ball out of snow and throw it at someone, then the person has to try and dodge..."
"I'm not familiar with the concept," Castiel said simply.
Dean sighed and said, "never mind, let's just go find some evidence."
He pushed past Cas in a huff. Cas could tell he wasn't happy and wondered what he had done wrong.
A couple of days later, they had solved the mystery and Dean and Cas were once outside again. They were just on a walk and had entered a park.
Cas fell slightly behind Dean as Dean was talking to him.
"And it was pretty awesome, don't you think, Cas?" Dean said, looking to the side where Cas had been standing earlier. He was no longer there. "Cas?" Dean repeated again, turning around but only to be hit by a snowball to the chest.
Dean looked down where the snowball had hit him in confusion, then looked up at Cas who had a playful smile on his face, similar to that of Dean's.
"Snowball fight?" Cas suggested sheepishly.
Dean grinned widely, gathering up some snow and saying, "You are so going to pay for that!"