Castiel and Dean ignored each other as agreed for three weeks. It probably would have gone on longer if Cas hadn't nearly gotten decapitated.
You see, Dean was doing target practice, throwing his knife at the study wall. And then Cas walked in, crossing the room just as Dean threw his knife and it flew about a millimetre in front of Cas' face.
"Sorry man," Dean apologized from the top of a small couch against the other wall. "Didn't see you there." Cas scowled and pulled the knife from the wall before throwing it straight back at Dean. So that was it.
The next time they spoke it was for slightly longer, and because of Dean's curiosity.
"Hey, Cas," Dean said, walking through the kitchen messing with his gun. "Why are here exactly?" Cas sighed.
"What happened to ignoring each other? And do you have to fiddle around with your weapons all of the time?" Dean shrugged and looked at Cas (who was sitting at the desk in the kitchen doing… well, nothing) expectantly. Cas opened his mouth and was about to say something when he noticed that he was shaking.
"N-nothing that you need to know, demon." Dean's gun twitched slightly. He turned around, facing away from Castiel.
"Do not call me that." He said, his voice low and dangerous.
Dean only found out why Cas was there one month later. Two full months of tense exchanges and one short fight were easily overcome with the great deal of respect Cas gave to Dean after he saved his life. A Demon had broken in to the house while Cas was alone; it nearly killed him.
Cas was sitting upstairs thinking as he generally spent his time doing nowadays. It wasn't like he had anything better to do anyway. Then he heard a huge crash, which – along with a sharp smell of sulphur - sent him sprinting down the stairs to see what in hell was going on. And there, at the base of the staircase, was a skinny man with blonde hair and black eyes holding a wickedly sharp knife that looked like it should be used for intricate torture and not being wielded against anyone in a fight. Cas went straight for his blade up his sleeve – but it wasn't there. He had left it upstairs. He stood there, frozen with fear until the Demon lunged at him, blade outstretched. Cas tried to duck and managed to knock the man over into the ground. Unfortunately he was at a loss for what to do next as the Demon would get up in just a few moments and he had no weapon or any way to incapacitate him as there was no way he was going to get close enough to smite him. Sure enough, his opponent was straight up and slicing at him once more. Cas managed to avoid most of the hits by diving to each side and underneath the knife, but he was soon taken down; pinned to the wall by the blade.
"Gonna fly away, Angel?" The Demon said tauntingly, pulling another, smaller, weapon from his pocket and advancing slowly towards Castiel. "No? Good. I'm going to gut you like a fish, Ang-" But he never got to finish his sentence. His face lit up with the pale ghost of a skull and he fell to the ground at Cas' feet, much to his surprise. The Demon was dead. Because there in the doorway was none other than Dean Winchester, looking more than a little confused.
"Cas? What the hell, dude?" Castiel swallowed and looked down at the corpse that had Dean's blade buried in the back of it.
"I have no idea." Cas replied, shaking his head. He pulled the knife attaching him to the wall away carefully.
"No, I mean seriously, what the hell? Why was there a Demon here? And why was he about to kill you?" Dean looked at him expectantly and incredulously.
"I do not know. The motives of Demons isn't exactly my strong point."
"Well I figured. But he was about to stab you and you were doing nothing about it. Explain that!"
"What do you mean?" Cas was confused. "What could I possibly have done?" Dean raised his eyebrows.
"You're an Angel. Fly away." Dean said, almost mimicking the other Demon. Cas started shaking and he realised he could hear his every heartbeat. He opened his mouth to speak but ten closed it again and swallowed hard. He took a deep breath.
"I can't." Cas whispered.
"What?" Dean frowned.
"I can't," Cas repeated, a little louder. "I can't fly away. I can't fly." Dean took a step back.
"Wait, what? How can you not fly?"
"I don't have. I don't. Wings. I don't have wings." Cas pressed his lips tightly together and looked down at the floor and straight up again, right at Dean. Dean was standing there with his head tilted slightly to the side, his mouth open a little and his eyebrows tightly knit.
"What do you mean, you don't have wings? Isn't that kind of what makes an Angel an Angel?" He enquired.
"Well, it depends on who you talk to in and out of Angel communities. I am an Angel in every other sense. I just don't have wings."
"Why?" Cas sighed. He had been asked that question by every single Angel he met (as wings are on a different plane of existence to the one Angels, Demons, and Humans reside in and only Angels, most Demons and some Humans can see them) and to that day he did not have an answer. In fact, he was beginning to think that he would never know at all.
"I don't know. My family and I have speculated, but no one has any idea why I am wingless."
"Right." Dean coughed and looked at the ceiling. "Sucks, doesn't it?" Cas blinked at Dean.
"What does?" He asked innocently.
"Being the freak. The abomination." Dean replied with a sneer. Cas winced slightly. He hated that word. "What?" Dean looked worried.
"My-my brothers. Raphael, Michael, Lucifer… they used to call me that. Abomination. Please don't say anything. I do not want to talk about it." Cas finished, seeing Dean's half-open mouth.
"Okay. Wait, you have three brothers?" Cas shook his head.
"Actually, I have four. And a sister, but she's only eight. Michael and Lucifer are twins, and then there's Raphael. They are the only ones who… well. And Gabriel, he is actually quite civil when he's not pranking you. And my sister is Anna." Dean laughed and Cas flipped his head up quickly, surprised.
"Wow. Big family, then."
"I'm sorry. I don't know why I'm telling you this." Cas said, embarrassed.
"No, no, no, man. It's cool. I've only got a brother." Dean sobered up a little. "I, uh, don't really know what's going on with him. I actually haven't seen him in years. And my dad ain't too great either. And my Mom is… I don't know. So, you know, we could start a club!" He flapped his hands around and laughed sarcastically.
"Yes, a club. For people with abhorrent families. How fun." Cas looked disdainful.
"Ab-what now? Nah; we should call it the 'Sucky Families Club'. Sounds less pretentious." Cas sighed and shook his head. Dean was getting annoying at this point.
"Anyway, Cas. See you around." Dean said with a smirk. He started to turn away, but Cas stopped him.
"We are staying in the same house, Dean. Of course you'll see me." Dean smirked, again. The Angel clenched his teeth, irritated.
"Precisely. Oh, and Cas?" He indicated to the body lying half-forgotten on the floor. "You get to clean up." Dean gave him a satisfied smile and teleported himself back to the kitchen, just for dramatic flair. Unfortunately this didn't work very well as he was slightly off with his teleporting and ended up knocking the table over. Which of course Cas heard. And laughed at. Douche, Dean thought to himself.
A.N: Update's a bit late, sorry.