A/N: So this is some random thingy I just put together. I actually intended this to be a very short thingy and it turned out to be a bit longer than I wanted. Oh well.

Also explaining the title: I know Cas has blue eyes. I mean green-eyed as in jealous. Do people say that? They do, right? Green-eyed monster?

Edit: Okay so because I feel like it I might just write another chapter though I wouldn't count on it. Because when I said it was first meant to be short and it turned out to be longer, I meant really short. As in ten lines or something. So yeah. Anyway, maybe just another chapter. Maybe.

WARNING: English is not my mother tongue and therefore this fic pretty much sucks. So I'm sorry for all the mistakes I'm sure you'll notice. My English isn't nearly as good as I want it to be, unfortunately.

A GREEN-EYED ANGEL

Castiel stood idly by while watching Dean hugging the redhead with a huge smile. "Good to see you, Charlie" he said, holding her at arm's length while studying her. "Good to see you too, Dean" she answered with a fond smile on her face. Completely ignoring the ex-angel who was standing awkwardly a few feet behind, Dean began filling Charlie in on the event that occurred a few nights before. The night the angels fell, to be more precisely. Cas preferred concentrating on something else while Dean explained all the falling stars, since that was sort of all his fault. Willing himself not to listen, he fixed his gaze on a little spider who was waiting for a buzzing bee to fly into her web . After a few minutes though, he realized the explanation couldn't last that long and with a frown he lifted his head in their direction and listened again to what they were saying. Sure enough, the subject of fallen angels completely forgotten, the two were laughing and saying something about Sam and a hobo (or was it Frodo? Did they know anybody called Frodo? ). Cas felt an uneasy knot in his stomach, something that had become familiar and yet he still couldn't quite identify. He only knew he had it when Dean was talking with or about girls. This time it was a little stronger though. Maybe it had something to do with the way the two of them seemed to be getting along so well. There seemed to be a certain ease between Dean and Charlie and for some reason that bothered Cas. He himself and Dean got along well but there would often be a tension between them that was hard to ignore. And with Charlie, Dean was all laughter and affection. Was Charlie maybe more than a friend to him? He felt another uncomfortable tug in his stomach. And suddenly he understood.

Oh.

So this was what jealousy felt like. But he didn't really have the right to be jealous, didn't he? It wasn't like Dean was his. He liked that thought, though. Dean being his. But that thought also seemed to encourage his jealousy. And it wasn't a pleasant sensation. In fact, he really didn't like it. What he liked even less was the fact that Dean was still ignoring him and hadn't even introduced him yet. He looked at Charlie with a scowl and maybe she felt his hostile stare because her head shot up and she noticed Cas for the first time. "Oh, and who- who's that?" She suddenly looked very nervous and maybe even a little bit afraid. Probably because of the anger that was written on Cas' face. He quickly straightened his face when Dean turned around, but he found himself actually enjoying the fact that he intimidated Charlie. Well. More like scared her. Dean seemed surprised to see Cas. He really hadn't seen him yet? "Jeez Cas, how long have you been standing there?" Apparently not. Cas stepped closer towards them and Dean turned back to Charlie. "Cas, this is Charlie. Charlie this is-" But Cas interrupted him, preferring to do the introduction himself.
"I'm Castiel. Angel of the Lord." And after a slight hesitation he added "I pulled Dean from hell." There. That would be enough to suggest the profound bond he and Dean had. But in contrast to the reaction he expected, she visibly seemed to relax. "Oh, I know you. I've read all about you! You're the helpful angel! Although according to what I've heard, you're not really an angel anymore, are you?" she chuckled. Cas didn't. And the smile on Charlie's face faltered. She turned to Dean. "So. I guess I'll go inside and take a look at what I can do for you guys, huh?"
"Sure. Sammy's inside too. I'll be there in a minute." Cas was pretty smug when it seemed Dean wanted a word with him alone and when he was sure Dean wasn't watching, he shot Charlie another glare just before she left. She walked away as fast as possible.

"What were you doing there creeping behind the bush, Cas? Why didn't you just come to us?"
"Oh. I thought you knew I was there", Cas answered honestly. "Also you seemed a little… busy."

"Well I'm sorry I didn't notice you there. Next time you just come, okay?" he clapped Cas on the shoulder, causing an involuntary shiver running down his spine.
"Okay, Dean." Then they were walking towards the bunker and fell silent. The silence reminded him of the how easy Dean and Charlie could make conversation and that annoying feeling came back. He couldn't help himself. He had to ask.

"So do you like Charlie?" he ventured, trying to sound casual.
"'course I like her. She's pretty damn awesome." Cas didn't like that answer, but he didn't think Dean understood what he meant, so he pushed it a little further.
"I mean do you want to be in a sexual relationship with her?" Dean looked baffled, and then burst out laughing. Cas didn't understand what was so funny.
"I don't think I'm her type." He chuckled eventually. Cas was even more puzzled than before.
"But… I thought you were everybody's type". This earned him another chuckle, and though he liked making him laugh, he was just speaking the truth. And even if he wasn't her type, Dean was pretty light-hearted about it. Knowing him, wouldn't he be kind of annoyed there was a pretty girl that just wasn't into him? Why did that fact seem to be so funny to him?
"She's into girls, Cas" Dean explained.

Oh

At first, Cas felt like the huge knot suddenly seemed to untie itself. After all, now he had no reason to be jealous anymore and he was having a nice conversation with Dean and he could even make him laugh (even though it wasn't intended). Then he felt a little guilty because he was so harsh to Charlie. He'd have to make amends when they were back.
And then it struck him. The idea that somebody who was into girls was attracted to a man, was absurd to Dean. He even burst out laughing at the idea. This made Cas sad. This made him very, very sad. They had almost reached the door when Cas stopped in his tracks, worry lining his eyes.

"But Dean- If a person who is usually attracted to women meets someone he really likes, but that person is a man. Do you- do you think that person can fall in love with that man?"
It was Dean's turn to look puzzled now. He frowned at Cas and shook his head.
"Do you want Charlie to like me in that way?"
"What? No, no. Of course not, Dean." But his answer came a bit too quickly and that was enough to make Dean suspicious.
But then he put on a knowing look. Cas panicked. Did he know what he meant? Dean was smirking. That was a good sign, wasn't it?
"Oh, I get it. You want to get in her pants, huh? Don't worry, it comes with being human. I'm afraid she won't give up the boobs, though. Can't really blame her." He padded Cas on the back and Cas tried very hard not to enjoy the touch too much. "Sorry, man." Dean said and he went inside, snickering a little.

Cas stayed behind and felt the hope he felt seconds before sink all the way down to hell. Dean read his meaning wrong again. He understood now. The way he wanted Dean to be his Dean. The jealousy. The disappointment. The tingle when Dean touched him. Those were romantic feelings. Maybe he should've known. He always liked staring at Dean. He was just such a fascinating human being.

But it didn't matter. Dean didn't think of him that way, that was clear now. The thought about Cas liking him didn't even occur to him.

Inside the bunker Dean tried to concentrate on what his brother was saying to him. Something about the fallen angels.

Angels.

He had no idea why but he couldn't untie the tight knot in his stomach that had started nagging at him from the moment he suspected Castiel's feelings for Charlie. Huh. He was probably just hungry.