Hey guys, thanks for the reviews on chapter one. Make sure you review this one too :D Much love. Mellie xxx

Castiel spent the afternoon laying on his bed, thoughts running through his head. Inappropriate thoughts about Dean. Inappropriate, only because they were illegal; well, where he came from. The thoughts he were having, if he'd been found out by a superior, could have him killed.

But Castiel was soon brought out of his thoughts as Sam made his way into the room and to his bed. He sat up and looked at his roommate, watching as Sam barely even sat down to take his shoes off, before digging through his draws.

"Got a date with Jess?"

"Yeah, and I have to go pick her up in 30 minutes." Sam exclaimed as he rummaged through his draw, tossing shirts on the bed.

Castiel gave a small laugh, "you get so nervous around her."

"Well, I'm hoping to make her my girlfriend tonight." Jess was a girl Sam had been dating for about a week. She was pretty, and made him happy; even though he was nervous around her a bit. They were the perfect couple. But Castiel wasn't so sure this was a good idea; she would only be getting hurt. Or if not hurt, killed.

"Oh? Are you sure? You don't think it's too soon-"

"What?" Sam asked, distracted by the comment.

"You've only known her a week, you're still always nervous around her. It just seems, too soon."

"It's not too soon." Sam exclaimed, leaving it there and walking into the bathroom to get changed. Castiel sighed. There's nothing I can do without telling him the truth, he thought, and I can't tell him the truth.

After pacing the room for an hour or so after Sam had left, Castiel called in for help from his first superior, Anna.

"What's the problem, Castiel?" She asked as she, uncomfortably, paced back and forth in the room.

"Sam."

"Well, I could of guessed that much. Explain."

"He's getting too close to someone. Yellow Eye's is going to go after her, and I can't stop him."

"Castiel. You can't stop the boy having a life. You just have to make she HE doesn't get hurt. We need him."

"I know, but that's some innocent girl who's going to get hurt."

"It's part of God's plan." And with that, she was gone. Castiel sighed and fell back on his bed, collapsing into the soft mattress. He looked to the doorway as the door closed. Dean.

"What are you?" Dean asked, prepared, as he looked at Castiel. "What was she?"

"Who? What are you talking about?" Castiel asked the hunter nervously, seeing a bottle of water in his hand.

"Don't act so bloody innocent." Dean scolded, walking over to him and putting his hands on either side of Castiel on his bed. "What are you?"

"I'm a human being." Castiel said with a gulp. Dean quickly opened the bottle and splashed water on Castiels face. Nothing.

"So you're not a demon. Was she?"

Castiel sighed. "No, she was an Angel, and so am I."

"Angel?" Dean said, thrown off guard slightly. "What do you mean?"

"I mean, we're Angels. God's army. Etc. Etc."

"Hold up. Angels? Seriously?" Dean wasn't so convinced, and Castiel knew that. He nodded, even though it wouldn't do much to help Dean believe. "Okay then. So if you're an Angel, what are you doing here, as a college student?"

"I don't think you want to know."

"It's not to.. uh, get with my brother, or anything is it?"

"What? No! Definitely not. I'm not interested in your brother that way." Castiel cleared up quickly – he may have been an Angel, but living with the human's so long, he'd clearly adapted to their behaviourisms.

"Then why are you here?"Dean pulled a chair from the table, so he could sit in front of Castiel as if to stop him from escaping, even though he knew if Castiel wanted to escape, he'd just have to vanish like his friend did.

"To guard Sam."

"So you're a Guardian Angel." Dean muttered through gritted teeth. He wasn't a religious man. Not even a bit. And the possibility of Angel's was bad enough for him, but Guardian Angels – now they were supposed to be completely made up.

"I suppose so." Castiel shrugged.

Dean realised what Castiel had said. "But why? Why does Sam need guarding?"

"Yellow-"

"Eyes. He's here?"

"Not yet."

"When?"

"We don't know. But he's coming."

"Okay. But, I still don't understand. Why is Sam important enough to you to need guarding?"

Before Castiel could say another word, Sam was walking through the door, a huge smile on his face. If only I could tell him that this is only going to get her killed, Castiel thought.

Sam was up for hours longer than Dean hoped, doing college work. He'd been hoping his brother would have an early night, so that he could finish his discussion with Castiel. But nope, the student had to keep working didn't he – on an assignment he'd only been given today, and didn't have to be in for a month. "It's better to get an early start." Sam said with a shrug when Dean enquired him about it, "not that you'd know. You flunked out of middle school."

"I did not flunk out!" Dean defended, although, both boys knew he did.

But finally Sam went to sleep, and Castiel – who was previously feigning sleep for Sam's sake – sat up and looked at Dean. "Go on then. Grill me, or whatever."

"Why is he important?"

Dean never managed to get it out of Castiel that night, why Sam was important to them, why he needed guarding.

He woke up the next morning, after Sam and Castiel had both gone to classes, to the sound of someone banging on the door. He got up and opened it, but no one was there.

"If there's a mother fucking ghost here, you better have a death wish!" He said, before realising the contradiction in the phrase. He shut the door behind and turned around, startled as he saw Castiel sat on the bed. "What the hell?" He groaned, rolling his eyes.

"I thought it'd be fun to scare you." Castiel grinned cheekily.

"I thought you took your powers seriously."

"No, I take my job seriously. There's a difference." Dean rolled his eyes, but really couldn't blame Castiel. He'd be the same and he knew it. "Besides, the only person who would of had the possibility to see was you." Castiel shrugged, getting up and grabbing himself a drink.

"Suppose." Dean chuckled, taking a seat on Castiel's bed by him. "Don't you have any more lessons?"

"No. I have a lecture later tonight, but I've got about 4 hours until that." Castiel smiled, sitting down beside him. "Why?"

"Just curious." Dean smiled. "What time's Sam getting back?"

"Not for a couple of hours yet."

"So, it's just the two of us for a few hours." Dean had a hidden smirk that it took Castiel a minute to notice.

"I suppose so." He shrugged as if it meant nothing to him. "But what's the worst that could happen, hey? We kill each other?"

Dean chuckled, although he didn't find the joke funny – he did, however, find Castiel's diversion and innocence cute-funny.

"Yeah, but what's the best we can do?"

"Huh?" Castiel asked, causing Dean to silently chuckle this time – silly angel, no one can feign innocence to me, Dean thought as he turned completely towards Castiel.

"You know very well what I mean." He lowered his voice as he spoke, smiling and leaning just that little bit closer to Castiel. As soon as he finished the last word, he kissed him.