"Dean, behind you!" Sam yelled for the third time and Dean shook his head, turning around and with a swift swing, decapitating the vampire about to grab him.

"What the hell was that?" His brother yelled, running up to him to be sure that he was okay, even though the vamp hadn't gotten a hand on him. "You almost got yourself killed. Where is your head? You've been like this a lot lately!"

Dean cocked an eyebrow, turning away from his brother to walk out of the abandoned warehouse. "Don't worry about it. I'm fine."

"Fine my ass!" Sam raced after him, grabbing his shoulder and turning him around, "You're not in this. You always seem to be thinking about something else when we're on a job. Hell, even when we're not on a job. You've been acting weird lately, Dean."

"No I haven't!" He rolled his eyes as if the thought were absurd.

"Yeah, actually. You have." Sam's brow furrowed in concern, "You haven't even been hitting on our waitresses or any females 've been sleeping weird. I know you haven't been listening when I've been talking."

Dean laughed, "I never listen to you, Sammy."

Now it was Sam's turn to roll his eyes, "Okay, fine. But explain the not hitting on anyone thing."

He frowned, shaking his head, "Maybe I just don't feel like it."

Now Sam was really worried, "You always feel like it. Doesn't matter how inappropriate the time is."

The older brother turned to walk away again.

"No, seriously, Dean. What's been on your mind?" Sam paused, cocking his head to the side, "Or who...?"

That stopped Dean cold in his tracks, and Sam knew he had hit the bullseye.

"Who are you thinking about, Dean? Is it Lisa?"

He turned around, looking at Sam. "No, that's done and over."

"Then who is it...?"

"Doesn't matter..." Dean mumbled, continuing toward the door.

"It sure as hell does. Come on, Dean! Tell me. This is important. You're life is at stake with this kind of thing!"

"Fine! It's Cas, okay? Cas!" He took in a deep breath, tears threatening to fall from his eyes, which pissed him off and he punched a pillar next to him. "It's Cas..."

"Oh..." Was all Sam could say. "So it's depression. Because you lost your closest friend. That makes sense."

"It's more than that, Sammy..." He was still facing him, but Sam could tell he was trying not to cry by the way his voice choked slightly.

"What do you mean...?" Sam asked carefully, stepping closer to his brother.

"I...I love...loved...him...Sam."

"Of course you did. Bobby and I did too."

Dean laughed sarcastically, "I don't think it was the same..."

"Because of your 'profound bond'?"

"Heh..Yeah, maybe."