"Ok," Dean rubbed his hands together lightly, leaning against the Impala. "Let's start with something simple. Anger." Castiel seemed cautious, but nodded.

"Alright, I'm gonna try and make you angry, ok? Don't hold anything back, just feel whatever it is that comes."

"Ok," Castiel mumbled.

"You're a dick."

"You've told me this before."

"Alright, so personal attacks not gonna work," Dean thought for a second. "God's a dick."

"I don't think you…"

"Assuming he exists. I mean, only four angels have ever seen him. For all you know, there is no father behind that emerald curtain; just another angel, pulling your strings."

"Dean…" Castiel's jaw was clenched; his hands balling into fists at his sides.

"Wow that would suck. All your life's work gone to waste. Although, even if God is a real guy, he's seriously been slacking lately. The guy's practically incompetent. Can't even keep one planet of morons in check; how he expects to save us all is beyond me. I bet-" Dean's little rant was cut short by Castiel's fist connecting with his jaw. Dean looked up to see Castiel; breathing erratic and muscles tense. The angel was staring at Dean, who smiled despite the taste of blood in his mouth.

"Feels good, doesn't it?" Castiel closed his eyes and took a deep breath – trying to calm down. Slowly, he opened his eyes and looked back at Dean.

"You good?" Castiel nodded; not quite trusting his voice yet.

"Alright, let's move on." Dean circled Castiel slowly, trying to think of something else. "How about something that tends to lead to anger," Dean suggested eventually. "Jealousy."

"I have nothing to feel jealous about," Castiel rationalised. Dean seemed to consider this for a second, still circling the angel. After a moment he stopped behind Castiel; leaning in close to his ear.

"I fucked Anna," He almost whispered. "I saw the way you looked at us when she kissed me in the barn. You wanted to rip my head off. I'm guessing you wanted her, but she was your boss, right? Can't hit on the boss. But then she became human. You saw everything she was. The women she became; the woman you wanted. But you still couldn't have her. I did." Castiel turned to look at Dean; fire burning in his eyes. It was enough to make Dean want to shrink away, but he stopped himself. Covering up with a self-assured smile, he continued.

"We did it in the back of the Impala; a little cliché I know, but it was worth it. She slid her hand right over this mark you gave me; fit like a glove." The beginning of Dean's next sentence was cut off by Castiel's hand around his throat. Dean was backed into the nearest wall.

"You should never have done that," Castiel almost growled. Dean tried to smile.

"You feel that?" He choked out. "Irrational. Emotional. You want to kill me right now, even though you know it wouldn't do any good." Castiel let go of Dean slowly and backed away. Dean rubbed his throat lightly.

"Wow. I never realised you wanted her that much." Castiel shook his head ruefully.

"She's not the one I want." Dean heard the whispered confession on the air as Castiel disappeared.

~*~*~*~

Dean paced nervously in the motel room. He wasn't sure if he'd heard Castiel right. Could the angel really have meant what Dean thought he did? Closing his eyes, Dean stopped moving. He didn't need to think about this anymore. Even if Castiel was feeling something for him, he wasn't allowed to act on it. Dean shook his head when he realised how disappointed he felt by this.

Sitting on his bed, Dean pulled his t-shirt off and threw it to the floor. Looking to his arm, Dean raised his hand to trace over the brand Castiel left when he pulled the hunter from hell. The older Winchester looked up when he heard the door open. Sam walked in and looked at Dean worriedly.

"Where did you go this morning?"

"I went out for breakfast, and then I had a little sparring session with Cass."

"You fought with an angel?"

"Well, no," Dean explained. "I just pissed him off until he hit me."

"Why?"

"Apparently he's starting to feel emotions. I was giving him a test drive." Sam shook his head, handing one of the two coffee cups in his hands to Dean.

"That sounded so wrong." Dean huffed out a laugh and took a swig from the cup.

"He said something weird to me," Dean mumbled. Sam looked over to him. "He was jealous when he saw me and Anna together, but he says he doesn't want her." Sam looked at his coffee cup; a thoughtful look Dean was used to seeing on his brother's face. Eventually, he looked back up.

"Maybe he meant he wants what you had with her, but not with her. Maybe he just wants to find love for himself." Dean nodded.

"Yeah, that must be it."

~*~*~*~

Dean leaned back into the pillows on his bed and closed his eyes. He was tired; three days straight without time to rest was taking its toll on the eldest of the Winchester brothers. His hope of being left to sleep for the next day or so was dashed when he felt the familiar rush of air that meant an angel was now in the room. Cracking an eye open, Dean sighed at the sight of Castiel standing at the doorway, waiting patiently for Dean to get up.

"Another social call?" Dean asked hopefully, pushing himself up on his arms.

"I'm afraid not," Castiel answered in his usual tone. "We have work for you." Dean groaned in complaint and sat up.

"Alright, what's wrong?" Castiel took a few steps into the room.

"We believe another seal is about to be broken; not too far from here." Dean looked over to the other bed in the room to see Sam sleeping as soundly as he wished he could. Sighing heavily, he stood up and nudged his brother.

"Sammy, wake up. C'mon." Sam opened his eyes slowly, protesting at the light.

"What's wrong?"

"We gotta go to work."

"But we just got back." Dean couldn't help but smile at the pouty look on Sam's face.

"I know, but our landline to the heavens over here," Dean indicated to Castiel and Sam sat up to look at him for the first time. "Says another seal is about to be broken." Sam nodded, somewhat erratically, and swung his legs out of bed.

"Ok, let's go."

~*~*~*~

Dean slammed the door open and walked into the motel; Sam and Castiel following close behind.

"Do we rock or what?" Dean beamed, sitting on his bed. Sam sat on his own bed and looked at his brother, a similar smile on his face.

"I have to say, that one was pretty easy." Castiel stood in the corner of the room; looking at its two occupants.

"You should rest now," The angel almost smiled. "You've earned it."

"I totally agree," Dean was still smiling as he threw himself backwards onto the bed. "I think I could sleep for a week." Dean heard Sam yawn in the bed next to him before he felt Castiel disappear from the room.

"G'night," Sam mumbled across the now silent room.

"Night Sammy," Dean replied quietly; closing his eyes and drifting off.