Shaun came out of the shower in a white t-shirt and ripped jeans. He ran a hand through his auburn hair that was still damp. He looked around the room and something seemed way off. He couldn't put his finger on it though, suddenly he knew. "Where's Nikki?"

Dean and Sam looked up at him. "What?" They asked.

Shaun asked again. "Where's Nikki?"

Dean looked around. "I don't know she was here a minute ago."

Shaun's panic went straight to overdrive. "Shit!"

Sam stood up. "Shaun calm down. I'm sure she's okay."

Shaun went to his cell phone and dialed her number. He ended up getting her voicemail. "She's gone. What if she never comes back. I can't deal with that! If she gets hurt. No, no, no! I can't lose my sister no!" Shaun was in full on panic now. The only one who'd be able to calm him down was Nichole.

"Shaun relax she's not gone. She probably just went outside or something. She's not gone." Sam tried to explain.

Dean stood up next to Sam. "Shaun, Sam's right. Just calm down okay?"

Shaun nodded. "I'll try."

Suddenly Nichole came through the door. Everyone looked at her and Shaun practically jumped on her tackling her to the ground. "Shaun! Whoa man are you alright?"

He hugged her tightly. "Where the hell were you? You had me so worried!" He yelled.

Nichole looked at him weirdly. "Went for a walk. Gosh don't have a heart attack."

"Nichole why didn't you tell one of us you were going for a walk?" Dean asked her.

She shrugged. "Cause I wanted to be alone. You were all mad at me remember? Everyone hated me for trying not to get killed. Did you forget that or something?" She asked him.

"That doesn't mean you just leave the room without telling someone." Sam told her.

"Maybe I didn't care enough to tell you, alright? So back the fuck off." She replied.

"Nichole what the hell is wrong with you?" Shaun asked.

"What's wrong Shaun? You got a problem? Huh?" Nikki asked.

Shaun crossed his arms. "Yeah. Where'd this damn attitude come from?"

"Your mom." She replied smirking.

Dean and Sam's eyes widened when she said that. Shaun however balled his fists. "Nichole Elizabeth Amber Winchester. How could you say that?!" He yelled.

"Sorry Shaun Michael Winchester. I didn't know you thought you could control what I did or said. Anyway back to the subject of why I left like I did. I'm old enough to take care of myself. None of you are the boss of me." Nichole smirked.

Sam looked at her. "Nichole. What's wrong with you? I know your mad but-"

She cut him off. "What was your first clue Sammy?"

Shaun looked like he was going to kill her. "Nichole." He said sternly.

"What's wrong Shaun? You going to hit me or something?" Nichole asked.

Shaun walked over to the wall and punched it. Dean sighed. "Nichole why are you acting this way?"

Suddenly the demon in her wanted to stop being mean. "I'm sorry guys. I was just speaking my mind."

"That wasn't speaking your mind Nichole." Shaun told her. Still clearly mad.

Nichole looked down. "Your right. I'm really sorry guys. I didn't mean to be so nasty. I'm sorry."

Dean sighed. "Whatever. Can we just get back to what we were all doing please? Lets forget about that little outburst?" Dean asked.

Shaun, Nichole, and Sam all nodded. Shaun sat down and began sharpening knives. Sam went to his laptop and began doing research and Dean was reading some lore books. Nichole looked around confused and Shaun looked up at her. "What?"

"What am I supposed to do?" She asked.

Shaun raised his eyebrows. "Clean the guns."

"Oh right. I knew that." She sat down and began cleaning the guns.

Shaun watched as Nichole began to clean the guns. Something was really off about her and Shaun knew it. He knew everything about Nichole, she was his twin after all. He looked at the way she cleaned and it was different she wasn't cleaning the way she usually does. This wasn't his sister. He knew something was in her, something evil. He looked up and everyone was starring at him with confused looks. "What?" He asked.

Dean shook his head. "Nothing. Sam and I are going to get food."

"Try not to kill each other okay?" Sam asked.

Shaun gave them a fake smile. "You got it." Sam and Dean left the room and Shaun walked over to Nichole, towering over her, he asked. "So Nichole? What happened to you on that walk?"

Nichole looked up. "What do you mean?"

"You know what I mean." Shaun said.

"Shaun your scaring me. Nothing happened. I swear." Nichole told him.

He smirked. "Sorry Nichole, I know something happened. I'm not as stupid as you may think."

Nichole gave him scared eyes. "Shaun what are you talking about your really scaring me."

Shaun grabbed her arm pulling her up to a standing position. "Then show me. I'm just going to you know do a usual check, some holy water, a silver knife. Just the usual and if your right then there's nothing to worry about."

Nichole gulped. "Shaun no."

He got out his holy water and tossed some on her, nothing happened. He frowned. "Well lets see if you're a shape shifter." He grabbed her arm and pulled out his knife.

"That won't work on me pretty boy." Nichole spoke as her eyes turned yellow.

Shaun frowned and pushed her into the wall. "You son of a bitch! Let my sister go!" Shaun yelled.

It smirked. "Yeah right, I like your sister. She's a hell of a character…wouldn't you agree?" It smirked.

Shaun glared at her. " Let her go." He said sternly.

"Oh Shaun you have skill. Why waste here? You can be in the world with, you have power." She told him.

Shaun shook his head. "I'm going to kill you."

She smiled. "You don't have that kind of skill. You won't be able to save your sister."

"Want to bet?" Shaun asked pressing the knife against her neck.

"No, cause you kill me. You kill her." She replied.

Suddenly Dean and Sam walked in and Nichole's eyes turned back to green and she screamed. "Dean! Sam! Help! He's trying to kill me!"

"Shaun what the hell!" Dean said grabbing him.

Sam grabbed Nichole and held her. "Yeah Shaun what's the matter with you?"

Shaun spoke. "She's lying to you! She's a demon!"

Dean looked at Sam and Sam got out his holy water. He splashed some on her, nothing happened. "Shaun! What the hell are you losing it?!" Dean said holding him tighter.

"No…guys this isn't a normal demon. It has yellow eyes." Shaun explained.

Sam let Nichole go. He quickly made his way toward Dean and Shaun. "Sam? Dean? Why won't you believe me?" Nichole asked.

"I'm not lying." Shaun replied.

"I see. Everyone gangs up on me. No one believes me." She took a long pause. "That's your best move."

Shaun, Dean, and Sam were thrown into the walls and Shaun yelled. "Son of a bitch that hurt."

Nichole's eyes were yellow again. "All the Winchester boys. I'm honored. I after all killed your moms. Sad isn't it?" The demon asked.

Dean closed his eyes. "Shut the hell up!"

"Dean, Dean, Dean. So strong, so brave, so skilled. Too bad. I'm going to have to waist you all." It smirked.

Sam spoke. "No you won't. Let our sister go."

"Sammy, my child. Your going to lead my army. I know it." It walked up to him and smiled. "That's if I decide not to kill you."

Shaun yelled. "Nichole! Honey you can hear me, I know you can! You have to fight it! You have to, your strong enough! You can do it!"

Yellow eyes frowned. "You think she's strong enough? She's not, she's weak! She can't save you! Relax, I'll try to make your deaths quick."

"Nichole your not weak! You can do it Nikki, we have faith in you." Dean yelled.

"Come on Nikki, we know you can do it." Sam spoke softly.

"I'll tell you she puts up quite a fight. But it's not good enough." Yellow eyes sighed.

Shaun yelled. "You evil son of a bitch. My sister's stronger then you and you know it. Your just a twisted fagot who lives in hell."

Nichole smiled and waved her hand. "Let's see your head explode."

"Ahhh! Fuck!" Shaun screamed in pain.

"Nikki come on. Don't let it kill Shaun!" Sam yelled.

The demon screeched. Shaun, Sam, and Dean fell to the floor. Shaun's head stopped hurting. Nichole fell to the ground. Shaun quickly looked up. "Nichole!"

She looked at him, her green eyes starring back scared. He got up and grabbed her in a tight grasp so she couldn't move. "Ah, Shaun your hurting me."

"Sorry Nikki. It's for your own good. I'm not letting up. Guys devils trap now!" Shaun said.

Sam and Dean quickly started drawing it. "Shaun I can't hold him off any longer." Nichole whispered.

He gave her worried eyes. "Just a little longer Nikki. Don't let him take control. Your more powerful than him."

Dean and Sam worked faster finally getting it done. "Shaun tie her in the chair now!" Dean yelled.

Shaun took her to the trap and tied her down as she screamed in pain. The demon had taken over again. "Shaun I didn't know Nichole was so strong. I think I want her to stay with me."

"You can't have my sister. I won't let you." Shaun told him.

Sam started reading the exorcism. "Oops Shaun I don't think it's working." Nichole smirked.

Sam read faster and louder and the smirk fell from her face, the demon smoke started coming out slowly then it all flowed out and went down. Nichole's head dropped. "Nichole!" Sam, Dean, and Shaun yelled.

Nichole looked up slowly barely able to keep conciseness. Shaun ran over and began untying her. "Nikki? I got you. I got you." He finished untying her and she almost fell out of the chair.

Dean sighed. "She'll be okay Shaun."

Sam nodded. "Yeah. Dean lets give them some time alone."

They left and Shaun carried Nichole bridle style to the bed, she rested her head on his shoulder. He laid her down on the bed and put covers over her. He then laid next to her holding his head so he could see her. He ran his fingers through her long auburn hair, sighing he watched as she slept feeling some what guilty that he didn't protect her like he should have. He instead was mad at her. "I'm sorry." He whispered and kissed her head before wrapping her in his arms and falling asleep next to her.