A/N: this is another Supernatural sister fic but instead of the sister being in the middle she's the younger half sister of the boys. I'm also going to change some dialogue here and there cuz we all know what happens and I don't wanna just vomit the series with a random character. Anyways I hope you enjoy the story, but side note this is Castiel/OC (but i do like Destiel just saying)

I don't own Supernatural or any of the characters or settings, i do however own Isabelle Rose Winchester.

Italics are thoughts

*Isabelle POV*

I sat in front of my laptop, trying to figure out what angel were capable of. In the end I didn't learn much. Sammy understood how I felt I'm sure he's felt the same a fair few times. I decided to lay on the couch and watch tv. I had the volume really low, and I just zoned out. Dean started moaning and groaning, (not the good kind) and then he started violently tossing and turning around. I rushed over to him and started trying to wake him up. "Dean it's ok, you're ok." I said frantically trying to wake him up. He bolted upright, and punched me, and I fell back. "Dean," I said standing up hands up in surrender. "Dean it's me. It's Bellsie your baby sister. Dean you're safe your not in hell."

He blinked a few times then I saw the recognition come over his eyes. "Bellesie?" he said confused.

"Yeah it's me," I replied smiling. Sam was just sitting up. I walked over to Dean and hugged him. "You okay big brother?" I asked.

"Yeah I'm good," he replied.

"Good cuz that fucking hurt!" I said grabbing my face.

"What hurt? Bellsie what did I do?" he asked concerned.

"Well you kind of punched me in the face," I replied.

Sam turned the light on and turned my face so he could look at it.

"Jeez Belle, that's gonna be a bruise, but thankfully your cheek doesn't look broken," Sam said.

I swatted his hand away. "Ok great now leave it alone." Dean looked horrified with himself. "Hey Dean you ok?" I asked tilting my head.

"Belle I hit you," he said.

"So? You hit Sam all the time."

"Belle, it's your, and now you're gonna have a bruise on your cheek," he said burying his face in his hands. I sat on the bed next to him and put my head on his shoulder, and he put his head on top of mine. "Do you forgive me Bellsie?" he asked.

"Of course I do," I replied, getting off the bed.

Sam came over and put an ice pack on my right cheek. "It's late, lets go back to sleep," he suggested. Dean and I nodded, and Sam turned the light off.

I waited for Dean to doze off before I moved back to the couch. I sat there with my knees pulled up to my chest and stare at the tv.

Dean comes over and sits next to me. "Wanna talk about it?" he asks.

"Nope do you?" I replied.

"Come on Bellsie what's bugging you?" he asked.

"Stuff Dean, by the way how was hell?" I hissed at him.

"Belle I told you I don't remember."

"Yes you do Dean, you punched me, you'd need to be pretty damn far gone to do that."

"I'm sorry," he said again.

"Dean I can understand you don't wanna talk about it, but I don't wanna talk about this either," I said.

He sighed. "Someday I'll talk Belle."

"Same here." We sat in silence for a while. "How's your cheek?" he asked. "It throbs, but it could be worse," I shrugged. He opened his mouth to apologize but I stopped him. "Don't apologize again Dean, it's alright," I said looking him dead in the eye.

"Ok Bellsie," he grumbled.

"Go back to bed Dean," I said.

"What about you?" he asked.

I shrugged. "I'll sleep in the Impala and drive the night shift." Dean nodded and headed back to bed. The boys woke up and we headed off I got in the back seat and passed out.

*Dean POV*

Within 10 minutes of leaving the motel, Bellsie was out cold in the backseat. "Sammy?" I said.

"What's up Dean?"

"Do you know what's been bothering Bellsie lately?"

"Ohhh I don't know Dean, maybe the apocalypse, angels, demons, take your pick," he replied.

"I'm being serious Sam."

"So am I Dean. She's worried about everything that's all I know," he finished. He's hiding something. I drive for most of the daylight hours. Sam takes over for a few. We stop for gas and Bellsie takes the night shift. Sam and I chill in the back seat and drift off.

*Isabelle POV*

I like driving, I find it oddly soothing. Unfortunately Dean never lets me drive, except for night shifts. My night vision is better and I don't drive that fast, plus I'm cute so cops let me go. It's also the only time I get to pick the music. I was incredibly thankful that Dean didn't remove the ipod jack. You can only find so many cassettes with more modern stuff. I flipped my ipod to my Josh Groban playlist. I drove and hummed along for a while until I saw someone in the passengers seat. I gasped, looked over and it was Castiel. "You know some kind of heads up would've been nice. How long have you been there?" I asked.

"My apologies it wasn't my intention to startle you. Also what happened to your cheek?" he asked. My right cheek had developed a lovely blue bruise.

"Dean punched me it was no biggie," I shrugged.

"If your brother struck you I believe it is a very biggie as you say."

"He didn't mean it, he was having a night terror and well I tried to wake his up and shit happens. He's apologized more times than needed I forgive him."

"Would you like me to fix it?" he asked. I nodded out of curiosity, he placed two fingers on my forehead, then the throbbing in my cheek was replaced by a warm comforting sensation.

"Thank you," I said.

"You're welcome," he replied.

*Castiel POV*

After healing Isabelle's unsightly bruise I sat quietly for a bit. She had soothing music playing and she was humming along. "I've never seen you so calm before," I said breaking the silence.

"Well driving is soothing to me, and I like this music," she replied.

"I see."

"Cas can I ask you something?"

"Yes."

"Do you know what I am?"

"I don't understand the question."

"Well I have my power and Sammy told me it doesn't come from demon blood, is that true?"

"Yes you have no demon blood like your brother."

"So that being the case where does my power come from?"

"Your grandmother."

"What?"

"I thought you knew, your grandmother was a witch, fairly powerful and she died years ago. Her daughter your mother begged her on her deathbed to giver her child an ability to protect itself. Your grandmother cast a spell which gave you your power."

"So I'm a witch?" she asked face falling.

"No, you're not a witch, just a very powerful psychic," I said reassuringly.

"Well I guess I can live with that. I'm not sure how wingus and dingus back there will react," she said gesturing to her brothers.

"Have you told them the strength?"

"I showed Sam, but Dean I'm too afraid to even talk about it. Wait them why did demons kill my mother?" she asked.

"Because they heard of the gift and they thought she was still heavy with you," I replied. Of course she would ask about the death of her mother, but unlike Dean she seemed to accept it better. "Do you miss her?" I asked.

"Miss who?" she replied confused.

"Your mother."

"Well I should but in truth you can't miss why you don't remember," she looked sad. "I don't even really know what she looked like other than the 2 pictures I've seen of her. She was pretty," she finished smiling sadly.

"I'm sorry for your loss."

"Thank you Cas. So how's it going?" Again with that question.

"It's not going as well as we'd hoped, but we are saving seals."

"Nice."

"And how are you doing Belle?"

"Not gonna lie, I've been better."

"What's troubling you?"

"My brothers constant bickering, them not being open with me, me being too afraid to be open with them," she sighed. "I feel like my family is falling apart," she finished sadly.

"I'm sorry Belle," I said putting my hand on her shoulder as she had done to me a week prior. I slight smile came across her face.

"Thanks Cas."

"You're very welcome." She leaned back slightly and rested her head against the hair bauble on the back of her head. "Wouldn't you be more comfortable if you weren't wearing that?" I asked.

"Wearing what?" she responded confused.

"That hair bauble."

She shrugged. "It's not so bad." I carefully reached over and removed the bauble, it looked like a small large toothed animal. Her hair spilled down her back and across my hand.

She giggled. "You really don't like my hair up do you?"

"I'm not against it, i just think it looks nicer like this," I replied.

She smiled. "You're kind of adorable." I tilted my head confused. "Just your lack of knowledge about human nature I find it endearing," she laughed. "Silly I know, but that's just how I am I find things cute fairly easy."

"I'm not sure how to respond to that."

"Umm take a compliment?" she suggested.

"Uhh thank you," I said unsure. I felt a pull and knew a battle was on. "I have to go," I said.

"Ok see ya," Belle said and I left for battle.

*Isabelle POV*

If I wasn't driving I would've face palmed. I called the angel cute. Fuck. Me. My god that was awkward, and stupid and good god I hate my life. Oh well I continue my silent drive, surprised Sam and Dean stayed asleep during my back and forth with Castiel.

A/N: What do you think of me now?! yup that's where Belle's power comes from, and a mild step in belle and cas' relationship. Also sorry but the punch was necessary. Please Review if you liked it. and any questions or concerns feel free to contact me. ^w^. (long chapter I know).