Summary: AU. Castiel likes her. She sits next to him in class and they're very close friends. He wants to be with her, to protect her and to love her. He gets that chance, but their brothers' feuding puts their relationship at risk. PLEASE R&R!

Disclaimer: I don't own Supernatural or its characters. I only own my OC.

A/N: Okay, an AU sister!fic here where Dean, Sam, Lucifer and Michael are bastards, Adam and Gabriel are the good guys and Cas is with one of my OCs. ENJOY!

Barriers

-One-

Her shoulder-length, straight, blood-red hair shone in the dim light of Castiel's room, beautiful green eyes meeting his own as they waited for their opponent to make their next move. Castiel slapped her hand and it hurt his own hand, but she just raised her eyebrows, damn near perfect nostrils (if that was possible) flaring slightly as a sigh escaped her stunningly shaped lips.

"Well, well, Cas…" She chuckled, "Getting weak are we?"

She slapped his hand and Castiel bit his lip as the stinging ran up his arm.

"Okay! Fine, Libby! You win!" He breathed, staring at his throbbing hand.

Libby flicked on the lights and saw the redness on Castiel's hand and she gasped, taking it gently in her own hands, rubbing it soothingly.

"God, Cas…why didn't you give up earlier?" She asked, "Look at this!"

"I…I was okay, I could hold on." Castiel replied, not expecting Libby to lean across and kiss his cheek.

The girl was so sweet and loving, a mere two months younger than Castiel. She'd always looked out for him, protected him, cared for him, and she was so gentle, but she had this tendency to self-harm, but not to a serious extent. Castiel feared that it was to do with her older brothers fighting with his older brothers, like they always had done. She hated to see them all fighting, it was just so wrong.

Libby rubbed his hand gently and kissed it, grabbing her jar of Vaseline and massaging a little into his hand.

"All better?" She asked, Castiel nodding.

"Thanks."

Then came the shouting that Libby really didn't want to hear.

"Lib! Time's up."

"Okay, Dean!" Libby snapped, looking at Castiel with sad eyes, "I'm sorry…"

"No, it's okay…" Castiel replied, hugging Libby close and gathering his homework together, "Thanks for the game of 'Slaps' by the way."

Libby smiled and walked Castiel to the door, watching as he crossed the road before closing the door and glaring at Dean.

"You cut out twenty minutes." She said, "That's unfair."

"No, what's unfair is the fact that the Novaks think that they can just look at us like we're stuff they walked in!" Dean snapped, Libby wanting to just punch her brother so hard.

"NO! Both sides punish Castiel and I, when we do nothing wrong!" Libby yelled, "What's unfair, is the fact that Castiel and I are so close, yet we're being torn apart by you! YOU'RE JUST LIKE DAD!"

With that, Libby stormed out of the room, Dean and Sam both looking really shocked at her outburst. She headed upstairs, passing her older brother, Adam. He saw tears in her eyes and he stopped her.

"What's up, Lib?"

"I lost twenty minutes with Cas today…and Dean didn't say why." She breathed, "He just came came out with what's fair and what isn't. Not why we lost twenty minutes of our time. It's so unfair! It's not like Cas and I have done anything wrong, so why should we be punished?"

Adam sighed and hugged the seventeen year old, not liking the way she was so upset about this.

He couldn't believe how selfish his brothers and how selfish Castiel's brothers were to curfew the time Libby and Castiel had together, when everyone could see how much they liked each other and that they wanted each other. Everyone could see that they maybe even loved each other, and to keep them apart like that was just cruel. All of it was too cruel.

-TBC-