[a/n]This just came into my head. Gabriella is my oc. She's an angel, too. Sam's girlfriend, Carrie, is my sister's oc. She's a shapeshifter. Leilah is also my sister's oc. She's part demon & part archangel.

Castiel looked over at the sleeping angel of battle, sleeping. Castiel couldn't understand why. Angels didn't need to sleep. He couldn't understand why she would want to. She had told him she had wanted to see what it was like. She was curious. She had always been curious about humans and their way of living. As he watched her there, he couldn't help but think. Even though she was in a vessel, which was not bad to look at, he knew this was still his mate inside. Spending time among humans, he noticed himself beginning to feel human emotion. He had always cared for her. They were chosen mates. But, he had spent so much time around humans, he noticed himself at times feeling as a human would. It confused him even more than he had always been. As he observed Sam and his girlfriend, he had always been confused, but recently was beginning to find himself curious. Though Sam's girlfriend, Carrie, was not exactly human, she and Sam were still mortal beings. Castiel walked across the room, over to Gabriella. Her eyes fluttered open as he watched her closely.

"Cas, what are you staring at?" she said, sitting up.

"...nothing, Gabriella." Castiel said, blushing a little, something he had never done. It was something he certainly wasn't used to. He turned away. Gabriella put her hand against his face and gently turned his face around so it was facing hers again. She put her lips to his, and kissed him. After a moment, he kissed her back. He really wasn't sure how, but he did want to. When they finally stopped, leaving Castiel still in shock, she smiled at him.

"I've been wanting to try that." she said. Cas still stared at her.

"I've seen many humans do it, and I wanted to try it with you. It's a way they show affection, if I remember correctly." she said. In spite of himself, he didn't want it to end. He looked at her, his blue eyes meeting her blue grey eyes. He leaned his face in, close to hers and put his lips to hers, kissing her. This took her by surprise. She had never known her mate to show any emotion, or any display of affection, and definitely not the one to incite such a display. But, she soon kissed back, this time they held the kiss longer than the first time. When they pulled away, they heard a voice from the doorway, a voice they recognized too well.

"Oh, well, will you look at my brother."

They looked to the doorway to see Gabriel, obviously the one who had opened his big mouth, as usual. Dean was next to him, wearing the biggest smirk on his face. Castiel sighed, knowing he would never hear the end of this. Next to Dean stood Sam along with his girlfriend, Carrie, and slightly behind gabriel was his girlfriend, Leilah. The rest of them, not so much, but Dean and Gabriel would never let this one go.

"Oh, Cas, Cas, Cas." Dean said, still wearing his trademark grin, "You little devil."
Cas began to blush again, turning his head in the opposite direction of Dean and Gabriel. He didn't want to give Dean any more reason to torment him. Gabriella narrowed her eyes at Dean and Gabriel who chuckled to themselves.

"Will you two grow up?" Carrie said, which then made Dean and Gabriel laugh even harder.

[a/n]I don't know where it came from. Like I said, it just popped into my head. I know it was short. I just wanted to write it. It's actually my first Supernatural fan fic ever. I'll get better the more of them I write. I hope.