Just a Story
When they got to the girl's house, Cas laid her down in her bed, sat down next to her and tried healing her. He noticed, however, that even before he had started, the gash on her arm was much more healed than it should have been. He healed her rather quickly, in a few fractions of a second as opposed to the few seconds that it normally took, and then sat there waiting for her to wake up. Castiel was confused because he felt a strange connection to her, but couldn't place it.
When the girl finally awoke, she awoke with a start, shouting and confused. Her shouting drew Sam and Dean upstairs and into her room before Cas even had the chance to calm her down. Sam opened the door and he and Dean slowly entered the room as the girl was calming down and regaining her senses. She was standing up next to the bed and Castiel had his hands gently on her shoulders.
"Are you alright now?" Cas asked. The girl nodded and Castiel let go of her shoulders and stepped back.
"So, we never got to know your name," Sam said quietly. "Would you mind telling us what it is?"
The girl jumped slightly at the sound of Sam's voice and turned to face him. "My name is Erela. What are your names?" The guys said their names in turn and she nodded after each one. "Thank you for saving me, but I really don't need your help anymore," she said.
"Wait. Excuse me? We save your ass from a demon without even knowing why you needed our help in the first place and you think that you can just tell us that you don't need our help anymore?! What if more demons come to get you? You can't fight at all. You'd be completely screwed! You'd be dead. Or sacrificed," Dean exclaimed angrily.
"Fine. Stay if you like. I don't care either way. Demons have been after me my whole life and I don't know why, so if you want to help me solve that or the reason why I can heal people and move shit with my mind and glow and kinda control the weather, then by all means, stay. Just don't eat all of my food!" Erela shouted as Dean stormed out. Cas noticed that she was glowing slightly and that some of her color had returned.
Dean got about halfway down the stairs before he fully processed what she had said. He ran back up the stairs and into the room. "Wait, what?" he asked.
"Yeah. Ditto," Sam said.
"Well, I think I might be able to answer both of those questions," Castiel said calmly. Erela whirled on him with hope in her blue-green eyes. "I just need to test one thing first," he continued, closing the small gap between them. Erela gasped and tried to back up, but Cas wrapped his arm around her waist. Sam looked from them to Dean, who almost looked jealous, and then back to them.
"Castiel, are you going to kiss me?" she asked incredulously. Cas merely nodded and pressed his lips to hers, pushing some of his grace into the kiss. Erela's body reacted instantly, pushing some of her glowing energy into the kiss as well. She wondered to herself in a fleeting thought how an angel, who she was pretty sure was a virgin, could kiss so well. As Cas tried to break the kiss to explain to Sam and Dean what was going on, Erela pushed her body against his and deepened the kiss. Reacting to her energy swirling within and around him, Castiel picked Erela up and she wrapped her legs around his waist and twirled her fingers around in his hair. Erela grabbed one of Cas' wings roughly and he grunted, surprised that she could see and feel them. To Sam and Dean, it just looked like she was grabbing at air. Cas walked over to the bed and they both fell into it, with Cas on top.
As that happened, Sam and Dean, who were still standing there watching and who had utterly confused expressions on their faces, felt the air pop in the room and the window flew open in a gust of wind. It felt like an explosion had gone off in the middle of a tornado and it was all the guys could do to stay on their feet. Simultaneously, the lights in the room started flickering and getting so bright that the brothers thought that they were going to burst. It took Dean yelling "What are you guys gonna do, have sex while we're watching?!" to get Cas and Erela to snap out of it and break the kiss. Cas rolled off of Erela and they were both panting heavily.
"What. The. Hell. Was. That?!" Sam asked.
"Well, I answered those questions," Castiel panted.
"Yeah, and?" Dean said.
"And Erela here is an angel," Cas explained, sitting up on the bed. "That was born into a human's body. She didn't fall because she still has her grace, as you guys just saw. But what I can't figure out is why she was born into a human's body. I heard rumors in Heaven of something like this happening to see if that could be the 'future of angels' or something like that, but…" he trailed off.
"But you thought it was just a story," Erela finished, sitting up.
"Exactly."