I have erased the Castiel story and re-published it with a few added bits.

"You are not coming with us!" Dean shouted at me for the last time.
"He's right," Sam sided with Dean. "You're young and you're female, the perfect prey for the Okami."
"What am I supposed to do all night?" I moaned.
"Read a book."
Dean threw a book at me and followed Sam out of the motel room, laughing.
I picked up the book when I was on my own to see what it was.
50 Shades of Grey.
"What a pervert," I muttered, rolling my eyes.
After ten minutes of silence, I turned the TV on and flicked through the channels but there was nothing on. "Boring. Crap. Seen it. Rubbish."
I stopped on one channel to see a cartoon angel with white wings, a halo and a harp.
Smiling, I remembered what that's what I also thought of angels as but I knew different now. Thinking of angels brought a certain one to my conscience.
I rested my head back on the sofa, picturing him. It'd been a few days since I'd seen him but his image was fresh in my mind.
Dark hair, the bluest eyes, stubble covering his chin. That long tan trenchcoat he always wore and the suit underneath. I wonder what was under the suit . . .
Castiel had always done something to me, always made me feel warm.
I reached down to scratch my thigh and stopped; it felt really good so I squeezed and then pushed my fingers across.
Taking a quick deep breath, my insides tensed. What was wrong with me? I never did this but the thought of Cas urged me on.
My fingers dug into the denim of my jeans and I sighed, heat running through my body and the friction was like little electric shocks.
I unbuttoned my trousers and moved my fingers to the edge of my pants. I was imagining they were Cas', warm and soft and my fingers worked into my underwear and rubbed circles into my clit. My thighs and inner walls tensed and tightened.
"Oh," I moaned and ran my free hand through my hair, then grabbed it. "Ohh. Shit."
I was hot and wet and picturing Cas was working wonders.
"What are you doing?"
I heard Cas' voice and jumped up, trying to button up my trousers before I turned round.
"I . . . nothing! I was doing nothing. I mean, I wasn't doing anything," I babbled.
"But your hand was-"
"Cas, shut up!" I shouted, embarrassed but thankful he wasn't aware what I was doing and who I was thinking of.
Cas looked down at the floor with his puppy eyes, thinking he'd done something wrong.
"Where is Dean and Sam?"
"They're hunting, on a hunt I mean, killing something," I sat back on the sofa with my back to him and chewing my thumbnail.
"If you were doing nothing then why are you embarrassed about it?" Cas asked, walking round to face me.
"Cas, can we please not talk about it? Look, just go."
He nodded, obeying and disappearing.
"Oh my god, oh my god, oh my god," I said into my hands when I was alone again.
I was never going to be able to let myself live this down.

The next morning, just after I had left the motel to get some food before we moved on, Cas dropped in.
"Hey Cas," Sam looked up.
"What's up?" Dean asked.
"Where is Sherrie? Is she here?" Cas looked around the motel.
"No, she's just left to get us some food. Why, what's wrong?" Dean raised an eyebrow.
"I need to talk to you without her being present," Cas answered.
"Okay, well she's not here so will you tell us what's going on?"
"I am confused and need you to explain something."
"Well, go ahead," Sam nodded.
"I came here last night but you were hunting and Sherrie was on her own."
"Sooo?" Dean shrugged.
"She was making these strange noises, I thought she might have been injured so I asked her what was wrong," Cas carried on explaining.
Dean and Sam looked at each other, both having an uneasy expression on their faces.
"What did she do, Cas?" Sam asked.
"She jumped up off the sofa and started shouting at me. I thought maybe I'd done something wrong," he answered, the same hurt look on his face.
"What do you care?" Dean inquired.
"I do not wish for her to be angry at me," Cas said and paced.
"Cas, is there anything else you're not telling us?" Sam watched Cas, sensing he was withholding something.
"Well, when she was making the . . .noises, she-her hand, it was down her-"
"Whoa, whoa, whoa, that's enough! Stop right there!" Dean stood up and started waving his hands around.
"Why? Does that mean she was doing something wrong?"
Sam was sat at the table, his hand over his face, trying to erase what Cas had just said from his memory.
"Okay. First thing's first. If you ever, ever see someone like that again, Cas, do not tell anyone, okay? I mean it. Keep it to yourself, even if you don't understand. Second, you really don't know what she was doing?" Dean asked.
"No, but if she wasn't in pain then why . . .I mean, it did sound like-"
"Yes, yes, I'm aware of how it might have sounded but just . . ." Dean interrupted and put his hand on Cas' shoulder. "What she was doing, she was doing it because . . .well, I mean she was . . .Sammy, care to help me out here?"
"Nope, you're doing just fine as you are," Sam replied, trying not to laugh.
"Sam!"
Sam sighed and stood up, joining Cas and his brother.
"She was . . .masturbating," he struggled to say without cringing.
"Rubbing one out, getting herself off," Dean added.
"So she was . . .pleasing herself, like men do when they watch porn? Then what were the noises? I am aware that men are nonvocal when they watch porn," Cas said.
"She was making . . .noises because . . .because it-it . . .felt, err . . ." Sam stumbled over his words.
"It felt good," Dean finished what his brother was trying to say. "And women tend to . . .make noises to . . .express it. They find it . . .*cough* hard to, err, keep the . . .noises in."
"If she was feeling good, then why did she shout at me?" Cas tilted his head in confusion.
"Because women, and men, only do it in private or with a partner, they don't really like to be caught. She was probably really embarrassed," Sam answered.
In the pause, Sam and Dean looked at each other and the situation caught up with them, making them break into uncontrollable laughing.
"I do not see what is funny if she feels humiliated," Cas said, slightly annoyed.
"Cas, I'm going to give you a few tips, tell you what to do," Dean said, controlling himself.
"Dean-" Sam tried to stop what his brother was about to tell Cas to do but Dean held up his hand to silence him.
"Next time she is alone, go and see her and tell her you knew what she was doing and why and that you've heard it feels better when someone else does it. Then, kiss her if you want, but put your hand where hers was."
Cas' face was flooded with nerves. "Dean, I can't-I'm not allowed-I mean that's-"
"You've watched porn so don't lie to me and tell me you ain't thought of the both of you in that position," Dean pointed at the angel.
Cas felt himself get hot and rubbed the back of his neck.
"Yeah, thought so. Good luck, Cas."

An hour later, Cas was back.
Walking to the fridge, I stopped and I scowled at him. "I thought I told you to go."
"I'm sorry you were embarrassed last night but I now know what you were doing. I know why."
"Cas, please can we drop this? I just want to forget it," I hid my face behind my hands.
He walked toward me so quietly I didn't realize, saying, "I have also learned that it is known to feel better when it is someone else's hand that is being used."
I jumped slightly at the closeness of his voice and watched Cas with wide eyes as he reached his hand toward me and pressed it against the front of my trousers.
"Cas-Cas, wait, what-what are you doing?"
"Does this feel pleasurable?" His fingers pushed between my legs.
Suddenly the room seemed to warm up very fast.
"Does this?" Cas moved his fingers back and forward against my jeans and I closed my eyes, biting my lip. When I opened them, Cas was looking at me with his head tilted to the side.
"Why are you doing this?" I asked.
"I don't know but your body wants it and I . . .I want to please you," Cas answered.
I couldn't believe what I was hearing and I didn't really care once Cas started moving his fingers again.
I closed my eyes again and kept them closed, even when I felt his breath on my lips.
"Kiss me, Cas," I mumbled and his inexperienced lips pressed themselves on mine.
Kissing him back, I wrapped his tie around my fist but Cas pulled his lips away and looked down at his hand, still buried between my thighs.
He pulled it out and fiddled with the button of my trousers and when it was open, he slid his hand into my underwear, moving it around, trying to learn what to do.
"Am I correct with the knowledge that it feels better against the skin?" Cas asked
His fingers brushed my clit and my first uncurled and grabbed his shirt. "Ohhh."
"You're wet. Is it because that feels good? It's why you make those noises, isn't it?" he asked and moved his fingers back again.
"Yes Cas, that feels good, that feels so good," I looked up into his blue eyes.
"There?" Cas asked and wiggled his fingers against my clit, making me cry out. "It does feel better if it is by anothers hand then."
"Cas . . .stop talking," I moaned and with my free hand, I grabbed the back of his neck and pulled his lips toward mine.
I could feel myself getting more and more wet and Cas started exploring, moving his fingers up and down until he found my entrance.
Pulling away from me again, he watched my face with curiosity when he pushed a finger inside me.
"Ah! Cas!"
"I'm sorry, did I hurt you?" Cas asked, worried.
"No, no. Do-do it again," I said and he did so, feeling happy with himself when I cried out again.
"Can I watch you?"
"What?" I asked, opening my eyes.
"Can I watch you do it like you did last night?" Cas asked and I bit my lip, unsure.
Cas carried on looking at me, innocently and I couldn't refuse him.
"I-uh . . .erm, okay."
I walked over to the bed and pulled down my trousers and pants before sitting on the bed; I shuffled back so I could lean back on an elbow and Cas moved to the end of the bed.
With my eyes closed to keep me from getting embarrassed, I took off where I stopped last night and rubbed my clit, every part of me below my waist tensing.
"Yeah, oh, oh yeah," I moaned.
I opened my eyes a little and saw Cas watching me with fascination, his trousers revealing his arousal and his trenchcoat and jacket now on a chair
"Cas," I paused what I was doing. "Come here."
"You want me to do it?"
"I want you to do it to yourself. Kneel on the bed."
When I noticed the nervous look on his face, I smiled reassuringly.
"Don't worry, I'll help you."
Cas put both knees on the bed and watched me unfasten his belt and open his trousers.
I pulled his trousers down and smiled at his hard cock in front of me and Cas looked down also, curious.
I took Cas' hand and wrapped it around himself, showing him what to do by moving it up and down.
When Cas got the idea, I went back to playing with myself while watching him, until I noticed him start to twitch in his fist; I got back onto my knees and whispered to him to take off his shirt.
I lied back on the bed and after the angel had removed his shirt and trousers from his legs, he knelt back on the bed and I signaled him forward with my finger.
All I got in return was a nervous look and some stuttering.
"I-what do I-?"
"Come here," I took his hand and pulled him down onto me.
Lying on top, he looked slightly scared but more aroused than anything and managed to work things out pretty quick.
"Yeah, yeah, right there, Cas, push, push."
Sliding into me, he felt bigger then he looked, my walls stretching and aching.
"It feels good," Cas moaned with his eyes closed. "You feel tight."
"I know," I gasped as he pulled out and jerked back in, hard. "Oh, Jesus."
I wrapped my legs around his thighs and joined him with each thrust.
"I like the noises you make."
His gravely voice sounded so good and I moaned again, louder, just for him.
I ran my hands through his hair and pulled his head to mine, kissing him deeply.
Kissing me back, his body seemed to overrule his mind because his thrusts were getting harder and faster and he was letting out the odd 'ohh.'
I'd never heard Cas make these sounds before and it was doing things to me that brought me closer to orgasm.
"Yes, Cas, yes," I groaned. "Oh, oh, yes. Ahh, ahh!"
"Sherrie, I feel-it feels-"
"Just go . . .with it . . ." I encourage him, adding extra power to the thrusts and cried out as I climaxed and felt Cas shudder on top of me.
"That was most enjoyable," he smiled down at me and I ran my thumb under his eyes.
They were so blue I felt lost looking at them.
"You were sooo good, Cas," I said and gave him a quick kiss.
"Did I please you? Did I give you pleasure?" Cas asked me.
I giggled. "Oh yes you did. It was amazing."
He smiled back at me and stood up, immediately re-clothed. "Then I have succeeded."
And just like that he was gone.
He might have just lost his virginity but he still had a long way to go before catching up with humanity