Cas X Reader-female

The shower

30 minutes later you get out of the shower but you forgot a towel and pants. You were dripping wet and opened the door of the restroom and saw that there wasn't a towel around
Y/N
"Fuck their isnt a towle in the room what the hell do i do"

After thinking about it for a while you yelled for dean
Y/N
"DEAN......DEAN....DEAN"

He walks into your room and sees you hiding behind the bathroom door and starts laughing

Y/N
"Stop laughing can you just get me a towel please im wet"

Dean
"Ok but you owe me for this"

He walks out. A few minutes pass and Cas walks in with a towel but confused because he doesn't see you.
Cas
"y/n.... Are you trying to scare me? Where-
You open the door a little bit
Y/N
"I'm in the bathroom. Can you hand me the towel"
Cas walks to the door and hands you the towel. A few minutes pass and you walk out with no pants. You weren't paying attention because you were drying your hair but Cas was still in the room and saw you in your underwear.
Cas
"Oh i'm ugg sorry"
He turns around fast. You laugh a little because he seems like a middle school boy seeing someone naked for the first time.
Y/N
"Cas it's fine you didn't know that i didn't have pants on"
Cas
"No no no i'm just going to go im sorry"

He walks out really fast covering his dick. Cas goes straight to Dean's room.
Cas
"Dean i need your help"
Dean
"So how did it do? Did you tell her yet? Are you guys dating?"
Cas
"No when I gave her the towel I decided to stay because I figured that I should do it in a private place but then she walked out without pants I turned around but i saw her behind and I got this *points to his boner*  I didn't know what to do so I ran. How did it get this? And how do I get rid of this?"
Dean starts to laughs
Cas
"Dean this isn't funny help me"
Dean
"dude you just got a boner it happens to everyone and to get rid of it think of y/n"

Cas starts to think about you and you can see that it is showing more and then you walk into dean's room and look at cas then look down and see his boner. He covers it with his hands

Y/N
"I knew it I was right"
Dean
"How much did you hear"
Y/N
"Just when you said to think about me and I wanted to see what his body would do"

Cas turned as red as a tomato even dean was surprised. He walked out of the room really fast. You didn't know if you should stop him or let him go but then it hit you that he was the only one that you felt safe around and next thing you know you were chasing him. You catch up to him and grab him by the arms.
Y/N
"Cas you don't have to be embarrassed about getting a boner girls also get something like that just a little different"
Cas
"Really what happened to you guys?"
Y/N
"Well we get wet"
Cas looks are you confused
Y/N
"Let me show you"
You grab his hand and put it down your pants. You look up at him biting your lip. Cas looks at you and is shocked. He uses what he  remembers what the pizza man did. He started to move his fingers on your clit. Your getting wetter and wetter but he diesnt understand why. He starters to go faster and you do a soft moan
Cas
"Do u want me to stop?"
Y/N
"No cas please dont I love this"
You can tell that cas doesn't understand why this feels so good so you put you hand in his pants and start playing with his shaft
Cas
"*does a soft moas* oh yes now I understand I don't want you to stop"
Sam was walking to his room and when he turned the hallway he saw both of you guys
Sam
"What the hell we have rooms where you guys can have sex"
Both of you guys take your hands out of each others pants really fast
Cas and Y/N
"Sorry"
You guys walk really fast to the library.
Dean
"So are you guys good now?"
Cas
"I think so"
Y/N
"I have to go
You walk out of the bunker. You don't know what you just did, what it means, or what to do. You called Jay