(S/N)=Son's Name (That is your/Cas son)
"Cas, you'll be fine." You reassured your boyfriend, "I'll be back as soon as this case if over with. Just take care of our little Angel."
He looked at you with a fearful expression, "(Y/N), you can't leave me. What if something goes wrong? What if he starts crying and I can't make his pain go away?"
"I believe that you'll be able to take care of him." You smiled, "He's just like you."
Cas sighed, "(Y/N), he is nothing like me. He wears a diaper and does not know how to speak or walk. We are two very different entities."
"Okay." You kissed his cheek and the top of your son's head.
Walking out of the house you went to the impala and joined your brothers. Driving off you grew nervous about how Cas would do taking care of your six month old son. He was an amazing father when you were around so you prayed that he'd be just as good on his own.
Castiel's POV
I held the small child in my arms and slowly bounced him as I've watched (Y/N) do a sufficient amount of times. With him being quiet I laid him down into his crib and walked out of the room, leaving the door open.
"Just a few hours." I reminded myself.
Walking to the couch I took a breath and sat down. Just as I was starting to relax a loud sound came from (S/N)'s room. Jumping up to my feet I ran down the hall. Reaching his room the door slammed in my face and would not open.
"(S/N), don't worry." I yelled, "I'm coming to save you."
I ran up against the door trying to break it down. Running out of options I used my Angel powers to burst the door completely away. Running inside something dark loomed over (S/N)'s body. Running to grab him I was thrown back against the wall.
"Don't touch him." A maleficent voice yelled at me.
Getting back up to my feet I attempted to vanish whatever loomed above my son. Looking at the small child his eyes glowed a bright blue. He faced the ceiling followed by a loud scream. Covering my eyes a bright light flashed. After a few seconds (S/N) began screaming from the top of his lungs.
"Don't worry, baby." I picked him up, "Everything is okay. I'm here, I'm here." I held him close to my chest.
He continued to cry as I bounced him as I quickly walked out of the room. Going to the living room I put him down into the playpen and dialed (Y/N)'s number.
"I'm not here right now, so leave a message." Her voicemail answered.
Muttering to myself I put my phone down and picked (S/N) back up. Keeping him close to me I was on guard all night for something that could come after him again. Part of me also worried about if he was going to have powers or if he'd end up being mortal.
~Few Hours Later~ (Y/N)'s POV
You walked into the house again and found Cas holding your child tightly to his chest. Cas was wide awake and holding out an Angel blade.
"Cas, what happened?" You questioned grabbing your son from him.
He shook his head, "He's alright. Something was above his crib, but we took care of it. We need to talk about the possibility of him being more than what we thought he'd be."
"What happened to my son?" You asked getting angry.
Cas stood up, "That isn't important. I think, I know, that (S/N) is powerful. He killed whatever was trying to come after him. He is able to protect himself from harm. (Y/N), our son is powerful. He is more powerful than we could ever imagine." He grabbed your shoulders.
Shaking your head you couldn't think about your son being powerful, "You make sure that nothing happens to him. He's going to grow up having powers, but won't use them whenever he wants. Promise me, Cas."
"I promise, (Y/N). Nothing is more important to me then you and (S/N)." Cas spoke kissing the top of your head.
A/N
Sorry this chapter sucks. I'm going to try and make this into a three part series.
