This is an idea I came up with a girl (or a boy idk) on an rp. It sounded fun so I'd like to give it a try. Also, my other story, "Even an angel can bleed" will end soon. Thanks for reading, review pls!

Dean knew that something was up the moment he began puking his guts out every morning and seemed to be putting on weight, rather than loosing it, his jeans didn't fit, his shirts were tight, and it was rather annoying. Dean sighed as he zipped up the zipper on his hoodie, one of the baggiest articles of clothing he had, it concealed the bump- for the most part, and was comfortable, plus it came down to his upper thigh so it hid the top of his jeans- which he could no longer zip or button up, thanks to the odd weight he gained. It was weird, he looked like he was forming a beer belly more so than anything else... And he was at a loss, because what he thinks it might be? Was impossible.
Dean huffed out a breath and shook his head, adjusting his hoodie and trudged down to the kitchen, going to the coffee maker and began to brew a pot as Castiel stepped into the room, "Want any coffee?" Cas nodded and sat on a chair, sighing. The past month the angel wasn't feeling well. He felt strange, like someone – or something –had intruded into their lives. He looked at Dean as he walked over the table and left the cup in front of him. After their last hunt with the witch, he had noticed Dean was gaining pounds and that was weird, Dean Winchester could never get pounds. He was always so…elegant and…fit and..beautiful. Yes, the angel thought Dean as beautiful…

"Cas, what's wrong?" Cas snapped looking at Dean. He realized the hunter had asked him a thing and he hadn't answered. He breathed heavily closing his eyes. "I just have this…bad feeling." Dean shrugged and turned around. Immediately, he felt a slight pain in his stomach and screamed terrified, almost falling on the floor. Cas stood up immediately, catching him. Their eyes connected, lips licked and Dean's breath hitched on his throat.

"Are you okay Dean?" Cas asked confused and concerned and terrified. Dean nodded and held on the angel's shoulders standing up. "I just felt…a kick, deep in my guts". Cas frowned as he made him sit on a chair and kneeled in front of him. He raised his hand, uncovering Dean's swollen belly and touched the bump on his best friend's stomach. He frowned as he felt a kick himself. One kick, two kicks… He concentrated more, closing his eyes. That was impossible…

"What is it?" Dean whispered, frowning too. "I'm gonna die again, am I not?" Cas looked up at him and stood up, the frown on his face going deeper if that was possible.

"That spell… The witch cursed you with.." he muttered. "You started to gain weight after our encounter with the witch?"
Dean nodded simply. "That's right. After a few days I couldn't put my ass into my clothes and I still don't know why. I don't even eat that much."

Cas nodded, blushing. "Did you maybe had… a..wet dream that night the witch cursed you?"

Dean froze, cheeks burning crimson. "Why are you—"

"Just answer the question, Dean"

Dean frowned, looking at him weirdly as Cas tilted his head, waiting.

"Okay um...- yeah..."

"What was about?" The angel asked urgently.

"You." Dean mumbled and frowned deeply, looking at Cas. "Why are you asking me those things?"

Cas sighed in desperation and walked nervously up and down in front of Dean. To be honest, looking at the angel and his nervous walk, made Dean nauseus. "It's an angelic spell for reproduction of angels. The witch must have been really ancient" Cas whispered. "This spell sends the object of your affection into your dreams and you have sexual intercourse with him or her. Then the angel -or a person- who saw the dream has a weird bump for months. The spell is completed when the couple has sex so.." Cas shrugged. "We should have sex or you'll have your children inside of you forever".

"Whoa, whoa, hold on a second, angel" Dean exclaimed, looking at his best friend. "I'm a man. I can't deliver. How the hell am I supposed to give birth to…my children?"

Cas shrugged. "I don't know how the spell works Dean. But you… I'm sure you don't want to have a pair of kids inside your body for the rest of your life."

"So I have to have sex with you to release the angelic siblings? Ain't there any option?"

Cas shook his head. "I'm afraid not. I'm sorry, Dean." Before Dean could answer a flutter of wings was heard and the angel was gone. Dean sighed and stood up, taking off his phone and calling someone. "Hey, Bobby it's me. I need your help.."

I know it's tiny but it's a starter! What do you think? Want me to continue?