Work Text:
Cas was needed on a case and was acting grumpy the entire time. Sam had given Cas a wide berth, while Dean found himself gravitating closer. Now that they're alone in a motel room, Dean has to hide his smile. He isn't happy that something is upsetting Cas, but damn if he isn't cute and also the kind of scary that turns Dean on a little.
“Hey man, what's eating you?” Dean asks.
“There is nothing eating me, Dean. There are very few things that could eat a being such as myself, and they would certainly not be hidden!” Cas snaps.
“Woah, hey, let's take it down a notch, buddy. It's just a figure of speech. What's got you all -” Dean gestures to all of Cas with his hand.
Cas’ shoulders visibly sag.
“I am entering a particularly difficult time in my mating cycle; my energy and essence are… discombobulated. I should be in Heaven,” Cas explains.
“Oh. Uh. Sorry to keep you?” Dean's heart hurts. They only just recently started fucking, and now Cas is in a heavenly-being mating cycle? What does that mean? Is he going to have to bang it out with some other Angel? Wait…
“I thought Angels were made, not, uh, born?” Dean tries to ask delicately, but his voice is strangled so he misses by a mile.
“It's…” Cas huffs. “A new development. Possibly from the dwindling numbers.”
“Why are the numbers…”
“That's not important right now!” Cas shouts.
Dean is having trouble breathing. This is no longer the sexy kind of scary.
“I don't mean to keep you…” Dean squeaks out, “if you need to go…”
Cas is suddenly in Dean's space, cupping his face between both palms gently.
“I mean to keep you,” Cas says softer, but there's still an edge to his voice. He bends his head forward to rest against Dean's.
Dean relaxes by a tiny fraction.
“What do you need?” Dean whispers and brings his hands up to rest on Cas’ waist.
“You,” Cas growls.
Aaannnd they're back to the sexy kind of scary.
“I will need… time with you. More time than we have. Would you permit me to transport you somewhere more secluded? Where we will not be interrupted?” Cas asks, and Dean notices that he's started to shake a little.
“Yeah, lemme just…” Dean feels an uncomfortable pull in his belly button, and suddenly he's standing in a log cabin. “…text Sammy,” Dean finishes, awed.
Dean pulls away from Cas, who makes a pathetic noise. Dean looks around the comfortable rustic cabin and pulls out his phone to text Sam that he's on vacation.
The forest beyond the large window is beautiful and wild; Dean doesn't get to see a lot of scenery like this from the side of the road, it's usually a blur of trees or farm land between a sea of plain grass.
Cas moves over and plasters himself to Dean’s back and buries his face into Dean’s neck as he wraps his arms around Dean’s middle, tighter than necessary.
Dean remembers that he's here because Cas needs something.
“How can I help, Angel?” Dean asks quietly. He's pretty sure that he can't disturb the fox he sees outside, but he doesn't want to risk it.
“I need to simulate breeding.” Cas begins kissing and licking at Dean’s neck.
Dean lets out a choked out noise. Breeding. Why the FUCK did that word sound so… so… hot!? Dean has been a man with a dick and definitely no, uh, womb? his whole life, so he never gave much thought to that word. He rarely even considered the concept beyond wearing a condom, but having Cas say it like that…
“Gonna put a baby in me?” Dean sounds hysterical even to his own ears. He moves a hand over his stomach.
“No. I do not wish to change the makeup of your body. I only need to simulate breeding to appease my mating cycle.” Cas follows the shell of Dean’s ear with his tongue.
Dean shivers.
“Yeah, but, we could, uh pretend like it's gonna make a new Angel, and maybe it will help, ya know, trick your mating cycle more…” This all sounds very logical to Dean, and he mentally pats himself on the back.
Cas pulls his head away from Dean's.
“Do you like the idea of carrying my child?” Cas asks incredulously.
“No! That would… Pregnancy sounds like the worst! And there'd be a whole baby to take care of…”
“And a nephilim would be an abomination,” Cas explains.
“Uh, okay, I don't want that. But I like the idea?” Dean also likes the way Cas is humping his ass, but one thing at a time.
“You like the idea of carrying an abomin…”
“Stop calling it that!” Dean steps forward, away from Cas with difficulty, and turns around to look at him, “I like the idea of, shit man, I don't know, carrying around a piece of you?” Dean runs a hand through his hair.
“You like the idea of carrying around a piece of me inside of you which will not form into a child?” Cas tilts his head and studies Dean.
“Yeah! You got it.” Dean steps forward again and wraps his arms around Cas while placing his head on Cas’ shoulder.
“Wanna feel close to you,” Dean says so quietly, even Cas has to strain to hear.
In a blink, they are naked and Cas is pushing and pulling on him to get a good angle for a kiss that has Dean forgetting his own name.
“I will give you what you desire, Dean,” Cas’ voice sounds different, like there's a slight echo to it, as he manhandles Dean over and on to the large bed.
Dean feels like he won something with the way Cas is being extra imposing right now - he's more than happy to go where he's told and move how he's posed. He ends up with his face in the mattress and his ass in the air, with Cas standing behind him. Dean moans into the fluffy comforter when he feels Cas stretch and lube his hole with Grace. He always gets a little thrill out of having Cas do it that way; he loves Cas’ long dexterous fingers inside him, but he likes knowing that Cas doesn't want to, or in this case, maybe can't wait.
“Ready?” Cas asks as he notches the thick head of his cock at Dean's entrance.
“Put a baby in me, Angel,” Dean says, daringly; the words go straight to his dick.
Cas lets out a near-monstrous noise and slams his hips forward, bottoming out in one stabbing thrust. His hips slap against Dean’s ass so loud, it almost echoes in the room.
Dean shouts into the mattress, not out of pain, but from surprised lust. He plants his knees as Cas grabs his hips and starts fucking him fast and hard. It feels like he’s being fucked by a wild animal, and Dean couldn’t be happier.
“I'm going to enjoy watching you carry our child,” Cas pants.
Dean can't think about how fucked up Cas must feel to be panting, because he's busy going cross-eyed with pleasure at Cas’ words. This is so fucking crazy, he feels like he shouldn't like this, but the taboo only makes it hotter.
“Yeah, gonna make a good one for us,” Dean babbles, barely able to get his mouth away from the comforter to speak with the way Cas is drilling into him. The situation isn't made better with the way Cas reaches down to stroke his cock.
“I have no doubt.” Cas bends down to place his chest against Dean's back, and Dean whines when it changes the angle of Cas' cock.
Dean can feel the way Cas’ hips stutter, but he's not in much of a position to thrust back. Cas is fucking him rough and sloppy when he's usually so careful and methodical. The pace is rewarding and overwhelming in and of itself, but add in all the talk about carrying part of Cas inside, of growing something that would be half of each of them, and Dean feels transcendent.
“I'm going to put a baby in you,” Cas vows in Dean’s ear before he makes an incomprehensible noise, shoves his hips forward, and comes hot and wet inside his human.
Dean whines, almost dizzy with arousal; he doesn't even care that Cas has stopped stroking his cock, and that he hasn't come yet, because Cas’ words are still ringing in his ears. He swears he can feel Cas’ spend sloshing around inside of him as he breathes.
“Did it catch?” Cas asks and bites Dean’s earlobe before straightening up again.
Dean’s brain is scrambled, so it takes him a second to figure out what Cas means, and in the meantime, Cas pushes Dean around the bed. Dean ends up on his side, a pillow under his head, and Cas at his back. He moves a hand to his stomach.
“Yeah, it caught.” Dean nods and slides his hand down to his cock and hisses because he's so turned on, stroking himself almost hurts. He feels Cas lift his leg, but assumes that Cas is making room to fuck into him. Dean shivers when he feels cool slickness pool too far from his hole to be helpful.
“Wha…?” Dean asks, but his question gets answered when Cas pushes down on his leg, closing his thighs around Cas’ cock.
“Gonna fuck me like this?” Dean grunts as Cas gets a hand on his hip.
“Yes,” Cas sounds strangled as he begins to thrust into the slick, tight slide between Dean’s legs.
Dean has the ridiculous thought that he can't get double pregnant if Cas fucks his thighs. He must have said it out loud, because Cas answers.
“There will be plenty of opportunities for me to impregnate you during this mating phase,” Cas assures.
Dean comes so hard that his body tries to curl into itself as his cock shoots come across the comforter. Dean’s pretty sure his brain is going to melt out of his ears when Cas moves the hand down from his hip, to rest across his belly.
By the time Dean starts feeling like he's on planet Earth again, he feels Cas shuddering through a second orgasm; Dean doesn't ever remember him coming twice like this before.
Cas withdraws from Dean’s thighs, and Dean closes his eyes, spent and happy that he could help Cas in his time of need.
Then Cas guides his cock back to Dean’s well-used, fucked out hole and slides in again, gentler and slower this time.
Dean groans, a bit from overstimulation, but more from the way he can feel his cock incomprehensibly fattening up - it's been a long time since he was able to go another round this quickly.
“So, uh, how long is this mating phase going to last?”
“Three days.” Cas’ thrusts begin to speed up.
“Three days!?” Dean almost shouts. “If you're gonna need it constantly like this, I think my body might give out, even with using my thighs…”
“I will heal you,” Cas assures and makes another noise that sounds like growling, “And I will keep you aroused.”
Dean moans.
He's gonna get so pregnant.