Dean presented as an omega when he was 16. He woke up with a fever in a puddle of his own slick and had to be taken to the hospital after his first heat lasted 7 days.
John, Sam, and especially Dean never thought he would present as an omega. John raised him and Sam to be strong, alpha hunters and while his father hadn’t been outright upset about it Dean knew the alpha was disappointed.
Dean has gotten a lot of shit throughout the years from hunters because of his presentation. There’s a lot of people who think omegas shouldn’t hunt or can’t do the job properly (are too weak, emotional, etc.).
Despite the fact that he’s an omega, Dean had always hooked up with anyone he wants. When he was in high school he was a fan of sharing heats with other male/female omegas, it took the edge off without being too intense.
He’s always been nervous about sleeping with alphas and usually tries to avoid it. They’re too rough (while he likes to be manhandled, the way most alphas throw him around makes him more anxious than turned on) and there’s always that off chance they’ll try to bite or mark him.
Dean definitely has a favorite dildo. It’s sparkly and green with a fake knot at the base that he uses during his heat. He hides it in this secret little pocket at the bottom of his duffel bag when he’s hopping from motel to motel with Sammy.
Sam is the only person who has ever seen Dean nest. He tends to do it about a week before his heat or after a particularly rough hunt.
Dean’s nested in the back of the Impala before. In fact, there’s a blanket under the seat just for that purpose. Sometimes they have to be in the car for days on end, and if it’s sometime before his heat or he’s just stressed Sam has had to force Dean to nest in the back seat and calm down when he gets too anxious or snippy.
Sam has given up on getting his clothing back from Dean when he nests. There’s no use, either the elder hunter will promise to give it back and then effectively “forgets” or he’ll just growl and tell Sam to suck it up.
Sometimes Dean will just go up and scent people. He doesn’t like to admit that it makes him feel better, but everyone (including Cas, Bobby, Charlie, and even Crowley) has caught him sniffing at them before.
Sam is used to it and even sometimes uses his commanding alpha voice to make Dean scent him when the omega’s stressed out or being a jackass.
Dean never scented or nested in front of his father, he was too embarrassed to give in to his omega instincts around John. Sam would follow him around talking about the health risks associated with ignoring his instincts but Dean never listened.
it literally cracks me up that every time there’s training or a contest or anything bakugou just absolutely loses his shit and screams at and declares war on todoroki (and deku of course) and todoroki is always just barely paying attention just like “look are you done because i’m kinda brooding in trauma over here”
Cas started to feel kind of funny about a week after his grace was taken away. Being a human threw him into an entirely different world, there were so many scents and instincts and his emotions were all over the place.
He went to the store to pick up some food one day with Dean and ended up having to be pried off of a short, blonde alpha that had hit on Dean. It wasn’t until the unfamiliar alpha’s hand was wrapping around Dean’s waist as the omega awkwardly tried to push him away that Cas had lost his cool.
Dean reprimanded him in the car on their way back to Sam, telling Cas he could take care of himself. Cas didn’t apologize, he was still seething.
He was already trying to get used to scenting people. Sam had been nice about Cas going up and sniffing at him, but Dean just pushed him away with a “down, boy” whenever he tried to stick his nose in the hunter’s neck.
Another thing he was trying to get used to was his newfound libido. He found himself jacking off frequently, often times thinking about the little intercourse he had witnessed in his life. After about a week he felt like the urge to climax was getting worse, he was horny all the time and usually couldn’t hide the arousal in his scent well.
When he asked Sam about it, starting the conversation with “Do you get intense sexual urges, Sam?”, the alpha had cringed and told him that that was a question for Dean.
When he asked Dean about it, the omega brushed it off and said something about it being normal, “You’re probably fine, you just didn’t get the usual twenty-some-odd years of jacking off to level things out. You just need some time to get used to it all.”
Sam yelled at his brother one day when Dean had refused to let Cas smell him for the thousandth time, “Dean, for Christ’s sake, just let him scent you! You’re the only omega he’s come across so far, he’s just curious!”
Dean bared his neck ONCE for Cas, and after that, the unpresented ex-angel was cuddling up to him every chance he could. At some point, Dean gave up and just let the man sit with him as he did his research.
Cas never ate as an angel and he found that food was just another thing he would have to get used to. Though he didn’t know human diets well, he felt like he was starting to eat more than normal as weeks passed.
He also felt like he was sleeping more than the average hunter. Sam and Dean could survive off a couple hours easy, but Cas could barely pull himself out of bed at ten in the morning. Dean gave him a lot of shit for it, but then Sam *politely* reminded him that Cas never needed to sleep before.
It was about three weeks after Cas had turned human that he suddenly got very angry. He was acting much different than his normal self, snapping at Sam and being too rough when Dean let him scent.
The morning after Dean had unhappily pushed Cas off of him for being too handsy, Cas woke up growling with a rock-hard erection. They were at a motel in North Dakota working on a werewolf case, Cas slept in one of the beds, Sam in the other, and Dean had muttered something about not being able to sleep and taking the couch.
He practically barked when the two Winchesters came over and started touching him. Their scents were stronger than they used to be, Dean’s was especially distracting.
They both backed off but informed him that he was in rut and that he had presented as an alpha.
He didn’t even think he was going to present, and if he did he would have expected to be a beta.
The Winchesters were quick to work, Sam went off and bought supplies while Dean bought Cas another room. They threw him into a one-person motel room with a king-sized bed, supplying him with some food, water, porn, and an alpha toy. Dean had even thrown in a couple of his own shirts, which had smelled like heaven at the time.
Sam gave Cas a thorough conversation on the basics of being an alpha, and an even deeper explanation on how to properly treat each dynamic, especially omegas: “You know how Dean gets nervous when alphas get close to him? Yeah, well most omegas are like that. You gotta be careful, don’t get in their space without asking. Don’t go up and scent them without asking. J-just, don’t do anything without asking, please. And don’t touch anyone who has a mate.”
Dean was a little bit weird about having another alpha constantly around him, but he didn’t mind it for the most part. He still let Cas scent him, and sometimes he even stole Cas’ clothes for his nests.
Cas got used to having ruts and the Winchesters trained him to restrain his alpha self if he smelled something/one good.
