Ok, this is my second Durarara! Fanfiction, and also my second M-rated story, so two for two! I was going through the Shizaya archive and I couldn't find a single story about Alphas and Omegas. Then I started thinking and imagining, and my friend kept encouraging me and I came up with this storyline. Hope you like it, review please! P.S., I DON'T OWN DURARARA! And don't take anything in this story seriously; any "facts" are made up by me.

Every Alpha Needs An Omega

From ancient times up until now there is only three levels to society; Alpha, Beta and Omega. The Alphas are the head of this society; the high class you could say. The Betas are the middle class citizens, and the Omegas, the lowest class.

The Alphas' community was made up of only men, as there was no such thing as a female Alpha, and there still is no such thing. The Beta community is the mixed one, about half the population male and the other half female. As for the Omegas, they are all female, except for a few especially rare cases where you have a male Omega. These male Omegas are quite sought after by Beta males and Alphas as they produced the healthiest and strongest offspring.

Alphas are the ones with the jobs that required a lot of strength and/or intelligence. In the present they are the owners of chain stores, politicians, doctors, but they also do hard labour as most Betas and all Omegas are too weak to do it themselves. They make a lot of money in their jobs.

Betas are today's office workers, small store owners, and odd job performers, some being lucky enough to get a well-paid job, like a surgeon. They don't generally have the highest paying jobs, but normally they make more than the Omegas.

Omegas as a majority have the lowest paying, least taxing jobs. They work as childminders, teachers and sometimes chefs because there is little to no chance of them being hurt, and if they suddenly become pregnant, they can leave at the drop of a hat as there are many other Omegas to take their place until they return.

Omegas are generally seen as the dregs of society because of the way they were treated and thought of in the past: the producers of children. They are still respected, just not very much.

Most of the time you can tell which class someone belongs to by their attitude: If they are easy to anger and hard-headed, they're most likely to be an Alpha. If they are hard-working and mild-mannered, they are probably Betas. Then you get the timid and weak women who are almost always Omegas.

The prevalent problem with distinguishing a person's class is if they are an Alpha or Beta, or Beta or Omega. There is a saying that you can distinguish a person's class by a certain 'smell' that they have, so you just have to meet them once to know where they are in social status. This is a myth.

Omegas only produce pheromones or hormones during heat to excite a mate, not every day, so unless you ask or are their mate, you have to rely on deciphering their personality traits to find out their group. Betas do not produce pheromones or hormones at all, so they physically cannot produce a 'smell'.

Alphas can produce pheromones when they are with an Omega in heat, sometimes even if they feel threatened you can smell a faint whiff of territorial anger coming from them if you try a steal their mate or you try and start a fight with them, but never in day-to-day life.

Remember what I said about those rare, male Omegas? Well, a long time ago, they got sick of being seen as weak-minded 'baby-makers', which is fair enough, no-one would like to be thought of as 'breeding-machines', I'd imagine. Well, anyway, they went into hiding. Nowadays, the only way to know a male Omega personally is if they tell you what they are if you're a close friend, or you are their Alpha mate. Otherwise, you'll probably never know one.

With their personality though, they probably have to pass as Betas, because I doubt that they'd be able to pass as Alphas, and I'd also assume that they don't mate if this is the case as Omegas don't often chose a Beta partner and can't mate with other Omegas, male or female, it doesn't produce children and, as far as I'm aware, they wouldn't be attracted to someone just like them.

And what about me, you ask? My name is Shizuo Heiwajima, and I am an Alpha. I am twenty-four years old and work as the bodyguard of a debt-collector. I am the exception to the rule of Alpha's making a massive amount of money in their work; I just manage to get by. My boss is a Beta called Tom Tanaka.

I have dyed blond hair, golden-brown eyes, and, I'll admit it, a shitty attitude. I wear clothes fit for a bartender (from my brother, Kasuka, for a job that I got fired from a long time ago) and blue tinted sunglasses.

Almost everyone in Ikebukuro, where I live, is afraid of me and those that aren't are the ones that fight me and end up in hospital, or they are one of my few friends; Shinra Kishitani, Celty Sturluson, Tom, Kasuka, who are all Betas and those two high-schoolers: Masaomi Kida, who is also an Alpha and Mikado Ryugamine, who I think is a Beta.

There is one exception to this rule as well though. His name is Izaya Orihara, or as I like to call him, Flea, Louse, and many other derogatory and disgusting names.

Remember what I said about being able to tell the class of someone by their personality and job? With him, it's fucking impossible.

He works as an informant, a dirtier job than most Alphas would do for a living, so you would think that he's a Beta, but no. His personality is the most twisted, evil, manipulative, bastard-like I have ever seen, the type that you'd expect from an Alpha, not a Beta.

No-one knows what he is, not even Shinra, who has been his friend for years (though Hell knows why he stuck around that long). And for any of you thinking "Couldn't he be one of those male Omegas?" Fuck off; have you not been listening to a word that I've said?

There is no way that little shit, (his body-type: another thing that makes me think he's a Beta but his actions are like an Alpha's. Damn him for being so confusing!) could be a cuddly, gentle, child-loving Omega.

Well, at least I don't think he is.