#Also this is the small scrawny Genya bc i think it'd be cuter

[nightlight-stardust-and-rain]

KNY fanfic idea !

alpha/beta/omega setting - the idea is that when omegas go into heat, they instinctively go to the person they feel safer with. Their instincts know that this is a moment of high vulnerability where they can't defend themselves so they go to their most trusted person, someone they know will take care of them and protect them and be on their side no matter what. If an omega does not have such a person they usually go to the strongest person they know (this sometimes goes badly). An omega in heat will always know where their most trusted person is, no matter what. How ? Plot magic, that's how (if this was a modern AU idea instead of a KNY idea the police would 100% try to locate missing persons by making omegas in heat search for them). And pretty much nothing except extreme distance can stop an omega in heat from geting to their safest person.

Now that the system is established, here's the idea : Genya has his first heat after the final selection but before his canon reunion with his brother. And his safest person has always been Sanemi (it Does Not helps that finding Sanemi has been basically his only goal in life for years). So, obviously, he goes to find Sanemi.

And Sanemi is currently... In a Hashira meeting.

Because i always will be obssessed with Outsider POV, the idea is that Genya kind of just... Opens the door of the meeting room and simply goes in. It is immediately obvious to pretty much everyone what's going on - even without the very obvious scent cues, Genya has the dazed look of someone who is either feverish or in heat. And it's not even the first time a meeting has been interrupted by an omega in heat searching for a safe person - it doesn't happen often, but it has happened : the Hashira are very strong, and a lot of omega slayers feel safe with them (Gyomei, Kyojuro, Kocho and Mitsuri in particular get chosen as heat-protectors a lot). So the real question is who is this omega that no one (save for one, shocked into stillness) recognizes looking for ?

They watch him shuffle into the room, think for a moment that he's going to Gyomei (because the kid is scrawny and a lot of the younger slayers are not immune to the Stone hashira's big brother aura) and are, as a whole, shocked into silence when the boy stops in front of Sanemi, who's staring with eyes like he's seen a ghost. From what they know, no omega in their rank has ever chosen Sanemi as heat-protector (in their defense, Sanemi just does not let people in and his attitude is horrendeous). This is really surprising ! And, instead of directly going for a hug like most omegas in heat do, the kid stays standing and mumbles something that sounds a lot like 'i'm sorry, i was wrong, it wasn't your fault'. They know that Sanemi would not leave an omega in heat hanging, but it's still surprising when he heaves the biggest sigh they've ever heard him make and opens his arms, allowing Genya to bundle up into his side as if it's completely natural to him (it is). He then glares at everyone else (Genya fell asleep instantly because this is the biggest relief he's felt in years) and just resumes talking about recent demon activity like nothing happened and they all have to deal with Sanemi Shinazugawa having a scrawny kid cuddling him for the rest of the meeting.

(the more observant among them will notice that they have never seen Sanemi less tense, and that even with how hard he's trying to hide it, he's happier that they've ever seen him be).