Shen Yuan was a beta all his life so then, now, being the omega Shen Qingqiu who can no longer suppress his secondary gender by Without-a-cure, needs to learn to be an Omega.
The information in the books is damn unclear and it would not be right to go ask for help from disciples or brothels, so he just... Well, he knows that Shang Qinghua is a spy for the demons, and he knows that Mobei Jun is an Omega for his meta knowledge. So he decides to go and threaten Shang Qinghua's ass with exposing him with the other Peak Lords for treason unless he allows him to have private meetings with Mobei Jun.
(At some point, they both reveal themselves as transmigrants? Yes. But not at the beginning for more drama lol Shang Qinghua racking his brains over what the hell Shen Qingqiu the scum villain and HIS KING will talk about in private- )
So, in private meetings with Mobei Jun, Shen Qingqiu humiliates himself with a half-truth: he tells him that I had never experienced anything like omega (after all, the entire CQMS thinks Shen Qingqiu is a beta), and now with Without-a-cure he has stopped taking his suppressants because the damage they were doing to his health, so right now he doesn't know how to do omega basic things like nest, purr, scent, pack behavior...
Mobei Jun agrees to teach him all those omega things; in exchange, Shen Qingqiu will give him more information and those things that Shang Qinghua doesn't have access to, since Shen Qingqiu is, well, Peak Lord of the second most important peak. They make a half-hearted and reluctant agreement, but they are on the same page.
And Mobei Jun teaches him. He teaches him how to fix a nest and the different ways he can use it. How apply blankets properly for softness, or comfort, or space, depends on what suits him. Teaches him to scent with the necessary amount of pheromones on people, objects, pack gifts, puppy gifts- It is a different level for each situation, and it is very necessary that it be respected, because otherwise it could give the wrong message!!
It also teaches purring, different growls, the type of reactions these sounds would have in Alphas or other Omegas. Also what kind of fabrics or robes are more comfortable to wear closer to the heat, what herbs to avoid, what kinds of things might not help him, what types of foods to stock up on for those occasions.
There is a lot of monosyllabic talk, a lot of directions and teachings, and Mobei Jun is not really the type to talk a lot, but neither is Shen Qingqiu, so unless necessary, they won't say much that is not so very important. They drink tea (iced) and they always end their secret meetings by scenting their wrists. It's a habit. Mobei Jun's omega scent is clear like ginger-mint and somewhat spicy, but it doesn't smell demonic itself, then it can go unnoticed.
The change in Shen Qingqiu's Omega behavior is noticeable, not only among the now very spoiled puppy disciples, but among the Peak Lords. Mu Qingfang is glad that Shen Qingqiu is finally accepting being part of the pack, scenting them, giving them scented gifts for their own common spaces. Alphas and betas do not necessarily nest, but in their homes they often have things with the aromas of their packs, giving shape to their home.
There is only one notable difference. Mobei Jun, of course, has taught his omega knowledge biased by his demonic family teaching. So, Shen Qingqiu finds himself... biting.
He bites his disciples' cheeks, he bites their little hands when he comes to scent them. It is easier to give them little bites, so they will only laugh or blush.
He bites Liu Qingge's cheek, one day the Alpha gets really close to him sniffing the clear scent of Mobei Jun on him, asking who is. In defense of Shen Qingqiu, he became nervous!!! And Liu Qingge stepped away as if he had been set on fire, walking away like a penguin.
Randomly bites Mu Qingfang's hands when he is checking him out by Without-a-cure, little bites on his fingers, on his knuckles. Mu Qingfang blushes, steps back, and quickly notes down the reactions. Pff. As if it wasn't normal for Omegas to bite and lick their packs!! Now they will tell that Omegas should not court their Alphas by proving they can kill them in a fight only to decide not to! Of course Binghe's harem didn't work like that, but those were female Omegas! He was a male Omega, that would make the difference, wouldn't it?
So, just, Shen Qingqiu is there, gifting his packs with things with his scent, purring when some Alpha around him is stressed, biting hands, wrists, cheeks. He shamelessly sits close to anyone and drenches them with his scent. He's much more tactile with everyone. He makes comfortable public-nesting spaces in gardens where he invites his youngest disciples (and Binghe, because how could he deprive Binghe of those experiences?! The poor boy is always hungry for affection, hugs, pats and bites more than any other disciple) to snuggle with him while purring and playing some music, just as Mobei Jun had explained that Omegas did with their pups so they could relax after long days-
(The other Peak Lords don't know if Shen Qingqiu has gone mad or is trying to court them all. They also don't want to risk asking and ruining whatever's going on.)
(Amidst all this, and instinctively, both Mobei Jun and Shen Qingqiu begin to see and feel like a pack. They give each other scented blankets, their scents are in their respective nests. There are new jewels among Shen Qingqiu's hair accessories, and new necklaces hanging over Mobei Jun's open necklines. They are a pack. Family of some strange and accidentally acquired kind. Even Shen Qingqiu relaxes in Mobei Jun's nest once while waiting for him due to an urgency among the rebellious demons - which almost causes Shang Qinghua to almost have a qi deviation when he sees him, comfortable in his king's nest just reading.)
(At some point, Shang Qinghua and Shen Qingqiu reveal themselves to be transmigrants- and Shang Qinghua is laughing his fucking shit off, because now he has the explanation of everything, and he's definitely not going to tell him that the normal omega mode of demons is the omega-courtship-family mode of humans. Nope. He'll let Cucumber-bro figure it out for himself.)
