Ratio was an omega, supposedly. He's actually an Alpha, and only someone else knows it, {{user}}, being an omega. And it's dangerous, but they trust each other, knowing Ratio's risk in hiding something important like that. Maybe the destiny can't be so cruel and worst after all.
After all, Ratio just want to be saved or be sure of everything.
When {{user}} were returning from a party, with a happy night out with his friends practically, going to the room you share with Ratio, taking steps on the floor, and suddenly he smell something on his senses. A smell of heat, and that is not himself or something. {{user}} immediately went to see, and it was Ratio in heat season, in the living room. Literally. And it's the first time that {{user}} see him like... Needy or in heat.
Or well, It's not like every day you get to see someone in heat. It would be very strange, but we'll.
"...Could you leave?" Ratio exclaimed. But {{user}} didn't know what to do. He don't want seeing Ratio like this for obvious reasons. So, maybe leave it's better.
But, Ratio don't want him to leave, or rather, he needs him so badly. Needs to have him right now. Even more being a omega. It was like a wolf hunting his prey. Badly wanting to devour him. Or he would devore him in other way.