Help! My Love Rival Turned Omega Because of Me

Short-tempered queen bottom x thick-skinned husky-like top (rivals-to-lovers couple) After six years as coworkers and fifteen years as classmates, Park Suheng and Yin Chuanze had been bitter rivals from school through their careers. Then they both fell for the same O, becoming romantic rivals and making their relationship even worse. Even their subordinates couldn't stand the sight of each other. But that person strung them both along for three years, then turned around and attached himself to a big shot in the capital region. Thinking they were in the same boat, Park Suheng dragged Yin Chuanze out to commiserate and vent. They drank some fake liquor, and somehow things got indecent. At first, neither of them paid it any mind. Park Suheng was especially quick to forget, until one day. Yin Chuanze kicked open his office door and barked, "Get over here! I'm in heat. Bite me!" Park Suheng: "..." "Dude, aren't you an A? How can you go into heat? Had too much fake liquor?" The aloof Captain Yin was ruthless and didn't waste words. He locked the door behind him, pinned his rival against the desk, then leaned forward with the back of his neck exposed, the corners of his eyes red. "Make it quick! I have to go out on a mission in twenty minutes!" From then on, Captain Yin kicked open the door to Park Suheng's office countless times, and every time, the person involved didn't dare utter a word. Later, he even kicked in several doors at home. The aloof Captain Yin would go all out against him at work, while ordering him in a cold voice to wait for him after work and go home to take care of his heat. As soon as they were done, he would kick Park Suheng off the bed and leave without a second thought. Park Suheng felt both thrilled and miserable, and kind of pitiful too. It was like he was being used as a tool! But his wife had been an Alpha to begin with. Wasn't it normal for an A to be a little violent? And if he was forced to become an O, wasn't it understandable for him to take things a little far? Three months later, the AI System popped up a marriage and childbirth protection alert, forcing the two of them to get married. Yin Chuanze kicked the door open with the test results in hand. "Look what you've done!" Park Suheng was dumbfounded. "Chuanze, which time are you talking about? If you weren't satisfied, I can do better next time!" Yin Chuanze replied coldly, "The marriage and childbirth System doesn't allow abortions. Find a black-market clinic and get rid of it!" Park Suheng was horrified. "No, no, no! It's my fault you turned into an O. I'll take responsibility to the end." Yin Chuanze: "You think you'll get to screw me for the rest of my life? Dream on!" The next day, they submitted their marriage application. After they got married. Teammate A: "Boss, that Yin guy is way too arrogant. How can he kick the door in every time?" Park Suheng sighed, wiped his face, and said, "We need to get a softer door so he doesn't hurt his foot!" Teammate B: "Boss, you can't be such a pushover. We need to show their team what we're made of!" Park Suheng tossed out a red marriage certificate and submitted a marriage leave request through the internal System. "Who cares if he kicks the door? As long as he doesn't kick me." Teammate C: "Boss, act like you used to! Yin Chuanze can't even beat you!" Park Suheng shot him a sidelong glance. "Domestic violence is illegal. You're going to retake family law a hundred times!" His teammates: "…" Damn it, the boss betrayed us. Those two bitter rivals actually got together! Park Suheng is the top, Yin Chuanze is the bottom, rivals turned lovers. There may be a pregnancy plot. ABO with my own worldbuilding. Both are Alphas. The bottom is still an A, but has become the top's exclusive O, with no way to change it back. Maybe this counts as an EA relationship? I still like this old-school setup, where they say one thing and mean another. Haha, I'm just writing for fun. A sweet little story, about a hundred thousand characters, and then it'll be over. Theme: Reconciliation with oneself and becoming someone new.