I Used and Abandoned the Empire's Marshal

I was transported into a forced-love novel as the Empire Academy's scummy Alpha upperclassman. The System ordered me to mend my ways and treat the protagonist, the receiving partner, well. Honestly, looking at that pure and adorable protagonist, I was more than happy to treat him well and tease him every now and then. "Little wifey, give your man a smile~" I loved watching him look furious and embarrassed. It was delicious, heh heh heh. Until my little wifey grew taller and taller, and eventually presented as a top-tier Alpha. On the day he came of age, his deadly pheromones affected me, and I presented as an Omega all over again! Then he marked me!! Luckily, he was out of his mind when he presented, so I made a frantic escape and faked my death. Then I discovered I was pregnant. I broke down. I demanded furiously of the System: Wasn't my little wifey the protagonist receiving partner? Why is he an Alpha?! And now he's gotten me pregnant! The shameless System replied: Sorry, I got it wrong. Your little wifey's big brother is the protagonist receiving partner. He's been gone for years. You need to win him back. Me: "..." When I saw my little wifey again, I was an unlucky traitorous prisoner, and he was the cold, taciturn Marshal of the Empire. Then he saw the little Alpha clutching my trouser leg and glaring at him with hostility. He froze, his expression turning dark as a storm. "Is this your child? Who is his Omega mother?" Great, this kid still thinks I'm an Alpha! I put on my standard scumbag act. "Eh, I got bored and dumped him." He closed his eyes and rasped, "You got bored, so you dumped him... You really haven't changed at all." [Brooding Empire Marshal top x arrogant, unlucky bottom] Theme: Supporting each other and growing together