This Outer-Domain Evil God Reluctantly Became a Live-In Son-in-Law for the Corrupted Empress

To devour the celestial star systems that ravaged the three thousand worlds, this Evil God from Chaos destroyed countless lives and races, only to be stopped by an empress who had a cheat and knew how to wield a sword! She pinned me down and ground me into the dirt for hundreds of years! I nearly got shoved out of the celestial star systems, but seized a fleeting moment when time and space across them were thrown into chaos and reversed the past! To successfully devour all three thousand worlds, I first need to find the Sword Emperor and keep an eye on her. Better yet, I could marry her. Being her live-in son-in-law doesn't sound too bad! And then... skip ahead to raising kids and having babies!?? Plan coming together??