My Three Beautiful Heroines Are Very... Strange

My life had never been normal, from my first transmigration to battle and defeat the demon king, and now I'm back in a world similar yet different from the one left behind. Turns out life still progressed even with my transmigration, the world was now battling gates where creatures from my other world were bleeding into this one. And to make it all worse I was back to mediocrity, working in Amazen with no escape in sight. But that wasn't what changed my life. “Twenty years.” She said it and I could already feel an elf-sized migraine I knew would be there forever. My life was ruined yet again. --- What's the fastest way to go from a broke, jobless, homeless pretty boy—yes, I had to add pretty boy—to a millionaire, after legal fees that is? A lawsuit. Grey Coleman was your regular millionaire who went off the grid to avoid friends, family and the world—but somehow ended up buying a property with an interdimensional portal. Too lazy to move he begins his journey slaying the strange beasts that scurry out of the portal in his backyard every night. With the help of my newly found system it was relatively easy and mundane life until someone new stumbles through the portal. Not a beast by any means but a beautiful Elven princess with a sharp tongue for a relatively little frame. “But wait, why's she trying to seduce me? And why does she think I'm her fated mate?” And she's not alone... — Description from novelcodex.org