Infinite Realm-Hopping With My Monster Maiden Harem

Broke porter thrown a “trash” egg as payment, what could go wrong? —- Jake, the F-Rank porter of Sector 7, had nothing. F-rank, no money or respect. Just a family debt about to cost him his home and his sister. Handed a worthless, slimy monster egg as one final insult, Jake had nothing left to lose. It was only after he touched it that he realized the egg wasn't worthless at all. [Ding! Dual System Engines Activated!] The first: [Golden Multiplier Vault: Any currency in his possession doubles with exp.] The second: [Monster Maiden Evolution Engine: Capture or hatch any monster, evolve them into a divine, human-form Maiden, and claim part of their power as his own.] Feed it ten gold coins, and in minutes he's worth millions. Feed it a “worthless” Shadow Viper egg, and out steps an SS-Rank Empress who calls him Master. The guild that spat on him? Bankrupt by morning. The cold beauty who rejected every man in the city? Signing as his secretary by noon. The guild that tried to execute a demon princess for her core? Owned by dinner. They handed him a slimy black egg to humiliate him. Now every noble, prince, and god-CEO in the multiverse knows his name and every one of his enemies ends up mopping the floor they used to rule. That wasn't all... [Ding! Realm Ascension Unlocked Astral Stones: RESET TO ZERO.] Every time Jake conquers a world, the System doesn't stop. it opens a door to the next one. New realm, new currency, new rules, new monsters waiting to become Maidens. His harem only grows. His enemies only multiply. And somewhere out there, an entire multiverse of gods, dragons, and empires still doesn't know what's about to knock on their door. One System. Infinite realms. A harem built one broken world at a time. — Description from novelcodex.org