The Evil Dragon Drains Its Contractor? Sorry, I'm a Perpetual Motion Machine

Everyone fears the Evil Dragon—the cursed contracted spirit that drains shadow power until its summoner dies. But what if your contractor is a perpetual motion machine who can't run dry? In a world where awakened humans bond with beings from the Shadow Realm for power, Lan Yutian breaks every rule by contracting the infamous Evil Dragon—who just happens to be twin Dragon God sisters in black silk maid outfits. While others struggle with A-class spirits or S-class angels, he's discovered the truth: the Evil Dragon doesn't just drain power, it replenishes it a thousandfold. The catch? You have t…