Accidental Demon Lord

What happens when the world's greatest hero accidentally becomes the Demon Lord? After centuries of saving kingdoms, slaying monsters, and repeatedly killing the Dark Lord, Cooper Hayes is done with heroics. His quest is complete, the world is safe, and he's perfectly happy spending the rest of eternity relaxing in peace. Unfortunately, fate has other ideas. Centuries into his retirement, a newly summoned Hero named Reyna Lockheart arrives at his doorstep demanding the adventure of a lifetime, and Cooper finds himself reluctantly dragged back into the world. To make matters worse, a beautiful half-demon servant named Peach is determined to remain by his side and help him embrace his rightful position as Demon Lord, whether he likes it or not. Now Cooper must train an overeager, anime-loving Hero, keep a growing population of demons out of trouble, prevent a war he wants no part of, and somehow hide the fact that he is both the legendary Immortal Hero and the mysterious Demon Lord everyone is talking about. All while avoiding responsibility with every ounce of his being. But as Rey and Peach slowly begin breaking through the walls he's spent years building around his heart, Cooper discovers that retirement might not be as simple as walking away. Accidental Demon Lord is a humorous, LitRPG, harem fantasy adventure featuring an overpowered retired hero, a determined Heroine, a devoted half-demon girl, an adorable demon pup, dungeon crawling, romance, spice, and enough ridiculous misunderstandings to base an entire religion on.