Fics like I Was A Hero In Another World But My Dog-Girl Slave Swapped Places With Me And Now I Can’t Disobey Her

The Hero From Another World was overpowered, moving faster and with more strength than anyone in the world, in ways that trivialized combat with enemies... but that doesn't mean he understood how to navigate a foreign culture, much less change the systems within in it he disapproved of. After gaining the enmity of his former ally Lady Wren, he complains to his rather dumb but kind slave girl Sasha that he'd like to switch places with her and live her comparatively easy life. To his surprise, she does just that-- and it turns out she's not as dumb or kind as he thought. And the life of a slave girl is much, much, harder than he thought, especially under her cruel hand... despite her claim to want to end slavery in the kingdom altogether.