Off in a world of fantasy, a knight was given the order to adventure out into unknown lands to slay powerful monsters in defense of the land. They gear up and prepare to leave by dawn to venture off into the unknown. However, the beasts the knight will encounter have other plans for any humans who wander into their domain. They will transform the knight into a powerful creature of sex and power through sexual and magic interaction. After all, the monsters only want one thing: to make the world see it all as how they do.
What gender the knight is, their body structure, their personality, their weapons and gear and overall inventory, their abilities and skills, and who they may be travelling with is all up to the writers.