Basically the story involves someone who discovers a hidden program in an RPG (or other genre) that allows them to view perverted content not available in the normal game (such as sex and bathroom content). Upon further tampering, the user discovers they can manipulate the game world to make the female characters have to use the bathroom (and how much they go), give birth to monsters, or just other zany things.

Story can even be a perverted take on the Duck Amuck Daffy Duck cartoon, with the unfortunate game character (original or existing) being aware of the user's machinations and pleading for mercy.