My Rotten Stepbrother Ruined Cinderella

Holden, what have you done?! It wasn't enough to ruin Maddie's report on Cinderella, but now you've somehow broken the ACTUAL fairy tale? The ugly stepsister is marrying the prince and there's no happy ever after! You need to fix this and the only way seems to be by entering the story. But beware: if you can't mend it, you can never return . . .