Getting Into Character

Through use of a magic book, pen, runes, seals, symbols, power, or whatever, you've gained the ability to control people into being what you want. How? Simple, you write out a story and then have them read it, while making it clear that a character is "based" on them. The magic works the rest as it seeps into them and makes them want to keep reading, but OH NO! You've not finished the story and they need to know what happens, but you're suffering writer's block and need them to help you. How? By becoming just like the character in the story that is based on them so you can get inspiration to finish it.

Of course, by the time you actually do "finish" the story, they'll be too happy staying as their characters to want to stop, especially if you may write sequels to the stories.

So for instance, Naruto could write a story about how a girl names Sakura became the personal relief whore for her best friend, and after reading it, Sakura would become Naruto's relief whore for as long as he needed to get the story going.

Or perhaps Mineta Minoru writes about how Momo becomes the personal slut girlfriend (and later wife in the sequel) and she will become that to help get the story finished.

Or Chizuru writes about how Orihime becomes her personal slut maid that loves to do everything her mistress orders her to do.

Or maybe you write that your mom is a cheating slut who wants nothing more than to cuck her husband by fucking her stud of a son while your dad is a submissive wimp of a cuck that will never be able to stand up to you or your new bitch.

Basically, anything the "character" is, the girl (or guy if you so desire) will become and will remain that way unless you write a new character for them, though be careful, too many characters in their minds could cause problems and damage to them, which is why it's recommended you write a new story and just have the character develop/change rather than just smash a new character into them.

There's also the matter of if you have negative side effects from using the item/power in question since you will be using magic to affect people and thus there could be drawbacks, but that's up to you to figure out.

(Public Story, feel free to add chapters)

(Cover image girl is inori Ooeyama from Tsuyokiss)