The sites below offer you a "choose your own adventure" kind of story.
Choose a site,
Compose a story,
Copy or link the story to your site.
https://docsstorybuilder.appspot.com/
http://www.wetellstories.co.uk
http://www.nationalgeographic.com/west/main.html
http://www.talesoflondon.org.uk/?PHPSESSID=ac9af1988b28086211bb5aff4a52a2ad