Do you remembering any of the "Choose Your Adventure" type books? At various points in the story you have a choice to make. Depending on what you choose, you go to a different page in the book, over and over making each reading somewhat different.
There is a great series that uses this same approach but deals with moral decisions, peer pressure, etc. At my last check there were 5 books in the series [$6-10 each], plus a leader's guide [$15] available for the whole series.
Each book is around 60 pages total, but depending on your choices, the actual story length varies. Great for readers 7-12 or a bit older if they struggle with reading.There are several different authors who contribute to the series and the topics are all situations that children face all the time. The same publisher also makes a similar [reader choices] series for ages 4-10 called Kids Can Choose, but I haven't seen any of those myself so can't actually recommend them yet.
The Decision Is Yours series:
Finders, Keepers : What should you do with the wallet and money you and a friend find.
Making the Grade : More time on soccer than homework and a bad report card make a tricky mix.
First Day Blues : How do you make friends on your first day in a new school?
Bully on the Bus: What do you do if an older kid in school threatens to beat you up?
Under Whose Influence? : To drink with friends or not?
I am a lifelong educator, writer and author, a foster, bio, and adoptive parent, happy mom of five daughters, Grandma to six, Nana to four, and church and theater musician. Oh yes, and all-round optimistic, crazy lady.