Reddit mentions of Romeo and/or Juliet: A Chooseable-Path Adventure

Or buy one of the other books he wrote like Romeo and/or Juliet because Ryan North is awesome.

They're not on ao3 or FFN, but Ryan North, the guy behind Dinosaur Comics, has done CYOAs based on Hamlet and Romeo and Juliet.

However, there is a crack crossover with Harry Potter. I've heard it's fairly good, and you can probably find more by checking the "SHAKESPEARE William - Works" tag on ao3. linkao3(The Lamentable Comedy of Severus, Half-Blood Prince of Denmark)

psst there's also one for Romeo And Juliet.

Romeo and/or Juliet

I think there are two premises in here that could be challenged:

1. Society benefits considerably less from derivative works than non-derivative works.
   
   
2. Copyrights on net encourage creation of more works because of their long lifespans.
   
   First, I see no reason to believe that derivative works are any less valuable than new works. If they're what society enjoys from its arts, then that's valuable. It's not for me (or the government) to say that a choose-your-own-adventure version of Romeo and Juliet is any less valuable to society than any other book.
   
   On the second point, the downside of copyrights is that the fear of lawsuits will chill the creation of new works. For instance, the author of this book has not published it because of well-founded fears of a copyright lawsuit.
   
   The larger the range of works which retain copyright, the more works will be suppressed by the fear or reality of lawsuits. This is a particular problem in the area of music, where hit songs routinely attract lawsuits alleging infringement of songs from decades prior.
   
   Further, because of economic discounting, it is highly unlikely that long copyright terms encourage more creation. It is a well documented economic phenomenon that people value things near in time more than things further away in time. The difference in incentive between a 5 year term and a 10 year term would therefore be expected to be much greater than the incentive difference between a 50 year term and a 55 year term, because people care much more about relatively near term benefits than very long term benefits.
   
   Given that the chilling effect of copyright lawsuits is roughly linearly correlated with the number of copyrighted works, and that the positive incentive of copyright has diminishing returns, we'd expect the lines to intersect at some "new work maximizing" point. I would wager that point is in the neighborhood of 15-20 years, if not shorter.