Long time reader, first time poster, but I had to ask, I've written a short story wherein the world it's set in (Metropolis) is lived in by batman (but a future where Robin took over the mantle), and a whole host of superheroes (like Spiderman married Wonder woman, The Thing does specialised porn etc), and Superman (now married to Lois Lane with a son), but the main story's about the son of superman and a new Robin - and it's (supposed to be) humourous.
If I tried to include it in a book selling on Amazon and itunes, would I be looking at troubles? bearing in mind, the story probably wouldn't work if I had to substitute the heroes.
I'm wondering if satire wouldn't cover the fair use thing. Thanks for any help.