Lucas Everett and...Aeryn Taylor :O

What am I talking about? Well, I've been dying to try writing a book where the characters (at least the main characters) from my other books interact, become friends, enemies, and form friendships. Or even become an item, as my title suggests. It would be pretty interesting to write about Aeryn from TS lusting after Lucas from STA. I wonder what our poor Avery would do. And what would the best friends do? I can totally imagine Jane and Aeryn going at it like the two crazy people they are :P

And it would be so interesting to see what the characters think of each other. If I ever wrote something like this, I'm thinking I'd pick one character and write the story from her point of view (writing from a guy's point of view is a challenge I'm still afraid to take on. He'd probably end up so feminine that people would accuse him of being secretly gay).

I've only read one series of books like that and did like it. Anyone ever thought of writing a series like that? Anyone ever read a series like that? Was it good or bad?