This is kind of a multipart question - How many books are you planning on writing that take place in Noah and Echo's world? Will everyone get a book of their own, or will there be some supporting characters only - and if so, will they get a novella?
Have you ever thought of writing something outside of this world? Not that I want you to right now, as these books are amazing, but in the future?
Here is the breakdown of the Pushing the Limits series:
Pushing the Limits Crossing the Line (e-book novella that has also been printed in the hardback of Take Me On) Breaking the Rules (e-book full length novel in US/print edition in UK) Dare You To Crash Into You Red at Night (e-book novella) Take Me On Chasing Impossible The Proposal (an e-short given away with the purchase of Walk the Edge)
Thunder Road series:
Nowhere But Here Walk the Edge Long Way Home
Stand Alones: Say You'll Remember Me (January 2018)
Will there be more books in the Pushing the Limits series? I've learned to never say never, but I don't have plans at the moment.