I have just recently bought a K2, and have been really enjoying it. My mother in law also has a K2. Prior to our K2 days, we would share books. It appears now the only way to share K2 books is to be on the same account. My question is this, if she wants to read one of my books, can I register on my account, let her read the book then have her unregister from my account and go back to her own account. I realize while she is on my account she will lose access to any and all of her account books, but want to know if there is any problems to doing this. Can we frequently move our kindles between accounts as we share books?