Miatapaul: It was my understanding that the Nook can run a Kindle application. Is that not correct?.
There's a Kindle app that will run on Android tablets and phones. Nooks are built on Android, but B&N limits the functionality to prevent "non-approved" apps from running. Not surprisingly, Kindle software is "non-approved." However, Nook Color and Tablet can be easily hacked to run the full Android OS, and then Kindle app for Android is easily installed on it. (I have actually done this with my Nook Color.)
Nook Simple Touch can theoretically do the same, but the e-ink display is so slow that the full Android does not run well. (I have not tried this, but my carpool buddy refused to listen to my warnings and tried it anyway. He was very unhappy with the result.)
Since I have a Nook Touch, I have made this conversion for other Kindle books that I purchased from Amazon, but in this case I've borrowed my son's Kindle so I can borrow the book from Amazon Prime's lending library. The lending library is only available on Kindle hardware.