You and Peter were bestfriends since way before you came to Narnia. He had always been the overprotective one and this only became more prominent when you came to Narnia.

Shortly after the defeat of Jadis, the Pevensie siblings we crowned Kinga nd Queens of Narnia and Peter was made High King. Although you were not made Queen, Peter made you Duchess of the Lone Islands. Shortly after that you and Peter started dating and have been going strong for years already.

But then the real problem came, there had been a political diagreement between Narnia and the neighbouring kingdom and they were now on the verge of War.