Arthur's Sons (Book 1)

What if Merlin was born female(Merlyn) and she and Arthur met a few years before Camelot and after a night together before Arthur returned to Camelot she found herself carrying the twin sons of the prince of Camelot. When Merlyn arrives in Camelot with her twin sons she discovers the father of her children whom she thought to just be a knight of Camelot, is instead its Prince and after saving him from a vengeful witch is forced to serve him as a maidservant. Will Arthur discover the truth about the two boys? And will he be able to handle the weight of his crown as well as being a young parent?