Princess/Prince Ry

The kingdom of Sudarnia’s King is without a male heir. Ry was born a princess. Her twin brother died as a child. He was heir to the throne. Leaving the king with only Ry. Forced by her father to pretend to be her deceased brother. She becomes Prince Ry. Heir apparently to the throne. She falls into the world of men. Battle hardened, linguistics, peace treaties. A male’s education. The time has come to form an alliance with neighboring kingdom. Through marriage. Ry is not quite sure how this is going to work. She is a woman pretending to be a man. What will her intended do if they find out?