It’s not that. The idea I had for the story is this.
The female knight goes off to save the prince from an old hag witch that kidnapped him.
She gets captured by the witch and is imprisoned.
While in prison, she finds the witch is not a beautiful, busty, bubble butt woman that is a MILF now.
The prince is fine, and she learns that he was kidnapped but ran away with the witch., after she was banished from the kingdom.
The witch was his caretaker, because his father, the king, is a douse.
While hiding out, the witch found a way to make a young potion by using the prince’s royal blood.
After it worked, they soon learned that they can product keep each other young forever by his seaman and her milk.
The knight joins in, and the three live happily ever after. By either building their own kingdom, or dethroning the king.