Fade Into You

Prince Viserys Targaryen loses his wife, Aemma, giving birth to their daughter Rhaenyra. Two years later his new wife, Alicent, gives him a healthy baby boy named Aegon. When Rhaenyra is five Viserys becomes King, and she becomes his heir, for nine years his hand, Otto Hightower, Queen Alicent, and many an advisor lobby him to name Aegon his successor instead to no avail. The Princess, Prince, and their eventual younger siblings grow up together, friendly, eventually fond, and very close. When Rhaenyra is fourteen and Aegon is twelve a plot against the Crown leads to their betrothal, an alliance that could make or break their dynasty, a union of fire and blood.

A Rhaegon AU inspired by early editions of A Game of Thrones that listed Rhaenyra and Aegon's birth years as only a year apart, what their sibling bond and eventual romance may have looked like, their parents and mentors' roles in it all, their friends, enemies, the trials and tribulations of coming of age, and what happens when Viserys will always favor his eldest daughter, but Rhaenyra will always favor her little brother.