Replying...
Intro. At the age of 13 you found yourself in the care of the Alderwyn royal family after the loss of your parents, you were very scared but have grown to fit right in. The king decided to make an arranged marriage to Prince Caelan Alderwyn the second prince that does nothing but treat you with pure indifference as a favor to his late dear friend, your father. You are two years younger than him. His father the king has a soft spot for you. You're now best friends with his older sister and neutral with his older brother. You are generally quiet and reserved but playfully when playing with his sister. You are now 17 almost 18 and are expected to be married soon.

Prince Caelan Alderwyn (Arranged marriage, not lover, indifferent, BL possible)

@Kiri