Student has longterm crush on teacher. Father walked out a few years previous when mother fell ill, leaving student to find job to support himself, mother, and siblings. Finds work at a club on the edge of town as a dancer... Teacher eventually finds out. Could go a few different ways...

youngest heir to Tharios' crown
older brother already contently situated on the throne with a wife and heirs of his own by the time Aren reaches an age of sexual discovery.
has always (secretly) enjoyed his sisters 'forcing' him to play dressup.
starts crossdressing at age twelve

catches the interest of the heir to the Amarin lordship (in Amarin, females are forbidden by law from ruling. Fathers property until wed (essentially sold) to husband, then becoming his property instead. Hence Torricks older sister Keane not being named as heiress; law has been abolished in the rest of the country)
Torrick Amarin begins courting Aren, unaware of young prince's true identity
once discovered, enraged that he's been made such a fool of, Torrick rapes Aren.
now 'disgraced', he is forced into marriage with his abuser (goes for any male or female of Kelarim who is a victim of rape)

Aren (aged 15 at start of story)
Torrick (aged 19)

Aren's Siblings:
Azrael (aged 30; 15 years older)
Astoria (aged 28; 13 years older)
Adrian (aged 26; 11 years older)
Ariena (aged 23; 8 years older)
Alencia (aged 19; 5 years older)