"Sun and Moon" by Jennifer Soldan

Jor El and Troy, from back in the day. They're twins, yay. Random facts: Jor El is the most skilled Equiano (at weilding Equiano magic) seen in nearly an age, while Troy is the only Equiano ever known to be unable to weild Equiano magic. Troy is 6'7", while Jor El is only 6'. Troy's height is considered average for an Equiano, but Jor El is considered short. Jor El is chosen as steward to the throne of Suldar, but later sucumbs to his dark nature (Equiano have a dual nature) and basically becomes a dictator. Troy is chosen as the true heir to the throne, which more or less creates some family tensions. :)

This is before Jor El becomes evil (his hair is still white). And they're not gay; Equiano men just dress very femininely, and considering their height, of course, they're shockingly skinny.