1979’s Sorcerer’s Son is the first volume of Phyllis Eisenstein’s secondary-universe fantasy series, Book of Elementals. Sorcerer’s Son is a coming-of-age novel.
Sorcerer Smada Rezhyk proposes marriage to Sorcerer Detivev Ormoru; she declines with a simple “no.” Rezhyk concludes that this must indicate hostility, indeed must show that she is bent on his destruction! Aware that his bitter enemy’s command of nature makes her a formidable enemy, Rezhyk dispatches his most trusted demon Gildrum to distract Detivev long enough for Rezhyk to forge invincible armour for himself.
A direct attack would invite a direct response. Therefore, Gildrum takes the guise of a handsome young man named Mellor, the better to seduce the sorceress.
The demon is successful beyond their wildest dreams.