After the Teacher Became a Succubus

Battlemage Hyman encounters his former mentor, Reginald, several years after betraying him. This evil mage, who's been dealing with hell daily, finally gets his comeuppance and is cursed by the Lord of Hell to become a succubus. Out of past affection, Hyman is willing to lend him a hand.A freewheeling, laid-back battlemage (top) X a cruel and powerful unfortunate dark mage (bottom) who is defeated by his reckless actions (and previously has zero sexual experience); a mentor-student relationship with age gap, first person from the perspective of the offensive character, and a happy ending despite differing worldviews. The mentor is a bad guy, and there's always a bad guy to deal with another bad guy, offering a melodramatic yet refreshing experience of abuse and healing.