Art by  crimsonsnow

Celestia is two-thirds demon, not half, for the simple reason that she has two succubus fathers and a human mother.
Her mother is Suzanne Goldsickle, one of the most powerful demonologists known during her active life. Following certain events, she formed a lifelong bond with two succubi, Vishena and Desdemona.
The latter settled in the mortal world to form a family with Suzanne. They had no trouble finding work as demon consultants.

Celestia loves her family, but tends to be bored by her parents' wild side. She's jealous of their active sex life, while on her side it's dead calm. She's got an impressive triple equine penis, and a prehensile one at that. Terrorizing all those she'd hoped to push further than her love affairs.

Now an adult, she continues her studies in demonology at one of the leading universities in the field. She knows she had easy access thanks to her mother's reputation, but she insisted on passing the entrance exam, which she passed with flying colors. Now she's making a life for herself and even starting to make friends.