Nyx Prophecy: Douchess Leylia (Patreon)

The demoness Leylia was the result of an ancient prophecy of the nightcouncil.

Under her command, the two Necran Houses Atocrat and Heistocrat reunited and rebuild the occult organisation known as the Nightcouncil.

Leylia is a part of an ancient Merran race known as  Douchesses. 

Douchesses are immune to all kinds of Transformation Merra has to offer and can never truly die. Even when killed, the soul of a Douchess can always be summoned by an ancient Necran ritual

Their magic mainly focuses on mind-control and body-takeover. In addition, their curse constantly swaps taste and smell of her victims tongue (and spit) with the tongue that is hidden in her crotch. This curse alone is often enough to break the will of her victims, since they now taste all the details when the douchess has sex.