Succubus

A succubus is a stunningly beautiful woman. Her voluptuous form is squeezed into a tight leather bodice. Large bat wings unfurl from her back, and she lets out a short gasp as she cracks a small whip against her milky thigh. A succubus is pleasure and pain rolled into one deadly package. Like all demons, she enjoys bringing death and misery to the mortal races — but that doesn’t mean she can’t have fun with them first. Many warlocks choose a succubus as a fel companion for their ability to manipulate those weak of will. It is not uncommon for a succubus in a mortal’s servitude to fall uncontrollably in love with him or her; this occurrence is not always to the master’s advantage, though, for a devoted succubus can be prone to fits of extreme jealousy, especially when her master deals with those of the opposite sex. A succubus usually tries to avoid direct confrontation, preferring instead to use her natural (and supernatural) charm to gain a creature’s trust, then to lure her victim into a defenseless position. In open combat, a succubus is far from helpless, however. She is surprisingly agile, always attempting to feint or flank an opponent, thus allowing her to backstab with her lash of pain. Most warlocks tend to trust their succubus’s natural instincts in combat. This trust comes as much from respect for her abilities as it does from the realization that a succubus may ignore an order she doesn’t agree with anyway. This is especially true when an opponent threatens her master directly, as she may become reckless trying to save him.
Succubus/succubi is likely the Common terms and sayaad the Draenei term for the race. Though succubus might be a class/faction within the race. Sayaad are the race of winged demons from which Succubi, Anguishers and others types originate. The plural form is "succubi." They are predominantly loyal to the Burning Legion. As with Harpies and Shivarra, no information exists on males of the species (it is unknown if male sayaad even exist) who would properly be called incubi. Incubi were given a very brief mention in the Last Guardian.