'More often than not, due to the highly sexual nature of both these creations and their masters, a high-ranking Diabolical may create himself a harem of Succubi/Incubi (sexual preference amongst Diabolicals isn't... really all that picky) to entertain themselves with. While sometimes a Diabolical may feed his creations tiny portions of his own massive life-force, it is more common that he/she feed them from captured mortals, prisoners-of-war or even his own underlings.
'In their natural forms, Succubi and Incubi are generally similar to the common lore - Roughly human-sized, with leathery 'demon' wings, long, slender tails, and claws on both hands and feet. Some can alter the size of their body parts (including genitals) to better please their mates and/or victims, though this ability is generally learnt rather than innate.
'Contrare to common belief, Succubi and Incubi often take life-mates amongst their own kind, though they do not breed, having been disallowed such a privaledge by their creators. Despite this, they do not consider such a partnership to inhibit their seduction of other persons - Sex isn't part of a relationship to them.' - Orinthia