Sincubus

History
Female succubi and male incubi (collectively sincubi) have lived alongside humans for nearly as long has humans have existed. A parasitic race, sincubi feed upon the various forms of energy humans generate passively.

Over time, sincubi have evolved divergently into many subspecies, each with different sustenance requirements and hunting or seducing modus operandi. More information on sincubius subspecies variations can be found here.

Appearance
Although sincubi can vary greatly between subspecies, all share several common traits. As sincubi are parasitic, they must in some way be able to feed from their host.

Most sincubi share the following physical traits:


 * Humanoid
 * Although in many cases, sincubi are immediately distinguishable from humans


 * Two legs (bipedal)
 * With the exception of the siren, and the partial exception of the kappa which is able to move quickly on all-fours if necessary

Diet
As sincubi are parasitic, they must in some way be able to feed from their host. In all known cases, sincubi feed on some form of energy created by humans.

A sincubus may sustain itself on raw meat, provided it is fresh enough. However, most surveyed sincubi have commented that this is a distasteful diet and usually only maintained in order to integrate into human society.

The following are the forms of energy on which sincubi are known to feed:

Natural Energy
Natural energy usually refers to the nutrients and water held within the body of the sincubus’ victim. Some sincubi feed indirectly on what the victim has eaten by absorbing nutrients through its skin, semen, or blood.

Sexual Energy
Sexual energy is the most common form of energy consumed by the sincubus: the feeling of climax at the conclusion of sexual intercourse. If a sincubus feeds on their victim’s sexual energy, the victim is likely to notice a shortened sexual climax and/or other side effects including a decreased lifespan, organ failure, and death.

Some sincubi feed on a more subtle type of sexual energy that does not rely on orgasm called progressive sexual energy. In this case, sexual energy is absorbed in such a way that it may be unnoticed. Note that older, more experienced sincubi can feed on such small amounts of progressive sexual energy that it is very difficult to distinguish between a sincubus feeding on a victim’s sexual energy and its normal, albeit slightly low level of virility.

Potential Energy
Potential energy is the energy which the body has been storing but has not yet expelled. Usually, the body stores enough potential energy for several days, but subtle forms of potential energy, such as the form consumed by the Breviloquent succubus, can be stored in the body to be used as fuel for years of emotional and physical stability.A loss of potential energy results in a depressed or saddened manner, or lack of physical energy. It is common for people who have lost large amounts of potential energy to mope and display a distinct lack of energy output.

This form of energy is not to be confused with present energy, which is the output of energy in the immediate present. Present energy can also be stored for up to two days (energy from food, sleep, stimulants, etc).