It takes place in real time, present day New York City. We don't use messageboards- we use a chat room which once you join you will be given the link to. If you are unfamiliar with how to rp in a chatroom someone from the rp can teach you, just contact me letting me know that you are interested.
There are a number of species that your character could be, and a list of them including information is provided.
Sex demons are just what the name implies them to be - demons that 'feed' off their own, or others, sexual activity - just like a vampire feeds off blood. Also like vampires, if they do not feed for long periods of time, they can become weak, and eventually go into craze, and usually end up raping people. These demons can live off any species' sexual activity - be it their own gender, or different, or another sex demon, vampire, or werewolf.
Sex demons prefer their 'victims' be willing, but they if the person is not, they have magic that will basically make their 'food' feel like they must have that demon, or they just might die. However, those who can use mind-shields might use it against this magicin which case the demon might turn to it's original form and rape their victim. In their demonic form, they often also kill the person they are feeding off of, and they will give them the highest satisfaction. Most demons do not care about whether their 'food' is involved with someone else, though, and do not care about breaking them up or not. They are generally cold, unless they are with each other. They also normally do not have much feeling, other than that of survival and hurting others, but there are those who are somewhat humane.
The only large different between succubae and incubi, beside gender, is that incubi can father children (of werewolf, human, or anything else), but succubae cannot bear them. Also, succubae do owe their 'allegiance' to their queen, the oldest succubae, and daughter of the Lady Darkness herself, while incubi are simply loners, have no 'Law' or King or anything.