Many people ask exactly what is an incubus or a succubus? You can get different answers and they can al be different. An incubus is a male version of a sexual demon who like to come to woment at night while they sleep and have sex with them. The same thing goes with the succubus only they are a female version. They say that incubus and succubus sleep on top of the person they are having sex with and drain their energy until they fall ill or even possibly die.
It really does depend on what you believe in demons, everyone has their own beliefs and opinions on them. Some think they are evil and menavolent. While others say they are just another spiritual form of some type. Demons are not evil in anyway shape or form. Incubus and Succubus are sexual demons they come from the spiritual realm of Hell. Of course they can come from other parts of the spirtual realm as well, it just depends how you believe and feel abou them.
I know its not much but i am trying to learn more about demons and where they come from and their mythology and history. I wrote this post on my own.