Incubus is a demon in male form who, according to a number of mythological and legendary traditions, lies upon sleepers, especially women, in order to have intercourse with them. Its female counterpart is the Succubus. An incubus may pursue sexual relations with a woman in order to father a child, as in the legend of Merlin. Religious tradition holds that repeated intercourse with an incubus or succubus may result in the deterioration of health, or even death. From Wikipedia
Nothing new here, just a demonic attack. Most people think demons or demi gods bring luck and can be utilised for their desires. Sadly thats not true,
eventually the demon does what it wants.
Its not a joke, these encounters are all to common and become very serious. Demonic sexual attacks are well documented.
Do a search on youtube if you want more information.
Christianity accepts both these demons as legitimate entitys.
They are both subject to Jesus authority if you need assistance.