How to summon a succubus?

http://www.angelfire.com/empire/serpentis666/Incubus.html

No such thing as a 100% guaranteed spell. Despite the spell itself, there's no accounting for your ability. And regardless of the little quick spells everyone's posted, summoning something actually takes months or even years of practice. Usually years. Then you have to fast, and prostrate, and perform tedious rituals, with various requirements. The fact that you have to post here and demand the spell tells me you're not prepared to summon anything. That all being said, it's unlikely that Incubi or Succubi are even real. The phenomena are most likely a combination of sleep paralysis and nocturnal orgasms.