Personally I never thought of befriending an entity like a succubus. Succubi and inccubi (the male equavilent) are not friendly. They are predatorial and when latched onto you, they can be very hard to get rid of (not unlike any other diabolical influence). Someone else might disagree with me and thats cool. But from my point of view if it looks like a bear, walks like a bear and sounds like a bear - don't assume its a playful kitten. My concern is that wanting to and attempting (you mentioned having already tried to summon one) to get involved with this kind of entity you know could be harmful might hint at some underlying issue. And I'm by no means saying your nuts. If I thought you were I would have hounded you out of here long ago. I think you are a valuble member to these forums because you present challenging questions like this one and make useful contributions.
But seriously take a look at your life and what might be motivating you to consort with a succubus. If that motivation has no practical function, in other words if your real intentions of meeting a succubus are not for a useful goal, then I would just not even attempt it. Perhaps the only problem is that what you think a succubus is and what I do are not the same thing. One thing to consider succubi like to attack while a person sleeps (because they are volunerable and often unable to fight back). Its possible you may be calling a succubus not realizing that you've already contacted one and the reason you are not aware is because it is feeding off you while you sleep. Keep in mind the nature of these entities. They are not out to make friends. They crave the life force of others and prey on them and that is what they do. You may desire to befriend one for whatever purpose, but the succubus only has one purpose - to feed.
There are far more practical entities to summon that would be more suitable as friends, guides or familiars. Tribal peoples around the world often contact their ancestors. Perhaps a relative who has passed on who you never knew or who you want to rekindle a relationship with would be a better idea. Alternatively maybe look into mythic figures or god forms relavent to your culture - even if you do not actively practice your culture. But if you are German or Scandanavian, even Russian then Norse mythology might be a good place. And respectively if you're Celtic, Asian or native American etc etc.
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