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Djinn are not Incubi and hold little similarities. Whoever told you this is not familiar with these class of spirits.
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DO NOT invoke a djinn, especially if you have little to no relationship with them because they will take advantage and will be more inclined to do more harm then good (especially if they were entrapped in a object under not so good circumstances).
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If you want a solid relationship with the djinn in the ring I would unbind him from the object. If the binding was consented it would have been a mutual agreement between those two parties. Due to the fact that the djinn was bound to the item from a different individual, it wouldn’t be right for them to stay bound because it isn’t something that is taken lightly with these class of spirits and it takes complete trust for most of them to agree to it. However, if you do want to get to the point where you would like to consensually rebind the djinn in the future I would highly encourage it and I think that you doing it on your own terms with the djinn is more personal and meaningful.
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If you decide to take this course of action you will probably gain a lot of respect and they will probably stick around. However, under the circumstance that they were forcefully bound I would take protective measures just in case because they might have a lot of pent up aggression due to their view of being used and not having any sense of control over their life.
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If you do end up freeing the djinn from the ring and want to establish a strong relationship with them, there are many things that they do enjoy when it comes to offerings. They love wine, red meat, tobacco, hot spices, and blood. They also tend to have a soft spot for music but you would have to ask them for their preferences (from my experience, a lot of them love various forms of folk music). They also love dancing but they tend to like to convey that in dreams.
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You can communicate with your djinn in a few different ways. You can perform etheric or astral projection allowing you to interact with them just as vividly as you would if they had a human vessel on the physical plane (if you are fairly new to projection you will have to work on your senses to get to that point). You also have lucid dreaming where they can appear to you in your dreams and can interact with you that way. You can also interact with them through opening your chakras (especially the third eye). This method isn’t as vivid from a visual standpoint but touch and audio can be reached with practice.
Anyway, sorry for the long post. I hope it was insightful.
Note: You can offer food and they can consume the energy from it! While it visibly might not look eaten there are usually minor changes within the food or beverage. There have been times with drinks where it became completely flat when it had much more time to get to that point normally.