Demonic Possession - Ritual to Possess Someone by a Demon

MAKE A DEMON CHASE YOUR TARGET. 

Hi again, my beloved people: here's a ritual that won't go unnoticed by any of you: a demonic possession. 

This is a very, very, very severe ritual. Not like any other before. This spell is meant for an evil punishment for someone as it will mentally torture your target;  the person you wish to be the victim of this ritual will go through all kinds of psychological problems, such as paranoia, isolation, depression, and so much more. Trust me, this is the worst torture you can make someone experience, so make sure your target deserves this, is evil or has hurt you deeply. Depending on the person, I'll choose one demon or another in order to make the most accurate ritual for your situation. If we're treating with a very evil person, I recommend you to repeat this ritual as times as necessary.

You can also suggest me how do you want the possession to work; what kind of punishment you want your target to go through. It's up to you.

And overall; THINK THIS THROUGH. Magic is serious, TAKE THIS AS WHAT IT IS. It's up to you... and once it's done, there's no going back. 

Let it happen.