This will sometimes be a verbal covenant, but will often be a blood covenant where a communion made of blood, urine and alcohol will be taken. The demon will destroy him if he disobeys those in authority or tells on the group. He may be told that members of his family will die if he breaks his covenants. He will probably take part in animal sacrifices and may eventually participate in the killing of a human, usually a member of the group. Satanism is visible and available.
Some kids use it to get back at their parents.
Their friends are into it, so they go along. Satanism is self-gratification and unlimited freedom. For example, a recruiter might suggest using an incantation to help a student get a good grade on a math test. He thinks it works. Next time he might be asked to go to a cemetery.