Delete the facebook post, and stop doing anything of this nature. Let your cousin figure things out for himself. Good luck.
You could be charged with a crime; however I would find it highly unlikely. Although, do not post any other information about the contact online and should you be charged, contact a local criminal defense attorney ASAP. In the future you should not have any contact with a minor that could be misconstrued or get you into trouble. It is probably best to not contact them on Facebook at all. Good luck!
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Yes, see my comment.
I am trying to give you a general answer to your question. We do not have an attorney-client relationship by this response on the avvo website. I have not been retained to represent you. I am licensed to practice law in Kentucky and in federal court in this state and the Southern District of Indiana. You need to seek legal advice from an attorney licensed to practice in your area..