RE: Deer adopted me!
That would be a rather cool experience. I wouldn't do anything with him and just tell the neighbors that you have a tame wild deer (Oxymoron). If the day came that he became too aggressive that might be a different story. I would have to get a decoy and see what interaction he had with it. That would be interesting. I would just cherish the relationship for the time being and cross that bridge if or when the time comes that you need him to move on.