IT IS A DIFFERENT JOHN WHO, WHILE HE'S THE SAME AGE AS JOHN WINCHESTER, IS NOT RELATED TO DEAN IN ANY WAY, SHAPE, OR FORM.

Because, yeah, the pairing label sounds all kinds of wrong. The sex is hot, though. And it's kind of fun to watch Dean and JOhn (Constantine) try to one-up each other, a game which Dean is, alas, doomed to lose. Age and (sexy) treachery will defeat youth and beauty any time.