Honestly I do not find it abnormal. It is a fantasy. I think it is more of a being in control aspect than anything else. Maybe you feel inferior in daily life and this fantasy gives you the control that you desire in reality. Just because it is a fantasy does not mean you will act it out in reality. I personally have similar fantasies that I would never act on in reality because of the nature of the fantasy. It doesn't make you a pedo or a deviant to fantasize about these things. I only see it as a problem if you took it out of the fantasy realm and into reality. Then I think that it would be something that you should worry about.