Can girl next door be consider a fetish?

It's all role play fantasy with taboo subjects.

Of course if you show me a picture of the girl next door I could tell you better.

8o)

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Absolutely, Girl Next Door can be a sexual fetish if is something (role play) that needs to be present to get the other person aroused.  I think this would fall into the Mary Ann from "Gilligan's Island" paradigm.

Girl Next Door is not really a kink or perversion because it is such a common interest among men.  By definition, a kink or perversion is outside the norm.  For that matter, spanking probably isn't a kink or perversion anymore, because so many people do it now.