Stories are nice but I really hope you can do better than post Dingle and talk about inverted partial derivitives.

To get back to the issue of inherent reciprocity in Special Relativity you might try reading here:

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http://www.mathpages.com/home/kmath307/kmath307.htm

This principle is usually extended to include reciprocity, meaning that for any two systems S1 and S2 of inertial coordinates, if the spatial origin of S1 has velocity v with respect to S2, then the spatial origin of S2 has velocity -v with respect to S1. The existence of this class of reference frames, and the viability of the principles of relativity and reciprocity, are inferred from experience. Once these principles have been established, the relationship between relatively moving inertial coordinate systems can then be considered.
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I'll merely note that yo have not answered the question of how YOU have determined which frame will undergo time dilation or length contraction. Are you going to do that or are you going to continue to ignore the question?