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The Giantesses had created a society based on foot worship and foot feeding, with male slaves spending most of their time attending their owners' feet.

They are highly matriarchal and they reject any female from another race as they only need males for copulating.

As stated before, there is a measurement for the capability of a female regarding feet characteristics.

That is the GPN, the Genetic Potential Number, which increases with each successful breeding with a man.

The resulting number of the offspring resulting from a cross-breeding between a man and a giantess, depends of the GPN of their parents, which is defined by a simple mathematic equation.

Knowing that GN accounts for "Giantess Number" and HN for "Human Number", the resulting equation would look like this:

GPN = GN + HN + 1

This way, a couple formed by a giantess and a man with none of their ancestors mixing with the other one's race, with both of them GPN = 0, would give birth to individuals, male or female, with GPN = 1.

If their offspring reproduced between them, which would be forbidden since in the Giantesses' society there must be a kinship grade higher than six (Less related than second cousins), their children would be GPN = 3.

If we continued this illegal process the resulting number would be: 7, 15, 31, 63, 127, 255... And so on.