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Montana Wildhack is a hot 20-year-old porn star/actress whom the Tralfamadorians pair Billy with in their zoo. After a gentlemanly week of waiting, Billy has sex with her and the two conceive a baby.
While Billy is in New York trying to tell the world about time and Tralfamadore, he imagines Montana back in the zoo nursing their six-month-old baby. Montana appears to be a complete fantasy for Billy, a totally understanding and attractive woman who is totally okay with a no-strings-attached kind of relationship.